Chapter 7: Chemical Reactions

Question 1

the original substances present in a chemical reaction

Answer 1

Reactant

Question 2

chemical substances that result from a chemical reaction

Answer 2

Product

Question 3

This law states that matter can neither be created nor destroyed.

Answer 3

Law of Conservation of Mass

Question 4

chemical reactions that release out heat energy to the surroundings

Answer 4

Exothermic

Question 5

chemical reactions that absorb heat energy from the surroundings

Answer 5

Endothermic

Question 6

energy stored in chemical bonds that is released during chemical reactions

Answer 6

Chemical energy

Question 7

changes the arrangement of the atoms or molecules of the substances involved

Answer 7

Chemical process

Question 8

the process of burning something

Answer 8

Combustion

Question 9

are corrosive substances and have a pH below 7

Answer 9

Acid

Question 10

are corrosive substances and have a pH above 7

Answer 10

Base

Question 11

a chemical that wears away the surface of substances, especially metals

Answer 11

Corrosive

Question 12

bases that dissolve in water

Answer 12

Alkali

Question 13

Are acid–base substances that can be used to tell whether a substance is an acid or a base.

Answer 13

Indicators

Question 14

a mixture of indicators that changes colour as the strength of an acid or base changes, indicating the pH of the substance

Answer 14

Universal indicator

Question 15

When an acid reacts with a metal, the products are ______ and hydrogen gas.

Answer 15

Salt

Question 16

This type of reaction occurs when an acid and a base react with each other, the products include water and a salt.

Answer 16

Neutralisation

Question 17

the scale from 1 (acidic) to 14 (basic) that measures how acidic or basic a substance is

Answer 17

pH scale