Question

Which of the following is a chemical change?

• A. Shredding of paper to very small particles
• B. Burning of paper
• C. Breaking a water bottle
• D. Grinding charcoal to powder form

Answer 1

The correct option is B

Burning of paper

Explanation for Correct answer:

B) Burning of paper

• A chemical change is a process in which one or more substances are altered into one or more new and different substances.
• Physical changes are changes affecting the form of a chemical substance, but not it's the chemical composition.
• In option B burning of a paper, a new substance called ash is formed. and this cannot be reversed.

Explanation for incorrect answer:

A) Shredding of paper to very small particles

• Cutting paper is a physical change, as no new substance is generated during this process.
• The page is only changing its size or appearance.

C) Breaking a water bottle

• A physical change occurs when a glass bottle is broken because each broken piece of the bottle is still glass and no new substance is formed.
• Only the shape and size of the bottle change during the process.

D) Grinding charcoal to powder form

• It's a physical change because there is no change in its chemical properties.
• Therefore, it's a physical change

Hence the correct answer option B