How are substances identified in a chemical reaction?
Answer and explanation
Correct answer: By their chemical formulae
In a chemical equation, every reactant and product is represented by its chemical formula, such as \(H_2O\) for water and \(CO_2\) for carbon dioxide. Therefore, a substance is identified by its chemical formula. State symbols such as \((s)\), \((l)\), and \((g)\) show only the physical state, not the identity of the substance. Exam tip: Always write correct formulae while writing a chemical equation.
Frequently asked questions
What is the correct answer to this question?
By their chemical formulae
Why is this the correct answer?
In a chemical equation, every reactant and product is represented by its chemical formula, such as \(H_2O\) for water and \(CO_2\) for carbon dioxide. Therefore, a substance is identified by its chemical formula. State symbols such as \((s)\), \((l)\), and \((g)\) show only the physical state, not the identity of the substance. Exam tip: Always write correct formulae while writing a chemical equation.
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.
