WJEC chem 1 higher tier

WJEC chemistry 1 higher tier. I used these in january and achieved an A* (: sorry for any spelling mistakes.

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MASH­ metal + acid--salt + hydrogen
1man + wife--mini him + her
Group 1 metal + water--metal hydroxide + hydrogen
Acids can't stand cold water
Acid + carbonate (metal) - salt + co2 + water
Mad otters always sing wonderfully
Metal oxide + acid--salt + water
Acid + alkali--salt + water
Salt­ the hydrogen in an acid replaced by a metal
Exothermic­ give out more energy than they take in (-) - temp increases
Endothermic­ take in more energy than they give out (+) - temp falls
Energy to brake bonds-- energy to make bonds= answer.
Hydrogen only releases water when burnt
Nano particles
Antibacterial and antifungal properties
Wound dressing and refrigerators
Different properties to their stock size elements (versions)
Many properties are unknown
Can penetrate skin
May cause cancer
Propane + oxygen -> carbon dioxide and water
Carbon monoxide may be produces from incomplete combustion
Viscosity- how thick and unrunny it is
Crude oil is a hydrocarbon
Hydrogen is the only fuel which does not produce damaging gases- only produces water vapour
Half strength acid- half amount of product produced
Acids contain hydrogen
Alkali contain hydroxide
Bromine ­ red brown liquid
Iodine- brown yellow liquid/ blue/purple solid
Chlorine- green gas
Chlorides--white precipitate
Bromides­ cream precipitate
Iodides­ yellow precipitates
Group 1­ alkali metals
Group 2­ alkaline earth metals
Centre block­ transition metals
Groups 3-6­ non gases
Group 7--halogens
Group 8/0--noble gases.
Incomplete combustion­ carbon monoxide present
Avoid incomplete combustion­ constant flow of oxygen
Every gas that doesn't have a full outer shell goes around in pairs e.g. hydrogen
Elements in the same group react similarly
Metal + water = metal hydroxide

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Metal + oxide = metal oxide
Lithium­ red
Calcium­ orange/red
Lithium­ orange/yellow
Copper­ green
Potassium­ lilac
Magnesium­ bright white sparks
Halogens--toxic vapours
Chlorine­ orange yellow
Bromine0 green
Iodine­ purple/pink
Group 1 metal-
Highly reactive ­ stored in oil, low melting point and low density, form strongly alkaline hydroxides.
Group 2­
Reactivity increases as you go down.
Transition metals-
Typical metal properties­ hard, strong, ideal for manufacturing.
Group 7­ the halogens
A reactive halogen can displace a less reactive element from a solution of salts.…read more

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Fossil fuels­ coal oil and gas­ formed from plant and animal remain millions years ago.
Crude oil­ a mixture of hydrocarbons--gases, liquids or solids.
Hydrocarbon­ a compound of hydrogen and carbon only.
Fraction distillation­ the method used to separate crude oil. Produces gas, petrol
Fractional column­ the temp is hot at the bottom and cool at the top­ gases condense diff heights. More flammable as you
go up.
Fraction­ the liquid collected which contains a small range of boiling points.
Combustion­ burning in air.…read more


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