Chemistry Past Questions and Answers

Which of the following correctly explains why iodine crystals change directly into the gaseous state when heated?

Which of the following is a waste product in the Solvary Process for the manufacture of sodium trioxocarbonate (IV)?

When copper (ll) chloride solution is treated with excess aqueous ammonia, a deep blue solution results This is due to the presence of

The complex salt formed when aluminium dissolves in sodium hydroxide solution is

The reaction represented by the equation C_(s) + H₂O_(l) → CO_(s) + H _2(s) was carried out at 27_oC if the enthalpy change was + 4500 J and the entropy change was + 12J, what was the free energy change? (∆G = ∆H - T∆S)