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Worksheets

CCHS Integrated Final Exam Fall 2021

Total questions: 221

Worksheet time: 3hrs 53mins

Name
Class
Date
1.

Jack tries to place magnets on the door of his refrigerator. He observes that the magnets don’t stick. He guesses that the door of the refrigerator is made of a nonmagnetic substance. What stage of scientific investigation does his guess represent?

a)

A. ask questions

b)

B. construct a hypothesis

c)

C. explain the results

d)

D. make observations

2.

Meg goes swimming on a hot afternoon. When she comes out of the pool, her foot senses that the pavement is unbearably hot. Suppose Meg wants to apply the scientific method to discover reasons for the hot pavement. What is the next step she should take?

a)

A. analyze the data

b)

B. ask questions

c)

C. communicate the results

d)

D. make observations

3.

When a candle burns, which forms of energy does the chemical energy in the candle change to?

a)

A. light and sound

b)

B. heat and sound

c)

C. light and heat

d)

D. electric and light

4.

Based on the law of conservation of energy, which statement is correct?

a)

A. Energy is always being added to all parts of the Universe.

b)

B. Energy is often destroyed in some parts of the Universe.

c)

C. Energy in a closed system cannot change forms.

d)

D. Energy in an isolated system remains constant.

5.

When a hypothesis is proven wrong, scientists often begin by revising the (a)   (question, hypothesis,

experiment, conclusion).

6.

After a hypothesis is proven wrong, scientists often begin by revising the hypothesis, it’s common for scientists to redesign the (a)   (question, hypothesis, experiment, conclusion).

7.

Classify the items based on whether they are or are not matter. Check all the examples of matter.

a)

toothpaste

b)

light

c)

gasoline

d)

cell

e)

sound

8.

Select the forms of energy in the image.

a)

glass

b)

heat

c)

light

d)

tungsten

e)

electricity

9.

Select the volume units that are greater than one liter.

a)

kiloliter

b)

milliliter

c)

megaliter

d)

centiliter

e)

nanoliter

10.

Identify the type of energy conversion represented by each picture.

a)

wind energy to electric energy

b)

electric energy to heat energy

c)

solar energy to light energy

d)

electric energy to light energy

11.

Identify the type of energy conversion represented by each picture.

a)

wind energy to electric energy

b)

electric energy to heat energy

c)

solar energy to light energy

d)

electric energy to light energy

12.

Identify the type of energy conversion represented by each picture.

a)

wind energy to electric energy

b)

electric energy to heat energy

c)

solar energy to light energy

d)

electric energy to light energy

13.

Identify the type of energy conversion represented by each picture.

a)

wind energy to electric energy

b)

electric energy to heat energy

c)

solar energy to light energy

d)

electric energy to light energy

14.

Match the sentences with the steps of the scientific method.


State a hypothesis.

a)

An indoor plant in a dark room withers faster than the same

plant in a room with ample sunlight.

b)

The plant in the pot with black paper withered.

The other plant was healthy.

c)

Sunlight is probably essential for plants to grow and live.

d)

Plants need sunlight to make food so they can live.

15.

Match the sentences with the steps of the scientific method.


Make an observation.

a)

An indoor plant in a dark room withers faster than the same

plant in a room with ample sunlight.

b)

The plant in the pot with black paper withered.

The other plant was healthy.

c)

Sunlight is probably essential for plants to grow and live.

d)

Plants need sunlight to make food so they can live.

16.

Match the sentences with the steps of the scientific method.


Analyze the results.

a)

An indoor plant in a dark room withers faster than the same

plant in a room with ample sunlight.

b)

The plant in the pot with black paper withered.

The other plant was healthy.

c)

Sunlight is probably essential for plants to grow and live.

d)

Plants need sunlight to make food so they can live.

17.

Match the sentences with the steps of the scientific method.


Communicate the results to others.

a)

An indoor plant in a dark room withers faster than the same

plant in a room with ample sunlight.

b)

The plant in the pot with black paper withered.

The other plant was healthy.

c)

Sunlight is probably essential for plants to grow and live.

d)

Plants need sunlight to make food so they can live.

18.

What two activities are basic to most of science?

a)

Getting good grades and asking questions.

b)

Paying attention in class and memorizing

c)

Observing the world and asking questions

d)

Observing science and reading answers

19.

Science starts with gathering ________________________ about the natural world.

a)

hypothesis

b)

Answers

c)

Experiments

d)

Knowledge

20.

The stuff that everything is made of is:

a)

Earth

b)

wind

c)

Water

d)

Matter

21.

The ability to do work is called:

a)

Power

b)

energy

c)

force

d)

training

22.

Moving objects have energy of:

a)

motion

b)

Chemical

c)

Stored

d)

mechanical

23.

SI units to measure volume are:

a)

Cups and quarts.

b)

Gallons

c)

Liters and cubic meter

d)

Kilograms and pounds

24.

