In the balanced reaction for burning magnesium, if one molecule of oxygen ( ext{O}_2 ) is used, how many magnesium atoms are required?
Answer and explanation
Correct answer: Two
The balanced equation is
2 ext{Mg}+ ext{O}_2
ightarrow2 ext{MgO}
. One
ext{O}_2
molecule contains two oxygen atoms, so two Mg atoms form two units of MgO. Therefore, two magnesium atoms are required. Using only one magnesium atom would leave the equation unbalanced.
Frequently asked questions
What is the correct answer to this question?
Two
Why is this the correct answer?
The balanced equation is
2 ext{Mg}+ ext{O}_2
ightarrow2 ext{MgO}
. One
ext{O}_2
molecule contains two oxygen atoms, so two Mg atoms form two units of MgO. Therefore, two magnesium atoms are required. Using only one magnesium atom would leave the equation unbalanced.
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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