N5 Chemistry Unit 1 revision

Why does having a smaller particle size increase the rate of a reaction?

• Increases the concentration of reactants

• Decreases concentration of reactants

• Increases temperature

• Increases the surface area

An acidic solution contains...

• no ions

• more hydroxide ions than hydrogen ions

• only hydrogen ions

• more hydrogen ions than hydroxide ions

10 cm³ of gas is produced in 20 seconds. What is the average rate?

• 20/10 cm³s^-1

• 10/20 cm³s^-1

• 1/20 cm³s^-1

• 1/10 cm³s^-1

Which of the following elements exists as a covalent network?

• silicon

• oxygen

• chlorine

• hydrogen

What happens to the rate of a reaction as the concentration is decreased?

• increases

• decreases

• stays the same

Which of the following solutions is not a salt?

• Sodium chloride

• potassium nitrate

• copper sulfate

• magnesium hydroxide

What is the gram formula mass of nitrogen?

• 14

• 7

• 21

• 4

Which compound would not neutralise hydrochloric acid?

• sodium hydroxide

• sodium chloride

• sodium oxide

• sodium carbonate

Which of the following structures is never found in compounds?

• monatomic

• diatomic

• covalent network

• ionic lattice

Why do atoms have an overall neutral charge?

• same number of protons and neutrons

• same number of protons and electrons

• same number of electrons and neutrons

• atoms have an overall positive charge