Question

. What happens when
a. limestone is heated strongly?
b. carbon dioxide is passed for a short time into a test tube containing lime water?
c. carbon dioxide is passed for a long time into lime water?
d. a burning magnesium is introduced into the jar containing carbon di-oxide gas?
Explain with a balanced chemical equation.
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Answer 1

Answer:

• When limestone is heated strongly, the calcium carbonate it contains absorbs heat (endothermic ) and decomposes to form calcium oxide. ... Calcium oxide (also known as quicklime) is a key ingredient in the making of cement and is also used to make certain types of plaster.

• When carbon dioxide is passed through lime water for a short time,it turns lime water milky due to formation of a white precipitate of calcium carbonate.

• for long duration: When excess of carbon dioxide gas is passed through lime water then the white precipitate calcium carbonate formed first dissolves due to the formation of a soluble salt calcium hydrogen carbonate (Ca(HCO3)2, and the Solution becomes clear again.

• when Mg burn it react with oxygen and form MgO ,now the oxygen is witin the Mg and that is why a burning magnesium ribbon continues to burn when put in a jar filled up of carbon dioxide.