Chemical and Physical Changes

What is the difference between a physical change and a chemical change?

• A physical change alters the chemical composition of a substance, while a chemical change does not.

• A physical change results in new substances being formed, while a chemical change does not.

• A physical change does not alter the chemical composition of a substance, while a chemical change results in new substances being formed.

• A physical change is reversible, while a chemical change is always irreversible.

Can a chemical change be undone?

• Yes, a chemical change can always be undone.

• No, a chemical change usually cannot be undone.

• Sometimes, a chemical change can be undone with the right conditions.

• Only certain chemical changes can be undone.

Can a physical change be undone?

• Yes, a physical change can often be undone. For example, ice can melt and then be refrozen.

• No, physical changes are permanent and cannot be reversed.

• Physical changes can only be undone under specific conditions.

• Physical changes are always reversible, unlike chemical changes.

Give an example of a chemical change.

• Copper roof changing color due to oxidation.

• Water boiling to form steam.

• Ice melting into water.

• Salt dissolving in water.

What is an example of a reversible physical change?

• Freezing water to make ice.

• Burning wood to ash.

• Dissolving sugar in water.

• Breaking a glass bottle.

What is a chemical change?

• A change that results in the formation of new chemical substances.

• A physical change that does not alter the chemical composition.

• A process that only involves the mixing of substances without any reaction.

• A change that can be easily reversed without any new substances formed.

What happens to the weight of matter during a physical change?

• The weight of matter increases due to energy absorption.

• The weight of matter decreases due to energy loss.

• The weight of matter stays the same during a physical change, as mass is conserved.

• The weight of matter fluctuates randomly during a physical change.

What is an indicator of a chemical change?

• Color change

• Physical state change

• Melting point change

• Density change

Is burning wood a physical or chemical change?

• It is a physical change because the wood remains wood.

• It is a chemical change because it produces new substances like ash and smoke.

• It is neither a physical nor a chemical change.

• It is a physical change because it can be reversed.

What is a physical change?

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

• A change that affects one or more physical properties of a substance without altering its chemical composition.

• A change that only occurs at high temperatures.

• A change that results in the formation of a new substance.