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
211–220 of 991
Question 211
1 mark · Easy
Answer and see the solution →Naturally occurring boron is made up of two isotopes: 20% of its atoms have a mass number of 10, and the rest have a mass number of 11. What is the relative atomic mass of boron to the nearest whole number?
Question 212
3 marks · Easy
Answer and see the solution →The element oxygen has three naturally occurring isotopes: ^{16}O, ^{17}O and ^{18}O.
(a)[1 mark]State what is meant by the term 'isotope'.
(b)[1 mark]State one thing that all isotopes of oxygen have the same.
(c)[1 mark]State one way in which isotopes of oxygen differ.
Question 213
2 marks · Easy
Answer and see the solution →A sample of element Y contains 75% of isotope ^{24}Y and 25% of isotope ^{25}Y. Calculate the relative atomic mass of Y. Give your answer to one decimal place.
Question 214
2 marks · Easy
Answer and see the solution →Explain why isotopes of calcium all react in the same way, even though they have different numbers of neutrons.
Question 215
3 marks · Easy
Answer and see the solution →The table shows the isotopes of element Z and their percentage abundances:
Isotopes of Z Isotope Relative Mass Percentage Abundance Z-31 31 60 Z-32 32 40 (a)[2 marks]Calculate the relative atomic mass of Z. Give your answer to one decimal place.
(b)[1 mark]Which isotope of Z is most abundant?
Question 216
1 mark · Easy
Answer and see the solution →State the similarity between all isotopes of nitrogen.
Question 217
3 marks · Easy
Answer and see the solution →Below is information about two isotopes of lithium: Isotope 1: ^{6}Li, abundance 8%. Isotope 2: ^{7}Li, abundance 92%.
(a)[1 mark]Write the equation for calculating the relative atomic mass of lithium using these data.
(b)[2 marks]Calculate the relative atomic mass of lithium to one decimal place.
Question 218
2 marks · Easy
Answer and see the solution →A sample contains atoms of oxygen-16 () and oxygen-18 (). Both are isotopes of oxygen.
State the number of protons and the number of neutrons in an atom of .
Question 219
2 marks · Normal
Answer and see the solution →State the number of protons and the number of neutrons in an atom of magnesium-25 ().
Question 220
4 marks · Normal
Answer and see the solution →Use the information below to answer the questions about isotopes.
(a)[1 mark]Give the definition of isotopes.
(b)[2 marks]State one similarity and one difference between the isotopes and .
(c)[1 mark]Explain why the chemical properties of the two isotopes are the same.