C3- chemicals in our lives
- Created by: willbrewin1
- Created on: 18-04-15 12:21
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- C3- chemicals in our lives
- techtonic plate movements
- Eath's crust is split into tectonic plates- convection currents in the earths mantle cause them to move
- when the plates move apart, magma forms new rock, it is magnetised in the direction of the earth's magnetic field
- this swaps from reversed polarity to normal polarity every 1/2 million years
- when the plates move apart, magma forms new rock, it is magnetised in the direction of the earth's magnetic field
- Eath's crust is split into tectonic plates- convection currents in the earths mantle cause them to move
- sedimentary rocks
- formed when sediment build up and is 'squished' toghether
- contain either water borne or air borne grains, and sometimes fossils
- gives us clues about the history of the earth
- different rocks = different minerals
- formed through sedimentation, mountain building, erosion or dissolving
- coal- sedimentary, mainly carbon, impure
- SALT
- left behind in evaporation, can be extracted from underground
- normal salt mining- rock salt is blasted, dug out and brought to surface
- impure, grit on roads not food, could collapse
- solution mining- water into deposit, brine is made and extracted, then salt is taken through evaporation or electrolysis
- could collapse, so dangerous
- from sea- sea water into shallow section, evaporates leaving salt. Very pure
- Food- preserves and adds flavour
- health risks- high blood pressure, type 2 diabetes and heart disiease
- food companies put in to make taste better and last longer any way
- health risks- high blood pressure, type 2 diabetes and heart disiease
- electrolysis- splitting a compound by running a current through it
- sodium chloride- chlorine (bleach etc), sodium hydroxide (soap etc) and hydrogen (fuel cells etc)
- environment impacts- mercury, toxic so ca contaminate water, high energy, CO2 asbestos used
- chlorination- adding chlorine to water
- kills bacteria, prevents algae and bad odours in pipes and organic discolouration reduced
- can react with organisms- cancerous, chlorine is an irritant!
- Alkalis- a compound that forms OH- ions when dissolved in water
- soluble hydroxides and carbonates are alkali
- react with acids to form salt and water
- uses- dyes for cloth, neutralise acidic soil, manufacturing glass, convert fats and oils to soap
- LEBLANC process- 19th century
- sodium carbonate from sodium chloride and sulfuric acid heated with charcoal and limestone
- problems- expesive, sulfur is a toxic waste, elost of energy needed
- life cycle assessments
- looks at materials used in making, manufacturing the product, use of the product and disposal of the product
- all taken into account and then the environmental impacts are identified
- looks at materials used in making, manufacturing the product, use of the product and disposal of the product
- techtonic plate movements
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