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CHEMISTRY
Group Members: WanQin, Delia, PeiPei & Marie

Hey , You are welcoming here .
This is our chemistry project this year (2012).
Our topic is on heating of metal carbonates,
we hope that you will learn something from here.

Thursday, 6 September 2012, 23:03
Heat on Metal Carbonates

Thermal decomposition
Metal carbonates such as calcium carbonate break down when heated strongly. This is called thermal decomposition. It is a endothermic reaction as heat is required to break chemical bonds in the compound undergoing decomposition.
calcium carbonate right facing arrow with heat calcium oxide + carbon dioxide
CaCO3right facing arrow with heat CaO + CO2

Some compound are more difficult to decompose by heating than others. This mean that these compounds are more stable to heat than others.Thermal stability of metal carbonate is in relation to the position  of the metal in the reactivity series. The more reactive metals-carbonate are harder to decompose.Metal-carbonate after sodium form metal oxide and carbon dioxide upon heating all in the exception of silver carbonate which decompose into silver and carbon dioxide upon heating. 



 Metal Carbonate
 Observation
 Potassium Carbonate, K2CO3
 no reaction
 Sodium Carbonate, Na2CO3
 no reaction
 Calcium Carbonate CaCO3
 decompose into metal oxide and carbon dioxide upon heating
 Magnesium Carbonate MgCO3
 decompose into metal oxide and carbon dioxide upon heating
 Zinc carbonate ZnCO3
 decompose into metal oxide and carbon dioxide upon heating
 Iron (ll) carbonate FeCO3
 decompose into metal oxide and carbon dioxide upon heating
 Lead (II) carbonate PbCO3
 decompose into metal oxide and carbon dioxide upon heating
 Copper(II) carbonate CuCO3
 decompose into metal oxide and carbon dioxide upon heating
 Silver carbonate Ag2CO3
 decomposes into silver, oxygen gas & carbon dioxide upon heating




credits: Chemistry textbook
              http://www.bbc.co.uk/schools/gcsebitesize/science/aqa_pre_2011/rocks/limestonerev1.shtml
                   http://en.wikipedia.org/wiki/Thermal_decomposition