How many mL are in 3.5 KL?

a)

0.0035 mL

b)

3,500 mL

c)

35,000 mL

d)

3,500,000 mL

25.

Convert 70 ounces (Oz) to kilograms

a)

4.375 Kg

b)

31.76 Kg

c)

1.985 Kg

d)

1120 Kg

26.

Convert 6000 mL to qt

a)

6 qt

b)

6.34 qt

c)

5,676,000 qt

d)

none

27.

William finds a piece of pure iron in his garden. After a few days, the iron begins to rust. What are the two types of substances involved in the rusting process of iron?

Iron is a/an (a)   (compound, element, mixture)

with one kind of atom that combines with oxygen from the air to form rust (iron oxide).

28.

Rust contains two types of atoms, which means it is a (a)   . (compound, an element, a mixture)

29.

Type the correct answer in the box. Use numerals instead of words.


Frank has a sample of steel that weighs 80 grams. If the density of his sample of steel is 8 g/cm3, what is the sample’s volume?

The sample’s volume is (a)   cm3.

30.

Mathew has a filtration kit, which consists of a funnel, a flask, and filter papers. Which of these mixtures can he separate using filtration?

a)
b)
c)
d)
31.

Check all the sentences based on whether they describe the properties of a heterogeneous mixture.

a)

Its components are visible.

b)

It may be mistaken for a pure substance.

c)

It can be separated using distillation.

d)

Concrete is an example of this kind of mixture.

32.

Which unit is commonly used to measure density?

a)

A. gcm3

b)

B. g/cm3

c)

C. cm3/g

d)

D. g/cm

33.

An alloy is made up of two kinds of metals. This alloy is uniform in appearance. How would this material be classified?

a)

A. substance

b)

B. homogeneous mixture

c)

C. heterogeneous mixture

d)

D. compound

34.

An electric iron is used to remove wrinkles from clothing. The electric iron is made of metal. Which property of this substance is most useful for this application?

a)

A. boiling point

b)

B. density

c)

C. electrical conductivity

d)

D. thermal conductivity

35.

What is a substance?

a)

A. a uniform mixture that can’t be separated

b)

B. a mixture that can be separated

c)

C. a single component that can’t be separated

d)

D. a single component that can be separated

36.

Daniel has a sample of pure copper. Its mass is 89.6 grams (g), and its volume is 10 cubic centimeters (cm3). What’s the density of the sample?

a)

A. 0.11 g/cm3

b)

B. 8.96 g/cm3

c)

C. 11.1 g/cm3

d)

D. 896 g/cm3

37.

Erica is working in the lab. She wants to remove the fine dust particles suspended in a sample of oil. Which method is she most likely to use?

a)

A. reverse osmosis

b)

B. osmosis

c)

C. filtration

d)

D. dilution

38.

Which of the following property does not describe a compound:

a)

it is composed of two or more elements

b)

it is a pure substance

c)

constituents cannot be separated by physical means

d)

mixed in any proportion by mass

39.

Suspension can be separated by filtration.

a)

TRUE

b)

FALSE

40.

Solution is a (a)   mixture.

(homogenous, hetergenous, compound)

41.

The mass of an atom is found by adding its protons and _____________.

a)

electrons

b)

neutrons

c)

nucleus

42.

The electric charge of an atom is found by adding the charges carried by its protons and ___________.

a)

nucleus

b)

neutrons

c)

electrons

43.

Type the correct answer in each box.

The mass number of iodine is 126, and it’s in the 53rd place in the periodic table. It has __________protons and __________neutrons.

a)

53, 73

b)

73, 53

c)

126, 53

44.

Identify the elements that appear before iron (Fe) in the periodic table.

a)

Ni

b)

Mn

c)

Co

d)

Cu

e)

K

45.

Mercury is in the 80th position in the periodic table. How many protons does it have?

a)

A. 8

b)

B. 40

c)

C. 80

d)

D. 160

46.

Mr. Adams asked his students to write the chemical symbol for the element zinc. He wrote the students’ answers on the whiteboard. Which answer is correct?

a)

A. zn

b)

B. Zn

c)

C. ZN

d)

D. zN

47.

Sodium (Na) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence electrons does potassium have?

a)

A. 0

b)

B. 1

c)

D. 11

d)

C. 9

48.

