C - Limestone Flashcards
Limestone is mainly…
CALCIUM CARBONATE
What is thermal decomposition?
When one substance is HEATED and therefore CHEMICALLY CHANGES into at LEAST 2 new substances.
Limestone reacts with… (3)
- Heat
- Acid
- Water
When limestone is thermally decomposed, it produces…
- Calcium oxide
* Carbon dioxide
Calcium oxide and water produce _________ which is useful to test whether ________ is present. This is the ______test.
- Calcium Hydroxide
- Carbon dioxide
- Limewater
Limestone can be used as building material such as… (2)
- Mortar
- Cement
- Concrete
Extracting limestone is called…
Quarrying
What are some ( at least 2 ) disadvantages of quarrying limestone?
- Huge ugly holes which permanently change the landscape
- Noise and dust pollution
- Destroys habitats
- The limestone needs to be transported away from the quarry which causes more noise and pollution
- Lots of energy, lots of money
What are some ( at least 2 ) advantages of quarrying limestone?
- It’s useful - it provides things that people want e.g paints, houses, roads,medicines
- Neutralises acidic soil
- Provides jobs for people and brings more money to the local economy
- Neutralises sulfur dioxide
- Landscaping and restoration of the area is normally required as part of planning permission
What is the symbol for calcium carbonate?
CaCO3 - little 3
What’s the SYMBOL equation for Calcium carbonate when it’s thermally decomposing
CaCO3 ➡️ CaO + CO2
What’s the WORDY equation for Calcium carbonate when it’s thermally decomposing
Calcium carbonate ➡️ calcium oxide + carbon dioxide
What is the test that you do for detecting CO2
Limewater test
Describe the lime water test
- calcium hydroxide solution is put into a test tube
- A straw is exhaled into to create carbon dioxide to flow through the solution
- This produces a cloudy white precipitate of calcium carbonate
What’s slaked lime?
Another word for calcium hydroxide
Calcium carbonate also reacts with acids such as sulfuric acid… say the wordy formula for this reaction
Calcium carbonate + sulfuric acid ➡️ calcium sulfate + carbon dioxide + water
Calcium carbonate breaks down when…
Heated strongly (thermal decomposition)
What are the 3 other metal carbonates that decompose in the same way as calcium carbonate?
- Sodium carbonate
- Magnesium carbonate
- Copper carbonate
What is it called when limestone and sulfuric acid come into contact?
Acid rain
The calcium oxide (produced by thermal decomposition) + water produces…
Calcium hydroxide
What’s the symbol formula for producing calcium hydroxide
- Doesn’t matter too much if you can’t get this
CaO + H20 ➡️ Ca(OH)2
What are the two uses of calcium hydroxide?
- It can be used to NEUTRALISE acidic soil
* It can be used to test for CO2
Calcium hydroxide is an ______ which can be used to _________ acidic soil in fields
Alkali
Neutralise
Why are some metals difficult to decompose in a classroom environment?
Because they are too high up in the reactivity series and so they’d need more heat energy than a Bunsen burner
What’s quicklime?
The product created after the thermal decomposition on CaCO3
