How many grams of Cu will be produced if 15.8 grams of Cu2S got consumed? Cu2 S + O2 + 2Cu + SO2
6.31 g
79.1 g
none of the choices
12.6 g
39.6 g

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

Anitrogen atom and an oxygen atom combine chemically to form nitric oxide. what is nitric oxide?