Science

1

100

• What property of magnesium allows it to displace hydrogen?

T Reactivity

200

• Which acid is commonly used in the reaction with magnesium?

Hydrochloric

300

• What test is used to confirm the presence of hydrogen gas?

DJ Pop

400

• Which metal is the least reactive in the series?

Gold

500

• What is the most reactive metal in the reactivity series?

Potassium

2

100

• What salt is formed when zinc reacts with hydrochloric acid?

S Zinc chloride

200

• What metal in railway tracks can be displaced by a more reactive metal?

Iron

300

• Which gas can cause rusting in railway tracks?

T Oxygen

400

• What type of reaction occurs when iron is replaced by a more reactive metal?

Displacement

500

• What metal is displaced when copper reacts with silver nitrate?

Silver

3

100

• What is the chemical formula for this reaction?

Mg + 2HCl → MgCl₂ + H₂

200

• Which metal is more reactive, zinc or aluminum?

DJ Aluminum

300

• What happens to the strength of iron when it rusts?

Decreases

400

• What pH range does soap usually have?

Basic

500

• What part of soap molecules repels water?

S Hydrophobic