What is a physical change in chemistry?

• A process that always forms a new substance

• A reaction that rearranges particles to create a new substance

• Something that changes the physical properties of a substance, like size, shape, or form

• A change that cannot be undone

Cutting a piece of cloth is an example of a physical change because:

• It creates a new substance with different chemical properties.

• It changes the cloth's shape and size but not its chemical composition.

• It releases heat and light during the process.

• It is an irreversible process.

Which of these is an example of a physical change?

• Metal rusting

• Fruit ripening

• Fireworks exploding

• Melting ice

When ice melts into water and then evaporates into steam, what type of change is occurring?

• A chemical change, as new substances are formed.

• An irreversible change, as the original form cannot be recovered.

• A physical change, as the substance remains water in different states.

• A decomposition reaction, breaking down the substance.

Which characteristic is often associated with physical changes?

• They always produce a new substance.

• They are always irreversible.

• They can often be undone.

• They always release light and heat.

Dissolving sugar into water is considered a physical change because:

• The sugar and water combine to form a new chemical compound.

• Heat is always absorbed during the dissolving process.

• The sugar and water can be separated from each other.

• The sugar changes its chemical structure when dissolved.

Baking cookies from dough is an example of what type of change?

• A physical change, as the ingredients are just mixed.

• A reversible change, as the cookies can be turned back into dough.

• A chemical change, due to the absorption of heat, change in color, and release of gases.

• A state change, as the dough becomes solid.

Which statement is generally true about chemical changes?

• They can always be undone.

• They usually cannot be undone.

• They only involve changes in physical appearance.

• They never involve a change in temperature.

What defines a chemical change?

• A change that only alters the size or shape of a substance.

• A reaction that rearranges the particles of two or more substances to create at least one new substance.

• A process where a substance changes its state of matter.

• A change that can always be easily reversed.

When wood burns, it is transformed into a new substance. What is this new substance called?

• Smoke

• Water vapor

• Ash

• Charcoal