Understanding Changes in Matter

What is a physical change?

• A physical change is a change that does not alter the chemical composition of a substance.

• A physical change alters the chemical composition of a substance.

• A physical change involves a chemical reaction.

• A physical change is a change that cannot be reversed.

What is a chemical change?

• A chemical change is a physical alteration of a substance.

• A chemical change involves only the rearrangement of atoms without forming new substances.

• A chemical change is a process that only occurs at high temperatures.

• A chemical change is a process where substances combine or break apart to form new substances.

Which of the following is an example of a physical change?

• Freezing water

• Burning wood

• Dissolving sugar in water

• Melting ice

Which of the following is an example of a chemical change?

• Sugar dissolving in water

• Ice melting into water

• Rust forming on iron

• Boiling water to steam

Is melting ice a physical change or a chemical change?

• Evaporation process

• Physical change

• Phase transition

• Chemical change

Is rusting of iron a physical change or a chemical change?

• No change at all

• Chemical change

• Physical change

• Oxidation process

What happens to the substance in a physical change?

• The substance becomes unrecognizable in form and function.

• The substance retains its chemical identity.

• The substance changes into a different chemical compound.

• The substance loses its physical properties completely.

What happens to the substance in a chemical change?

• The substance is only physically altered.

• The substance is transformed into one or more new substances.

• The substance evaporates into gas.

• The substance remains unchanged.

Can physical changes be easily reversed?

• Yes, physical changes can be easily reversed.

• Physical changes are permanent and cannot be undone.

• Yes, physical changes can only be reversed with difficulty.

• No, physical changes cannot be reversed at all.

Can chemical changes be easily reversed?

• Yes, chemical changes can be easily reversed.

• Chemical changes can sometimes be reversed with effort.

• No, chemical changes cannot be easily reversed.

• Chemical changes are always reversible.