The atomic number of krypton (Kr) is 36, and its mass number is 84. How many neutrons does it have?

a)

A. 18

b)

B. 36

c)

C. 48

d)

D. 72

49.
An example of matter made of only one element is
a)
water
b)
gold bar
c)
light bulb
d)
salad mixture
50.

What does the subscript in a chemical formula tell you?

a)

How many molecules are present

b)

How many atoms are present

c)

How many elements are present

d)

How many neutrons are present

51.

a positively charged subatomic particle found in the nucleus of every atom

a)

atom

b)

proton

c)

neutron

d)

electron

52.

a subatomic particle that has about the same mass as a proton but does not have an electric charge

a)

proton

b)

neutron

c)

electron

d)

atomic number

53.

the number of protons in an atom’s nucleus

a)

proton

b)

neutron

c)

electron

d)

atomic number

54.

an abbreviation for an element

a)

electric charge

b)

atomic number

c)

atomic weight

d)

chemical symbol

55.

an electron in the outermost energy level of an atom

a)

atomic number

b)

compound

c)

valence electron

d)

chemical symbol

56.

a substance that conducts heat and electricity, tends to be shiny, and is used in many industrial applications

a)

metal

b)

nonmetal

c)

metalloid

d)

compound

57.

an element that in its solid state has properties of both metals and nonmetals

a)

Metal

b)

Metalloid

c)

Nonmetal

d)

Compound

58.

an element that in its solid state is brittle, dull, and a poor conductor of heat and electricity

a)

Metal

b)

Nonmetal

c)

Metalloid

d)

Compound

59.

a group of reactive nonmetal elements found in column 17 of the periodic table

a)

Main group

b)

Noble gases

c)

halogen

d)

alkali metal

60.

a group of nonreactive nonmetal elements found in column 18 of the periodic table

a)

Halogen

b)

alkali metals

c)

Main group

d)

Noble gases

61.

Select the Noble Gas

a)

He

b)

P

c)

Be

d)

Li

62.
Sodium is an ingredient in salt.  The chemical symbol for salt is
a)
N
b)

NaCl

c)
Mg
d)
S
63.

Why does a solid change to liquid when heat is added?

a)

A. The spacing between particles decreases.

b)

B. Particles lose energy.

c)

C. The spacing between particles increases.

d)

D. The temperature decreases.

64.

Why does ice float on water?

a)

A. The temperature of ice is lower than the temperature of water.

b)

B. The temperature of water and ice are the same.

c)

C. The density of ice is less than the density of water.

d)

D. The density of ice is greater than the density of water.

65.

When a perfume bottle is opened, some liquid changes to gas and the fragrance spreads around the room. Which sentence explains this?

a)

A. Gases do not have a definite volume.

b)

B. The particles of gases are closely packed.

c)

C. The force of attraction between particles in gases is very high.

d)

D. Gases are not matter.

66.

An iron nail is made up of particles. What is true about the particles?

a)

A. They move all over the place.

b)

B. The force of attraction between them is small.

c)

C. The spacing between them is large.

d)

D. They stay in place and vibrate.

67.

Select the correct answer from each drop-down menu.


When a liquid is cooled, the kinetic energy of the particles __________________ , and the matter changes its state to solid.

a)

decreases

b)

increases

c)

remains the same

68.

Select the correct answer from each drop-down menu.


When a liquid is cooled, the force of attraction between the particles ________________ , and the matter changes its state to solid.

a)

decreases

b)

increases

c)

remains the same

69.

Select the correct answer from each drop-down menu.


When a liquid is cooled, the space between the particles ______________.

, and the matter changes its state to solid.

a)

decreases

b)

increases

c)

remains the same

70.
Molecules have energy and _________ stop moving
a)
rarely
b)
always
c)
never
d)
sometimes
71.
Matter changes state when...
a)
energy is added or removed
b)
energy is added
c)
energy is removed
d)
there is no energy
72.
As molecules gain energy, they move _____ and spread apart, and vise versa.
a)
faster
b)
slower
c)
less
d)
inside
73.
Energy(heat) is added in order to go from ...
a)
solid to gas
b)
liquid to solid
c)
gas to liquid
d)
gas to solid
74.
Energy(heat) is removed in order to go from ....
a)
gas to solid
b)
solid to liquid
c)
solid to gas
d)
liquid to gas
75.
Matter will change state when enough energy (heat) is added to , or removed from, the molecules. 
a)
true
b)
false
76.
If you want to change liquid water into a gas you must:
a)
remove heat from the water
b)
apply pressure to the water
c)
add heat to the water
d)
add chemicals to the water
77.
What happens to a substance when it changes from a liquid to a solid?
a)
it gains mass
b)
it gains energy
c)
it loses mass
d)
it loses energy
78.

A phase change from liquid to gas is called ...

a)

condensation

b)

evaporation

c)

sublimation

d)

deposition

79.
When a gas forms directly into a solid, skipping the liquid phase
a)
deposition
b)
sublimation
c)
evaporation
d)
condensation
80.
Sublimation is
a)
when solid turns into gas
b)
when gas turns into plasma
c)
when liquid turns into gas
d)
when gas turns into solid
81.
What is the opposite of melting?
a)
condensation
b)
evaporization
c)
freezing
d)
sublimation
82.
Which is needed for both boiling and melting to occur?
a)
solids
b)
gases
c)
heat
d)
pressure
83.
 The process where water vapor changes from a gas to a liquid is called:
a)
sublimation
b)
precipitation
c)
evaporation
d)
condensation
84.

