what happens when(only balanced chemical equation)
1. calcium carbonate is heated
2. iron fillings react with sulphur powder
3. sodium reacts with cold water
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Explanation:
Calcium carbonate ( CaCO3 ) when heated strongly , gives quicklime ( CaO ) and carbon dioxide ( CO2) . This reaction is thermal decomposition reaction . ... Thus it is a Endothermic Reaction .
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1.
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
CaCO3 →CaO+CO2.
2.
When iron filings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide (FeS). It is a new substance which has properties entirely different from Fe and S.
Fe + S → FeS (heat)
3.
When sodium metal comes into contact with water, it displaces hydrogen gas as follows:
2Na(s)+2H2O→2NaOH(aq)+H2(g)
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