4.2 Reactions of Metals

• Potassium displaces all other metals in displacement reactions.


  True
• Arrange the following metals in order of reactivity from most reactive to least reactive:

  1️⃣ Potassium

  2️⃣ Sodium

  3️⃣ Magnesium

  4️⃣ Zinc

  5️⃣ Iron

  6️⃣ Lead

  7️⃣ Copper
• Iron is more reactive than copper in the reactivity series.


  True
• Which metals are highly reactive in the reactivity series?

  Potassium and sodium
• When metals react with oxygen, they oxidize to form metal oxides
• Match the metal with its reaction rate and oxide formed:

  Potassium ↔️ High, Potassium Oxide

  Magnesium ↔️ Moderate, Magnesium Oxide

  Iron ↔️ Low, Iron Oxide

  Copper ↔️ Very Low, Copper Oxide
• Which metal rusts in the presence of water and air?

  Iron
• Arrange the following metals in order of their reaction rate with dilute acids from fastest to slowest:

  1️⃣ Potassium

  2️⃣ Calcium

  3️⃣ Magnesium

  4️⃣ Iron
• The reactivity series helps predict the extent to which a metal will react with water
• Potassium reacts explosively with dilute acid, forming hydrogen gas and potassium chloride.
• Match the metal with its reactivity order in the reactivity series:

  Potassium ↔️ Most Reactive

  Iron ↔️ Low

  Copper ↔️ Least Reactive
• The reactivity series helps predict which metals will displace others in displacement reactions.
• Copper can displace iron from its compounds.

  False
• Displacement reactions occur when a more reactive metal replaces a less reactive metal from its compound.
• Match the metal with its ability to displace other metals:

  Magnesium ↔️ Displaces Zinc, Iron, Copper

  Zinc ↔️ Displaces Iron, Copper

  Copper ↔️ Displaces None
• When metals react with oxygen, they undergo oxidation to form metal oxides.
• Potassium reacts with oxygen at a very rapid rate.
• Copper oxidizes very slowly with oxygen.


  True
• The reactivity series predicts how a metal will react with oxygen, water, and acids.
• When metals react with water, they form metal hydroxide and hydrogen gas.
• Iron reacts with cold water.

  False
• Copper does not react with dilute acids.

  True
• Metal reactions are used in industries for metal extraction, corrosion protection, and energy production.
• What does the Reactivity Series of Metals rank metals by?

  Ability to lose electrons
• Which metals does magnesium displace in displacement reactions?

  Zinc, iron, lead, copper
• What happens when iron is placed in a copper sulfate solution?

  Iron displaces copper
• What is the reactivity series based on?

  Tendency to lose electrons
• Copper is the least reactive metal in the reactivity series.


  True
• What is the general equation for the reaction of metals with oxygen?

  Metal + Oxygen → Metal Oxide
• Potassium reacts violently with water to produce hydrogen gas.


  True
• What are the products of the reaction between potassium and water?

  Potassium hydroxide + hydrogen
• More reactive metals react faster with dilute acids than less reactive metals.


  True
• Which metal does not react with dilute acids?

  Copper
• Copper reacts with dilute acid.

  False
• Copper does not react with dilute acids.

  True
• Order the following metals from most to least reactive based on the reactivity series:

  1️⃣ Potassium

  2️⃣ Sodium

  3️⃣ Calcium

  4️⃣ Magnesium

  5️⃣ Iron

  6️⃣ Copper
• Galvanized steel uses sacrificial protection to prevent corrosion.


  True