How many seconds are required to deposit 0.211 grams of copper metal from a solution that contains Cu2+ ions, if a current of 0.508 A is applied?

Type the letter that represents the correct location for each particle type below.

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?

The identities of substances are the same before and after which type of change