An atom has a negative charge. which of the following must have occurred?

a)it lost a neutron.
b)it lost an electron.
c)it gained a proton.
d)it gained an electron.

After cloud droplets form, what must happen to them for precipitation to occur?

Match the acid base pairs by arranging the acid name with the conjugate base formula. hydrogen carbonate hydrogen phosphate carbonic acid read water sulfuric acid phosphoric acid a. co32- b. hso4- c. hco3- d. po43- e. h2po4- f. oh-

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.