In a closed system, the total mass before and after a reaction remains the same, but the properties of the substances change. What is the correct conclusion?
Answer and explanation
Correct answer: New substances have formed, and the law of conservation of mass applies.
A change in the properties of substances indicates that new substances have formed, so a chemical reaction has occurred. In a closed system, equal total mass before and after the reaction demonstrates the law of conservation of mass. Option B is incorrect because no reaction, or merely a change of position, would not produce substances with new properties.
Frequently asked questions
What is the correct answer to this question?
New substances have formed, and the law of conservation of mass applies.
Why is this the correct answer?
A change in the properties of substances indicates that new substances have formed, so a chemical reaction has occurred. In a closed system, equal total mass before and after the reaction demonstrates the law of conservation of mass. Option B is incorrect because no reaction, or merely a change of position, would not produce substances with new properties.
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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