Mass number and isotopes: AQA A‑Level Chemistry questions

AQA A-Level Chemistry past-paper questions on 3.1.1.2 Mass number and isotopes, 2008–2025, with mark schemes and examiner’s reports where available.

All 139 questions on Mass number and isotopes, as a list

June 2025, Paper 1, Q07.7 (2 marks): Compound Q is found in crude oil and has the molecular formula C33H34N4VO4 A sample of Q is ionised by electrospray ionisation in a time of flight (TOF) mass sp
June 2025, Paper 1, Q07.8 (2 marks): A sample of vanadium contains only 49V and 51V The relative atomic mass of vanadium in this sample is 50.97 Calculate the percentage abundance of 51V in this sa
June 2025, Paper 3, Q12 (1 mark): A sample of UF6 consists of molecules containing 19F and either 235U or 238U atoms. The relative molecular mass of the sample is 351.43 What is the percentage a
June 2025, AS Paper 1, Q03.3 (2 marks): Give the meaning of the term relative atomic mass. [2 marks]
June 2025, AS Paper 1, Q03.4 (3 marks): A TOF mass spectrometer is used to determine the relative atomic mass of a metal. Explain why the sample of the metal must be ionised before passing into the fl
June 2025, AS Paper 1, Q03.5 (1 mark): State the m/z value of the ion that would be the last to reach the detector. [1 mark]
June 2025, AS Paper 1, Q03.6 (2 marks): Calculate the relative atomic mass of this sample of metal. Give your answer to 1 decimal place. [2 marks] Relative atomic mass
June 2025, AS Paper 1, Q03.7 (3 marks): These are the data for one of the isotopes in this analysis. Length of flight tube = 0.850 m Time of flight = 6.41 × 10–4 s KE = 7.59 × 10–20 J The kinetic ener
June 2024, Paper 1, Q01.2 (3 marks): Tellurium has a relative atomic mass of 127.6 Iodine has a relative atomic mass of 126.9 Define relative atomic mass. Suggest one property of tellurium that jus
June 2024, Paper 1, Q01.3 (1 mark): A sample of tellurium is analysed in a time of flight (TOF) mass spectrometer using electron impact ionisation. Give an equation, including state symbols, for t
June 2024, Paper 1, Q01.4 (5 marks): In the TOF mass spectrometer an ion of an isotope of tellurium, with mass number y, travels along a 1.25 m flight tube with a kinetic energy of 1.88 x 10–12 J T
June 2024, Paper 1, Q01.5 (1 mark): Tellurium has several other isotopes. Two of these isotopes are 126Te and 124Te A different sample of tellurium is analysed using a TOF mass spectrometer. Which
June 2024, AS Paper 1, Q06.2 (1 mark): Give an equation, including state symbols, for the process that occurs during the ionisation of bromine. [1 mark]
June 2024, AS Paper 1, Q06.3 (3 marks): Bromine exists as two isotopes, 79Br and 81Br, which exist in equal abundance. Figure 1 shows an incomplete mass spectrum for this sample of bromine. Figure 1 C
June 2024, AS Paper 1, Q06.4 (1 mark): State how the detector enables the relative abundance of each ion to be determined. [1 mark]
June 2024, AS Paper 1, Q20 (1 mark): Samples of four different substances are analysed using time of flight mass spectrometry. In each case, the samples are ionised to form ions with a single posit
June 2024, AS Paper 1, Q21 (1 mark): Which isotope has 2 more protons and 3 more neutrons than an atom of 112Cd? [1 mark] A Cd 48 115 B Sn 50 115 C Sn 50 117 D Sb 51 117
June 2023, Paper 1, Q09.1 (1 mark): Give the equation, including state symbols, for the formation of Sr + ions from Sr atoms by electron impact. [1 mark]
June 2023, Paper 1, Q09.2 (5 marks): A sample of strontium is analysed by TOF mass spectrometry. The sample is ionised using electron impact. The ions are accelerated to have a kinetic energy (KE)
