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Chemistry EMPA revision
Reactions of carbonates:

Metal carbonate Metal oxide + Carbon dioxide
o CaCO3 CaO + CO2
Metal carbonate + Acid Salt + Water + Carbon Dioxide
o CaCO3 + H2SO4 CaSO4 + H2O + CO2

Enthalpy change:

Enthalpy of formation: Enthalpy change when one mole of a substance…

Page 2

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o P = Pa, V = m3, T = K, R = 8.31 JK-1 mol-1.
o Rearrange to make:
V= nRT
n = PV
Empirical formula = Mass or percentage of element
o Divide both answers by the smallest.
Concentration = number of moles
Volume (dm3)

Page 3

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Colourless Brown.
Carbon dioxide = Bubble gas through lime water and turns it milky.
CO2 (g) + Ca(OH)2 (aq) CaCO3 (s) + H2O (l)
Sulphur dioxide SO2 = Turns damp blue litmus paper red
Turns litmus solution blue
Bubbles through potassium dichromate (VI) solution.
2H (aq) + 3SO2 (g) +…


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