Question

A compound A is used in the manufacture of cement. When dissolved in water, it evolves a large amount of heat and forms compound B.
I) Identify A and B
II) Write the chemical equation for the reaction of A with water
III) List two types of reaction in which this reaction may be classified

Answer 1

$\huge \underline \bold \color{coral} \mathfrak{Answer}$

1. A is calcium oxide [CaO] and B is calcium hydroxide [Ca(OH)2].
2. CaO + H2O ------ Ca(OH)2
3. Exothermic and combination reactions.

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Answer 2

The three answers are solved and explained below.

I) Compound A is calcium oxide or quick lime ($CaO$), and compound B is calcium hydroxide ($Ca(OH)_{2}$).

II) The reaction is as follows:

$CaO+H_{2}O$ → $Ca(OH)_{2}$

III) This reaction can be classified as an exothermic reaction because it is evolving heat and a combination reaction as two compounds are combining to form a new compound.

• This method is used industrially in the manufacturing of cement and when quick lime is mixed with water, it forms calcium hydroxide with the evolution of heat.