Chemistry Past Questions and Answers

Which of the following will have its mass increased when heated in air?

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
From the equation above, the mass of magnesium required to react with 250cm3 of 0.5M HCl is
[Mg = 24]

A gaseous metallic chloride MCl_x consists of 20.22% of M by mass. The formula of the chloride is
[M = 27, Cl = 35.5]

In which of the following are water molecules in the most disorderly arrangement?

In order to remove one electron from a 3S orbital of gaseous sodium atom, about 496KJMol^-1 of energy is required. This energy is referred to as