Last updated on Oct 23, 2026

Compounds (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Quizzes

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Compounds

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What is a compound?

Two or more elements chemically joined

How do the properties of a compound compare to its elements?

They are chemically different

What is the minimum number of elements needed to form a compound?

Two

Which elements are present in water ( $H_2O$ )?

Hydrogen and Oxygen

How many atoms in total are in one molecule of water ( $H_2O$ )?

3

How many hydrogen atoms are in one molecule of water ( $H_2O$ )?

2

Which elements are present in table salt ( $NaCl$ )?

Sodium and Chlorine

How many atoms in total are in one molecule of table salt ( $NaCl$ )?

2

Which elements are in sulfuric acid ( $H_2SO_4$ )?

Hydrogen, Sulfur and Oxygen

How many elements are in sulfuric acid ( $H_2SO_4$ )?

3

How many oxygen atoms are in one molecule of sulfuric acid ( $H_2SO_4$ )?

4

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Revision Notes by Topics

Simple Model of the Atom

The Periodic Table

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Model Answers by Topics

Simple Model of the Atom

The Periodic Table

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Flashcards by Topics

Simple Model of the Atom

The Periodic Table

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Exam Questions by Topics

Simple Model of the Atom

The Periodic Table

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