Is the substance gaining or losing energy?

a)

Gaining

b)

Losing

85.

Are the particles moving faster or slower as time goes on?

a)

Faster

b)

Slower

86.

What state/phase is the object likely from points A to B?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

87.

What is happening to the particles in the substance between points A and B?

a)

Melting

b)

Freezing

c)

Speeding Up

d)

Slowing Down

88.

What is happening to the particles in the substance between points D and E?

a)

Melting

b)

Freezing

c)

Vaporizing

d)

Sublimating

89.

Is the substance gaining or losing energy?

a)

Gaining

b)

Losing

90.

Where on the graph are phase changes taking place?

a)

1

b)

2

c)

3

d)

4

e)

5

91.

Identify the arrows that show removal of thermal energy when matter changes state.

a)

Arrows to the left

b)

Arrows to the right

92.

Some fuel cells are powered by hydrogen. Scientists are looking into the decomposition of water (H2O) to make hydrogen fuel with the help of the Sun’s energy.

What challenge do scientists face with this task?

a)

Decomposing water requires a high activation energy.

b)

The Sun isn't a renewable resource.

c)

Decomposing water results in toxic byproducts.

d)

Scientists are uncertain what to do with the excess oxygen.

93.

Which chemical reaction shows photosynthesis?

a)

water + carbon dioxide + sunlight → oxygen + glucose

b)

carbon + oxygen → carbon dioxide

c)

hydrogen + oxygen → water

d)

nitrogen + hydrogen → ammonia

94.

Which of these reactions is a combustion reaction?

a)

burning wood

b)

decomposition of water

c)

production of food by plants with the help of the Sun's energy

d)

rotting of fruits and vegetables

95.

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells?

a)

Burning fossil fuels pollutes the environment.

b)

Burning fossil fuels takes place inside expensive fuel cells.

c)

Fossil fuels aren’t widely available, but pure hydrogen is.

d)

Fossil fuels are nonrenewable.

96.

In a given chemical reaction, the energy of the products is less than the energy of the reactants. Which statement is true for this chemical reaction?

a)

Energy is absorbed in the reaction.

b)

Energy is released in the reaction.

c)

There is no transfer of energy in the reaction.

d)

Energy is lost in the reaction.

97.

A hydrogen fuel cell is more efficient than a combustion reaction because very little of the released energy is released as ______?

a)

heat

b)

electrical energy

c)

chemical energy

98.

When used at home, a fuel cell eliminates the need for _________ because the cell is portable.

a)

oxygen

b)

hydrogen

c)

an electrical grid

99.

In a chemical reaction, activation energy increases __________ of the reactants.

a)

the amount of chemical energy

b)

number of particles

c)

the temperature

100.

Increasing activation energy causes the particles to collide, which results in the _____________ of new products.

a)

breaking up

b)

formation reaction

101.

Which chemical reactions are based on whether they absorb energy.

a)

respiration in cells

b)

photsynthesis

c)

burning a candle

d)

baking bread

e)

activating a cold pack

102.

Which chemical reactions are based on whether they release energy.

a)

respiration in cells

b)

producing electric current

c)

burning a candle

d)

baking bread

e)

activating a cold pack

103.

Arrange the characteristics of the reaction in order from start to finish.

a)

1. lower energy of reactants

2. transition state

3. higher energy of products

b)

1. lower energy of reactants

2. higher energy of products

3. transition state

c)

1. higher energy of reactants

2. lower energy of products

3. transition state

d)

1. higher energy of products

2. transition state

3. lower energy of reactants

104.

Identify the parts of the energy diagrams.

Part A.

a)

energy released

b)

energy absorbed

c)

reactants

d)

products

105.

Identify the parts of the energy diagrams.

Part B.

a)

energy released

b)

energy absorbed

c)

reactants

d)

products

106.

Identify the parts of the energy diagrams.

PartC.

a)

energy released

b)

energy absorbed

c)

reactants

d)

products

107.

Identify the parts of the energy diagrams.

PartC.

a)

energy released

b)

energy absorbed

c)

reactants

d)

products

108.

Identify the parts of the energy diagrams.

Part B..

a)

energy released

b)

energy absorbed

c)

reactants

d)

products

109.

Scientists are looking into the decomposition of water (H2O --> H2 + H2O) to make hydrogen fuel with the help of the Sun’s energy. What challenge do scientists face with this task?

a)

Decomposing water requires a high activation energy.

b)

The Sun isn't a renewable resource.

c)

Decomposing water results in toxic byproducts.

110.

Endothermic reactions ______.

a)

release more energy than they absorb

b)

absorb more energy than they release

c)

release and absorb exactly the same amount of energy

d)

can either release more energy than they absorb or absorb more energy than

they release, depending on the reaction

111.

