Chemistry Mock 2018

Question 1 of 50

The products of complete combustion of methane are

Question 2 of 50

The test for an alkene uses

Question 3 of 50

The scientific method begins with

Question 4 of 50

The molar mass of H₂SO₄ (H = 1, S = 32, O = 16) is

Question 5 of 50

Gases are easily compressed because their particles are

Question 6 of 50

The modern periodic table arranges elements in order of

Question 7 of 50

Elements in Period 2 have

Question 8 of 50

A molecule of chlorine, Cl₂, is held by

Question 9 of 50

The rate of a reaction can be measured by recording the

Question 10 of 50

A base that dissolves in water to give OH⁻ ions is an

Question 11 of 50

The noble gas used in advertising signs because it glows red is

Question 12 of 50

Iodine at room temperature is a

Question 13 of 50

The halogen used in toothpaste to prevent tooth decay is

Question 14 of 50

Metals conduct electricity because they have

Question 15 of 50

Universal indicator turns green in a

Question 16 of 50

Phenolphthalein in alkaline solution is

Question 17 of 50

The gas produced at the cathode during electrolysis of dilute sulphuric acid is

Question 18 of 50

Which change would NOT increase the rate of reaction between marble chips and acid?

Question 19 of 50

In the Haber process, the catalyst is

Question 20 of 50

The energy profile of an exothermic reaction shows products

Question 21 of 50

Alkanes undergo mainly

Question 22 of 50

The number of structural isomers of butane (C₄H₁₀) is

Question 23 of 50

The ozone layer is damaged by

Question 24 of 50

Temporary hardness of water can be removed by

Question 25 of 50

Bohr's model of the atom proposed that electrons

Question 26 of 50

How many moles are in 11.2 dm³ of a gas at s.t.p.?

Question 27 of 50

In CH₄ + 2O₂ → CO₂ + 2H₂O, how many moles of water form from 3 moles of methane?

Question 28 of 50

Evaporation differs from boiling because evaporation

Question 29 of 50

The formula of the compound formed between Al and O is

Question 30 of 50

The test for carbon in an organic compound is to burn it and pass the gas into

Question 31 of 50

Dissolving ammonium nitrate in water makes the solution

Question 32 of 50

The first member of the alkanoic acids is

Question 33 of 50

A solution of sodium ethanoate is

Question 34 of 50

Methyl orange in acid is

Question 35 of 50

In the reaction CuO + H₂ → Cu + H₂O, the reducing agent is

Question 36 of 50

The number of atoms in 0.5 mol of helium is (L = 6.02 × 10²³)

Question 37 of 50

The relative molecular mass of H₂SO₄ (H = 1, S = 32, O = 16) is

Question 38 of 50

An acid salt is formed when

Question 39 of 50

A gas occupies 200 cm³ at 300 K. At constant pressure, its volume at 450 K is

Question 40 of 50

The mass of NaOH (Na = 23, O = 16, H = 1) needed to make 250 cm³ of 0.2 M solution is

Question 41 of 50

How many moles of oxygen are needed to burn 2 moles of CH₄ completely?

Question 42 of 50

A gas diffuses 4 times faster than oxygen (M = 32). Its molar mass is

Question 43 of 50

What mass of CaO is formed from 50 g of CaCO₃ (Ca = 40, C = 12, O = 16)?

Question 44 of 50

How many coulombs are needed to liberate 1.12 dm³ of hydrogen at s.t.p.? (F = 96,500 C)

Question 45 of 50

The oxidation number of Mn in KMnO₄ is

Question 46 of 50

25 cm³ of 0.1 M NaOH neutralises 20 cm³ of HCl. The concentration of the HCl is

Question 47 of 50

The pH of 0.01 M HCl is

Question 48 of 50

In electrolysis of brine, the product at the anode is

Question 49 of 50

The mass of copper deposited by 0.2 mol of electrons (Cu = 64) is

Question 50 of 50

The activation energy of a reaction is lowered by a catalyst from 80 kJ/mol to 50 kJ/mol. The enthalpy change ΔH