Review 7.1 pt. 2

Which of the following statements best describes why burning a match would be considered a

chemical reaction?

• The match gets consumed by the fire.

• Burning a match forms new substances.

• Burning a match is dangerous.

• Burning a match is not a chemical reaction.

Which is bigger, an atom or a grain of sand?

• The atom is bigger

• They are the same size

• The grain of sand is bigger

• It depends on the kind of atom

Which of the following is NOT made up of atoms?

• Heat

• A gas

• A cell

• A solid

Which statement about matter is TRUE?

• Atoms are not matter but they are contained in matter.

• Matter exists only when you can see it.

• Living things are not matter.

• Matter is made up of atoms.

A student has two different liquids in open jars. She pours the liquid from one jar into the other

jar, and she observes bubbles. After the bubbling stops, she finds that the total weight of the liquids

is now less than the total weight of the liquids before they were mixed together.

How can her observation be explained?

• Some atoms went into the air.

• Some atoms were destroyed.

• Some atoms became heavier.

• Some atoms became lighter.

A reaction occurs between two liquid substances in a sealed jar. What will happen to the mass of

the sealed jar and its contents after the reaction occurs?

• The mass will change if a gas is formed, and it will change if a solid is formed.

• The mass will change if a gas is formed, but it will not change if a solid is formed.

• The mass will change if a solid is formed, but it will not change if a gas is formed.

• The mass will not change if a gas is formed, and it will not change if a solid is formed.