Skip to main content

How it works Subjects Pricing

Open app Sign in Start free

Subjects
0653 Combined Science
Question 21

Cambridge (CAIE) · IGCSE

Combined Science question 21

0653/21 · May/June 2025 · Multiple Choice (Extended)

Syllabus topics

Chemical reactions

Question 21

0653/21 · May/June 2025

1 mark

Free account

The scheme, beside the question.

No second tab and no pdf hunt: a free account opens the official Cambridge mark scheme next to the question and marks what you wrote against it, point by point. Every question you have done stays ticked.

5 marked answers a day, free. No card.

Pick it up in the grind.

The official mark scheme sits beside the question there, and what you write comes back marked against it.

Open the question

The paper it came from

Paper: 0653/21 · May/June 2025
Questions: 40
Total: 40 marks
Duration: 45 min
Grade: own-series threshold

Sit the whole paper against the clock once you have an account.

Open the whole paper

Paper Grinder

Grind real Cambridge past papers, marked point by point against the official scheme.

Product

How it works
Subjects
Pricing
Contact

Legal

Privacy
Terms

Paper Grinder is an independent study tool. It is not affiliated with, authorised by, or endorsed by Cambridge International Education, whose past papers and mark schemes remain the property of their owners, and it responds promptly to rights-holder requests.

© 2026 Paper Grinder