Which colligative property is employed when coolant is added to a car's radiator to keep it from overheating? O vapor-pressure lowering
O boiling-point elevation
O freezing-point depression

It would be true sodium reacts with water in a violent way 

Answer///precipitate;

We first assume that this gas is an ideal gas where it follows the ideal gas equation. the said equation is expressed as: pv = nrt. from this equation, we can predict the changes in the pressure, volume and temperature. if the volume and the temperature of this gas is doubled, then the pressure still stays the same.

Well you can immediately rule out a and d because if a metal were to lose or gain protons, then it would become a different element all together. the answer here is b because the positive symbol with a number refers to how many electrons the metal can give away to become stable.