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2535110
Materials from the Earth
Descrição
Chemistry Unit 1, Topic 2
Sem etiquetas
chemistry
edexcel
limestone
chemistry
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larissa.hayden08
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larissa.hayden08
aproximadamente 9 anos atrás
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Materials from the Earth
C1.5 Rocks & Their Formation
igneous rocks
solidification of magma/lava
interlocking crystals
slower cooling = larger crystals
e.g. granite
sedimentary rocks
layers of sediment compacted
erode easily
may contain fossils
e.g. chalk & limestone
metamorphic rocks
from existing rocks by heat/pressure
e.g. marble from chalk/limestone
C1.6 Limestone & Its Uses
uses
concrete/cement/glass
construction
steel/iron alloys
quarrying
advantages
provides jobs
limestone=important raw material
exported-aids UK economy
jobs help local economies
disadvantages
spoils scenery
lorries produce noise/pollution/traffic
dust/noise
destroys habitats
thermal decomposition
CaCO3 --> CaO + CO2
C1.8 Chemical Reactions
thermal decomposition
copper carbonate = easiest
zinc carbonate
calcium carbonate = hardest
atoms
smallest particle of element
take part in reactions
not created/destroyed
rearranged
mass
remains the same in sealed container
precipitation reaction
2 soluble reactants form insoluble precipitate
C1.9 Reactions of Calcium Compounds
making limewater
1. CaCO3 --> CaO+CO2
2. CaO+H2O --> Ca(OH)2
fizzing,steam,heat
3. Ca(OH)2+CO2 --> CaCO3+H2O
when CO2 is bubbled through calcium hydroxide limewater is produced
neutralising acids
calcium compounds neutralise acids
e.g. in soil
e.g. in power stations to get rid of sulphur dioxide and nitrogen oxides
this reduces acid rain
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