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Semester Exam Review

Total questions: 129

Worksheet time: 1hrs 18mins

Name
Class
Date
1.

How many atoms of Hydrogen are in H2O

a)

1

b)

2

c)

3

d)

more than 3

2.

How many different elements are present in H2COCH2

a)

5

b)

4

c)

3

d)

2

3.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

4.

How many Magnesium atoms are in 10MgCl2?

a)

10

b)

5

c)

20

5.

How many atoms are there TOTAL in H2SO4 ?

a)

6

b)

5

c)

7

d)

3

6.

How many Sodium atoms are in 6NaCl?

a)

1

b)

12

c)

6

7.

How many total POTASSIUM atoms are in this formula?

a)

8

b)

2

c)

4

d)

12

8.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
9.

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

10.

How many elements are in this chemical formula? NaHCO3NaHCO_3  

a)

1

b)

2

c)

3

d)

4

11.

How many total atoms are in the formula: Zn(C2H3O2)2 ?

(a)  

12.

How many atoms of Hydrogen are in this compound?

a)

1

b)

2

c)

3

d)

4

13.

NaCl is the chemical formula for salt. Is NaCl considered a compound or an element?

a)

element

b)

compound

c)

both

d)

neither

14.

We breathe oxygen. Its chemical formula is O2. Is this formula an element or a compound?

a)

element

b)

compound

c)

neither

d)

both

15.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
16.
Blue Color: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
17.
Flammability (burns): Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
18.

The density of the item is 5g/ml: Chemical or Physical Property

a)

Chemical Property

b)

Physical Property

19.

Which of the following is not a chemical property?

a)

rusting

b)

boiling point

c)

burning

20.

Chains rusting - What is the property?

a)

Physical property

b)

Chemical property

21.

Which is NOT a physical property?

a)

The smell of fresh baked cookies

b)

The object reacts with acid and the object begins to burn.

c)

The charger will be a good conductor of electricity

d)

The magnet has the property of magnetism.

22.

Physical properties are

a)

properties that can be observed without changing the identity of the substance

b)

properties that undergoes a change or reacts with a substance. (A new substance)

23.
Brittleness: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
24.
Luster: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
25.

The ability to hammered into a thin sheet or be bent is

a)

Ductility

b)

Solubility

c)

Density

d)

Malleability

26.

The ability to be drawn out into at thin wire.

a)

Ductility

b)

Solubility

c)

Density

d)

Malleability

27.

Metal or Nonmetal:

The object is dull, brittle, and a poor conductor of electricity.

a)

Metal

b)

Nonmetal

28.
Which of the following is a chemical change?
a)
Iron rusting 
b)
Glass breaking
c)
Clothing ripping
d)
Hair cut
29.
Is this equation balanced?
a)
Yes
b)
No
c)
Not enough information
30.
What is the law of conservation of matter?
a)
Matter changes when reacted or changed.
b)
The mass of all reactants are changed during a physical or chemical change.
c)
The mass of the reactants is the same as the mass of the products.
d)
The mass of the products is different than the mass of the reactants.
31.
Which of the following is an example of a physical change, and why? 
a)
Fire burns in fireplace, because a new substance is formed. 
b)
Clothes are folded, because there is a color change. 
c)
A mirror is broken, because there is a change in shape/size.
d)
cookies are baked, because there is a change in temperature
32.
This number is used to represent the number of each atom being represented.  What is the name of this number? 
a)
An Exponent
b)
The Coefficient
c)
A Molecule
d)
The Subscript
33.
This appears on the left side of a chemical formula, and represents how many compounds there are.  What is the name of this number?
a)
A Dangling Participle 
b)
The Subscript
c)
A Prime Number
d)
The Coefficient
34.
How many hydrogen atoms are in this chemical formula: 
a)
4 hydrogen atoms
b)
1 hydrogen atom
c)
2 hydrogen atoms
d)
3 hydrogen atoms
35.

The atomic number of oxygen is

a)

8

b)

15.9994

c)

16

d)

O

36.

Identify the elements in this compound.

a)

Carbon, Helium, Oxygen

b)

Chromium, Hydrogen, Oxygen

c)

Calcium, Hydrogen, Oxygen

d)

Carbon, Hydrogen, Oxygen

37.

The number of electrons in a Lithium atom is

a)

3

b)

4

c)

6

d)

7

38.

Electrons are

a)

Positively charged particles

b)

Negatively charged particles

c)

Neutral

39.

If an atom has 3 electrons, how many protons does it have?

a)

1

b)

2

c)

3

d)

4

40.

