Unit 1- Limestone Flashcards
What is the chemical name for limestone?
CaCO3/Calcium Carbonate
How is limestone obtained?
Through quarrying.
What happens when it is heated?
It thermally decomposes to make calcium oxide and carbon dioxide.
What is thermal decomposition?
When a substance chemically changes into at least two new substances when it is heated.
What is formed when calcium carbonate reacts with acid? (3)
Calcium salt, carbon dioxide and water.
What damages limestone?
Acid rain.
What does limestone (calcium carbonate) form when you add water?
Calcium hydroxide.
What is calcium hydroxide used for?
Neutralising acidic soil.
If you add more water it makes limewater which can test for Carbon Dioxide. It will turn cloudy if CO2 is present.
What is formed when powdered limestone is heated in a kiln with powdered clay?
Cement is formed.
How do you make mortar?
Mix cement with sand and water.
How do you make concrete?
Mix cement with sand and aggregate (water and gravel).
How does quarrying limestone effect the landscape? (5)
- Leaves holes/craters
- Quarrying processes (e.g explosives) cause noise and dust in scenic areas
- Destroys habitats of animals and birds
- Limestone is transported via lorry so there is more noise and pollution
- Waste materials produced
How does making things from limestone cause pollution? (2)
- Cement factories make a lot of dust which can cause breathing problems for some
- Energy is needed to produce cement and quicklime. This energy usually comes from fossil fuels.
What are the benefits/uses of limestone? (4)
- Makes houses and roads
- Chemicals in dye, paints and medicine
- Neutralises acidic soil and sulphur dioxide
- Quarry provides jobs
Why is limestone a good building material? (5)
- Cheper that granite/marble
- Hard wearing
- Can be poured into moulds
- Doesn’t rot when wet
- Doesn’t corrode
