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Chemical Reactions

Total questions: 131

Worksheet time: 3hrs 46mins

Name
Class
Date
1.
Which is the name of the kind of solid substance formed in this figure?  
a)
aqueous 
b)
precipitate
c)
acid
d)
synthesis 
2.
What indicates a chemical reaction occurred?
a)

change of odor

b)
gas (bubbles) produced
c)
color change
d)
all of the above
e)

precipitate formation

3.

The process by which atoms are rearranged to produce new substances.

a)

Chemical Process

b)

Reactant

c)

Chemical Reaction

4.

During a ________, the bonds that hold atoms together may be formed or broken.

a)

Chemical formula

b)

Chemical equation

c)

Chemical reaction

5.

A change of properties is a sign that a chemical reaction has happened.

a)

True

b)

False

6.

Chemical formula uses the chemical symbols and numbers to represent a given substance.

a)

True

b)

False

7.

Uses chemical symbols and numbers to represent a given substance.

a)

chemical reaction

b)

Chemical symbols

c)

chemical substance

d)

chemical formula

8.
How many carbon atoms (C) are in a CO2 molecule?
a)
1
b)
2
c)
3
d)
0
9.
How many Oxygen atoms (O) are in a  molecule  of CO2
a)
1
b)
2
c)
3
d)
0
10.
The small number to the right of an elemental symbol  ( H2) is called?
a)
 a subscript 
b)
a coefficient 
c)
a variable 
d)
a divisor 
11.

What does the number 3 represent in 4NH3?

a)

Subscript

b)

Superscript

c)

Coefficient

12.

Which of the following is a chemical formula?

a)
Co
b)
O2
c)
C
d)
CO2
13.

What is a chemical equation?

a)

Describes the number of elements in a compound.

b)

One or two letters that represent the elements on the periodic table.

c)

The number to the lower right of an element that shows the number of atoms bonded.

d)

A written description of a chemical reaction.

14.

Identify the number in blue.

a)

Product

b)

Reactant

c)

Coefficient

d)

Subscript

15.
What do you call the substances on the left side of a chemical equation?
a)
yield
b)
products
c)
reactants
d)
compounds
16.

A_________is an expression that uses symbols to show the relationship between the starting substances and the substances that are produced by a chemical reaction.

a)

Chemical formula

b)

chemical change

c)

chemical reaction

d)

chemical equation

17.

Are the substances that participate in a chemical reaction. There chemical formulas are written on the left.

a)

Products

b)

Reactants

c)

Yield Sign

18.

They are the substances formed in a reaction. Their chemical formulas are written on the right.

a)

Product

b)

Reactants

c)

Yield sign

19.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
20.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
21.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
22.

Evidence of a chemical change

a)

A color change

b)

A change in odor

c)

Precipitate formation

d)

Gas bubbles

e)

transformation

23.

When writing a chemical equation:

a)

You must be sure that the reactants and products contain different number of atoms of each element.

b)

You must be sure that the reactants and products contain the same number of atoms of each element.

24.

When writing a chemical equation.....

a)

Balance the equation

b)

Change the numbers

c)

Change the equation

25.

Which formulas below have coefficients of 4? Check all that apply.

a)

4CO24CO_2

b)

4CH44CH_4

c)

4H2O24H_2O_2

d)

4Br34Br_3

26.

Which chemical formula below matches the image shown here?

a)

2H2O2H_2O

b)

H2O2H_2O_2

c)

4H2O4H2O

d)

2HO2HO

27.

3H2O3H_2O  

Which image below matches this chemical formula?

a)
b)
c)
d)
28.

_______ and ________ release energy when they react to form water.

a)

Nitrogen, Oxygen

b)

Hydrogen, Oxygen

c)

Arsenic, Sodium

29.

What is the substance present at the END of a reaction called?

a)

Product

b)

Exponent

c)

Integer

d)

Reactant

30.

How do you know baking a cake is a chemical reaction?

a)

It tastes yummy.

b)

A new substance is formed.

c)

You mixed it together.

d)

It has ingredients.

31.

In ENDOTHERMIC reactions, energy is _____ by the reaction system from the surroundings.

a)

Absorbed

b)

Released

c)

Eliminated

d)

Obliterated

32.

In EXOTHERMIC reactions, energy is _____ from the reaction to the surroundings.

a)

Absorbed

b)

Released

c)

Eliminated

d)

Evaporated

33.

What usually happens to TEMPERATURE in an ENDOthermic reaction?

a)

Increases

b)

Decreases

c)

Stays the same

34.

