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
111–120 of 423 · Normal
Question 111
4 marks · Normal
Answer and see the solution →The symbol for silver in the periodic table shows:
Use this information to answer the following questions about a silver atom.
(a)[1 mark]State the mass number of this silver atom.
(b)[1 mark]State the atomic number of this silver atom.
(c)[1 mark]Calculate the number of neutrons in this atom.
(d)[1 mark]State the number of electrons in a neutral atom of silver.
Question 112
3 marks · Normal
Answer and see the solution →An atom of calcium has a mass number of 40 and an atomic number of 20.
Calculate the number of:
(a)[1 mark]protons
(b)[1 mark]neutrons
(c)[1 mark]electrons
Question 113
3 marks · Normal
Answer and see the solution →Copper has two naturally occurring isotopes: copper-63 and copper-65.
Explain how you can use the periodic table to determine the numbers of protons, neutrons, and electrons in an atom of copper-65. State the actual numbers for each subatomic particle.
Question 114
2 marks · Normal
Answer and see the solution →State the number of protons and the number of neutrons in an atom of phosphorus-31.
Question 115
4 marks · Normal
Answer and see the solution →(a)[1 mark]The symbol for tin is Sn. An atom of tin has atomic number 50 and mass number 120.
State the number of electrons in a neutral atom of tin.
(b)[1 mark]Calculate the number of neutrons in this tin atom.
(c)[2 marks]Explain, using numbers, why the atomic number and the number of protons in tin are always the same.
Question 116
3 marks · Normal
Answer and see the solution →An atom of zirconium has an atomic number of 40 and a mass number of 91.
Calculate the numbers of protons, neutrons, and electrons in this atom. Show your working.
Question 117
3 marks · Normal
Answer and see the solution →Explain, using an example, how you can determine both the number of electrons and the number of neutrons in an atom using information from the Periodic Table.
Question 118
4 marks · Normal
Answer and see the solution →The table shows data for four elements.
Element Symbol Atomic number Mass number Sulfur S 16 32 Iron Fe 26 56 Nickel Ni 28 59 Krypton Kr 36 84 (a)[2 marks]Use the information to complete the table below by filling in the number of neutrons for each element.
Element Number of neutrons Sulfur Iron Nickel Krypton (b)[1 mark]Which element in the table has the greatest number of protons?
(c)[1 mark]Which element in the table has the same number of protons as electrons?
Question 119
6 marks · Normal
Answer and see the solution →This question is about atoms, molecules, and the structure of the atom.
(a)State what is meant by each of the following terms:
(i)[1 mark]atom
(ii)[1 mark]molecule
(b)[3 marks]The diagram below represents a simple atom.
A simplified atom diagram showing a nucleus at (0,0) and two shells around it. Name the three types of sub-atomic particles found in atoms and state the position of each.
(c)[1 mark]The atomic number of lithium is 3, and its mass number is 7.
Calculate the number of each type of sub-atomic particle in one atom of lithium.
Question 120
6 marks · Normal
Answer and see the solution →A molecule of ammonia has the formula .
(a)[1 mark]State what is meant by the term molecule.
(b)[3 marks]Complete the table below for the sub-atomic particles in a nitrogen atom.
Properties of sub-atomic particles in a nitrogen atom Relative mass Relative charge Position in atom Proton Neutron Electron (c)Given that the atomic number of nitrogen is 7 and the mass number of its most common isotope is 14:
(i)[1 mark]Calculate the number of neutrons in a nitrogen atom.
(ii)[1 mark]Determine the total number of electrons in a molecule of ammonia ().