May 16 & 17 SL P1A

Which equation represents sublimation?

For which compound is the empirical formula the same as the molecular formula?

Ar (H) = 1; Ar (C) = 12; Ar (O) = 16

Which compound has the greatest percentage by mass of nitrogen atoms?

Which statements about mixtures are correct?

I. The components may be elements or compounds.

II. All components must be in the same phase.

III. The components retain their individual properties.

In which mixture is NaOH the limiting reagent?

5.0 cm³ of 2.00 mol dm⁻³ sodium carbonate solution, Na₂CO₃(aq), was added to a volumetric flask and the volume was made up to 500 cm³ with water. What is the concentration, in mol dm⁻³, of the solution?

What is the expression for the volume of hydrogen gas, in dm³, produced at STP when 0.30 g of magnesium reacts with excess hydrochloric acid solution?

Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g)

(Molar volume of an ideal gas at STP = 22.7 dm³mol⁻¹)

Why do gases deviate from the ideal gas law at high pressures?

In which set do all the species contain more electrons than neutrons?

Which electron transition in the hydrogen atom emission spectrum emits radiation with the longest wavelength?