2.25 describe the reactions of dilute hydrochloric and dilute sulfuric acids with magnesium, aluminium, zinc and iron
The rule "MASH" tells us that when a metal reacts with an acid, a salt will be produced, as well as hydrogen.
Metal + Acid --> Salt + Hydrogen
e.g.
Mg(s) + 2HCl(aq) --> MgCl2 + H2
2.26 describe the combustion of hydrogen
The combustion of hydrogen is its reaction with oxygen. It is exothermic, so a lot of energy is produced, as well as pure water.
2H2 + O2 --> 2H2O
2.27 describe the use of anhydrous copper(II) sulfate in the chemical test for water
If anhydrous copper sulphate changes from white to blue, it has become hydrous copper sulphate and it contains water.
2.28 describe a physical test to show whether water is pure.
Heat the water until it boils, with a thermometer. If it boiled at 100℃ exactly, it is pure water.
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Section 3 a) Specification
3.1 explain the terms homologous series, hydrocarbon, saturated, unsaturated, general formula and isomerism. A homologous series is a grou...
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The group 7 elements, also known as halogens, are F, fluorine, Cl, chlorine, Br, bromine, I, iodine, and At, astatine. They all have antimic... -
Metals can be placed in an order of most to least reactive, called the reactivity series. This can be remembered using an acronym: Plea... -
Particles of a substance can be present in different physical states, the states of matter. They are solid, liquid and gas, and increasing ...
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