How does an odor get from a source to your nose?

• It moves around the container and stays there. We need to be close to the container to smell the odor.
• It travels through the air. When it gets to our noses, we smell it as we take in air.
• The odor radiates outward from the source in straight lines in all directions.
• The odor moves from object to object until it reaches your nose.

Why does it make a difference if the lid is on or off the container?

• The lid kept the smell from moving.
• The odor can go through the lid.
• With the lid on, the odor must go through the sides of the container.
• With the lid off, the odor can reach just above where the lid would be.

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 is absent today that air has mass? (MS-PS1-1)

• 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 measured the mass of a ball when it was inflated and when it was deflated. We found that the mass of the inflated ball was more than the mass of the deflated ball.
• I would say that the pump has mass, so it made the ball have more mass.
• I would say that the ball is bigger when inflated, so the air must have mass.

The liquid and the wooden block take up space. Was anything taking up space in the plastic bowl before the liquid was poured in? If so, what was taking up the space? (MS-PS1-1)

• Nothing was in the plastic bowl.
• Air was taking up the space.
• There was a vacuum in the plastic bowl.
• Air took up part of the space but left space for the liquid to be poured in.

Think about the plastic bag with air. What is in the bag? Does air also take up space? (MS-PS1-1)

• Air was in the bag and it takes up space.
• Nothing was in the bag.
• There was a vacuum in the bag.
• Air was in the bag, but it doesn’t take up space.

What about the air around you? What space is it “taking up”? (MS-PS1-1)

• The air around me is taking up space in the room.
• The air around me is not taking up space.
• The air around me is taking up some space but leaves gaps for more things to come near me.
• The air around me takes up space, but only up to a certain height.

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: a. Air does not have mass because the bag does not feel heavy. b. Air does not have mass because the air keeps moving around. c. Since I cannot actually measure it, air cannot have mass. d. Air has mass, but it is probably very, very small. Which of these answers do you agree with? Explain your ideas. (MS-PS1-1)

• OptiI agree with letter a. The bag is not heavy, so air does not have mass.
• I agree with letter b. The air is moving around, so it doesn’t have mass.
• I agree with letter c. Air can’t have mass since I can’t measure it.
• I agree with letter d. Our evidence when we filled up the ball with air shows that air has mass since the ball had more mass when air was added. The mass was not much, but it still was an increase.

How did the demonstration that your teacher did with the empty flask provide evidence that air takes up space? (MS-PS1-1)

• Air does not take up space.
• The air went into the flask through the first hole when the clamp was on the tube.
• The air did not go into the flask through the first hole when the clamp was on the tube because the air in the flask took up all the space.
• The air did not go into the flask through the first hole when the clamp was on the tube because the hole was too small.

Imagine three 2L metal bottles. One of the containers is completely full of oxygen gas, one is half-full, and one is completely empty. All three containers look the same. Which investigation would help you to determine which container is full of gas, which is half-full, and which is empty? Explain the results that you would get with your investigation. (MS-PS1-1)

• I would pick up the bottles and shake them to see which one had the most oxygen. Since oxygen has mass, the one with the most oxygen would be the easiest to shake.
• I would find the mass of each metal bottle. The one with the most mass would be the container that is full, the one with the least mass would be the one that is empty. The one that is in the middle would be half-full. Since oxygen has mass, the one with the most oxygen would have the most mass.
• I would find the mass of each metal bottle. The one with the most mass would be the container that is empty, the one with the least mass would be the one that is full. The one that is in the middle would be half-full. Since oxygen has mass, the one with the most oxygen would have the most mass.
• I would find the mass of each metal bottle. The one with the most mass would be the container that is half-full, the one with the least mass would be the one that is full. The one that is in the middle would be full. Since oxygen has mass, the one with the most oxygen would have the most mass.