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AQA Science B Unit 2 > 2.4 > Flashcards

Flashcards in 2.4 Deck (42):
1

how is limestone obtained from the ground

quarrying

2

uses of limestone in the building industry
production of iron/steel

structure of building

3

uses of limestone in the building industry
mortar

holds bricks or stone blocks together

4

uses of limestone in the building industry
glass

windows

5

concrete

roads

6

limestone to quicklime explanation

limestone is crushed, roasted in a kiln. carbon dioxide is released

7

limestone to quicklime reaction

heat
limestone (calcium carbonate) ---> quicklime (calcium oxide) + carbon dioxide

CaCO3 ---> CaO + CO2

8

quicklime to slakedlime explanation

add water to quicklime.
heat energy is released in the process

9

quicklime to slakedlime reaction

quicklime (calcium oxide) + water ---> slakedlime (calcium hydroxide)
CaO + H2O ---> Ca(OH)2

10

how is cement made

limestone is heated with clay and gypsum

11

how is mortar made

sand is added to cement and mixed with water

12

good properties of mortar

strong
cheap

13

mortar use

holds bricks together

14

concrete make?

mixing sand cement and stones

15

property and use of concrete

strong
build whole buildings

16

how to make glass

sand limestone and calcium carbonate heated

17

characteristic properties of metals
(5)

good heat/electrical conductors
malleable
resistant to corrosion
strength
hardness

18

what does it mean to be a good conductor

heat/electricity can travel through them easily

19

pipes / wires have what two properties?

high melting point
ductile

20

aluminium 2 properties

light weight
resistant to corrosion

21

two examples of things made from aluminium

window frames
pans

22

most polymers are manufactured using...

chemicals attained from crude oil

23

polymerisation
when are polymers produced?

when many small molecules (monomers) join together to form very large molecules

24

5 properties of polymers

flexible
resistant to corrosion
waterproof
poor conductors
low melting point
easy to mould

25

4 properties of ceramics

hard brittle solids
high melt
resistant to chemical attack

26

examples of ceramics
((material and examples))

clay and china
tiles plates mugs

27

what are composites made from

two or more type of material
combine different material's best properties

28

composite: reinforced concrete
2 properties

very strong
flexible

29

composite: use

buildings

30

composite: reinforced (fibre) glass
2 properties

strong
doesn't shatter

31

composite: reinforced fibre glass use

safety windows

32

3 examples of manufactured construction materials

polymers
ceramics
composites

33

example of a natural construction material

wood

34

copper

water pipes
hot water cylinders

35

why copper?

malleable
high melt point
good conductor
doesn't react with water

36

lead

flashing on roofs

37

why lead?

unreactive
malleable

38

2 advantages of quarrying

•valuable material
•employment

39

2 disadvantages of quarrying

•waste, dust, pollution
•spoil landscape

40

what is formed when calcium carbonate is heated?

calcium oxide (quicklime)

41

how is slaked lime formed? (calcium hydroxide)

calcium oxide (quicklime) is added to water

42

limestone can be thermally decomposed to form what?

quicklime (calcium oxide) and carbon dioxide