Chemical reactions: acid and metal carbonate

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Waxaan qeexi karaa waxa dhacaya marka karboonayt bir ah uu la falcelo aashito waxaana u qori karaa isla'egyo kiimiko oo qeexaya falcelintan.

Introduction

In this lesson: I can describe what happens when a metal carbonate reacts with an acid and write chemical equations to describe these reactions. A group of one carbon atom and three oxygen atoms bonded together is called a carbonate group. Metal carbonate + acid → salt + water + carbon dioxide

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A group of one carbon atom and three oxygen atoms bonded together is called a carbonate group. Metal carbonate + acid → salt + water + carbon dioxide The test for carbon dioxide gas is to bubble it through limewater as it turns the solution cloudy (milky). Rain water is usually a little acidic and when it is more acidic than normal it is called acid rain. Acid rain reacts with marble to produce a salt, water and carbon dioxide, using up some of the marble.

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Quizzes

1. When sodium hydroxide is added to hydrochloric acid, what happens to the pH of the solution?
- Correct answer:it increases
- it decreases
- it stays the same
- it becomes pH7
2. Which of the following equations is the general equation for a neutralisation reaction?
- Correct answer:acid + base → metal salt + water
- acid + base → metal salt + hydrogen
- acid + base → metal + water
- acid + base → salt + water
3. A pupil investigates the neutralisation of hydrochloric acid with sodium hydroxide. They add two drops of universal indicator to the solution, which turned blue. What does this tell them?
- Correct answer:The pupil has added too much sodium hydroxide.
- Correct answer:The solution is alkaline.
- The pupil has added too much hydrochloric acid.
- The pupil has used the wrong indicator.

1. Which of the following is the correct formula for a carbonate group?
- CO₁
- CO₂
- Correct answer:CO₃
- C₂O₃
2. metal ________ + acid → metal salt + water + carbon dioxide
- base
- oxide
- nitrate
- Correct answer:carbonate
- sulfate
3. Which of the following statements about rainwater are incorrect?
- Correct answer:Rainwater has a pH of about 4.5.
- Rainwater is naturally slightly acidic.
- Correct answer:Rainwater with a pH higher than 5.6 is called acid rain.
- Rainwater and acid rain both react with marble statues.
4. Which of the following are examples of chemical weathering?
- The Sun warming rocks, causing them to expand and crack.
- Correct answer:Limestone rocks being slowly dissolved by acid rain.
- Tree roots growing into cracks in rocks, making them wider so they crack.
- Correct answer:Statues made from calcium carbonate very slowly losing their features.
5. Which of the following equations is the correct balanced symbol equation for the reaction between calcium carbonate and hydrochloric acid?
- CaCO₃(s) + 2HCl(l) → CaCl₂(s) + H₂(g) + CO₂(s)
- CaCO₃(s) + HCl(l) → CaCl(s) + H₂O(l) + CO₂(g)
- Correct answer:CaCO₃(s) + 2HCl(aq) → CaCl₂(s) + H₂O(l) + CO₂(g)
- CaCO₃(s) + HCl(aq) → CaCl₂(s) + H₂O(l) + CO₂(g)

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