Physical Science: Chapter 7 Test

Front 1

In a _____, the total mass of the product always equals the total mass of the reactants.

Back 1

balanced chemical recation

Front 2

_____ is an enzyme that breaks down cellulose.

Back 2

cellulace

Hint 2

A instead of O

Front 3

_____ states that increasing temperature favors a reaction that absorbs energy as heat.

Back 3

Le Châtelier's principle

Front 4

In a _____, the reactants are broken down into other substances.

Back 4

decomposition reaction

Front 5

A chemical reaction that transfers energy from the reactants to the surrounding is referred to as _____.

Back 5

exothermic

Front 6

When a chemical reaction and it's reverse are occurring at the same time and at the same rate, the reaction has achieved _____.

Back 6

equilibrium

Front 7

A change of _____ is a sign that a chemical reaction is taking place.

Back 7

color

Front 8

Large, bulky molecules react more slowly than small ones because _____.

Back 8

they have less opportunity to collide with other molecules

Front 9

The changes that are visible during a chemical reaction are _____.

Back 9

signs that the atoms in the reactants have been rearranged

Front 10

A _____ is said to be reduced when it gains electrons.

Back 10

substance

Front 11

The product of the synthesis reaction between sodium and chlorine gas is _____.

Back 11

sodium chloride

Front 12

A chemical equation is balanced by changing or adding _____.

Back 12

coefficients

Front 13

The energy source in photosynthesis is _____.

Back 13

light energy

Front 14

A substance that undergoes a change in a chemical recation is a _____.

Back 14

reactant

Front 15

A _____ is a reaction between at least two compounds in which a new, more complex compound is formed.

Back 15

synthesis reaction

Front 16

In an _____, energy is transferred from the reactants to the surroundings

Back 16

exothermic reaction

Front 17

If you _____ the temperature of a reaction, generally you will _____ the rate of the reaction.

Likewise -

If you _____ the temperature of a reaction, generally you will _____ the rate of the reaction.

Back 17

increase

decrease

Front 18

When a reaction is at its _____, increasing the pressure favors the reaction that produces less gas.

Back 18

equilibrium

Front 19

In a state of _____, a reaction and it's reverse occur at the same time and at the same rate.

Back 19

equilibrium