Displacement Reactions

Which of the following best describes a displacement reaction?

• Two non-metals combine to form a compound.

• A more reactive element replaces a less reactive element in a compound.

• A compound breaks into simpler substances.

• A metal reacts with oxygen to form an oxide.

Which metal is the most reactive?

• Copper

• Zinc

• Magnesium

• Potassium

Which halogen is the least reactive?

• Fluorine

• Chlorine

• Bromine

• Iodine

What products are formed when calcium reacts with hydrochloric acid?

• CaCl + O₂

• CaCl₂ + H₂

• CaOH + H₂

• CaH₂ + Cl₂

Which of the following reactions will NOT occur?

• Mg + CuSO₄ → MgSO₄ + Cu

• Zn + HCl → ZnCl₂ + H₂

• Cu + ZnSO₄ → CuSO₄ + Zn

• K + H₂O → KOH + H₂

Balance: Zn + HCl → ?

• Zn + HCl → ZnCl + H

• Zn + 2HCl → ZnCl₂ + H

• 2Zn + HCl → Zn₂Cl + H

• Zn + HCl → ZnH₂ + Cl₂

Which reaction correctly shows displacement?

• Cl₂ + 2NaBr → 2NaCl + Br₂

• I₂ + NaCl → NaI + Cl₂

• Br₂ + RbF → RbBr + F₂

• Cu + H₂O → CuOH + H₂

Which element would you expect to displace silver from AgNO₃?

• Copper

• Gold

• Mercury

• Platinum

Why does sodium react violently with water but magnesium does not?

• Sodium is less dense.

• Sodium is lower in the reactivity series.

• Sodium is higher in the reactivity series

• Magnesium is heavier.

A farmer uses zinc-coated nails (galvanisation). Why don’t the nails rust?

• Zinc reacts with oxygen faster, protecting iron

• Iron is unreactive.

• Rust only forms on copper.

• Water cannot touch the iron.