Physical Science

Question 1

A chemical reaction

Answer 1

A chemical reaction happens whenever atomic bonds are formed or broken

Question 2

What are the initial ingredients in a chemical reaction called?

Answer 2

Reactants

Question 3

What are the resulting substances of a chemical reaction called?

Answer 3

Products

Question 4

How do you speed up a chemical reaction?

Answer 4

Adding heat, increase surface area, increase concentration of reactants, or add catalysts.

Question 5

A+B=AB

Answer 5

Composition Reaction

Question 6

AB=A+B

Answer 6

Decomposition Reaction

Question 7

AC+DE–ADE+C

Answer 7

Single Displacement Reaction

Question 7

AC+DE–ADE+C

Answer 7

Single Displacement Reaction

Question 8

AC+DE–AD+CE

Answer 8

Double Displacement Reaction

Question 9

Enzymes

Answer 9

A catalyst found in living cells

Question 10

Catalyst

Answer 10

A substance added to speed up a reaction.

Question 11

Inhibitors

Answer 11

Prevents reactions by keeping reactants apart and bonding with one of the reactants

Question 12

A chemical Equation

Answer 12

It describes what happens in a chemical reaction

Question 13

Reactants

Answer 13

What are the elements or compounds on the left side of a chemical equation called?

Question 14

What are the elements or compounds on the right side of a chemical equation called?

Answer 14

Products

Question 15

Why is it helpful to use a chemical equation?

Answer 15

So that you don’t have to write out all the molecules.

Question 16

How does a catalyst work?

Answer 16

It reduces the amount of energy needed for a reaction

Question 17

Why is it important that living cells have enzymes?

Answer 17

If we didn’t, chemical reactions would occur so slowly that we wouldn’t be able to live.

Question 18

What is an exothermic reaction?

Answer 18

A reaction that releases energy

Question 19

A reaction that stores energy.

Answer 19

What is an endothermic reaction?

Question 20

Enthalpy

Answer 20

The amount of energy stored in a substance’s bonds.

Question 21

Homogeneous catalyst

Answer 21

If the catalyst and the reactants are in the same phase, they are called…

Question 22

Heterogeneous catalyst

Answer 22

If the type catalyst is one that is in a different phase from the reactants, they are called…

Question 23

The rate at which the reaction takes place

Answer 23

Reaction Rate

Question 24

First law of thermodynamics

Answer 24

The law that says matter and energy cannot be created or destroyed, they can only change forms.

Question 25

Activation Energy

Answer 25

The energy available to break the necessary bonds.