Understanding Physical and Chemical Changes

What is a key characteristic of a physical change?

• It results in the formation of a new substance.

• It is often reversible.

• It involves a change in chemical identity.

• It always produces a gas.

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

• Melting ice into water

• Dissolving sugar in water

• Burning wood

• Sanding a piece of wood

What happens to the chemical structure of water when it freezes into ice?

• It changes to form a new substance.

• It remains the same.

• It forms new chemical bonds.

• It becomes a gas.

Which indicator suggests a chemical change has occurred?

• Change in texture

• Change in shape

• Production of gas

• Change in state

What is a common method to identify whether a change is physical or chemical in educational settings?

• By observing temperature changes only

• By predicting and observing changes in solids and liquids

• By measuring the weight of substances

• By checking the color of substances only