Chemical Change

Question 1

physical properties

Answer 1

properties that you can either observe using your five senses — seeing, hearing, touching, smelling and tasting — or measure directly

Question 2

chemical properties

Answer 2

properties that describe how a substance combines with other substances to form new chemicals or how a substance breaks up into two or more different substances

Question 3

flammability

Answer 3

an indicator of how easily a substance catches fire

Question 4

reactivity

Answer 4

a measure of how likely a particular metal is to take part in a displacement reaction

Question 5

toxicity

Answer 5

the danger to your health caused when poisonous substances combine with chemicals in your body to produce new substances and damaging effects

Question 6

chemical change

Answer 6

change that results in a new substance being formed. During a chemical change, some chemical bonds break and others form.

Question 7

evaporates

Answer 7

change state from a liquid to a gas. Evaporation occurs only from the surface of a liquid.

Question 8

physical changes

Answer 8

change in which no new chemical substances are formed. A physical change may be a change in shape, size or state. Many physical changes are easy to reverse.