Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Principles of Chemistry
991 practice questions
Topics covered
- States of Matter102 practice questions
- Elements, Compounds and Mixtures69 practice questions
- Atomic Structure108 practice questions
- The Periodic Table103 practice questions
- Chemical Formulae, Equations and Calculations Part 119 practice questions
- Chemical Formulae, Equations and Calculations Part 2144 practice questions
- Ionic Bonding143 practice questions
- Covalent Bonding68 practice questions
- Metallic Bonding19 practice questions
- Electrolysis198 practice questions
Practice questions
191–200 of 991
Question 191
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.
Question 192
1 mark · Easy
Answer and see the solution →State the position of protons in an atom.
Question 193
3 marks · Easy
Answer and see the solution →(a)[1 mark]Define the term 'isotope'.
(b)[1 mark]Give the meaning of 'mass number'.
(c)[1 mark]Define 'atomic number'.
Question 194
2 marks · Easy
Answer and see the solution →An atom has an atomic number of 9 and a mass number of 19. Calculate the number of neutrons in this atom. Show your working.
Question 195
2 marks · Easy
Answer and see the solution →Explain why the atomic number is important in identifying an element.
Question 196
3 marks · Easy
Answer and see the solution →Properties of Three Sub-Atomic Particles Particle Relative mass Relative charge A 1 +1 B 1/1836 -1 C 1 0 (a)[1 mark]Name particle A.
(b)[1 mark]Name particle B.
(c)[1 mark]State the position in the atom of particle C.
Question 197
1 mark · Easy
Answer and see the solution →State what information the mass number of an atom gives you.
Question 198
3 marks · Easy
Answer and see the solution →(a)[1 mark]Name the sub-atomic particle with a negative charge.
(b)[1 mark]State the relative mass of a proton.
(c)[1 mark]Where is the neutron found in the atom?
Question 199
2 marks · Easy
Answer and see the solution →An atom has 13 protons and 14 neutrons. Calculate the mass number of this atom.
Question 200
2 marks · Normal
Answer and see the solution →State the relative charge and relative mass of a neutron.