Matter and Energy Review Part 1

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Over time, iron becomes rust when it combines with water and oxygen. Which type of change must occur for rust to form?

• chemical
• mechanical
• nuclear
• physical

A family goes camping and creates a fire to roast marshmallows. The next morning, the kids notice that the logs are no longer there, and all that remains are ashes. Which best explains why the ashes from a log are evidence of a chemical change?

• The color of the wood changed from brown to gray. 
• The wood breaks down into smaller matter when burned.
• The ashes cannot be put back together to create a log again.
• Something was added to the log, and it cannot be removed. 

Which is a chemical change?

• frying an egg
• boiling water
• breaking a glass cup
• crushing a piece of bread

Which best explains why melting ice is a physical change instead of a chemical change?

• It does not smell bad.
• It changes from a solid to a liquid.
• It does not form a new substance.
• It changes quietly with no loud sound.

Which is a physical change involving an egg?

• frying an egg
• boiling an egg
• breaking an egg

Kim lost her hammer outside. When she found it a few months later, some parts of the metal were covered with flaky, brown rust. Which type of change occurred when rust formed on the hammer?

• chemical
• electrical
• thermal
• physical