Chemistry Mock 2023

Question 1 of 50

An exothermic reaction has an enthalpy change (ΔH) that is

Question 2 of 50

Powdered chalk reacts faster with acid than lumps of chalk because the powder has

Question 3 of 50

What salt forms when sulphuric acid reacts with sodium hydroxide?

Question 4 of 50

Chlorine gas is

Question 5 of 50

Chlorine is added to drinking water mainly to

Question 6 of 50

Ionic compounds conduct electricity when

Question 7 of 50

Ethanol can be made from sugar by

Question 8 of 50

Pure water at 25 °C has a pH of

Question 9 of 50

Phenolphthalein is

Question 10 of 50

Oxidation is

Question 11 of 50

Compounds with the same molecular formula but different structures are

Question 12 of 50

Which process is endothermic?

Question 13 of 50

Breaking chemical bonds

Question 14 of 50

A catalyst speeds up a reaction by

Question 15 of 50

Raising the temperature increases the rate of reaction mainly because

Question 16 of 50

A common unit for the rate of a reaction is

Question 17 of 50

Adding a catalyst to a reaction at equilibrium

Question 18 of 50

The catalyst used in the Haber process for ammonia is

Question 19 of 50

At dynamic equilibrium,

Question 20 of 50

According to Brønsted and Lowry, an acid is

Question 21 of 50

A strong acid is one that

Question 22 of 50

Across Period 3 from sodium to chlorine, metallic character

Question 23 of 50

The oxides of non-metals such as sulphur are usually

Question 24 of 50

Down Group 17, the reactivity of the halogens

Question 25 of 50

When chlorine is bubbled into potassium bromide solution, the solution turns orange because

Question 26 of 50

Diamond is very hard because

Question 27 of 50

Graphite conducts electricity because it has

Question 28 of 50

Alkenes typically undergo

Question 29 of 50

An alkanoic acid reacts with an alkanol to form

Question 30 of 50

Breaking large hydrocarbon molecules into smaller, more useful ones is

Question 31 of 50

A solution has [H⁺] = 1 × 10⁻³ mol/dm³. What is its pH?

Question 32 of 50

A buffer solution

Question 33 of 50

A solution of sodium chloride in water is

Question 34 of 50

The point in a titration where exactly enough reagent has been added to react with the sample is the

Question 35 of 50

In electrolysis, reduction takes place at the

Question 36 of 50

For N₂O₄ ⇌ 2NO₂, the equilibrium constant Kc is expressed as

Question 37 of 50

The conjugate base of HSO₄⁻ is

Question 38 of 50

Aluminium oxide is amphoteric, meaning it

Question 39 of 50

Sodium chloride has a high melting point because

Question 40 of 50

The product of the reaction between ethene and hydrogen bromide is

Question 41 of 50

The general formula of the alkynes is

Question 42 of 50

For a zero-order reaction, the rate

Question 43 of 50

The half-life of a first-order reaction

Question 44 of 50

The value of Kc changes only when

Question 45 of 50

A Lewis acid is a substance that

Question 46 of 50

Down Group 2, the solubility of the hydroxides

Question 47 of 50

Chlorine reacts with cold dilute sodium hydroxide to form

Question 48 of 50

Hydrogen halides become stronger acids down the group because

Question 49 of 50

The pH of 0.01 mol/dm³ NaOH at 25 °C is

Question 50 of 50

Iron(III) chloride solution is acidic because