Day 1  Day 2  Day 3  Day 4  Day 5  Day 6

Day 1

Question 1

Magnesium reacts with oxygen to form magnesium oxide: 2Mg + O₂ → 2MgO. What mass of magnesium oxide is produced from 24 g of magnesium? (Aᵣ: Mg=24, O=16)

Day 2

Question 1

What mass of oxygen is needed to react completely with 56 g of nitrogen to form nitrogen monoxide, N₂ + O₂ → 2NO? (Aᵣ: N=14, O=16)

Day 3

Question 1

Calculate the mass of sodium carbonate, Na₂CO₃, needed to make 250 cm³ of a 0.2 mol/dm³ solution.

Day 4

Question 1

25.0 cm³ of a 0.100 mol/dm³ sodium hydroxide solution is neutralised by 20.0 cm³ of hydrochloric acid. Calculate the concentration of the acid in mol/dm³. (NaOH + HCl → NaCl + H₂O)

Day 5

Question 1

In a titration, 25.0 cm³ of a 0.050 mol/dm³ silver nitrate solution reacted exactly with 10.0 cm³ of a sodium chloride solution. Calculate the concentration of the sodium chloride in g/dm³. (AgNO₃ + NaCl → AgCl + NaNO₃) (Aᵣ: Na=23, Cl=35.5)

Day 6

Question 1

A student heats 4.96 g of hydrated copper(II) sulfate​​ (CuSO4.xH2O), which loses mass to form 3.20 g of anhydrous copper(II) sulfate. Calculate the formula of the hydrated salt. (Aᵣ: Cu=63.5, S=32, O=16, H=1)