Question

a solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B, and a gas, C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen. Based on these observations, can we determine whether solids A and B and the gas C are elements or compounds? Explain your conclusions for each substance

Answer 1

Answer:

Potassium chlorate decomposes to form potassium chloride and oxygen in the presence of manganese dioxide.

Here the reaction :

2KClO3===>2KCl +3O2

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1)The compound A is Potassium chloride (KClO3).

2)The compound B is Potassium chloride (KCl).

3)The gas evolved is Oxygen (O2).

4)The black substance X is manganese dioxide (MnO2).

FUNCTION:

It increases the rate of the chemical reaction without being used up in the reaction.

5)The general name of substances like X is CATALYSTS.

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