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Flashcards in Using Limestone Deck (26):
1

What is limestone mostly made of? and What is it often formed from?

Mostly Calcium Carbonate, CaCO3
Formed from sea shells

2

When limestone is heated it [ ] to make calcium [ ] and [ ]

Thermally decomposes
Calcium Oxide
Carbon dioxide

3

Calcium Oxide = (Formula and common name)

CaO and Quicklime

4

What other materials thermally decompose in the same way as limestone?

Magnesium, Copper, Zinc and Sodium CArbonates

5

Why can't you thermally decompose some materials with a Bunsen burner?

Doesn't get hot enough

6

Calcium Carbonate reacts with acid to make a calcium [ ], carbon dioxide and [ ]

salt
water

7

The type of salt depends on the type of [ ]

acid

8

Calcium Oxide reacts with water to produce [ ].

calcium hydroxide

9

Calcium hydroxide = (Formula and common name)

Ca(OH)2 and Slaked lime

10

Calcium hydroxide is an alkali/acid

alkali

11

Calcium hydroxide can be used to neutralise...

acidic soil

12

What is an advantage of using Calcium hydroxide over powdered limestone to neutralise acidic soil?

Calcium hydroxide works much FASTER

13

Calcium hydroxide can also be used in a test for [ ]

Carbon Dioxide

14

How do you use Calcium hydroxide to test for Carbon Dioxide?

If you make a solution of Calcium hydroxide in water (lime water) and bubble gas through it, the solution will turn cloudy if there's CO2 in the gas
The cloudiness is caused by the formation of Calcium Carbontate

15

Calcium hydroxide reacts with [ ] to create Calcium hydroxide solution which is called...

water
Lime water or Ca(OH)2 (aq)

16

How do you make CEMENT?

Powdered Limestone is heated in a kiln with powdered CLAY

17

How do you make MORTAR?

Cement is mixed with sand and water

18

What else can you use to make MORTAR?

Calcium hydroxide

19

How do you make CONCRETE?

Mix cement with sand and aggregate

20

What is aggregate?

Water and gravel

21

What are the disadvantages of quarrying limestone? (5)

Makes a huge, ugly hole, which permanently change the landscape

Quarrying processes, like blasting rocks with explosives, create dust and noise

Destroys the habitats of animals and birds

Limestone transported away in lorries creates noise and pollution

Waste materials produce unsightly tips

22

How does making stuff from limestone create pollution? (2)

Cement factories make a lot of dust, which can cause breathing problems

Energy is needed to produce cement and quicklime. The energy is likely to come from burning fossil fuels which causes pollution

23

Advantages of using limestone (5)

Provides material for roads, buildings. Chemicals used in making dyes, paints and medicines also come from limestone.
Limestone products neutralise acidic soil. Acidity in lakes and rivers caused y acid rain is also neutralised by limestone
Used in power station chimneys to neutralise sulphur dioxide (causes acid rain)
Quarrying provides jobs -> More money for the local economy -> local improvements (roads)
Landscaping and restoration after quarrying is part of the planning permission

24

4 Advantages of limestone as a building material

Widely available
Cheaper than granite or marble
Fairly easy rock to cut
Can be more hard-wearing than marble

25

Concrete : Advantage (4)
Disadvantage (2)

Advantage: Quick, cheap, poured into any shape mould, doesn't corrode
Disadvantage: Ugly, low tensile strength

26

Advantage of Limestone, concrete and cement (Erosion) (3)

Doesn't rot (unlike wood)
Can't be gnawed by insects or rodents
Fire-resistant