A Work - Conservation of Matter

Which of the following is the best definition of dissolve?

• The melting of a solid into a liquid

• When one substance breaks down into another substance

• When water is used to liquify a solid

• When a solid and a liquid substance are separated

What is a synonym for the word molten, used in paragraph 6?

• liquid

• hardened

• magnetic

• dissolved

Which of the following objects is a malleable metal?

• A glass bead

• A copper coin

• A plastic toy boat

• A rock

Which of the following is not an example of a physical change?

• Salt dissolving in water

• Plastic being melted into a liquid

• Paper being burned into ash

• Water being boiled and creating steam

Which of the following is not a state of matter?

• solid

• liquid

• gas

• energy

Which of the following is not true about the conservation of matter? (check all that apply)

• Boiling is not a physical change.

• Changing the state of matter does not change the amount of matter.

• Physical changes cannot change volume.

• Matter cannot be created or destroyed.

• Matter can be solid, liquid, or gas.

1. Explain how melting wax is a physical change and that matter is conserved

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Conservation of matter means _________.

• matter can never be destroyed, but it can be changed

• matter turns into energy

• Mass can be created and destroyed.

Look at the picture. Which beaker represents the molecules of a solid?

In the image are two nails before and after they were left out in the rain. Click on the nail that chemically changed due to the rain.