9f Reactivity Quick Quiz

Which of these is a chemical reaction?

• boiling
• burning
• condensing
• melting

Which of these describes a physical change?

• A liquid catches fire
• A liquid cools down and changes into a solid
• A solid changes colour and releases a gas when heated
• A solid fizzes when added to an acid

Gas pressure is caused by gas particles …

• attracting each other
• hitting each other
• hitting the walls of the container
• moving around

The pressure of a gas increases as the temperature increases because …

• there are more particles in the container
• the particles are further apart
• the particles get bigger
• the particles move faster

Which of these metals reacts quickly with cold water?

• copper
• gold
• silver
• sodium

Which salt is formed when magnesium reacts with dilute nitric acid?

• magnesium chloride
• magnesium oxide
• magnesium nitrate
• magnesium sulfate

The type of change when a metal reacts with oxygen is …

• distillation
• neutralisation
• oxidation
• thermal decomposition

Which of these shows the essential conditions needed for iron to rust?

• air only
• air and water only
• air salt and water only
• water only

The test for oxygen is that it …

• pops a lighted splint
• relights a glowing splint
• turns cobalt chloride paper pink
• turns limewater milky

A hydrocarbon contains the elements hydrogen and carbon only. Which of these formulae represents a hydrocarbon?

• C₃H₈
• C₆H₁₂O₆
• CO₂
• NaHCO₃