Physical Science Chemical Reactions Review

Question 1

A rapid reaction between oxygen and a fuel is known as

Accepted Answer

combustion.

Question 2

Which of the following does NOT increase the number of particles of a sub. available to react in a chemical reaction?

Accepted Answer

adding a catalyst

Question 3

Which of the following is an example of how to supply activation energy to begin a reaction?

Accepted Answer

Heat the reaction flask on a hot plate.

Question 4

In a chemical equation, numbers often appear in front of a chemical formula. These numbers tell you the

Accepted Answer

number of molecules or atoms of each substance in the reaction.

Question 5

In chemical reactions, what does the principle of conservation of mass mean?

Accepted Answer

Matter is not created or destroyed.

Question 6

The only sure evidence for a chemical reaction is

Accepted Answer

the production of one or more new substances.

Question 7

The minimum amount of energy that has to be added to start a reaction is the

Accepted Answer

activation energy. .

Question 8

What happens when chemical bonds break and new bonds form?

Accepted Answer

a chemical reaction

Question 9

Anything that has mass and takes up space is considered

Accepted Answer

matter.

Question 10

The principle of conservation of mass is true

Accepted Answer

for reactions in both open and closed systems.

Question 11

Every chemical reaction involves a change in

Accepted Answer

energy.

Question 12

Which of the following is NOT a correct inference that you can make about the burning of gasoline?

Accepted Answer

The reaction is a physical change.

Question 13

CaCO3 represents a chemical

Accepted Answer

formula.

Question 14

Chemicals that act as biological catalysts by speeding up reactions in living things are

Accepted Answer

enzymes.

Question 15

Which is the correct chem, equation for the following? Sodium reacts with oxygen in a 2 to 1 ratio to make sodium oxide.

Accepted Answer

2 Na + O2 --> Na2O

Question 16

The best way to put out a small kitchen fire is to

Accepted Answer

cover it or use a home fire extinguisher.

Question 17

In what way can a fire be brought under control?

Accepted Answer

Remove oxygen.

Question 18

A chemical reaction that absorbs energy in the form of heat is described as

Accepted Answer

endothermic.

Question 19

Which of the following is a balanced chemical equation?

Accepted Answer

2 Fe2O3 + 3 C --> 4 Fe + 3 CO2

Question 20

The substances listed on the left side of a chemical equation are the

Accepted Answer

reactants.

Question 21

Which two processes could be considered opposites?

Accepted Answer

a synthesis reaction and a decomposition reaction

Question 22

A material used to decrease the rate of a chemical reaction is a(n)

Accepted Answer

inhibitor.

Question 23

What type of reaction is FeS + 2 HCl ® FeCl2 + H2S?

Accepted Answer

a double replacement reaction

Question 24

Chemistry is

Accepted Answer

the study of matter and how matter changes.

Question 25

A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a

Accepted Answer

decomposition reaction.

Question 26

What is the best form of fire safety?

Accepted Answer

fire prevention

Question 27

A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be

Accepted Answer

balanced.

Question 28

A shorter, easier way to show chemical reactions, using symbols instead of words, is called a

Accepted Answer

chemical equation.

Question 29

The number placed below an element’s symbol in a chemical formula is called a

Accepted Answer

subscript.

Question 30

When a chemical reaction takes place in an open system,

Accepted Answer

matter can enter from or escape to the surroundings.

Physical Science Chemical Reactions Review

Questions 30

Physical Science Chemical Reactions Review

Questions 30