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2e) Hydrogen and water (the use of anhydrous copper (II) sulfate in the…
2e) Hydrogen and water
Reactions of dilute HCl and dilute sulfuric acids with...
aluminium
no reaction
zinc
ZnCl2 + H
magnesium
effervescence, fizzing, bubbling. produces a gas that pops
Mg + 2HCl →MgCl2 + H2
iron
effervescence, orange/brown colour
iron (III) chloride - transition metal no group number
2Fe (III) + 6HCl →2FeCl3 + 3H2 - gases are diatomic (X2)
combustion of hydrogen
hydrogen + oxygen → water
H2 + O2 → H2O
the use of anhydrous copper (II) sulfate in the chemical test for water
CuSO4
.
5H2O → CuSO4 + 5H2O
dot to represent a loose bond
anhydrous CuSO4 powder white
hydrated CuSO4 crystals - blue
anhydrous = without H2O
when water is added to white anhydrous copper sulphate, the copper turns blue and heat is given out
EXOTHERMIC reaction
physical test to show whether water is pure
test the boiling point and its freezing point
if it boils at 100 degrees C and freezes at 0 degrees C then it is pure water