C5 PPQ mistakes
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ammonia + hyrdochloric acid
ammonium chloride
Describe how bioleaching is used to extract copper from low grade ore
• use bacteria • to produce solution contain copper compounds • leachate produced • from which copper is obtained by displacement/electrolysis
ionic equation of the neutralisation of HCl and KOH
H+ + OH- –> H2O
Out of Copper, Copper Oxide and Copper Carbonate who can react with HCl to form an insoluble solide
• Copper carbonate • Copper oxide • Copper is not reactive enough
When making magnesium sulfate why do you: • Warm the acid • add MgO until there is some left in the beaker • Filter the misture
• Increase the rate of reaction • Make sure that all the aicd is reacted • Remove excess MgO
What is an observation: zinc + copper sulfate
Brown precipitate
one reason sodium shouldn’t be used in some experiments
• too dangerous • not safe
explain why aluminium alloy bicycle frames do no need prtection from corrosion
• Aluminium alloy has oxide coating • no reaction between metal and water, oxygen
why has phytomining not been widley accepted
• takes a long time • hugh grade ore still availble • not enough land
Why are copper and sodium not used to produce salts with sulfuric acid
Copper —> doesn’t react with sulfuric acid Sodium —> could explode, get too hot, dangerous
When producing a salt what do you use to heat the mixture gently
Water bath
what is an ore
• A rock that contains enough metal • to be worth extracting
what is smelting
• displacemnet • using carbon
what is a native metal
• silver • gold • platinium found in elemental state
what is a displacemnt reaction
• more reactive element can displace • a less reactive element • halogen • metal • from a compound
example of a weak acid
Methanoic acid CH3COOH >< CH3COO- (aq) + H+ (aq)
What is electroplating
• Coat with less reactive metal
What is sacrificial
• Coat with more reactive metal • Will react first