Physical and Chemical Changes

What is the definition of a physical change?

• A physical change is a change in which the form of matter is altered and a new substance is created.

• A physical change is a change in which matter disappears completely.

• A physical change is a change in which the state of matter remains the same.

• A physical change is a change in which the form of matter is altered but one substance is not transformed into another different substance.

What is the definition of a chemical change?

• A chemical change is a process that can be easily reversed.

• A chemical change is a process that involves a change in color only.

• A chemical change is a process that does not involve any substances.

• A chemical change is a process in which one or more substances are converted into different substances with different properties.

Give an example of a physical change.

• Burning paper into ashes

• Boiling water into steam

• Freezing water into ice cubes

• Melting ice into water

Provide an example of a chemical change.

• Wood burning

• Water boiling

• Sugar dissolving

• Iron rusting

How can you distinguish between physical and chemical changes?

• Physical changes involve a change in color, while chemical changes do not

• Physical changes can be reversed by physical means, while chemical changes cannot be easily reversed.

• Physical changes occur spontaneously, while chemical changes require a catalyst

• Physical changes always involve a change in state, while chemical changes do not

Explain the effects of physical changes.

• Physical changes do not affect the state of matter

• Physical changes can include changes in state (solid, liquid, gas), changes in shape or size, changes in texture, changes in color, and changes in density.

• Physical changes cannot alter the texture of a substance

• Physical changes only involve changes in color

Explain the effects of chemical changes.

• Chemical changes result in the formation of new substances with different properties.

• Chemical changes always lead to the destruction of substances.

• Chemical changes do not result in the formation of new substances.

• Chemical changes have no impact on properties of substances.

Name another example of a physical change.

• Burning wood

• Boiling water

• Melting ice

• Freezing water

Name another example of a chemical change.

• Burning wood

• Melting ice

• Mixing salt and water

• Boiling water

Why is it important to understand physical and chemical changes?

• It helps us comprehend the transformations matter undergoes.

• Physical and chemical changes do not impact the environment.

• Understanding changes in matter is irrelevant.

• It has no practical applications in real life.