Physical and Chemical Changes/Density

In this example, what is the evidence a chemical change has occurred?

• volume is increased

• no energy is released

• gas is being released

• a precipitate has formed

Bubbles form when water boils. Is this evidence of chemical change?

• Yes, because water is changing.

• Yes, because the water is reacting.

• No, because the vapor is still water.

• No, because water doesn't react with anything.

Wood is chopped into small pieces. Then, it is burned to cook food. This is an example of a ____ change followed by a ____ change.

• chemical, physical

• physical, chemical

• physical, physical

• chemical, chemical

Which of the following is a chemical property?

• volume

• magnetism

• temperature

• reactivity

How is a chemical change different from a physical change?

• there is no difference

• a physical change creates a new substance

• a chemical change creates a new substance

Is burning wood a chemical or physical change?

• chemical
• physical

Is glass breaking a chemical or physical change?

• chemical
• physical

Is a a rusting bicycle a chemical or physical change?

• chemcial
• physical

Is melting ice a chemical or physical change?

• chemical
• physical

Salt dissolves in water

• physical Change
• chemical change