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Last Lesson Review

• What gas is produced when a metal reacts with an acid?

• Challenge: How would you test for carbon dioxide gas?

• Last Week's Focus: Name one metal that reacts quickly with dilute hydrochloric acid.

• Last Term Summary: What is formed when magnesium reacts with sulfuric acid?

• Last Year's Context: The burning of fuels that releases carbon dioxide is referred to as combustion.

Learning Objective

• Title: Metal Carbonates and Acids

• Objective: To explain what products are formed when a carbonate reacts with an acid.

Last Lesson Outcomes

• Gas produced: Hydrogen gas.

• Challenge response: Carbon dioxide gas turns limewater milky/cloudy.

• Last week's focus response: Magnesium.

• Last term response: Magnesium sulfate and hydrogen gas.

Learning Outcomes (LOs)

1. To explain that the reaction between a metal carbonate and an acid forms a metal salt, water, and carbon dioxide.

2. To describe the test for carbon dioxide.

General Reactions of Acids with Carbonates

• General Reaction Format:

  • $ext{Acid} + ext{Carbonate} <br>ightarrow ext{Salt} + ext{Water} + ext{Carbon dioxide}$

• Indicators of Reaction:

  • Fizzing (effervescence) due to carbon dioxide gas being released.

  • The solution may turn cloudy if tested with limewater.

General Equation for Metal Carbonates and Acids

• Format:

  • $ext{Metal Carbonate} + ext{Acid} <br>ightarrow ext{Salt} + ext{Carbon Dioxide} + ext{Water}$

Examples of Reactions

1. Hydrochloric acid + Calcium carbonate:

   • $ext{HCl} + ext{CaCO}<em>3 ightarrow ext{CaCl}</em>2 + ext{H}<em>2O + ext{CO}</em>2$

2. Sulfuric acid + Copper carbonate:

   • $ext{H}<em>2 ext{SO}</em>4 + ext{CuCO}<em>3 ightarrow ext{CuSO}</em>4 + ext{H}<em>2O + ext{CO}</em>2$

3. Nitric acid + Sodium carbonate:

   • $ext{HNO}<em>3 + ext{Na}</em>2 ext{CO}<em>3 ightarrow ext{NaNO}</em>3 + ext{H}<em>2O + ext{CO}</em>2$

4. Hydrochloric acid + Magnesium carbonate:

   • $ext{HCl} + ext{MgCO}<em>3 ightarrow ext{MgCl}</em>2 + ext{H}<em>2O + ext{CO}</em>2$

Case Study: Observations by Lily and Jake

• Context: Exploring the science lab with a piece of chalk (calcium carbonate).

• Reaction observed: Fizzing and bubbling when chalk was dropped into hydrochloric acid.

• Teacher's Explanation: Acid reacts with carbonates to produce carbon dioxide gas, water, and a salt.

• Testing for Carbon Dioxide: Gas collected in a test tube and bubbled through limewater, resulting in a cloudiness indicating CO2 presence.

• Final Observations: Experiment also performed with sodium carbonate, confirming that carbonates react with acids to release CO2 gas.

Worksheet Insights

1. Initial substance used in acid: Chalk (calcium carbonate).

2. Observations made during the reaction: The chalk started fizzing and bubbling.

3. Gas produced during reaction: Carbon dioxide.

4. Method of testing for carbon dioxide: Bubbling gas through limewater.

5. Limewater observation: Turned cloudy, confirming carbon dioxide presence.

6. Word equation: Hydrochloric acid + Calcium carbonate → Calcium chloride + Water + Carbon dioxide.

7. Other carbonate examples: Sodium carbonate, magnesium carbonate, copper carbonate.

8. Products formed when an acid reacts with a carbonate: Salt, water, and carbon dioxide gas.

9. Fizzing cause: Release of carbon dioxide gas, causing bubbles.

10. Effect of a stronger acid: Reaction would be faster and more vigorous, producing more fizzing.

Extension Activities

• Equation Practice:

  • Metal Carbonate + Acid → Salt + Water + Carbon Dioxide

• Examples:

  • Magnesium carbonate + Hydrochloric Acid → ___ + ___ + ___

  • Sodium Carbonate + Nitric Acid → ___ + ___ + ___

  • Calcium Carbonate + Sulfuric Acid → ___ + ___ + ___

• Challenge Questions:

  • $ext{CaCO}<em>3 + ext{H}</em>2 ext{SO}<em>4 ightarrow ext{</em>_<em>} + ext{H}</em>2O + ext{CO}_2$

  • ext{Na}2 ext{CO}3 + ext{__} ightarrow 2 ext{NaCl} + ext{H}2O + ext{CO}_2

Answers for Extension Practice

1. Hydrochloric acid + Magnesium carbonate → Magnesium chloride + Water + Carbon dioxide - $ext{HCl} + ext{MgCO}<em>3 ightarrow ext{MgCl}</em>2 + ext{H}<em>2O + ext{CO}</em>2$

2. Nitric acid + Sodium carbonate → Sodium nitrate + Water + Carbon dioxide - $ext{HNO}<em>3 + ext{Na}</em>2 ext{CO}<em>3 ightarrow ext{NaNO}</em>3 + ext{H}<em>2O + ext{CO}</em>2$

3. Sulfuric acid + Copper carbonate → Copper sulfate + Water + Carbon dioxide - $ext{H}<em>2 ext{SO}</em>4 + ext{CuCO}<em>3 ightarrow ext{CuSO}</em>4 + ext{H}<em>2O + ext{CO}</em>2$

Additional Worksheets

• Worksheet 1: Reactions Between Acids and Metals

  • Examples include reactions such as Magnesium + Hydrochloric acid produces Magnesium chloride + Hydrogen.

• Worksheet 2: Reactions Between Acids and Carbonates

  • Examples include Calcium carbonate + Hydrochloric acid → Calcium chloride + Carbon dioxide + Water.

• Worksheet 3: Reactions Between Acids and Bases

  • Examples include Sodium hydroxide + Hydrochloric acid → Sodium chloride + Water.

Final Recap on Expected Answers

Worksheet 1 Answers:

1. Iron + Hydrochloric acid → Iron chloride + Hydrogen.

2. Aluminium + Sulfuric acid → Aluminium sulfate + Hydrogen.

3. Calcium + Hydrochloric acid → Calcium chloride + Hydrogen.
   …

Worksheet 2 Answers:

1. Magnesium carbonate + Hydrochloric acid → Magnesium chloride + Carbon dioxide + Water.
   …

Worksheet 3 Answers:

1. Potassium hydroxide + Hydrochloric acid → Potassium chloride + Water.
   …