A group of elements that are shiny, conduct heat and electricity well is called

a)

Metals

b)

Non-metals

c)

Metalloids

41.

What is made up two or more elements that are chemically combined?

a)

Atom

b)

Element

c)

Compound

d)

Mixture

42.

Which of these is a property of metals?

a)

Malleable

b)

Very brittle

c)

Can't conduct electricity

43.

What does the nucleus of an atom contain?

a)

Electrons and neutrons

b)

Protons and neutrons

c)

Electrons and protons

d)

DNA

44.

Which is an example of an heterogenous mixture?

a)

soy sauce

b)

salad

c)

tea

d)

guacamole

45.

The matter you see is made of particles you cannot see. The smallest part of an

element is a (n) ____________________

a)

element

b)

mixture

c)

molecule

d)

atom

46.

Substances that cannot be broken down into any other substances by chemical or physical means is a (n) ____________________

a)

element

b)

mixture

c)

molecule

d)

compound

47.

Two or more different elements chemically combined is a (n) ____________________.

a)

atom

b)

mixture

c)

molecule

d)

compound

48.

Which of the following is an example of a mixture?

a)

nitrogen

b)

water

c)

chlorine

d)

salad dressing

49.

Which of the following is an example of an element?

a)

water

b)

salt

c)

chlorine

d)

soil

50.

A combination of substances that can be easily separated into its original parts is

known as a (n) _______________.

a)

compound

b)

mixture

c)

element

d)

atom

51.

Which is an example of a compound?

a)

oxygen

b)

gold

c)

orange juice

d)

table salt

52.

According to the Bohr Model, where are the electrons located?

a)

nucleus

b)

periodic table

c)

not located there

d)

shells (orbitals/valence)

53.

The periodic table is used worldwide for organizing elements into categories based

on how they react. Elements are arranged by ______.

a)

reactant color

b)

crystal shape

c)

atomic number

d)

alphabetically

54.

What is the number of neutrons for the element, Beryllium?

a)

N = 5

b)

N = 4

c)

N = 3

d)

N = 2

55.

On the periodic table, identify the rules for writing element symbols.

a)

All leters are capitalized

b)

First letter is capitalized, second letter is lower case

c)

All letters are lower case

d)

First letter is lower case, second letter is capitalized

56.

Ashley made a mixture of sugar and water and a mixture of sand and water. Which of the following is true?

a)

Both mixtures are homogeneous

b)

Both mixtures are heterogeneous

c)

The sugar and water is heterogeneous

d)

The sand and water is heterogeneous

57.

What is the symbol for Oxygen

a)

Ca

b)

Fe

c)

Cl

d)

N

e)

O

58.

What is the symbol for Nitrogen

a)

Ca

b)

Fe

c)

Cl

d)

N

e)

O

59.

What is the symbol for Chlorine

a)

Ca

b)

Fe

c)

Cl

d)

N

e)

O

60.

What is the symbol for Calcium

a)

Ca

b)

Fe

c)

Cl

d)

N

e)

O

61.

What is the symbol for Iron?

a)

Ca

b)

Fe

c)

Cl

d)

N

e)

O

62.

Refer to the diagram for question # 33


In the graphic above, #49 is pointing to the ________.

a)

atomic number

b)

atomic mass

c)

element name

d)

symbol

63.

What do we call variables that are constant or stay the same?

a)

independent variables

b)

controlled variables

c)

dependent variables

d)

manipulated variables

64.

___________ are properties that use the 5 senses or measuring tools.

a)

quantitative

b)

qualitative

c)

measurements

d)

inferences

65.

Observations that use numbers, amounts, or measurements are _____________.

a)

dependent

b)

independent

c)

qualitative

d)

quantitative

66.

The higher the temperature of water, the faster the egg will cook.


The independent variable in this example is_______.

a)

size of egg

b)

temperature of the water

c)

time it takes the egg to cook

d)

faster eggs

67.

More bushels of potatoes will be produced if the soil is fertilized.


The dependent variable in this example is ______.

a)

number of potatoes produced

b)

amount of soil in the pot

c)

amount of fertilizer in the soil

d)

the size of the potatoes in the soil

68.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
69.
What is the left part of a chemical equation called...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
70.
What is the right part of a chemical equation called...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
71.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
72.
Is this balanced?...
Fe + S --> FeS
a)
YES!
b)
NO!
73.
Is this balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
NO!
74.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
75.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
76.
Why is the following chemical equation not balanced?
H2 + O2 --> H2O
a)
each side of the equation has a different number of oxygen atoms
b)
each side of the equation has a different number of hydrogen atoms
c)
each side has the same mass
77.

