19 questions in Formulae, equations and moles at Form 5 · BGCSE
Most triedMost missedNewest- How many moles are in 36 g of water? (H = 1, O = 16)
- What volume does 1 mole of any gas occupy at room temperature and pressure?
- What is the concentration of 0.5 mol of NaOH dissolved in 250 cm³ of solution?
- Calcium carbonate decomposes when heated: CaCO₃ → CaO + CO₂. (Ca = 40, C = 12, O = 16)
- Answer the following.
- A 10 g sample of impure iron(II) sulphate, FeSO₄, was dissolved in water to make 250 cm³ of solution. Exactly 25.0 cm³ of the solution was titrated w…
- The equation for the production of ethanol by the addition of steam to ethene is shown (CH₂=CH₂ + H–O–H → CH₃CH₂OH). Bond energies (kJ/mol): C–H 412;…
- Petrol is a mixture of hydrocarbons. C₅H₁₂ is one of the hydrocarbons in petrol. It burns in oxygen: C₅H₁₂ + 8O₂ → 5CO₂ + 6H₂O. The table shows bond …
- Waste water from a cotton manufacturing company contains a mixture of sulphuric acid, iron(II) sulphate and calcium oxide. A 10.0 cm³ sample of waste…
- A mixture of solids at Sua pan contains anhydrous sodium carbonate. To determine its percentage purity, 8 g of the mixture was dissolved in water and…
- In an experiment to determine the formula of a compound of iron and chlorine, chlorine gas was passed over heated iron. Mass of empty glass tube = 11…
- The compound borazine was first made over 90 years ago. It was thought to have the structure shown (a six-membered ring of alternating B and N atoms,…
- Another product of the corrosion of bronze is basic copper(II) carbonate, xCu(OH)₂.yCuCO₃. It is heated in the apparatus shown: CuCO₃ → CuO + CO₂ and…
- The equation shows the reaction of one mole of methane with two moles of oxygen: CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g). The bond energies are given in t…
- An experiment was done to determine the percentage of calcium carbonate, CaCO₃, in a sample of limestone rock. 4.0 g of the crushed rock was added to…
- Excess magnesium was added to 25.0 cm³ of dilute hydrochloric acid: Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g). The hydrogen produced was completely reacte…
- Hazel reacted 25.0 cm³ of a 2.0 mol/dm³ hydrochloric acid solution with 2.0 g of an unknown carbonate of formula XCO₃. She titrated the resulting mix…
- Match each definition to the correct term: deliquescent, hygroscopic, exothermic, hydrolysis, oxidation, recycling. One has been done for you: the lo…
- A substance used to clean false teeth contains potassium percarbonate, K₂C₂O₆. (Ar: K 39, C 12, O 16)