Energy is _________ when bonds form.

a)

released

b)

absorbed

c)

destroyed

d)

created

112.

Energy is _________ when bonds break.

a)

absorbed

b)

created

c)

destoryed

d)

released

113.

Energy is needed to break bonds in chemical reactions.

a)

True

b)

False

114.

A chemical reaction in which more energy is absorbed than is released is endothermic

a)

True

b)

False

115.

Temperature usually _____ in EXOthermic reactions.

a)

Stays the same

b)

Increases

c)

Decreases

116.

Photosynthesis is an _____ reaction.

a)

EXOthermic

b)

ENDOthermic

117.
What type of reaction is this?
a)
Endothermic
b)
Exothermic
118.

Which letter corresponds to the activation energy?

a)

A

b)

B

c)

C

d)

D

119.

The chemical formula for sulfuric acid is H2SO4.

In 2H2SO4, the number of hydrogen atoms is_____?

a)

1

b)

2

c)

4

d)

8

120.

The chemical formula for sulfuric acid is H2SO4.

In 2H2SO4, the number of sulfur atoms is ___?

a)

1

b)

2

c)

4

d)

8

121.

The chemical formula for sulfuric acid is H2SO4.

In 2H2SO4, the number of oxygen atoms is _____?

a)

1

b)

2

c)

4

d)

8

122.

When sodium reacts with chlorine, sodium chloride is produced.

Andrew represented this reaction with this equation:

Na + Cl2 → 2NaCl

The equation is _____________.

a)

balanced

b)

not balanced

123.

When sodium reacts with chlorine, sodium chloride is produced. Andrew represented this reaction with this equation:

__Na + __Cl2 →__NaCl

Which set balances the equation?

a)

1,1,1

b)

1,2,1

c)

1,1,2

d)

2,1,2

124.

When butane burns in oxygen, it produces carbon dioxide and water. This reaction is represented in this equation:

2C4H10 + 13O2 → 8CO2 + 10H2O

How many atoms of carbon (C) on each side of the equation?

a)

2

b)

4

c)

6

d)

8

125.

When butane burns in oxygen, it produces carbon dioxide and water. This reaction is represented in this equation:

2C4H10 + 13O2 → 8CO2 + 10H2O

How many atoms of oxygen (O) on each side of the equation?

a)

2

b)

13

c)

15

d)

26

126.

When butane burns in oxygen, it produces carbon dioxide and water. This reaction is represented in this equation:

2C4H10 + 13O2 → 8CO2 + 10H2O

How many atoms of hydrogen (H) on each side of the equation?

a)

10

b)

12

c)

20

d)

26

127.

Iron reacts with oxygen to produce iron oxide (rust). This reaction is represented in an equation as 4Fe + xO2 → 2Fe2O3.

Identify the value of x that will balance the equation.

a)

1

b)

2

c)

3

d)

4

128.

The chemical formula for artificial sweetener is C7H5NO3S.

Match the elements with the numbers found in one molecule of artificial sweetener.

carbon

a)

1

b)

3

c)

5

d)

7

e)

No Answer

129.

The chemical formula for artificial sweetener is C7H5NO3S.

Match the elements with the numbers found in one molecule of artificial sweetener.

hydrogen

a)

1

b)

3

c)

5

d)

7

e)

No Answer

130.

The chemical formula for artificial sweetener is C7H5NO3S.

Match the elements with the numbers found in one molecule of artificial sweetener.

sulfur

a)

1

b)

3

c)

5

d)

7

e)

No Answer

131.

The chemical formula for artificial sweetener is C7H5NO3S.

Match the elements with the numbers found in one molecule of artificial sweetener.

Oxygen

a)

1

b)

3

c)

5

d)

7

e)

No Answer

132.

Which chemical equations are being balanced ?

a)

CaO + 3C → CaC2 + CO

b)

Na + H2O → 2NaOH + H2

c)

4Fe + O2 → 2Fe2O3

d)

2Mg + O2 → 2MgO

133.

Calcium carbonate is a compound that is used to make chalk for drawing on rocks or pavement. One molecule has one atom of calcium (Ca), one atom of carbon (C), and three atoms of oxygen (O). Which is the correct way to write the chemical formula for calcium carbonate?

a)

3CaCO

b)

Ca3CO

c)

CaCO3

d)

Ca3C3O3

134.

The picture represents sulfur trioxide.

Which statement is true for one molecule of sulfur trioxide?

a)

There are three atoms of sulfur and one atom of oxygen.

b)

There are three atoms of sulfur and three atoms of oxygen.

c)

There is one atom of sulfur and one atom of oxygen.

d)

There is one atom of sulfur and three atoms of oxygen.

135.