What type of energy is created using this?

a)

chemical

b)

electrical

c)

mechanical

78.

Batteries have _________ energy.

a)

mechanical

b)

thermal

c)

chemical

79.

The sun gives off __________ energy.

a)

mechanical

b)

electrical

c)

radiant

80.

The law of conservation of energy says that energy cannot be created or destroyed.

a)

False

b)

True

81.

________ energy is also called heat energy.

a)

electrical

b)

mechanical

c)

thermal

82.

Triple beam balances measure ________________.

a)

Volume

b)

Length

c)

Mass

d)

Weight

83.

Find the mass.

a)

550.4 g

b)

559.4 g

c)

559.6 g

d)

550.6 g

84.

Find the mass.

a)

5 g

b)

0.5 g

c)

0.2 g

d)

0.7 g

85.

Easy -- What mass does the object have?

a)

521

b)

21

c)

520

d)

501

86.

What is the value on the balance?

a)

240.0 g

b)

142.0 g

c)

100.4 g

87.
What is the mass on this triple beam?
a)
200g
b)
44g
c)
244g
d)
4g
88.

How much volume is in the graduated cylinder?

a)

40.3 mL

b)

43 mL

c)

20 mL

d)

100 mL

89.

What is the volume of water in this graduated cylinder in ml?

(a)  

90.

What is the volume of water in this graduated cylinder in ml?

(a)  

91.

What is the volume of water in this graduated cylinder in ml?

(a)  

92.

1.    If you do not understand a direction or part of a laboratory procedure,  you should ____________.

a)

figure it out as you do the lab.

b)

try several methods until something works.

c)

ask the teacher before proceeding.

d)

skip it and go on to the next part

93.

After completing an experiment, all chemical wastes should be

a)

left at your lab station for the next class

b)

disposed of according to your teacher’s directions.

c)

dumped in the sink.

d)

taken home.

94.

Horseplay, practical jokes, or pranks in the lab are __________________.

a)

always against the rules.

b)

okay.

c)

not dangerous.

d)

Okay if you are working alone.

95.

When you finish working with chemicals, biological specimens, and other  lab substances, always _________________. 

a)

treat your hands with skin lotion.

b)

wash your hands thoroughly with soap and water.

c)

wipe your hands on a towel.

d)

wipe your hands on your clothes.

96.

Before you leave the science room, you should _______________.

a)

clean your work area and equipment.

b)

return all equipment to the proper area.

c)

wash your hands with soap and water

d)

All of the above.

97.

When you work in the lab, long hair must be _______________.

a)

Cut off

b)

Tied back out of the way

c)

Held by both hands

d)

Combed nicely

98.

Lisa boiled 5 cups of water in the pot. This is an example of a (n)  ______________. 

a)

Qualitative observation

b)

Quantitative observation

c)

Inference

d)

Conclusion

99.

The grass turned brown and stiff at the end of July. This is an example of  a (n) _______. 

a)

Hypothesis

b)

Qualitative observation

c)

Quantitative observation

d)

Inference

100.

For an experiment, a scientist put lime at the base of tomato plant A and  baking soda at the base of tomato plant B. She then sealed the plants in  plastic bags. Tomato plant A eventually died, and tomato plant B stayed  healthy.

What was the dependent variable in this experiment?

a)

Type of plant grown for the test

b)

Response of the plants to each substance

c)

Substance at the base of each plant

d)

Plastic bags wrapped around each plant

101.

A student planted the same kind of seeds in pots A and B. She planted  five seeds in pot A and five seeds in pot B. The amount and type of soil in  both pots was the same. She added the same amount of water to both pots  each week. Pot A was placed in a sunny window. Pot B was placed in a dark  room. After four weeks, she observed the plants in both pots. The plants in  pot A were green, with tall, thick stems. The plants in pot B were yellow,  with tall, thin stems.

Which statement best explains why the plants in pot A were different from  the plants in pot B?

a)

Pot A contained more soil than pot B.

b)

Pot A contained more seeds than pot B.

c)

Pot A received more sunlight than pot B.

d)

Pot A received more water than pot B

102.

What is the smallest particle of matter?

a)

Cells

b)

Atoms

c)

Electricity

d)

Forces

103.

Which of the following examples is an element?

a)

Fe

b)

CO2CO_2

c)

H2OH_2O

d)

Salt Water

104.

Carbon has a mass number of 12. Thus, it has __________ protons and  ________ neutrons.

a)

6, 6

b)

12, 12

c)

6, 12

d)

12, 6

105.

