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Chemistry GCSE > limestone and building materials > Flashcards

Flashcards in limestone and building materials Deck (29):
1

What happens when calcium carbonate is heated (thermally decomposed)

breaks down to form calcium oxide and carbon dioxide

thermal decomposition

2

what happens when calcium oxide reacts with water

calcium hydroxide

3

what can limestone and its products be used for

make cement, mortar and concrete

4

what is limestone mainly

calcium carbonate

CaCO3

5

what is thermal decomposition

when something decomposes by heating strongly

6

what other metal carbonates thermally decompose similarly to calcium carbonate

sodium carbonate

magnesium carbonate

copper carbonate

zinc carbonate

7

do metals high in the reactivity series (sodium calcium and magnesium) need a lot of energy to decompose them or a little bit

a lot

not all carbonates of group 1 metals decompose at temperatures reached by a Bunsen burner

8

are metals low down in the reactivity series (copper) hard to decompose or easy

easy

why used at school

changes colour- green to black

easy to see

9

what is calcium hydroxide obtained from

calcium carbonate

10

how do u make calcium oxide

heat calcium carbonate strongly (thermal decomposition)

created calcium oxide and carbon dioxide

calcium oxide is yellow when hot but white when cold

11

how do you make calcium hydroxide

calcium oxide and water forms calcium hydroxide (it's an alkali)

a lot of heat is produced in this reaction

12

what is limestone a type of

Rock, mainly composed of calcium carbonate

13

how is limestone obtained

CaCO3 is quarried and can be used as a building material

14

what do carbonate produce when they react with an acid

Carbon dioxide, a salt and a water


calcium carbonate + hydrochloric acid > carbon dioxide + calcium chloride + water

15

what damages limestone

acid rain

16

what carbonates react with acids

sodium carbonate

magnesium carbonate

zinc carbonate

copper carbonate

they all fizz and release carbon dioxide

17

how can you text for carbon dioxide

like water f turns cloudy

18

what is calcium hydroxide used for

to neutralise acidity ED lakes and soils affected by acid rain

19

what is cement

made by heating powdered limestone with clay

it is an ingredient in motar and concrete

20

what is motar

made by mixing cement with sand and water

used to join bricks together

21

what is concrete

made by mixing cement with sand, water and aggregate (crushed rock)

22

advantages of concrete

easily formed into different shapes

strong when squashed, weak when bent or stretched

23

disadvantages of concrete

made stronger by reinforcing it with steel

some say concrete building and bridges are unattractive

24

disadvantages with limestone cement and motar

react with carbon dioxide dissolved in rainwater and wear away- damages walls and leaves gaps

polliution makes rain more acidic making problems worse

25

advantages of limestone

valuable natural resource, used to make glass and concrete

provides employment opportunities- supports local economy

26

disadvantages of limestone

visible from long distances, permanently disfigure local environment

quarrying creates noise, traffic and damages people's quality of life - it's heavy

27

what do rocks provide

rocks provide essential building materials

28

how is calcium carbonate produced

when calcium hydroxide (limewater) reacts with carbon dioxide

limewater

29

do all carbonates of group 1 metals decompose at the tempreture reached by a Bunsen burner

no