1. In-video question at time point 07:23

Make a prediction: which gas is filling these balloons?(It's going to tell you that your answer is correct no matter which answer you pick, because this is a prediction. Please continue with the video to see which answer is REALLY correct.)

a). both balloons are filled with heliumb). both balloons are filled with hydrogenc). the one on of the left is filled with helium, and the other one is filled with hydrogend). the one on the left is filled with hydrogen, and the other one is filled with helium

2. In-video question at time point 04:04

Which length is longer: a yard or a meter?

a). meterb). yard

3. In-video question at time point 04:27

Which distance is longer: a mile or a kilometer?

a). kilometerb). mile

4. In-video question at time point 05:11

Which mass is heavier: a milligram or a microgram?

a). milligramb). microgram

5. In-video question at time point 06:28

Please select all that apply for the following chemical: F2. Check all apply.

a). atomb). elementc). moleculed). compound

6. In-video question at time point 06:29

Please select all that apply for the following chemical: C9H8O4

a). atomb). elementc). moleculed). compound

7. In-video question at time point 14:00

What will happen when the negative pole of the magnet in the air approaches the negative pole of the magnet on the table?

a). the magnet on the table will move away from the magnet in the airb). the magnet on the table will jump up to stick to the magnet in the airc). nothing

8. In-video question at time point 14:23

What will happen when the positive pole of the magnet in the air approaches the negative pole of the magnet on the table?

a). the magnet on the table will move away from the magnet in the airb). the magnet on the table will jump up to stick to the magnet in the airc). nothing

9. In-video question at time point 08:57

How many moles of nitrogen atoms are needed to build 0.75 moles of nitrous acid molecules?

a). 602,000,000,000,000,000,000,000 molesb). 0.38 molesc). 1.5 molesd). 0.75 moles

10. In-video question at time point 10:47

How many moles of oxygen atoms are needed to build 5 moles of Ca(NO3)2 molecules?

a). 5 molesb). 10 molesc). 30 molesd). 50 moles