If blue represents one atom of nitrogen, and   red represents one atom of oxygen, which picture represents 2NO2?

a)
b)
c)
d)
136.

Sodium bicarbonate is the chemical name for baking soda. Its chemical formula is NaHCO3. What does the subscript 3 mean?

a)

There are three molecules of sodium bicarbonate.

b)

There are three molecules of oxygen in sodium bicarbonate.

c)

There are three atoms of oxygen in sodium bicarbonate.

d)

There are three atoms of sodium bicarbonate.

137.

Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears. Samuel takes a sip to discover that the water tastes salty. What kind of change has occurred?

a)

It’s a chemical reaction because a new substance has formed.

b)

It’s a physical change because the water and the salt kept their original properties.

c)

It’s an example of synthesis because two substances reacted to give one substance.

d)

It’s a chemical reaction because the water now tastes salty but originally did not.

138.

Carbon burns in the presence of oxygen to give carbon dioxide. Which chemical equation describes this reaction?

a)

carbon + oxygen + carbon dioxide

b)

carbon + oxygen → carbon dioxide

c)

carbon dioxide → carbon + oxygen

d)

carbon dioxide + carbon → oxygen

139.

Iron oxide reacts with aluminum to give aluminum oxide and iron. What kind of chemical reaction is this?

a)

combustion

b)

decomposition

c)

synthesis

d)

replacement

140.

What kind of chemical reaction does the chemical equation sodium + chlorine → sodium chloride represent?

a)

combustion

b)

decomposition

c)

single replacement

d)

synthesis

141.

In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a (a)   (combustion,

decomposition, replacement, synthesis) reaction.

142.

Water breaks down into hydrogen and oxygen.

a)

neutralization

b)

combustion

c)

synthesis

d)

decomposition

143.

Leaves make starch using chlorophyll and carbon dioxide.

a)

neutralization

b)

combustion

c)

synthesis

d)

decomposition

144.

Food burns in oxygen gas and releases a lot of energy.

a)

neutralization

b)

combustion

c)

synthesis

d)

decomposition

145.

Adding vinegar (acid) to baking soda (alkali) give sa product that is neither acidic nor alkaline.

a)

neutralization

b)

combustion

c)

synthesis

d)

decomposition

146.

Not all tiles will be used. Match the reactants with the products.

copper + oxygen →\rightarrow  

a)

aluminum chloride + copper

b)

zinc sulfate + copper

c)

copper oxide

d)

copper sulfate + oxygen

e)

copper + water

147.

Not all tiles will be used. Match the reactants with the products.

aluminum + copper chloride →\rightarrow  

a)

aluminum chloride + copper

b)

zinc sulfate + copper

c)

copper oxide

d)

copper sulfate + oxygen

e)

copper + water

148.

Not all tiles will be used. Match the reactants with the products.

copper oxide + hydrogen →\rightarrow  

a)

aluminum chloride + copper

b)

zinc sulfate + copper

c)

copper oxide

d)

copper sulfate + oxygen

e)

copper + water

149.

Not all tiles will be used. Match the reactants with the products.

copper sulfate + zinc →\rightarrow  

a)

aluminum chloride + copper

b)

zinc sulfate + copper

c)

copper oxide

d)

copper sulfate + oxygen

e)

copper + water

150.

Identify the following process: We light a matchstick.

a)

Physical change

b)

Chemical change

151.

What type of changes the appearance change but the substance is the same.

a)

Physical

b)

Chemical

152.

Identify the following process: The food and the air react.

a)

Physical change

b)

Chemical change

153.

The initial substances before occurring the chemical reaction are called...

a)

Reactants

b)

Products

154.

The new substances after occurring the chemical reaction are called...

a)

Reactants

b)

Products

155.

What is the speed of this chemical reaction (rusting)

a)

SLOW

b)

FAST

156.
What is the speed of this chemical reaction
a)
SLOW
b)
FAST
157.
What is this ?
a)
a chemical reaction
b)
a mathematical equation
c)
a chemical equation
158.
What is this ?
a)
a chemical reaction
b)
a mathematical equation
c)
a chemical equation
159.

The mass conservation law says

a)

During a chemical reaction, atoms are destroyed. The number of atoms don't remains constant throughout the reaction.

b)

During a chemical reaction, atoms are created. The number of atoms remains constant throughout the reaction.

c)

During a chemical reaction, atoms are neither created nor destroyed. The number of atoms remains constant throughout the reaction.

160.

In the chemical compound C2H2, how many pairs of electrons are shared between the two carbon atoms?

a)

one pair of electrons

b)

two pairs of electrons

c)

three pairs of electrons

161.

A hydrocarbon of pentane has two isomeric forms—n-pentane and iso-pentane. The molecular formula of the n-pentane is C5H12. Predict the molecular formula of the iso-pentane.

a)

C5H10

b)

C5H12

c)

C5H9

162.

