During a reaction in an open container, if a produced gas escapes, why can the measured mass of the container and its remaining contents appear to decrease?
Answer and explanation
Correct answer: The escaped gas is no longer part of the container and contents being weighed.
The law of conservation of mass applies to the complete system. In an open container, a produced gas may escape, so it is not included when the container and its remaining contents are weighed later. Therefore, the measured mass appears lower, but total mass has not been destroyed. Option B is incorrect because mass is not destroyed in a chemical reaction.
Frequently asked questions
What is the correct answer to this question?
The escaped gas is no longer part of the container and contents being weighed.
Why is this the correct answer?
The law of conservation of mass applies to the complete system. In an open container, a produced gas may escape, so it is not included when the container and its remaining contents are weighed later. Therefore, the measured mass appears lower, but total mass has not been destroyed. Option B is incorrect because mass is not destroyed in a chemical reaction.
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.
