Quiz about Chapter 7 Chemical Reaction

Question 1

What kind of reaction occurs when potassium is placed in water?

Accepted Answer

a single-displacement reaction

Answer

a double-displacement reaction

Answer

a decomposition reaction

Answer

electrolysis

Question 2

All of the following factors may speed up a chemical reaction except

Accepted Answer

smaller surface area.

Answer

higher pressure.

Answer

higher temperature.

Answer

presence of catalyst.

Question 3

Which of the following are the products and reactants of a chemical reaction most likely to have in common?

Accepted Answer

atoms

Answer

molecules

Answer

physical properties

Answer

chemical properties

Question 4

Which of the following occurs when gasoline is burned?

Accepted Answer

New molecules are formed.

Answer

New elements are formed.

Answer

New atoms are formed.

Answer

All of the above

Question 5

The decomposition of water can be brought about by

Accepted Answer

electrolysis.

Answer

combustion.

Answer

synthesis reactions.

Answer

oxidation.

Question 6

Pieces of molecules that have one or more electrons available for bonding are

Accepted Answer

radicals.

Answer

reactants.

Answer

neutrons.

Answer

protons.

Question 7

A synthesis reaction between magnesium (Mg) and oxygen (O2) might produce

Accepted Answer

MgO

Answer

Mg2

Answer

O4

Answer

MgCO2

Question 8

A slow reaction is likely to occur when the reactants have ______ temperature and _______ surface area.

Accepted Answer

low, small

Answer

high, small

Answer

high, large

Answer

low, large

Question 9

Raising the temperature of a system favors the reaction that

Accepted Answer

absorbs energy.

Answer

is exothermic.

Answer

releases energy.

Answer

is exergonic.

Question 10

Increasing the amount of one substance in an equilibrium reaction favors the reaction that

Accepted Answer

produce less of the substance.

Answer

release heat energy.

Answer

absorb heat energy.

Answer

produce more of the substance.

Question 11

When a chemical reaction and its reverse occur at the same time and rate, the reaction is said to be in

Accepted Answer

equilibrium.

Answer

equality.

Answer

imbalance.

Answer

redox.

Question 12

A substance that undergoes a change in a chemical reaction is

Accepted Answer

a reactant.

Answer

a product.

Answer

a chemical.

Answer

an enzyme.

Question 13

The energy source in photosynthesis is

Accepted Answer

light energy.

Answer

chemical energy.

Answer

heat energy.

Answer

kinetic energy.

Question 14

A synthesis reaction is a reaction between at least two compounds in which

Accepted Answer

a new, more complex compound is formed.

Answer

one breaks down into at least two products.

Answer

a compound is decomposed by an electric current.

Answer

a compound burns in the presence of oxygen.

Question 15

Which enzyme breaks down cellulose into smaller molecules?

Accepted Answer

cellulase

Answer

amylase

Answer

protease

Answer

lipase

Question 16

When a chemical reaction and its reverse are occurring at the same time and at the same rate, the reaction has achieved

Accepted Answer

equilibrium.

Answer

displacement.

Answer

imbalance.

Answer

decomposition.

Question 17

What happens in a chemical reaction?

Accepted Answer

Atoms are rearranged.

Answer

Atoms are destroyed.

Answer

Atoms are created.

Answer

Atoms are heated and cooled.

Question 18

Most of the energy in an isooctane reaction is released in the form of

Accepted Answer

heat and light.

Answer

electrical energy.

Answer

water.

Answer

sound.

Question 19

What could you do to make yeast dough rise more slowly?

Accepted Answer

Reduce the temperature.

Answer

Add more yeast to the mixture.

Answer

Knead the dough more vigorously.

Answer

Add mold spores to the dough.

Question 20

A release of energy is a sign that

Accepted Answer

a chemical change is taking place.

Answer

a physical change has just occurred.

Answer

oxygen is present.

Answer

organic chemicals are present.

Question 21

Chemical energy is energy that is

Accepted Answer

stored in the form of chemical bonds.

Answer

added to a reaction in the form of heat.

Answer

caused by the movement of electricity.

Answer

released only when oxygen is present.

Question 22

In a redox reaction, the substance that accepts electrons is said to be

Accepted Answer

reduced.

Answer

oxidized.

Answer

electrified.

Answer

clarified.

Question 23

Which of these is not a sign of a chemical reaction?

Accepted Answer

The material dissolves.

Answer

A gas is given off.

Answer

Heat is released.

Answer

A color change occurs.

Question 24

A balanced chemical equation shows the proportions of reactants and products necessary for

Accepted Answer

mass to be conserved.

Answer

the reaction to occur.

Answer

energy use to be minimized.

Answer

electrolysis to occur.

Question 25

An enzyme is a special kind of catalyst that works to

Accepted Answer

speed up a specific biochemical reaction.

Answer

slow down a chemical reaction.

Answer

break down chemical elements.

Answer

maintain the correct temperature for a reaction.

Question 26

CFA

What happens during an exothermic reaction?

Accepted Answer

Energy is released

Answer

Energy is lost

Answer

Energy is created

Answer

Energy is absorbed

Question 27

CFA

Most reactions speed up when?

Accepted Answer

The reaction is in small pieces.

Answer

The temperature decreases.

Answer

Equilibrium is achieved.

Answer

The concentration of products increases.

Question 28

CFA

Which of the following equations is balanced?

Accepted Answer

2Mg + O₂--> 2MgO

Answer

Mg + O₂--> MgO

Answer

Mg + O₂--> 2MgO

Answer

2Mg + 2O₂--> 2MgO

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