Exploring Physical and Chemical Changes

What is the primary characteristic of a physical change?

• Irreversible change

• Alteration of physical properties without changing chemical structure

• Formation of a new substance

• Change in the chemical nature of the substance

Which example indicates a physical change?

• Rusting of iron

• Baking a cake

• Burning wood

• Dissolving sugar in water

What is a sign of a chemical change?

• Change in color

• Change in size

• Change in shape

• Mixing without reaction

Which scenario is an example of a chemical change?

• Ice melting

• Wood burning

• Water boiling

• Cutting paper

What happens to the molecules in a chemical change?

• They dissolve

• They rearrange to form new substances

• They separate without forming new substances

• They remain unchanged

What is required to reverse a chemical change?

• Mixing with another substance

• Change in temperature

• Simple physical action

• It cannot be reversed

Is slicing bread a physical or chemical change?

• Chemical change

• Physical change

• Both

• Neither

What does boiling water demonstrate?

• Neither type of change

• Both types of changes

• Physical change

• Chemical change

Which action is a physical change?

• Cooking eggs

• Freezing juice

• Lighting a match

• Digesting food

What does the dissolving of Kool-Aid demonstrate?

• Physical change

• Chemical change

• Neither type of change

• Both types of changes