Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Atoms and molecules
20 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →State the meaning of the following terms:
(a)[1 mark]atom
(b)[1 mark]molecule
Question 2
5 marks · Hard
Answer and see the solution →Ammonia has the chemical formula NH₃.
(a)[1 mark]State what an atom is.
(b)[1 mark]Describe what is meant by a molecule.
(c)[1 mark]How many atoms are present in one molecule of ammonia?
(d)[1 mark]Write the names of the elements that form a molecule of ammonia.
(e)[1 mark]Explain, using ammonia as an example, how a molecule is different from an atom.
Question 3
2 marks · Hard
Answer and see the solution →Give one similarity and one difference between atoms and molecules.
(a)[1 mark]State one way in which atoms and molecules are similar.
(b)[1 mark]State one way in which atoms and molecules are different.