Temperature usually _____ in EXOthermic reactions.

a)

Stays the same

b)

Increases

c)

Decreases

35.

Photosynthesis is an _____ reaction.

a)

EXOthermic

b)

ENDOthermic

36.

Cooking and baking are _____ reactions.

a)

EXOthermic

b)

ENDOthermic

37.

Fireworks are an _____ reaction.

a)

EXOthermic

b)

ENDOthermic

38.

The starting temperature of a reaction was 21 degrees Celsius and the ending temperature was 44 degrees Celsius. What type of reaction occurred?

a)

EXOthermic

b)

ENDOthermic

39.

Which of the following categories of reactions can be used to classify both physical and chemical changes? (Multiple Response-MR)

a)

endergonic

b)

endothermic

c)

exergonic

d)

exothermic

40.

Which of the following 2 are chemical reactions?

a)

sugar dissolving in water

b)

water turning into steam

c)

burning wood

d)

mixing baking soda and vinegar

e)

tearing paper

41.

Which of the following is a common sign that a chemical change has occurred?

a)

A chemical has turned a different color, bubbled, and/or changed temperature.

b)

A chemical has changed to a different state of matter, such as a liquid to a solid.

c)

A chemical has changed size.

d)

A chemical has become a different shape.

42.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
43.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
44.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 
a)
catalyst
b)
product
c)
reactant
d)
solute
45.

When we investigate the rate of reaction we are looking at the...

a)

amount of product formed

b)

speed of reaction

c)

concentration of reacting particles

d)

combining reactants with products

46.

How could we make this reaction happen more quickly?

a)

Decrease the concentration of the acid

b)

crush the chalk to increase the surface area

c)

Put the test tube in an ice bath

47.
To slow down a chemical reaction you will do one of the following:
a)
Place the reactants in hot water
b)
Place the products in ice bath
c)
Place the reactants in a ice bath
d)
Keep stirring the reactants with a stirring rod
48.
The amount of a substance in a given volume.
a)
concentration
b)
temperature
c)
surface area
d)
catalyst
49.
Increasing the concentration increases the speed of reaction by
a)
lowering activation energy
b)
increasing collisions
c)
speeding up the reactants
d)
exposing more reactant
50.

As the frequency of ______________ increases, the rate of reaction increases.

a)

Time

b)

Reactions

c)

Collisions

d)

Reactants

51.

Icing sugar has a greater ______ _____ than a solid cube of

sugar.

a)

Surface Area

b)

Catalyst

c)

Temperature

52.

What is the main capacity of Carbon?

a)

To make short compound chains.

b)

To make unstable bonds with other carbon atoms.

c)

To make stable bonds/links with other carbon atoms .

53.

What is the name of this bond C=C?

a)

single bond

b)

double bond

c)

triple bond

54.

How many valence electrons does carbon have?

a)

4

b)

5

c)

6

d)

7

55.

The secret to carbon's ability to form a wide variety of molecules lies in the arrangement of its electrons

a)

True

b)

False

56.

Bonds between two atoms always form in pairs of electrons.

a)

True

b)

False

57.

What is the main capacity of Carbon?

a)

To make short compound chains.

b)

To make unstable bonds with other carbon atoms.

c)

To make stable bonds/links with other carbon atoms .

58.
All ____________ are made up of two or more atoms bonded together.
a)
atoms
b)
molecules
c)
electrons
d)
elements
59.

Chemical formulas contain:

a)

Types of atoms in the molecule

b)

Carbs in an atom

c)

Number of atoms in each molecule

60.

This ability to form bonds with other carbon atoms makes it possible for long chains of carbon atoms to form.

a)

True

b)

False

61.

Where are organic compounds found?

a)

In living things

b)

in nonliving things

c)

carbon

d)

a structural formula

62.

The numbers in a chemical formula identifies the types of atoms in the molecule

a)

True

b)

False

63.

Types of structural formulas:

a)

Full Structural formula

b)

Polymers

c)

Organic Compound

d)

Simplified Structural Formula

64.

Full Structural Formula

a)

shows all of the bonds between the molecules and the cells

b)

shows all of the bonds between the atoms of a molecule

c)

does not show every bond

65.

Simplified Structural formula

a)

shows all of the bonds between the molecules and the cells

b)

shows all of the bonds between the atoms of a molecule

c)

does not show every bond

66.

