Metals and Acids KS3

Which observation is NOT a sign of a chemical reaction?

• fizzing

• temperature change

• dissolving

• colour change

What is made when a metal reacts with an acid?

• salt + water

• salt + hydrogen

• salt + carbon dioxide

• salt + oxygen

Which 2 types of reaction occur when a metal is heated in a Bunsen flame?

• oxidation

• neutralisation

• combustion

• displacement

Which of these is the correct definition for a displacement reaction?

• When a less reactive element swaps places with a more reactive element that is already in a compound

• When a more reactive element that is already part of a compound swaps places with a less reactive element

• When a more reactive element swaps places with a less reactive element that is already in a compound

• When a more reactive element that is already part of a compound swaps places with an element in another compound

Sodium is less reactive than potassium. Which is the correct equation for the displacement reaction between potassium chloride and sodium?

• Potassium chloride + Sodium → Potassium chloride + sodium

• Potassium chloride + Sodium→Potassium + sodium + chlorine

• Potassium chloride + Sodium→Potassium + Sodium chloride

• Potassium chloride + Sodium→ Sodium chloride + potassium

This is how you test for hydrogen gas

• Put a glowing splint in the gas. It will relight

• Put a lit splint in the gas. It will go pop

• Bubble the gas through limewater which will go cloudy

• The hydrogen will smell like rotten eggs

Which of these is a displacement reaction?

• Magnesium + oxygen → Magnesium oxide

• Hydrochloric acid + Sodium hydroxide → sodium chloride + water

• Calcium + Iron oxide → Calcium oxide + Iron

• Sodium + chlorine → Sodium chloride

Which equation is not correctly balanced?

• 2Na + 2H₂O → 2NaOH + H₂

• Mg + 2HCl → MgCl₂ + H₂

• 4Li +2O₂ → 2Li₂O

• 2Al + 2F₂ → 2AlF₃

What is the correct name of the acid with the formula HCl?

• hydrochloric acid

• hydrocholic acid

• hydrogen chloride acid

• hydrochlorate acid

Which of these compounds is an alkali?

• sodium

• sodium hydroxide

• sodium chloride

• sodium oxide