Question

1. classify each of the following as a physical or chemical change.

a. ice melting
b. paper burning
c. metal rusting
d. gas pressure increasing
e. liquid evaporating
f. food digesting

1. compare a physical change with a chemical change.

a physical change is dosent involve a ch
of substance, a chemical is change in on
are converted into a different substance

1. compare and contrast each of the

a. mass and matter
matter is made up
b. atom and compound
a compound is two or

Explanation:

Step1: Recall physical - change definition

A physical change is a change in the form or state of matter without a change in its chemical composition.

Step2: Recall chemical - change definition

A chemical change results in the formation of a new substance with different chemical properties.

Step3: Analyze ice melting

Ice melting is a phase change from solid to liquid. The water molecules remain the same, so it's a physical change.

Step4: Analyze paper burning

Paper burning involves a chemical reaction with oxygen, producing ash, carbon - dioxide, etc. New substances are formed, so it's a chemical change.

Step5: Analyze metal rusting

Metal rusting is a chemical reaction between metal and oxygen in the presence of water, forming metal oxides. New substances are formed, so it's a chemical change.

Step6: Analyze gas pressure increasing

Increasing gas pressure is usually due to factors like temperature change or volume change. The gas molecules don't change chemically, so it's a physical change.

Step7: Analyze liquid evaporating

Liquid evaporation is a phase change from liquid to gas. The substance's chemical composition remains the same, so it's a physical change.

Step8: Analyze food digesting

Food digesting involves chemical reactions in the body to break down complex substances into simpler ones. New substances are formed, so it's a chemical change.

Answer:

a. Physical
b. Chemical
c. Chemical
d. Physical
e. Physical
f. Chemical