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If you keep a gas's temperature constant, how would you increase the volume of the gas?

a
You would increase the pressure
b
You would change the temperature
c
You would decrease the temperature
d
You would decrease the pressure
Question 13
Which of Newton's Laws does the following scenario describe?

My car hits a mosquito, and the mosquito hits back, equally.

a
1st Law
b
2nd Law
c
3rd Law
Question 14
A radioisotope has a half-life of 7.5 hours. How many half lives have occured after 67.5 hours?

a
7 half-lives
b
8 half-lives
c
9 half-lives
d
10 half-lives

1 answer

For the questions provided:

Question 12: If you keep a gas's temperature constant, how would you increase the volume of the gas?

  • The correct answer is d - You would decrease the pressure. This is in accordance with Boyle's Law, which states that pressure and volume of a gas are inversely related when temperature is held constant.

Question 13: Which of Newton's Laws does the following scenario describe? "My car hits a mosquito, and the mosquito hits back, equally."

  • The correct answer is c - 3rd Law. This describes Newton's Third Law of Motion which states that for every action, there is an equal and opposite reaction.

Question 14: A radioisotope has a half-life of 7.5 hours. How many half-lives have occurred after 67.5 hours?

  • To find out how many half-lives have occurred, divide the total time by the half-life. \[ \frac{67.5 \text{ hours}}{7.5 \text{ hours/half-life}} = 9 \text{ half-lives} \]
  • The correct answer is c - 9 half-lives.

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