Why is the burning of magnesium considered a combination reaction?
Answer and explanation
Correct answer: Magnesium and oxygen combine to form a single product, magnesium oxide.
When magnesium burns, it reacts with oxygen: \(2\mathrm{Mg} + \mathrm{O}_2 \rightarrow 2\mathrm{MgO}\). Two reactants, magnesium and oxygen, combine to form one type of product, magnesium oxide; therefore, it is a combination reaction. Option B describes a decomposition reaction, in which a compound breaks down.
Frequently asked questions
What is the correct answer to this question?
Magnesium and oxygen combine to form a single product, magnesium oxide.
Why is this the correct answer?
When magnesium burns, it reacts with oxygen: \(2\mathrm{Mg} + \mathrm{O}_2 \rightarrow 2\mathrm{MgO}\). Two reactants, magnesium and oxygen, combine to form one type of product, magnesium oxide; therefore, it is a combination reaction. Option B describes a decomposition reaction, in which a compound breaks down.
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.
