Whenever a molecule is oxidized, another molecule must be reduced. a. true b. false?

This is true, the number one rule for the topic Oxidation and Reduction is that when one is oxidized/reduced the other has to be oxidized/reduced accordingly, then only will the electrons will stay the same.

10.063g / 10.00 ml = 1.0063 g/ml which rounds off to 4 sig figs as: 1.006 g/ml