Answer:
(a) Calcium oxide, CaO.
(b) Calcium hydroxide, Ca(OH)2
(c) Lime water.
(d) CaO + H2O → Ca(OH)2
(e) Change in temperature.
When water is added gradually to a white solid X. A hissing sound and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during whitewashing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory. (a) What could be solid X? Write its chemical formula. (b) What could be product Y? Write its chemical formula. (c) What is the common name of the solution of Y which is used for testing carbon dioxide gas? (d) Write a chemical equation of the reaction which takes place on adding water to solid X. (e) Which characteristics of chemical reactions are illustrated by this example?
When water is added gradually to a white solid X. A hissing sound and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during whitewashing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory. (a) What could be solid X? Write its chemical formula. (b) What could be product Y? Write its chemical formula. (c) What is the common name of the solution of Y which is used for testing carbon dioxide gas? (d) Write a chemical equation of the reaction which takes place on adding water to solid X. (e) Which characteristics of chemical reactions are illustrated by this example?