N5 Chemistry MC 2023

The average rate of a chemical reaction was calculated to be 5 cm³ s⁻¹ for the first 60 s of the reaction. What volume of gas was collected in the first 60 s of the reaction?

• 0.08 cm³

• 12 cm³

• 55 cm³

• 300 cm³

Which line in the table correctly describes a proton?

• A

• B

• C

• D

Which of the following compounds forms molecules with an angular structure?

• CCl₄

• NCl₃

• SCl₂

• FCl

Which of the following diagrams could be used to represent the structure of lithium fluoride?

• 
• 
• 
• 

Answer explanation

A = metallic lattice

B = ionic lattice

C = covalent molecule

D = covalent network

In which of the following compounds does the iron ion have a 3+ charge? You may wish to use the data booklet to help you.

• FeO

• FeP

• Fe(NO₃)₂

• Fe₃(PO₄)₂

Which solution contains the least number of moles of solute?

• 100 cm³ of 1.00 mol l⁻¹

• 150 cm³ of 0.75 mol l⁻¹

• 200 cm³ of 0.60 mol l⁻¹

• 250 cm³ of 0.25 mol l⁻¹

Which of the following substances, when shaken with water, would cause the pH of water to increase? You may wish to use the data booklet to help you.

• Aluminium oxide

• Barium oxide

• Nitrogen oxide

• Hydrogen oxide

Nickel carbonate, nickel hydroxide and nickel metal all react with dilute sulfuric acid. Which of the following statements is true for all three reactions?

• A gas is produced.

• Water is produced.

• Nickel sulfate is produced.

• A neutralisation reaction takes place.

Sodium carbonate can be used to neutralise hydrochloric acid. The correct equation omitting the spectator ions is

• H⁺(aq) + OH⁻(aq) → H₂O(ℓ)

• 2H⁺(aq) + CO₃²⁻(aq) → H₂O(ℓ) + CO₂(g)

• 2H⁺(aq) + CO₃²⁻(g) → H₂O(ℓ) + CO₂(g)

• Na⁺(aq) + Cl⁻(aq) → NaCl⁻(aq)

The name of the above compound is CH₃CH(CH₃)CH₂C(CH₃)₂CH₃.

• 2,2,4-trimethylpentane

• 2,4,4-trimethylpentane

• 2,2,4-trimethylpentene

• 2,4,4-trimethylpentene.