Click all the options that are sources of heat. A. A jacket

B. Stove

C. Rubbing hands together

D. Light Bulb

Plz answer asap

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?