GCE Chemistry 2019
Past Questions
21+ verified 2019 GCE Chemistry practice questions with Worked answers.
Start practicing 2019 questions →2019 GCE Chemistry questions
How many lone pairs of electrons are present on the central atom in a molecule of water, H₂O?
What is the percentage by mass of nitrogen in ammonium trioxonitrate(V), NH₄NO₃? [H = 1, N = 14, O = 16]
Which of the following properties is NOT characteristic of a liquid?
The pressure of a gas in a cylinder is 4.0 × 10⁵ Pa at 27°C. If the temperature is raised to 127°C at constant volume, what is the new pressure of the gas?
At constant temperature, the pressure of a gas is doubled. What happens to its volume?
A gas occupies 300 cm³ at 17°C and 1.0 × 10⁵ Pa. Calculate the volume of the gas at STP (0°C and 1.013 × 10⁵ Pa).
The conjugate base of the hydrogen sulphate ion, $\text{HSO}_4^-$, is
Using the data below, calculate the standard enthalpy of formation of methane, CH₄(g). C(s) + O₂(g) → CO₂(g), ΔH = −394 kJ mol⁻¹ H₂(g) + ½O₂(g) → H₂O(l), ΔH = −286 kJ mol⁻¹ CH₄(g) + 2O₂(g) → CO₂(…
For the reaction $PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)$, if the value of $K_c$ at a given temperature is very large (e.g. $K_c \gg 1$), this indicates that at equilibrium
At 500 K, the equilibrium constant $K_c$ for the reaction $A(g) + B(g) \rightleftharpoons C(g) + D(g)$ is 0.040. If the initial concentrations of A and B are each $1.0\,mol\,dm^{-3}$ and no C or D are…
Which of the following is the correct IUPAC name for CH₃CH₂CH(CH₃)CH₂OH?
A hydrocarbon has the molecular formula C₄H₈. Which of the following classes of compounds could it belong to?
A sample of impure zinc was dissolved in excess dilute sulphuric acid. The resulting solution was made alkaline with excess sodium hydroxide solution. The precipitate that dissolved in excess NaOH was…
a) State the Aufbau principle and use it to write the electronic configuration of the following elements: i) Calcium (Ca, Z = 20) ii) Iron (Fe, Z = 26) iii) Chlorine (Cl, Z = 17) b) i) Defin…
a) i) Explain what is meant by the term 'isotopes', giving TWO examples with their nuclide symbols. ii) Carbon has two stable isotopes: carbon-12 (abundance 98.89%) and carbon-13 (abundance 1.11%).…
(a) Define the term 'mole' as used in chemistry. (2 marks) (b) Calculate the number of moles of atoms present in 9.0 g of aluminium. [Al = 27] (2 marks) (c) Calcium carbonate decomposes on heating acc…
a) i) State TWO general properties of bases. ii) Distinguish between a strong acid and a concentrated acid, giving one example of each. b) Copy and complete the table below for the following sa…
a) Define the following terms as used in electrochemistry: i) Oxidation ii) Reduction iii) Standard electrode potential b) The following standard electrode potentials are given: Zn²⁺(aq)/…
a) i) What is meant by the term 'redox reaction'? ii) Using the reaction between iron(III) ions and iodide ions as an example: 2Fe³⁺(aq) + 2I⁻(aq) → 2Fe²⁺(aq) + I₂(aq) Identify the ox…
a) (i) Define the term 'standard enthalpy of combustion'. (ii) State Hess's Law of constant heat summation. b) Using the following standard enthalpies of formation, calculate the standard enthalpy of…
(a) Define the term 'homologous series' as used in organic chemistry. State THREE characteristics of a homologous series. [4 marks] (b) Consider the following organic compounds: ethane, ethene, ethano…