June 2023, Paper 1, Q09.3 (2 marks): Explain how the ions are detected in the TOF mass spectrometer. State how the relative abundance of the ions is determined. [2 marks] How ions are detected How
June 2023, Paper 1, Q09.4 (3 marks): A sample of strontium contains three isotopes, 86Sr, 87Sr and 88Sr 82% of the sample is 88Sr The other isotopes are in a 1:2 ratio of 86Sr : 87Sr Calculate the
June 2023, Paper 1, Q09.5 (1 mark): Electrospray ionisation is used instead of electron impact for the ionisation of a protein in a mass spectrometry experiment. Suggest why. [1 mark]
June 2023, AS Paper 1, Q02.5 (4 marks): A sample of strontium is made up of only three isotopes: 86Sr, 87Sr and 88Sr This sample contains 83.00% by mass of 88Sr This sample of strontium has Ar = 87.73
June 2023, AS Paper 1, Q07.1 (5 marks): Compound X is dissolved in a polar, volatile solvent and is ionised by electrospray ionisation. Each ion is accelerated so that it has a kinetic energy of 1.36
June 2023, AS Paper 1, Q07.2 (1 mark): State the meaning of the term electron impact ionisation. [1 mark]
June 2023, AS Paper 1, Q07.3 (2 marks): Identify the ion formed from this mixture that reaches the detector last. Justify your answer. [2 marks] Ion that reaches detector last Justification
June 2023, AS Paper 1, Q07.4 (2 marks): State how the ions are detected, and how the abundance of each ion is measured, in a TOF mass spectrometer. [2 marks] How ions are detected How abundance is mea
June 2023, AS Paper 1, Q09 (1 mark): Which atom contains the most neutrons? [1 mark] A 54Cr B 55Mn C 57Fe D 58Ni Use this information for Questions 10 and 11. A student completes a titration to det
June 2022, Paper 1, Q02.1 (2 marks): Define the term relative atomic mass. [2 marks]
June 2022, Paper 1, Q02.2 (2 marks): The relative atomic mass of a sample of rhenium is 186.3 Table 2 shows information about the two isotopes of rhenium in this sample. Table 2 Relative isotopic m
June 2022, Paper 1, Q02.3 (1 mark): State why the isotopes of rhenium have the same chemical properties. [1 mark]
June 2022, Paper 1, Q02.4 (5 marks): A 185Re+ ion with a kinetic energy of 1.153 × 10−13 J travels through a 1.450 m flight tube. The kinetic energy of the ion is given by the equation KE = 1 2 mv
June 2022, Paper 1, Q02.5 (2 marks): State how the relative abundance of 185Re+ is determined in a TOF mass spectrometer. [2 marks]
June 2022, Paper 1, Q05.4 (2 marks): The mass spectrum of the element phosphorus has a peak at m z = 124 Give the formula of the species responsible for this peak. [2 marks]
June 2022, AS Paper 1, Q05 (5 marks): A sample of antimony is analysed in a time of flight (TOF) mass spectrometer and is found to contain two isotopes,121Sb and 123Sb After electron impact ionisati
June 2022, AS Paper 1, Q09 (1 mark): Which atom has two more protons and two more neutrons than Cr 24 52 ? [1 mark] A Cr 26 54 B Cr 26 56 C Fe 26 54 D Fe 26 56
June 2022, AS Paper 1, Q13 (1 mark): Which statement about isotopes of an element is not correct? [1 mark] A They have the same chemical properties. B They have the same number of electrons in ions
November 2021, Paper 1, Q02.1 (1 mark): Define the mass number of an atom. [1 mark]
November 2021, Paper 1, Q02.2 (2 marks): Complete Table 3 to show the numbers of neutrons and electrons in the species shown. [2 marks] Table 3 Number of protons Number of neutrons Number of electrons
November 2021, Paper 1, Q02.3 (3 marks): A sample of titanium contains four isotopes, 46Ti, 47Ti, 48Ti and 49Ti This sample has a relative atomic mass of 47.8 In this sample the ratio of abundance of i
November 2021, Paper 3, Q07 (1 mark): Which does not involve the absorption of ultraviolet radiation or visible light? [1 mark] A The blue appearance of copper(II) sulfate solution in daylight. B Th