What element does the Bohr model 

represent? 

a)

K

b)

Cl

c)

Ar

d)

F

106.

A combination of substances that can easily separate into its original parts is known  as a(n) _________________.

a)

Compound

b)

Mixture

c)

Element

d)

Atom

107.

Substance that cannot be broken down into any other substances by chemical or physical means is a(n) ___________.

a)

Element

b)

Compound

c)

Mixture

d)

Molecule

108.

Two or more different elements chemically combined is a(n) ___________.

a)

Atom

b)

Mixture

c)

Molecule

d)

Compound

109.

Which mixture will be considered an example of a homogeneous mixture?

a)

beaker of water and oil

b)

beaker of sand and rocks

c)

beaker of water and kool-aid powder

d)

beaker of sand and water

110.

In going through the three physical states of matter, water would normally undergo changes in

a)

weight

b)

mass

c)

density

d)

composition

111.

Examine the table for properties of various substances (A-E) shown here. Calculate the densities for each of these substances. Determine which substances will float in water, which has a density of 1.0 g/ml.

a)

Substance A and B

b)

Substance B and C

c)

Substance C and D

d)

Substance D and E

e)

Substance A and C

112.

What is the density of an object that has a mass of 184g and a volume of 50mL?

a)

9200 g/mL

b)

3.68 g/mL

c)

.271 g/mL

d)

3.74 g/mL

113.

Which state of matter typically has the HIGHEST density?

a)

Gas

b)

Liquid

c)

Plasma

d)

Solid

114.

A balanced chemical reaction obeys the law of

a)

definite proportions

b)

conservation of energy

c)

conservation of mass

d)

ideal gas

115.

Melting point is an example of a _____________. 

a)

Physical property

b)

Chemical property

116.

Baking Bread is an example of a _______________.

a)

Chemical Change

b)

Physical Change

117.

Which is NOT a reactant in the chemical equation?

6CO2 + 6H2O + Sunlight → 6O2 + C6H12O6 

a)

Water ( H2OH_2O )

b)

Carbon Dioxide ( CO2CO_2 )

c)

Sunlight

d)

Glucose ( C6H12O6C_6H_{12}O_6 )

118.

Which element is not equal on both sides of the equation to support the Law of Conservation of Matter?

Ag + 2HCl → AgCl2 + H

a)

H

b)

Cl

c)

Ag

119.

According to the chemical equation above, in an Endothermic Reaction, heat energy is a _____________.

a)

Reactant

b)

Released

c)

Product

d)

Not present

120.

Taking a hot shower would be considered an ____________________ reaction.

a)

Chemical

b)

Endothermic

c)

Exothermic

121.

Maria’s father started a fire in the fireplace. He crumpled some paper, lit a match, and soon the logs in the fireplace were burning. In this case, the stored chemical energy in the logs was changed into

a)

Mechanical motion

b)

electrical energy

c)

electrical and heat energy

d)

heat and light energy

122.

_______________ reactions transfer energy to the surroundings, usually as heat.

a)

Endothermic

b)

Synthesis

c)

Decomposition

d)

Exothermic

123.

The light bulb converts electrical energy into light and _________.

a)

Electromagnetic

b)

Chemical

c)

Heat

d)

Nuclear

124.

An example of kinetic energy being converted into heat energy is

a)

Sun

b)

Snickers Bar

c)

Generator

d)

Rubbing your hands together

125.

___________ energy is a type of energy stored in the bonds of compounds and molecules that can be transformed through a chemical reaction into other substances.

a)

Thermal

b)

Heat

c)

Chemical

d)

Radiation

126.

A wet shirt is put on a clothesline to dry on a sunny day. The shirt dries because water molecules _________________.

a)

gain heat energy and condense

b)

gain heat energy and evaporate

c)

lose heat energy and condense

d)

lose energy and evaporate

127.

The energy of electromagnetic waves, or ________ energy, can travel through the vacuum of space.

a)

radiant

b)

Chemical

c)

Thermal

d)

Heat

128.

Your hands get warm by a fire because ________________energy is converted into heat energy.

a)

Electrical

b)

Nuclear

c)

Chemical

d)

Mechanical

129.

Marina is using a metal spoon to stir her hot soup. Why does the spoon feel warm?

a)

Heat energy from the soup is transferred to the spoon.

b)

Stirring creates heat energy in the spoon.

c)

Marina’s hand warms the spoon she is holding

d)

Heat energy from the spoon is transferred to the soup.

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