topic 10 continued Flashcards Preview

gcse chemistry 9-1 > topic 10 continued > Flashcards

Flashcards in topic 10 continued Deck (33):
1

why is extracting metals bad

as it uses a lot of energy
-produces large amounts of toxic waste

2

how is metal extracted

-the ore has to be dug out of the mine and transported for processing

-the metal has to be extracted from the ore and this can produce large amounts of toxic waste

3

how are plastic bags produced

using chemicals from crude oil

4

how are paper bags made

from wood from trees

5

why is crude oil bad

-it is non-renewable
-extracting crude oil can be harmful to habitats eg. if there is an oil leak

6

why are felling trees bad

as it is extremely destructive to habitats such as forests

7

what process do crude oil and wood need to go through

they need to be chemically processed

8

why is chemical processing bad

-requires a lot of energy
-releases waste products

9

what does making paper require

large amounts of water

10

how are paper bags bad- they require ...

they require lots of energy to be transported as they are heavier

11

what is the disadvantage of plastic

it is non-biodegradable - it is not broken down by microorganisms so this creates lots of litter

12

how are most metals found

in the earth's crust already reacted with other elements

13

give an example of a popular metal

copper

14

what does a metal ore contain

enough metal to make it economical to extract the metal

15

what is the problem with copper ores

they are running out

16

as copper ores are starting to run out what are we going to have to do next

extract copper from low-grade ores

17

what do low-grade ores contain

a very small amount of copper

18

what is the drawback from extracting copper from low-grade ores

it is very hard to extract the copper economically from the ores`

19

what is phytomining- (plants)

plants are grown on land containing the metal compound that we want

20

what do phytomining plants do (2)

-absorb the metal compound and they concentrate it in their tissue
-the plants are then harvested and burned

21

what does the ash (burned and harvested phytomined plants) contain

a high concentration of the metal compound

22

what does bioleaching use

bacteria

23

what happens in bioleaching

bacteria are mixed with low-grade ore

24

what does the bacteria do in bioleaching

the bacteria carry out chemical reactions and they produce a solution called a leachate

25

what does the leachate contain

a metal compound that we need

26

what do phytominign and bioleaching both allow us to do

economically extract metals from low-grade ores

27

how do we recycle metals

by melting them and then recasting them into different products

28

what is the problem of recycling metals

different metals need to be separated before recycling- this depends on the properties of the final product

29

what can some scrap steel be added to

iron from a blast furnace- this reduces the amount of iron we need to extract from the iron ore

30

how can glass bottles help sustainability `

by reducing the amount of energy needed to make new glass products, and also the amount of waste created when used glass is thrown away`

31

by what 2 ways is glass separated by

colour and chemical decomposition

32

what has been developed to reduce the amount of energy required for industrial processes

catalysts

33

what is the problem with life cycle assessments (2)

-they can be bias
-doesn't fully show the effects of the products