Given the reaction: Ca(s) + Cu2+(aq) - Ca2+(aq) + Cu(s) What is the correct reduction half-reaction?
1.
Cu2+ (aq) + 2e - Cu(s)
2.
Cu2+(aq)
-
Cu(s) + 2e
3.
Cu(s) + 2e - Cu2+ (aq)
4.
Cu(s) - Cu2+ (aq) + 2e-

a basic solution is an aqueous solution containing more oh-ions than h+ions. in other words, it is an aqueous solution with a ph greater than 7. basic solutions contain ions, conduct electricity, turn red litmus paper blue, and feel slippery to the touch.

explanation:

i think it is d. e because the next one is igneous.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.