Changing Matter

What is a physical change?

• A physical change is a change in which the temperature of matter remains constant.

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

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

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

Give an example of a physical change.

• Boiling water into steam

• Burning paper

• Freezing water into ice

• Melting ice into water

What is a chemical change?

• A chemical change is a process where substances are transformed into different substances with the same properties.

• A chemical change is a process where one or more substances are transformed into different substances with new chemical and physical properties.

• A chemical change is a process where substances are transformed into different substances with new physical properties only.

• A chemical change is a process where substances remain the same but change color.

Provide an example of a chemical change.

• Iron rusting

• Water boiling

• Wood burning

• Sugar dissolving

How can you reverse a physical change?

• By ignoring the change and hoping it reverses on its own

• By adding more of the substance that caused the change

• By applying a process that can revert the change back to its original state.

• By performing a completely unrelated action

Can you reverse a chemical change? Why or why not?

• Chemical changes are always reversible.

• Yes, you can reverse a chemical change.

• Chemical changes can be undone easily.

• No, you cannot reverse a chemical change.

What are some indicators of a chemical change taking place?

• Change in shape

• Change in texture

• Change in volume

• Color change, formation of a precipitate, evolution of gas, temperature change, and production of light.

Explain the difference between physical and chemical changes.

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

• Physical changes involve a change in the chemical composition of a substance, while chemical changes do not.

• Physical changes are always accompanied by a change in color, while chemical changes are not.

• Physical changes are reversible, while chemical changes are irreversible.

Why is it important to understand the difference between physical and chemical changes?

• Understanding physical and chemical changes has no practical applications

• It helps in distinguishing how substances transform without altering their chemical composition (physical changes) versus when they undergo a change in chemical composition (chemical changes).

• Physical changes always involve a change in chemical composition

• Chemical changes only occur in laboratory settings

How do physical and chemical changes impact our daily lives?

• Physical and chemical changes impact our daily lives through gardening and pet care.

• Physical and chemical changes impact our daily lives through skydiving and bungee jumping.

• Physical and chemical changes impact our daily lives through knitting and painting.

• Physical and chemical changes impact our daily lives through cooking, cleaning, transportation, and medicine.