Which half-reaction correctly represents reduction? OA) Ca2+ - Ca + 2e-

OB) Ca2+ + 2e-

Ca

O C)2 F- + 2e- - F2

OD) 2F- - F2 + 2e-

B. Ca2+   +  2e- >   Ca

Explanation:

Reduction involves the gaining of electrons as well as a decrease in the oxidation state of the atom or ion.

In this case; Ca2+ gains two electrons and the oxidation state is reduced from +2 to  0.

Ca2+   +  2e- >   Ca

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:

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante