Describe an example of a chemical change.

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?