When a solution of nitric acid is added to a to solution of calcium hydroxide, the salt formed has what formula?

Nitric acid and calcium hydroxide react to form calcium nitrate and water.

The molecular equation is as follows:

2HNO3 (aq) + Ca(OH)2 (aq)  = Ca(NO3)2 (aq) + 2H2O (l)

So the formula of calcium nitrate, the salt formed in this reaction is Ca(NO3)2 .

Water here seem to be the only real product. It is formed from the OH+  of the hydroxide and the H+ of the acid which combine to form two water molecules.

Calcium and Nitrate ions remain unchanged before and after the reaction and are thus known as spectator ions.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

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".