In the reaction of calcium oxide with water, only one product is formed and heat is released. What is the correct combined classification of this reaction?
Answer and explanation
Correct answer: Combination and exothermic
The reaction is \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2 + heat}\). Calcium oxide and water combine to form a single product, calcium hydroxide; therefore, it is a combination reaction. Since heat is released, it is exothermic. In contrast, in a decomposition reaction, one compound breaks down into two or more substances.
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What is the correct answer to this question?
Combination and exothermic
Why is this the correct answer?
The reaction is \(\mathrm{CaO + H_2O \rightarrow Ca(OH)_2 + heat}\). Calcium oxide and water combine to form a single product, calcium hydroxide; therefore, it is a combination reaction. Since heat is released, it is exothermic. In contrast, in a decomposition reaction, one compound breaks down into two or more substances.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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