Quiz about Chemical Reactions Review HW

Question 1

What type of reaction is this?

AB --> A + B

Accepted Answer

decomposition

Answer

synthesis

Answer

single-replacement

Answer

double-replacement

Question 2

What type of reaction is this?

A + B = AB

Accepted Answer

synthesis

Answer

decomposition

Answer

single-replacement

Answer

double-replacement

Question 3

What type of reaction is this?

AB + CD --> AD + CB

Accepted Answer

double-replacement

Answer

synthesis

Answer

decomposition

Answer

single-replacement

Question 4

What type of reaction is this?

A + BC --> B + AC

Accepted Answer

single-replacement

Answer

synthesis

Answer

decomposition

Answer

double-replacement

Question 5

A decomposition reaction is the opposite of a synthesis reaction.

Accepted Answer

True

Answer

False

Question 6

A combustion reaction is a reaction in which a substance reacts with carbon dioxide, often producing heat and light.

Accepted Answer

False

Answer

True

Question 7

The reaction that forms water can be classified as either a synthesis reaction or a combustion reaction.

Accepted Answer

True

Answer

False

Question 8

The new substances formed as a result of a chemical reaction are called products.

Accepted Answer

True

Answer

False

Question 9

Which of the following sentences are correct interpretations of the chemical equation C + O₂ --> CO₂.

Accepted Answer

carbon and oxygen react and form carbon dioxide

Accepted Answer

the reaction of carbon and oxygen yields carbon dioxide

Answer

carbon and oxygen react and form carbon monoxide

Answer

carbon dioxide yields carbon and oxygen

Question 10

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Accepted Answer

True

Answer

False

Question 11

A chemical equation must be balanced in order to show that mass is conserved during a reaction.

Accepted Answer

True

Answer

False

Question 12

What is the name given to the numbers that appear before formulas in a chemical equation?

Accepted Answer

coefficients

Answer

subscripts

Answer

mass numbers

Answer

atomic numbers

Question 13

Is the reaction below balanced?

N₂H₄ + O₂ --> N₂ + H₂O

Accepted Answer

No

Answer

Yes

Question 14

An oxidation-reduction reaction is a reaction in which electrons are transferred from one reactant to a product.

Accepted Answer

False

Answer

True

Question 15

When calcium reacts with oxygen, each calcium atom gains two electrons and becomes a calcium ion with a charge of 2-.

Accepted Answer

False

Answer

True

Question 16

Oxygen must be present in order for an oxidation-reduction reaction to take place.

Accepted Answer

False

Answer

True

Question 17

Chemical energy is stored in the chemical bonds of a substance.

Accepted Answer

True

Answer

False

Question 18

The formation of chemical bonds absorbs energy.

Accepted Answer

False

Answer

True

Question 19

The spark from an igniter provides enough activation energy to break the bonds of reacting molecules and get the combustion reaction started.

Accepted Answer

True

Answer

False

Question 20

An endothermic reaction is a chemical reaction that releases energy into its surroundings.

Accepted Answer

False

Answer

True

Question 21

Which of the following statements is correct for this graph.

Accepted Answer

the energy released as the products form is greater than the energy required to break the bonds in the reactants

Accepted Answer

the chemical energy of the reactants is greater than the chemical energy of the products

Answer

the energy required to break the bonds in the reactants is greater than the energy released as the products form

Answer

the chemical energy of the products is greater than the chemical energy of the reactants

Question 22

One way to observe the rate of a reaction is to observe how fast products are being formed.

Accepted Answer

True

Answer

False

Question 23

Storing milk in a refrigerator stops the reactions that would cause the milk to spoil.

Accepted Answer

False

Answer

True

Question 24

An increase in surface area decreases the exposure of reactants to one another.

Accepted Answer

False

Answer

True

Question 25

Increasing the concentration of the reactants will generally slow down a chemical reaction.

Accepted Answer

False

Answer

True

Question 26

Which of the statements correctly explain why chemists use catalysts?

Accepted Answer

to speed up a reaction

Accepted Answer

to enable a reaction to occur at a lower temperature

Answer

to enable a reaction to occur at a higher temperature

Answer

to slow down a reaction

Question 27

According to the equation C + O₂ --> CO₂, how many carbon atoms react with 14 atoms of oxygen to form 7 molecules of carbon dioxide?

Accepted Answer

7

Answer

1

Answer

14

Answer

28

Question 28

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Accepted Answer

True

Answer

False

Question 29

Which of the following are correct interpretations of the chemical equation C + O₂ --> CO₂.

Accepted Answer

Carbon and oxygen react and form carbon dioxide.

Accepted Answer

The reaction of carbon and oxygen yields carbon dioxide.

Answer

Carbon and oxygen react and form carbon monoxide.

Answer

Carbon dioxide yields carbon and oxygen.

Question 30

The new substances formed as a result of a chemical reaction are called products.

Accepted Answer

True

Answer

False

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