Need help with 7 questions I'll give 26 points for the best answer!!

1. A superconductor performs best at ___.

extremely high temperatures

room temperature

very cold temperatures

any temperature

2. Which of the following is most likely to be the best conductor of electricity?

oxygen

chlorine

aluminum

chromium

3. Which of the following is likely the best electrical insulator?

carbon

silicon

aluminum

oxygen

4. Which of the following is likely to have the lowest viscosity?

hot oil

room temperature oil

room temperature water

below room temperature oil

5. A process used to separate liquid solutions is _.

diffusion

adhesion

distillation

cohesion

6. In the metric system, the appropriate unit for weight is the ___.

gram

newton

newton/cm2

gram/cm3

7. The acceleration due to gravity on Pluto is less than that on the Earth. The mass of a person on Pluto will be.

greater

the same

less

Superconductors perform best at very cold temperatures because resistivity of this kind of materials decays drastically with temperature.
Chromium is most likely to be the best conductor of electricity because it belongs to the Transition Metal group of the periodic table.
Oxygen is likely to be the best electrical insulator because it belongs to the Non Metal group, and is mostly found in gas state.
Water has lower viscosity than any oil at any temperature.
Distillation is a separation procedure that uses the difference of boiling points of two mixed liquids, evaporating one of them by heating the mix at an intermediate temperature, right between both boiling points.
Since weight is a force it must be measured in newtons.
Mass is the measurement of the amount of particles in a body. Since moving a body doesn't change its amount of particles, then the mass will be the same here and there.