November 2021, AS Paper 1, Q01.2 (4 marks): A sample of tin is analysed in a time of flight mass spectrometer. The sample is ionised by electron impact to form 1+ ions. Table 1 shows data about the four p
November 2021, AS Paper 1, Q11 (1 mark): In a time of flight mass spectrometer, molecule X is ionised using electrospray ionisation. What is the equation for this ionisation? [1 mark] A X(l) + e– → X+(
November 2021, AS Paper 1, Q21 (1 mark): Which atom has one more proton and two more neutrons than P 15 31 ? [1 mark] A P 16 33 B P 16 34 C S 16 33 D S 16 34
November 2020, Paper 1, Q02.2 (4 marks): A sample of chromium containing the isotopes 50Cr, 52Cr and 53Cr has a relative atomic mass of 52.1 The sample contains 86.1% of the 52Cr isotope. Calculate the
November 2020, Paper 1, Q02.3 (2 marks): State, in terms of the numbers of fundamental particles, one similarity and one difference between atoms of 50Cr and 53Cr [2 marks] Similarity Difference
November 2020, Paper 1, Q02.4 (2 marks): Give two reasons why it is necessary to ionise the isotopes of chromium before they can be analysed in a TOF mass spectrometer. [2 marks] 1 2
November 2020, Paper 1, Q02.5 (5 marks): A 53Cr+ ion travels along a flight tube of length 1.25 m The ion has a constant kinetic energy (KE) of 1.102 × 10–13 J 2 = KE 2 m = mass of the ion / kg v = spe
November 2020, AS Paper 1, Q03.2 (2 marks): A sample of krypton is ionised using electron impact. The mass spectrum of this sample of krypton has four peaks. Table 2 shows data from this spectrum. Table 2
November 2020, AS Paper 1, Q03.3 (4 marks): In a TOF mass spectrometer, ions are accelerated to the same kinetic energy (KE). The kinetic energy of an ion is given by the equation KE = 1 2 mv 2 Where: KE
November 2020, AS Paper 1, Q09 (1 mark): Which atom has the smallest number of neutrons? [1 mark] A 3H B 4He C 5He D 4Li
June 2019, Paper 1, Q02.1 (4 marks): Describe the process of electrospray ionisation. Give an equation to represent the ionisation of P in this process. [4 marks] Description Equation
June 2019, Paper 1, Q02.2 (1 mark): What is the relative molecular mass of P? Tick () one box. [1 mark] 555 556 557
June 2019, Paper 1, Q02.3 (5 marks): A molecule Q is ionised by electron impact in a TOF mass spectrometer. The Q+ ion has a kinetic energy of 2.09 x 10–15 J This ion takes 1.23 x 10–5 s to reach t
June 2019, AS Paper 1, Q02.1 (3 marks): Describe how the molecules are ionised using electrospray ionisation. [3 marks]
June 2019, AS Paper 1, Q02.2 (1 mark): Give the formula of the ion that reaches the detector first in the TOF mass spectrometer. [1 mark]
June 2019, AS Paper 1, Q02.3 (1 mark): A sample of germanium is analysed in a TOF mass spectrometer using electron impact ionisation. Give an equation, including state symbols, for the process that o
June 2019, AS Paper 1, Q02.4 (5 marks): In the TOF mass spectrometer, a germanium ion reaches the detector in 4.654 × 10 –6 s The kinetic energy of this ion is 2.438 × 10 –15 J The length of the fligh
June 2019, AS Paper 1, Q03.2 (1 mark): An atom has 2 more protons and 3 more neutrons than an atom of 52Cr. Deduce the symbol, including the mass number and the atomic number, for this atom. [1 mark]
June 2019, AS Paper 1, Q03.3 (3 marks): A sample of chromium contains four isotopes and has a relative atomic mass of 52.09 Table 2 shows the mass number and the percentage abundance of three of these
June 2018, Paper 1, Q04.6 (4 marks): A sample of strontium has a relative atomic mass of 87.7 and consists of three isotopes, 86Sr, 87Sr and 88Sr In this sample, the ratio of abundances of the isot
