Matter Unit Review

Which of these objects are nonmagnetic?

(You may choose more than one answer.)

• iron nail

• wooden spoon

• aluminum foil

• plastic spoon

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Which of these substances are soluble in water?

(You may choose more than one answer.)

• sand

• sugar

• cinnamon

• salt

You mix baking soda and vinegar. Bubbles form, and the mixture now weighs less. Why did that happen?

• It evaporated.

• It melted.

• The weight changes in a chemical reaction.

• A gas formed and escaped.

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After you melt some chocolate,

• the weight will increase.

• the weight will decrease.

• the weight will stay the same.

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Why would a metal bench outside burn you?

• Metal is an electrical insulator.

• Metal is an electrical conductor.

• Metal is a thermal conductor.

• Metal is a thermal insulator.

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Why would you not burn your hand on a rope on the playground?

• Rope is an electrical insulator.

• Rope is an electrical insulator.

• Rope is a thermal insulator.

• Rope is a thermal conductor.

Why can't you see salt in water?

• The salt melts in the water.

• The salt is soluble in water, so it dissolves.

• The water is not soluble in water, so it dissolves.

• The salt no longer exists.

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How could you prove water has salt dissolved in it?

• Look at the water carefully.

• Heat the water so it evaporates and the salt is left behind.

• Heat the water and look for bubbles.

• Pour the water through a something with holes in it.

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How could you calculate the weight of a mixture of different types of juice?

• Weigh the ingredients and subtract the weights.

• Weigh the ingredients and add the weights.

• Heat the juice, so it evaporates.

• Use a triple beam balance.

What provides the best evidence that air is made of matter?

• measuring the temperature of air

• comparing the volume of an empty balloon and an inflated balloon

• measuring how long it takes air to escape a balloon

• finding the volume of air in spaces by pouring water into the spaces