Velocity tells you how fast and in what direction. Speed only tells how fast.
Answer:E. Hydrogen was able to participate in an exergonic reaction and carbon dioxide couldn't
Explanation:
An exergonic reaction releases energy to the environment. The combustion of hydrogen contained in the balloon is a chemical reaction. The reaction can take place because hydrogen combines with oxygen in air, that is, the gas is combustible. CO2 does not support combustion, it does not combine with oxygen in air and it is also denser than air, hence does not participate in the exergonic reaction.
Have them give up there phone for 15 minutes
talk to them when there in a good mood
watch a movie then have a disscution about it