June 2018, Paper 1, Q04.7 (1 mark): A time of flight (TOF) mass spectrum was obtained for a sample of barium that contains the isotopes 136Ba, 137Ba and 138Ba The sample of barium was ionised by e
June 2018, Paper 1, Q04.8 (5 marks): A 137Ba+ ion travels through the flight tube of a TOF mass spectrometer with a kinetic energy of 3.65 × 10–16 J This ion takes 2.71 × 10–5 s to reach the detect
June 2018, AS Paper 1, Q08.1 (5 marks): The 79Br+ ions took 6.69 x 10–4 s to travel through the flight tube. Calculate the mass, in kg, of one ion of 79Br+ Calculate the time taken for the 81Br+ ions
June 2018, AS Paper 1, Q08.2 (2 marks): Explain how ions are detected and relative abundance is measured in a TOF mass spectrometer. [2 marks]
June 2018, AS Paper 2, Q06.2 (2 marks): Compound A has a relative molecular mass (Mr) of 134.5 The main isotope of hydrogen is 1H The main isotope of carbon is 12C Chlorine consists of two common isot
June 2017, Paper 1, Q04.1 (2 marks): Calculate the relative atomic mass of titanium in this sample. Give your answer to one decimal place. [2 marks Relative atomic mass of titanium in this sample
June 2017, Paper 1, Q04.2 (2 marks): Write an equation, including state symbols, to show how an atom of titanium is ionised by electron impact and give the m/z value of the ion that would reach the
June 2017, Paper 1, Q04.3 (1 mark): Calculate the mass, in kg, of one atom of 49Ti The Avogadro constant L = 6.022 × 1023 mol−1 [1 mark Mass kg
June 2017, Paper 1, Q04.4 (3 marks): In a TOF mass spectrometer the time of flight, t, of an ion is shown by the equation t = E m d 2 In this equation d is the length of the flight tube, m is the m
June 2017, AS Paper 1, Q01.4 (3 marks): A sample of nickel was analysed in a time of flight (TOF) mass spectrometer. The sample was ionised by electron impact ionisation. The spectrum produced showed
June 2017, AS Paper 1, Q12 (1 mark): 1 2 Which statement about time of flight mass spectrometry is correct? [1 mark] A The current in the detector is proportional to the ion abundance B Sample part
June 2017, AS Paper 1, Q13 (1 mark): 1 3 Chlorine exists as two isotopes 35Cl and 37Cl in the ratio 3:1 Which statement about peaks in the mass spectrum of Cl2 is correct? [1 mark] A Peaks at m/z =
June 2016, AS Paper 1, Q06.1 (3 marks): Explain how ions are accelerated, detected and have their abundance determined in a time of flight (TOF) mass spectrometer. [3 marks
June 2016, AS Paper 1, Q06.2 (1 mark): Calculate the mass, in kg, of a single 52Cr+ ion. Assume that the mass of a 52Cr+ ion is the same as that of a 52Cr atom. (The Avogadro constant L = 6.022 x 102
June 2016, AS Paper 1, Q06.3 (2 marks): In a TOF mass spectrometer the kinetic energy (KE) of a 52Cr+ ion was 1.269 x 10−13 J Calculate the velocity of the ion using the equation. KE= 1 2mv2 (m = mass
June 2016, AS Paper 1, Q06.4 (2 marks): Bromine has two isotopes, 79Br and 81Br, in approximately equal abundance. In a TOF mass spectrometer bromine forms ions with formula [Br2]+ Sketch the pattern
June 2016, AS Paper 1, Q06.5 (4 marks): A sample of xenon has Ar = 131.31. The sample consists of four isotopes. The abundances of three of the isotopes are shown in Table 3. The data for one of the i
June 2016, AS Paper 1, Q13 (1 mark): Ions of two isotopes of iron are 53Fe2+ 56Fe2+ Which statement is correct? [1 mark A The ions of both the isotopes have the electronic configuration 1s22s22p63s
Specimen, Paper 2, Q03.7 (2 marks): Mr =
Specimen, Paper 3, Q05.2 (4 marks): Section B Answer all questions in this section. Only one answer per question is allowed. For each answer completely fill in the circle alongside the appropriate
