What does the kinetic theory state about the relationship between the speed and temperature of gas molecules?
a. as the temperature increases, the speed of gas molecules remains constant.
b. as the temperature increases, the speed of gas molecules decreases.
c. as the temperature increases, the speed of gas molecules increases.
d. as the speed of gas molecules increases, the temperature becomes constant.
e. as the temperature decreases, the speed of gas molecules increases.

C. As the temperature increases, the speed of gas molecules increases.

Explanation:

one of the main 4 postulates of  kinetic theory of gases is the relationship between the speed and temperature of gas molecules.

The speed of the molecules in a gas is proportional to the temperature and is inversely proportional to molar mass of the gas. In other words, as the temperature of a sample of gas is increased, the molecules speed up and the root mean square molecular speed increases as a result.

So, the right choice is:

C. As the temperature increases, the speed of gas molecules increases.

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alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".