4.2 Reactions of Metals

• Match the metal with its position in the reactivity series:

  Potassium ↔️ Most reactive

  Iron ↔️ Less reactive

  Silver ↔️ Least reactive
• More reactive metals react with dilute acids to produce hydrogen gas and a salt.


  True
• Steps of the reaction between magnesium and hydrochloric acid:

  1️⃣ Magnesium reacts with hydrochloric acid

  2️⃣ Hydrogen gas and magnesium chloride are formed
• A more reactive metal can displace a less reactive metal from its compounds.


  True
• What is the balanced chemical equation for the reaction between magnesium and hydrochloric acid?

  $Mg +$$2HCl \rightarrow H_{2} +$$MgCl_{2}$
• Iron can be oxidized by copper ions because iron is more reactive than copper.


  True
• Cathodic protection uses a more reactive metal to protect a less reactive metal from corrosion.


  True
• A more reactive metal will displace a less reactive metal from its compounds.

  True
• The reactivity series determines how metals react with dilute acids
• The reactivity series orders metals by their relative reactivity
• When metals react with dilute acids, they produce hydrogen gas and a salt
• More reactive metals in the reactivity series are more easily oxidized
• What is galvanizing steel, and why is it effective in preventing corrosion?

  Coating with zinc, which corrodes sacrificially
• Displacement reactions occur when a more reactive metal displaces a less reactive metal from its compound
• Copper is the least reactive metal and does not react with dilute acids
• What are the products of the reaction between iron and copper sulfate?

  Iron sulfate and copper
• Order the metals by their reaction rate with dilute acids, from fastest to slowest:

  1️⃣ Potassium

  2️⃣ Sodium

  3️⃣ Calcium

  4️⃣ Magnesium

  5️⃣ Iron

  6️⃣ Copper
• Match the factor with its effect on corrosion rate:

  Reactivity of Metal ↔️ Corrodes faster

  Presence of Oxygen ↔️ Increases corrosion
• Match the corrosion prevention method with its description:

  Painting/Coating ↔️ Creates a physical barrier

  Cathodic Protection ↔️ Sacrificially corrodes a more reactive metal

  Alloying ↔️ Creates a more corrosion-resistant metal
• Steps of the reaction between iron and copper sulfate in a displacement reaction:

  1️⃣ Iron reacts with copper sulfate

  2️⃣ Iron displaces copper

  3️⃣ Iron sulfate and copper metal are formed
• Match the metal with its reaction with dilute acid:

  Potassium ↔️ Reacts violently

  Iron ↔️ Reacts slowly

  Copper ↔️ Does not react
• Iron displaces copper from copper sulfate in a displacement reaction.

  True
• Match the metal with its reactivity level:

  Potassium ↔️ Most reactive

  Copper ↔️ Less reactive
• What happens to a metal during oxidation?

  It loses electrons
• Painting or coating a metal surface creates a barrier