Both coal and diamonds are forms of elemental carbon. Coal is brittle while diamonds are considered to be the hardest of all substances known. What is the appropriate justification for this?

a)

Both coal and diamonds are allotropes of carbon, having different structures due to different arrangements of carbon atoms.

b)

Both coal and diamonds are isomers of each other, having a similar molecular formula but different structures.

c)

Coal is ionically bonded together while diamonds are covalently bonded together.

163.

How many valence electrons does a carbon atom have?

a)

two

b)

four

c)

six

164.

The graphic shows two isomers of a chemical compound with molecular formula C5H11NO2. Which type of isomers are these?

a)

structural isomers

b)

geometric isomers

c)

halotropic isomers

165.

A hydrocarbon consists of four carbon atoms with one double bond. Predict the molecular formula of this compound.

a)

C4H8

b)

C4H10

c)

C4H4

d)

C4H6

166.

Butene has two isomers—one with methyl groups on the same side of the double bond and the other with methyl groups on the opposite side. What kind of isomers are these?

a)

structural isomers

b)

geometric isomers

c)

halotropic isomers

167.

Predict the chemical formula of butyne, having one carbon-carbon triple bond.

a)

C4H8

b)

C4H10

c)

C4H6

168.

A molecule of alkene has the chemical formula C3H4. How many carbon-carbon double bonds are present in the molecule?

a)

one

b)

two

c)

three

169.

How does the carbon atom complete its octet?

a)

It forms ionic bonds by sharing electrons.

b)

It forms covalent bonds by donating electrons.

c)

It forms covalent bonds by sharing electrons.

170.
Hydrocarbons are compounds that contain
a)
  Carbon and Nitrogen
b)
Carbon and Hydrogen 
c)
  Carbon, and Oxygen
d)
Carbon, Oxygen, and  Hydrogen 
171.
Which of the following compounds is an example of hydrocarbon?
a)
CO2
b)
C2H6
c)
C2H5OH
d)
CH3COOH
172.
Name this alkane
a)
Methane
b)
Ethane
c)
Propane
d)
Butane
173.
Name this alkane
a)
Methane
b)
Ethane
c)
Propane
d)
Butane
174.
If an alkane has 20 carbon atoms, how many hydrogen atoms will it have?
a)
20
b)
22
c)
40
d)
42
175.

How many chemical bonds can each carbon atom form?

a)

1

b)

2

c)

3

d)

4

176.
Which biomolecule is this a picture of?
a)
Protein
b)
Nucleic Acid
c)
Lipid
d)
Carbohydrate
177.
Which biomolecule is this a picture of?
a)
Protein
b)
Nucleic Acid
c)
Lipid
d)
Carbohydrate
178.
Which biomolecule is this a picture of?
a)
Protein
b)
Nucleic Acid
c)
Lipid
d)
Carbohydrate
179.
Which biomolecule is this a picture of?
a)
Protein
b)
Nucleic Acid
c)
Lipid
d)
Carbohydrate
180.
Which biomolecule is made of nucleotides and contain you DNA?
a)
Carbohydrate
b)
Lipids
c)
Protein
d)
Nucleic Acid
181.

Which biomolecule helps form muscles?

a)

Nucleic Acid

b)

Carbohydrate

c)

Protein

d)

Lipids

182.
Which biomolecule is responsible for insulation and energy storage?
a)
Protein
b)
Nucleic Acid
c)
Lipid
d)
Carbohydrate
183.
Which biomolecule has sugars and starches?
a)
Lipids
b)
Proteins
c)
Carbohydrates
d)
Nucleic Acid
184.
Enzymes are considered to be 
a)
Lipids
b)
Carbohydrate
c)
Protein
d)
Nucleic Acid
185.
A monomer is ...
a)
a single atom
b)
a building block for polymers
c)
a single element
d)
is an inorganic molecule
186.
What type of molecule is this?
a)
Nucleic acid
b)
Protein
c)
Carbohydrate
d)
Lipid
187.
What elements are common to all 4 biomolecules?
a)
Carbon, hydrogen, nitrogen
b)
Carbon, Nitrogen, Phosphorus
c)
Carbon, Hydrogen, Oxygen
d)
Carbon, Hydrogen, Phosphorus
188.
What biomolecule do enzymes belong to? 
a)
Carbohydrate
b)
Lipid
c)
Nucleic Acid
d)
Protein
189.
Which biomolecule is found in pasta and bread?
a)
Lipid
b)
Protein
c)
Nucleic Acid
d)
Carbohydrate
190.
Which biomolecule is a main source of quick energy?
a)
Nucleic Acid
b)
Protein
c)
Lipid
d)
Carbohydrate
191.
Which biomolecule is found in fats, oils, and waxes and is a source of long-term energy? 
a)
Proteins
b)
Nucleic Acid
c)
Lipids
d)
Carbohydrate
192.
What is the function of a nucleic acid?
a)
Stores genetic information
b)
Stores energy
c)
Quick source of energy
d)
Builds structures
193.
Carbon, Hydrogen, Oxygen and Nitrogen are elements in what biomolecule?
a)
Carbohydrate
b)
Lipid
c)
Protein
d)
Nucleic acid
194.

