Would extra mass in the crucible cause the mass of oxygen to come out too high or too low

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

Compared with the freezing-point depression of a 0.01 m c6h12o6 solution, the freezing-point depression of a 0.01 m nacl solution is

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc