Question

for a gas at a given temperature, what is true about the speed of those gas molecules? the molecules move at a range of speeds; the lower the temperature, the wider the range. the molecules all move at the same speed; the greater the temperature, the slower the speed. the molecules move at a range of speeds; the greater the temperature, the wider the range. the molecules all move at the same speed; the greater the temperature, the greater the speed.

Explanation:

According to the kinetic - molecular theory of gases, gas molecules at a given temperature do not move at the same speed. They have a distribution of speeds. As the temperature increases, the average kinetic energy of the gas molecules increases, and the range of speeds becomes wider.

Answer:

The molecules move at a range of speeds; the greater the temperature, the wider the range.