Protons and neutrons are found in the center of the atom called the:

a)

nucleus

b)

neutron

c)

shell

d)

cell

195.

Substances that have only one kind of atom are called:

a)

elements

b)

nitrogen

c)

electrons

d)

nucleus

196.

Electrons have a _____ charge.

a)

neutral

b)

negative

c)

positive

d)

both positive and negative

197.
How do covalent bonds form?
a)
Donating & receiving valence e- between atoms.
b)
Opposite slight charges attract each other between compounds.
c)
Scientists are still not sure how they form.
d)
Sharing valence e- between atoms.
198.
Covalent bonds are between...
a)
Metal and Non-metal
b)
Non-metal and Non-metal
c)
Metal and Metal
199.

Select the products in the following chemical formula:  CH4 +2O2 → CO2+ 2H2OCH_{4\ }+2O_2\ \rightarrow\ CO_2+\ 2H_2O  

a)

2H2O2H_2O  

b)

2O22O_2  

c)

CH4CH_4  

d)

CO2CO_2  

200.

Select the reactants in the following chemical formula:  CH4 +2O2 → CO2+ 2H2OCH_{4\ }+2O_2\ \rightarrow\ CO_2+\ 2H_2O  

a)

2H2O2H_2O

b)

2O22O_2

c)

CH4CH_4

d)

CO2CO_2

201.

In 2NaCl, the 2 is called the _____________________.

a)

Molecule

b)

Subscript

c)

Coefficient

d)

Exponent

202.

How many Hydrogen (H) molecules are in  2H2O2H_2O  ?

(a)  

203.

How many Oxygen (O) molecules are in  2H2O2H_2O  ?

(a)  

204.

In CH4, In\ CH_4,\  the 4 is called the _________________________.

a)

Molecule

b)

Subscript

c)

Coefficient

d)

Exponent

205.

The process of making alloys involves (a)   (cooling,

heating, mixing)

pure metals to remove impurities.

206.

To create an alloy pure metals are (a)   (broken down, cooled, mixed) with other components.

207.

Drill bits are attached to power drills to make holes. Drill bits are made because they’re hard and resistant to corrosion.

a)

alloys

b)

ceramics

c)

composites

d)

plastics

208.

The bodies and handles of power drills are made of ________________ because they’re good insulators.

a)

alloys

b)

composites

c)

plastics

d)

ceramics

209.

The item is made from synthetic materials. Identify the property (or properties) associated with each material.


conducts heat

a)
b)
c)
210.

The item is made from synthetic materials. Identify the property (or properties) associated with each material.


brittle (shatters into many pieces)

a)
b)
c)
211.

The item is made from synthetic materials. Identify the property (or properties) associated with each material.


insulates from heat

a)
b)
c)
212.

Check each each material that is a composite.

a)

plywood

b)

plastic

c)

concrete

d)

nylon

e)

paper

213.

Check each each material that is a polymer.

a)

plywood

b)

plastic

c)

concrete

d)

nylon

e)

paper

214.

Match the synthetic materials with the processes used to make them.


synthetic polymer

a)

heating clay and sand at high temperatures

b)

using oil and gas as starting materials

c)

mixing a metal element with other elements

215.

Match the synthetic materials with the processes used to make them.


alloy

a)

heating clay and sand at high temperatures

b)

using oil and gas as starting materials

c)

mixing a metal element with other elements

216.

Match the synthetic materials with the processes used to make them.


ceramic

a)

heating clay and sand at high temperatures

b)

using oil and gas as starting materials

c)

mixing a metal element with other elements

217.

Which two statements about composite materials are true?

a)

They’re made up of more than one substance.

b)

They have the same or similar properties as the materials used to make them.

c)

They’re always made of metal.

d)

They’re readily available in nature.

218.

Which characteristic is not a characteristic of plastic?

a)

easy to mold

b)

good conductor of heat

c)

lightweight and durable

d)

repels water

219.

Which statement about polymers is true?

a)

Polymers are substances that have relatively large molecules.

b)

Oil and gas are the starting materials for making all polymers.

c)

Fabrics such as cotton and silk are synthetic polymers.

d)

All polymers are obtained from living organisms.

220.

Which statement about cellulose is true?

a)

It’s a synthetic polymer.

b)

It’s a raw material used to make plastic.

c)

It’s produced using oil and gas.

d)

It’s used to make paper products.

221.

Which item is made from a synthetic material?

a)

cotton pants

b)

leather jacket

c)

frying pan

d)

wicker basket

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