A student writes \(H_2O_2\) instead of \(H_2O\) while balancing the equation \(H_2 + O_2 \rightarrow H_2O\). What is the correct way to correct this error?
Answer and explanation
Correct answer: Use coefficients only: \(2H_2 + O_2 \rightarrow 2H_2O\)
When balancing an equation, chemical formulae and subscripts must not be changed because doing so changes the substance. \(H_2O\) is water, whereas \(H_2O_2\) is hydrogen peroxide. The equation is balanced by using coefficients only: \(2H_2 + O_2 \rightarrow 2H_2O\). It has 4 hydrogen atoms and 2 oxygen atoms on each side. Changing \(O_2\) to \(O\) is also incorrect because it changes the chemical formula of oxygen.
Frequently asked questions
What is the correct answer to this question?
Use coefficients only: \(2H_2 + O_2 \rightarrow 2H_2O\)
Why is this the correct answer?
When balancing an equation, chemical formulae and subscripts must not be changed because doing so changes the substance. \(H_2O\) is water, whereas \(H_2O_2\) is hydrogen peroxide. The equation is balanced by using coefficients only: \(2H_2 + O_2 \rightarrow 2H_2O\). It has 4 hydrogen atoms and 2 oxygen atoms on each side. Changing \(O_2\) to \(O\) is also incorrect because it changes the chemical formula of oxygen.
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.