Identify

a)

Simplified Structural Formula

b)

Full Structural formula

67.

organic compound is a chemical compound that is composed of:

a)

hydrogen

b)
oxygen
c)
carbon
d)

other elements

68.
Organic compounds are in all?
a)

animals

b)

plants

c)
living organisms
d)

trees

e)

all of the above

69.

Organic compounds provide energy and structure for living things to grow and change.

a)

True

b)

False

70.

Organic compounds are usually composed of mostly carbon and nitrogen.

a)

True

b)

False

c)

They are composed of carbon, hydrogen and some other elements are fluorine, chlorine, oxygen, phosphorus, nitrogen, and sulphur.

71.

Nitrogen is found in the nucleic acids that make up DNA.

a)

True

b)

False

72.

Three clases of organic compounds:

a)

Carbohydrates

b)

Carbon

c)

Hydrocarbons

d)

Organic Acids

73.

What other structures can organic compound form?

a)

Rings: a change of carbon atoms curled around and attach to form a ring

b)

Polymers: molecules composed of the same repeating small groups joined together in long chains.

c)

a neutral organic compound containing carbon, hydrogen, and oxygen atom.

74.

Which picture is a monomer?

a)
b)
75.

A ________ is an organic compound that contains only carbon atoms and hydrogen atoms.

a)

hydrocarbon

b)

carbohydrate

c)

organic acids

76.

Most long-chain hydrocarbons are found in oils and waxes, their high energy content makes the ideal fuels.

a)

True

b)

False

77.

A________ is a neutral organic compound containing carbon, hydrogen, and oxygen.

a)

carbohydrate

b)

hydrocarbon

c)

organic acid

78.

Carbohydrates are one of nature's energy storages; living things break down carbohydrates and use the energy released to grow and reproduce.

a)

True

b)

False

79.

An ______ is an organic compound that has acidic properties.

a)

organic acid

b)

carbohydrate

c)

hydrocarbon

80.

Organic acids are not identified by a group called a carboxyl.

a)

True

b)

False

c)

Organic acids are identified by a group called carboxyl.

81.

In a carboxyl group, one oxygen atom is double-bonded to a carbon atom.

a)

True

b)

False

c)

In a carboxyl group, one oxygen atom is single-bonded to a carbon atom.

82.

Choose the correct aromatic compounds

a)

lavinzine

b)

fanzine

c)

vanillin

d)

aspirin

83.

Carbohydrates contain 2H for each O.

a)

True

b)

False

84.

Are carbohydrates difficult and complex?

a)

YES

b)

NO

85.

OH= acid

a)

YES

b)

NO

86.

Organic acids contain carbon, hydrogen and oxygen.

a)

TRUE

b)

FALSE

87.

What is a nuclear reaction?

a)

Is a change that affects the nucleus.

b)

Is a change in which an unstable nucleus can give off energy and sometimes, particles.

88.

What happens during a nuclear reaction?

a)

some mass changes to energy

b)

nucleus changes

c)

everything around it explodes

d)

atoms are rearranged

89.
What is an isotope? 
a)
A charged atom
b)

An atom with same number of protons but different amounts of neutrons

c)
An atom with different amounts of protons
d)
A neutral atom
90.
Different isotopes have...
a)
different masses
b)
different atomic numbers
c)
different electrons
d)
different protons
91.
Isotopes are atoms of the same element with different #’s of __________ & therefore different __________.
a)
n0 ;  atomic #’s
b)
p+ ; atomic #’s
c)
e- ; atomic masses
d)
n0 ; atomic masses
92.

E= mc2 is equal to......

a)

( 3.000 × 108 m/s)

b)

( 4.000 × 106 m/s)

c)

( 3.000 × 108 m/h)

93.
A helium nucleus with two protons and two neutrons is called a(n) ____.  
a)
alpha particle
b)
electroscope
c)
beta particle
d)
gamma ray
94.

Gamma rays are positively charged.

a)

True

b)

False

95.

Gamma rays have

a)

no mass

b)

a huge mass

c)

a small mass

d)

an average mass

96.
Has the highest penetrating power.  Can penetrate our body.  Even several cm thick of lead or several meters thick of concrete cannot stop all of it.
a)
Alpha
b)
Beta
c)
Gamma
97.
Has the lowest penetrating power.  Can only penetrate 0.05 mm into the body and can be stopped by a piece of paper or clothing.
a)
Alpha
b)
Beta
c)
Gamma
98.

___________ is a nuclear reaction in which an unstable nucleus can give off energy and sometimes, particles.

a)

radioactive decay

b)

nuclear fission

c)

nuclear fusion

99.

Beta decay contains particles of positrons and electrons.

a)

True

b)

False

100.

