Question

2 Lime (calcium oxide) is produced by heating limestone (calcium carbonate) in a hot kiln.
Carbon dioxide gas is given off as a waste product.
a) Is this chemical reaction endothermic or exothermic?
b) Write a word equation for the production of lime.
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Answer 1

Answer:

Answer a): This reaction is endothermic as it requires heating the limestone.

b): Calcium Carbonate = Calcium Oxide + Carbon Dioxide.