In a closed container, a chemical reaction produces a gas and the temperature rises, but no matter escapes. What is the correct conclusion about the total mass of the container and its contents before and after the reaction?
Answer and explanation
Correct answer: The total mass will remain the same
According to the law of conservation of mass, total mass is neither created nor destroyed in a chemical reaction. The gas formed remains inside the closed container, so the combined mass of the container and all its contents is the same before and after the reaction. A rise in temperature indicates an energy change, not an increase in mass.
Frequently asked questions
What is the correct answer to this question?
The total mass will remain the same
Why is this the correct answer?
According to the law of conservation of mass, total mass is neither created nor destroyed in a chemical reaction. The gas formed remains inside the closed container, so the combined mass of the container and all its contents is the same before and after the reaction. A rise in temperature indicates an energy change, not an increase in mass.
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.
