Physical and Chemical Change Intro

What defines a physical change?

• A new substance is created.

• Chemical bonds are formed or broken.

• Only the appearance of the substance changes.

• It always involves an explosion.

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

• Burning wood

• Mixing salt and water

• An explosion

• A change in odor

What is a key characteristic of a chemical change?

• It only alters the appearance of a substance.

• It involves breaking or making chemical bonds between atoms.

• The original substance can easily be recovered.

• It never produces a change in temperature.

Which of these is NOT an indicator of a chemical change?

• Burning

• A change in color

• A phase change (e.g., melting ice)

• Bubbles or fizzes