7th Grade Test 2 - How can I smell things from a distance?

How does an odor get from a source to your nose? Choose the BEST answer.

• It moves around inside the container and stays there.

• It travels through the air. When it gets to our noses, we smell it as we breathe in air.

• The odor radiates outward from the source in straight lines.

• The odor moves from object to object until it reaches your nose.

Tags

NGSS.MS-LS1-8

What does it mean that an odor got out of the container?

• It moved into the air in the room from the container.

• It stays in the container.

• It moved in a straight line through the container opening.

• It hovers just above the container opening.

Think back to the activity with the ball. How would you convince someone who was absent that day that air has mass? Choose the best explanation.

• I would say that the air goes into the ball, so it must have mass.

• I would say that we can tell that air has mass because we found that the mass of the inflated ball was more than the mass of the deflated ball. The only difference was the amount of air, so the extra mass shows that air has mass.

• I would say that the pump has mass, so it made the ball have more mass. The increase in mass that made the inflated ball heavier than the deflated ball came from the pump, not the air.

• I would say that the ball is bigger when inflated, so the air must have mass. When we inflated the ball the air filled up the space inside. This made the ball bigger.

Imagine that you pour liquid into a container, you can see it takes the space. Was anything taking up space in the container before the liquid was poured in? If so, what was taking up the space?

• Nothing was in the container, it was empty.

• Air was taking up the space. The liquid pushed the air out.

• There was a vacuum in the open container.

• Air took up part of the space but left space for the liquid to be poured in.

Tags

NGSS.5-PS1-1

Students in another science class had a sealed plastic bag full of air. The students had to decide whether the air in the bag had mass. Here are the answers that four students wrote:

• Air does not have mass because the bag does not feel heavy.

• Air does not have mass because the air keeps moving around.

• Since the classroom scale is not sensitive enough to measure it, air cannot have mass.

• Air has mass, but it is probably very, very small. With enough air and the right tools it can be measured.

If you found two identical oxygen tanks, but one was heavier than the other the best explanation would be...

• The heavier tank has more compressed oxygen.

• The lighter tank has more compressed oxygen.

• The tanks have the same amount of oxygen.

• The heavier tank is a different kind of oxygen.

Which tool would be best to help you determine the mass of an object?

• a ruler

• a measuring cup

• a scale

• a calculator

Which tools could help you determine the volume of an object?

• a meter stick

• a measuring cup

• a graduated cylinder

• a scale

Particles from an odor source change into a gas before traveling through the air.

• True

• False

Tags

NGSS.MS-PS1-4

Water goes through a chemical change to form ice.

• True

• False

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5