June 2016, CHEM4 (old spec), Q4(a)(i) (1 mark): Chlorine exists as the isotopes 35Cl and 37Cl in a 3:1 ratio. Calculate the m/z value of the most abundant molecular ion peak in the mass spectrum of X. [1 mark
June 2016, CHEM1 (old spec), Q1(b)(ii) (2 marks): Describe how the ions are detected. [2 marks]
June 2016, CHEM1 (old spec), Q1(c) (2 marks): Table 1 gives the relative abundance of each isotope in the mass spectrum of a sample of silicon, recorded using a high-resolution mass spectrometer. Table 1 Us
June 2016, CHEM1 (old spec), Q1(d) (4 marks): A second mass spectrum was recorded for the same sample of silicon. The energy of the electrons from the electron gun was higher for this second spectrum. State
June 2015, CHEM1 (old spec), Q2(b)(i) (3 marks): Use Figure 1 to calculate the relative atomic mass of this sample of tellurium. Give your answer to one decimal place. [3 marks]
June 2015, CHEM1 (old spec), Q2(b)(ii) (1 mark): Suggest what might cause the relative atomic mass of this sample to be different from the relative atomic mass given in the Periodic Table. [1 mark]
June 2015, CHEM1 (old spec), Q2(c) (1 mark): Write an equation for the reaction that occurs when a tellurium ion hits the detector. [1 mark]
June 2015, CHEM1 (old spec), Q2(d) (2 marks): State the m/z value of the ions that produce the biggest current at the detector when the spectrum in Figure 1 is recorded. Give a reason for your answer. [2 ma
June 2015, CHEM1 (old spec), Q2(e) (2 marks): The mass spectrum of tellurium also has a small peak at m/z = 64 Explain the existence of this peak. [2 marks]
June 2015, CHEM1 (old spec), Q2(f) (2 marks): Predict whether the atomic radius of 124Te is larger than, smaller than or the same as the atomic radius of 130Te Explain your answer. [2 marks] Atomic radius o
June 2015, CHEM1 (old spec), Q7(e)(ii) (1 mark): Give the formula of a molecule that has the same number of electrons as the azide ion. [1 mark]
June 2014, CHEM1 (old spec), Q1(b)(i) (2 marks): Calculate the percentage abundance of 10B in this naturally occurring sample of boron. [2 marks]
June 2014, CHEM1 (old spec), Q1(b)(ii) (1 mark): State, in terms of fundamental particles, why the isotopes 10B and 11B have similar chemical reactions. [1 mark]
June 2013, CHEM1 (old spec), Q1(b) (3 marks): Use data from the diagram to calculate the relative atomic mass of X. Give your answer to one decimal place.
June 2013, CHEM1 (old spec), Q1(c) (1 mark): Identify the ion responsible for the peak at 72 (1 mark)
June 2013, CHEM1 (old spec), Q1(e) (2 marks): In a mass spectrometer, the relative abundance of each isotope is proportional to the current generated by that isotope at the detector. Explain how this curren
June 2013, CHEM1 (old spec), Q1(f) (1 mark): X and Zn are different elements. Explain why the chemical properties of 70X and 70Zn are different. (1 mark)
January 2013, CHEM1 (old spec), Q1(a) (1 mark): State the meaning of the term mass number of an isotope. (1 mark)
January 2013, CHEM1 (old spec), Q1(b) (1 mark): Give the symbol of the element that has an isotope with a mass number of 68 and has 38 neutrons in its nucleus. (1 mark)
January 2013, CHEM1 (old spec), Q1(c)(i) (2 marks): State what happens to the sample in the parts labelled P and Q. P Q (2 marks)
January 2013, CHEM1 (old spec), Q1(c)(ii) (2 marks): In a mass spectrometer, the isotopes of an element are separated. Two measurements for each isotope are recorded on the mass spectrum. State the two measurement
January 2013, CHEM1 (old spec), Q1(d)(i) (3 marks): Calculate the relative atomic mass of R. Give your answer to one decimal place.
