Starter: Quick Quiz What gas is produced when metals are reacted with acid? How do you test to see if this gas is present? Extension: Write the word equation.

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Presentation transcript:

Starter: Quick Quiz What gas is produced when metals are reacted with acid? How do you test to see if this gas is present? Extension: Write the word equation for magnesium reacting with hydrochloric acid.

L10 Carbonates and Acid Learning Objectives: 1.Recall that carbon dioxide gas is released when carbonates react with acid. 2.Describe the test for carbon dioxide. 3.Write word equations for the reaction of carbonates with acid.

1.Calcium + Hydrochloric Acid  Calcium Chloride + Hydrogen 2.Lithium + Sulphuric Acid  Lithium Sulphate + Hydrogen 3.Iron + Nitric Acid  Iron Nitrate + Hydrogen 4.Sodium + Sulphuric Acid  Sodium Sulphate + Hydrogen 5.Potassium + Nitric Acid  Potassium Nitrate + Hydrogen

Extension 6.Zinc + Phosphoric Acid  Zinc Phosphate + Hydrogen 7.Beryllium + Citric Acid  Beryllium Citrate + Hydrogen 8.Vanadium + Ethanoic Acid  Vanadium Ethanoate + Hydrogen

Test for Hydrogen Gas 1.Collect enough gas in a test tube. 2.Hold a lit splint or match to the mouth of the test tube. 3.If the gas burns with a squeaky pop, then the gas is hydrogen.

Practical: Carbonates and Acid We are now going to investigate another reaction, carbonates reacting with acids. (HINT: we have discussed this before as this counts as a neutralisation reaction and happens when an indigestion tablet is used)

Test for Carbon Dioxide Gas 1.Bubble the unknown gas into a test tube containing limewater. 2.If the limewater turns cloudy and white, then the gas was carbon dioxide.

Word Equations for Carbonates Reacting With Acids Metal Carbonate + Acid  Salt + Water + Carbon Dioxide The reaction of carbonates with acid always produces carbon dioxide gas. The salt we name as we have done before.

1.calcium carbonate + sulphuric acid  2.magnesium carbonate + nitric acid  3.barium carbonate + hydrochloric acid  4.Write an equation for a reaction that forms sodium chloride. 5.Write an equation for a reaction that forms lithium nitrate.

Weathering of Carbonate Rocks Many rocks contain calcium carbonate. Rain, which is slightly acidic, wears away the rock when the neutralisation reaction happens. Acid rain will make the reaction happen even faster. This wearing away of rock is called chemical weathering. Chemical weathering made the holes in this rock!