Gamma rays are released during gamma rays.

a)

True

b)

False

101.

Gamma decay alone does not change the number of particles in the nucleus; therefore, it does not form a different element or isotope.

a)

True

b)

False

102.

Some of the energy released during alpha decay and beta decay is in the form of gamma rays.

a)

True

b)

False

c)

Some of the energy absorbed during alpha decay and beta decay is in the form of gamma rays.

103.

There are two types of beta particles: _____ and _______.

a)

electrons and positrons

b)

protons and neutrons

c)

electrons and protons

104.

Positrons have a charge of -1 and electrons have a charge of -2.

a)

True

b)

False

105.

A proton can break apart into a neutron and a positron that is released.

a)

True

b)

False

106.

Beta decay does not change a nucleus into that of a different element.

a)

True

b)

False

107.

The atomic number increases when electrons are released.

a)

True

b)

False

108.

The atomic number decreases when positrons are released.

a)

True

b)

False

109.

What are the effects of too much exposure to radiation?

a)

Fatigue

b)

Vomiting

c)

Hair Loss

d)

Increases the risk of cancer

110.

Define nuclear fusion.

a)

Nuclear fusion – small atoms combine to form a new, more massive nucleus.

b)

Nuclear fusion – splitting lighter atoms to make heavier ones – is what makes it possible.

c)

Nuclear fusion – combining heavier atoms to make lighter ones – is what makes it possible.

d)

Nuclear fusion – splitting heavier atoms to make lighter ones – is what makes it possible.

111.

This process, called nuclear fusion, is the energy source of all __________.

There may be more than one answer for this questions.

a)

planets

b)

suns

c)

stars

d)

plants

112.
Takes two small nuclei and combines them into a larger nucleus
a)
fission
b)
fusion
113.
The splitting of a nucleus into smaller nuclei is
a)
fusion
b)
fission
c)
half-life
d)
gamma radiation
114.
Where does fusion occur naturally?
a)
Underwater
b)
All around us
c)
In the radioactive waste
d)
On the sun
115.
An example of an uncontrolled fission reaction is _______________
a)
Nuclear power plants
b)
Radio active decay
c)
Atomic Bomb
d)
On the surface of the sun
116.
Which of the following is true about nuclear fusion?
a)
It is easy to implement.
b)
It produces less energy than nuclear fission.
c)
It produces more energy than nuclear fission.
d)
It has the ability to occur easily in everyday life.
117.
The splitting of a nucleus into smaller nuclei is
a)
fusion
b)
fission
c)
decay
d)
gamma radiation
118.

Powerful radiation that can cause biological damage.

a)

beta particle

b)

alpha particle

c)

gamma ray

d)

carbon dating

119.

Who was the first woman to win a Nobel Prize for her work with radioactivity?

a)

Lise Meitner

b)

Marie Curie

c)

Jane Goodall

d)

Judy Blume

120.
Fusion produces ____ nuclei.
a)
same-sized
b)
smaller
c)
larger
d)
all of the above
121.
Which nuclear process is shown in the picture?
a)
fission
b)
fusion
c)
alpha decay
d)
beta decay
122.
What are the two types of nuclear reactions?
a)
addition and reduction
b)
fusion and fission
c)
reduction and fission
d)
fusion and addition
123.
Very high temperature and pressure is required for:
a)
Fission
b)
 Fusion
c)
Radioactive Decay
124.
Nuclear Power's source comes from _________________.
a)

Uranium 23s

b)
Coal
c)
Natural Gas
d)
Oil and/or Coal
125.

How can we evaluate power from fusion?

a)

By its challenges

b)

By its potential benefits

c)

By its bonding purposes

d)

By its level of uranium

126.

Nuclear fission advantages

a)

A lot of energy for a little fuel

b)

Cheaper than fossil fuels

c)

Doesn't produce pollution

d)

It is radioactive

127.

Nuclear Fission disadvantages

a)

Extremely dangerous

b)

Not renewable

c)

Produces radioactive waste

d)

Its turns to radioactive soil

128.

Goal of Nuclear Reactions is to develop a source of clean and unlimited energy

a)

True

b)

False

129.
How do nuclear power-plants work?
a)
Fusion
b)
Half-life
c)
Fission
d)
Fusion or fission
130.
Splitting a uranium atom is called - 
a)
fission
b)
fusion
131.

What is produced by a hydrogen-oxygen fuel cell?

a)

Water and Carbon Dioxide

b)

Carbon Dioxide

c)

Water

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