Physical and Chemical Properties and Changes Answer Key

Physical Properties/Changes: These involve changes in the state, size, shape, or appearance of a substance without altering its chemical composition.

Examples include melting, dissolving, evaporating, cutting, and changes in physical states like ice melting or water evaporating.

Chemical Properties/Changes: These occur when the substance undergoes a transformation that changes its chemical makeup. Indicators include burning, rusting, reacting with acids or bases, producing gas or light, and changes in color or odor due to a chemical reaction.

Examples include flammability, rusting, souring, and combustion.

Physical and Chemical Properties and Changes Answers

Property/Change	Type

blue color

physical

density

physical

flammability (burns)

chemical

solubility (dissolves)

physical

reacts with acid

chemical

supports combustion

chemical

sour taste

physical

melting point

physical

reacts with water

chemical

hardness

physical

boiling point

physical

luster

physical

odor

physical

reacts with air

chemical

NaCl (table salt) dissolves in water

physical

Ag (silver) tarnishes

chemical

an apple is cut

physical

heat changes H2O to steam

physical

baking soda reacts with vinegar

chemical

Fe (iron) rusts

chemical

alcohol evaporates

physical

ice melts

physical

milk sours

chemical

sugar dissolves in water

physical

wood rots

chemical

pancakes cook

chemical

grass grows

chemical

a tire is inflated

physical

food is digested

chemical

paper towel absorbs water

physical

An ice cube is placed in the sun. Later, there is a puddle of water. Later still the puddle is gone.

physical

Two chemicals are mixed together and a gas is produced

chemical

A bicycle changes color as it rusts

chemical

A solid is crushed to a powder

physical

Two substances are mixed and light is produced

chemical

A piece of ice melts and reacts with sodium

chemical

Mixing salt and pepper

physical

Chocolate syrup is dissolved in milk

physical

A marshmallow is toasted over a campfire

chemical

A marshmallow is cut in half

physical

Scenario 1 (bread is hot, changes size)

chemical and physical

Scenario 2 (bread turns black)

chemical

Scenario 3 (changes color)

chemical

Scenario 4 (dry hair)

physical

Scenario 5 (creates bubbles, CO2 expands in size)

chemical and physical

Scenario 6 (color change)

chemical

Scenario 7 (shape change)

physical

Scenario 8 (color change)

physical

Scenario 9 (size changes, hormone reaction)

physical and chemical

Scenario 10 (change of natural state)

chemical

Changing the size and shapes of pieces of wood

false

In a physical change, the makeup of matter is changed

false

Evaporation occurs when the liquid water changes into a gas

true

Evaporation is a physical change

true

Burning wood

false

Combining hydrogen and oxygen to make water

false

Breaking up concrete

true

Sand being washed out to sea

false

When ice cream melts

false

Acid rain damaging a marble statue

false