January 2013, CHEM1 (old spec), Q1(d)(ii) (1 mark): Identify R. (1 mark)
January 2013, CHEM1 (old spec), Q1(d)(iii) (1 mark): All the isotopes of R react in the same way with concentrated nitric acid. State why isotopes of an element have the same chemical properties. (1 mark)
June 2012, CHEM1 (old spec), Q1(a) (2 marks): State the number of protons and the number of neutrons in an atom of the isotope 85Rb Number of protons Number of neutrons (2 marks)
June 2012, CHEM1 (old spec), Q1(b)(i) (2 marks): Explain how the gaseous atoms of rubidium are ionised in a mass spectrometer.
June 2012, CHEM1 (old spec), Q1(e) (3 marks): A sample of rubidium contains the isotopes 85Rb and 87Rb only. The isotope 85Rb has an abundance 2.5 times greater than that of 87Rb Calculate the relative atom
June 2012, CHEM1 (old spec), Q1(f) (2 marks): By reference to the relevant part of the mass spectrometer, explain how the abundance of an isotope in a sample of rubidium is determined. Name of relevant part
January 2012, CHEM1 (old spec), Q7(a) (4 marks): Use this spectrum to calculate the relative atomic mass of this sample of krypton. Give your answer to one decimal place. Explain why the value you have calcula
January 2012, CHEM1 (old spec), Q7(b) (5 marks): State how krypton is ionised in the mass spectrometer. Write an equation, including state symbols, to show the reaction that occurs when the first ionisation en
June 2011, CHEM1 (old spec), Q1(a)(i) (1 mark): In terms of fundamental particles, state the difference between isotopes of an element. (1 mark)
June 2011, CHEM1 (old spec), Q1(a)(ii) (1 mark): State why isotopes of an element have the same chemical properties. (1 mark)
June 2011, CHEM1 (old spec), Q1(c)(i) (3 marks): Calculate the relative atomic mass of element X. Give your answer to one decimal place.
June 2011, CHEM1 (old spec), Q1(c)(ii) (2 marks): Use the Periodic Table to identify the species responsible for the peak at m/z = 64 (2 marks)
June 2011, CHEM1 (old spec), Q1(e) (2 marks): Explain how the detector in a mass spectrometer enables the abundance of an isotope to be measured. (2 marks)
January 2011, CHEM1 (old spec), Q2(b)(i) (1 mark): State what is used to ionise a sample of indium in a mass spectrometer. (1 mark)
January 2011, CHEM1 (old spec), Q2(b)(ii) (1 mark): Write an equation, including state symbols, for the ionisation of indium that requires the minimum energy. (1 mark)
January 2011, CHEM1 (old spec), Q2(b)(iii) (1 mark): State why more than the minimum energy is not used to ionise the sample of indium. (1 mark)
January 2011, CHEM1 (old spec), Q2(b)(iv) (2 marks): Give two reasons why the sample of indium must be ionised. Reason 1 Reason 2 (2 marks)
January 2011, CHEM1 (old spec), Q2(c)(ii) (2 marks): Use these data to calculate the ratio of the relative abundances of the two isotopes. (2 marks)
January 2011, CHEM1 (old spec), Q2(d) (2 marks): State and explain the difference, if any, between the chemical properties of the isotopes 113In and 115In Difference in chemical properties Explanation (2 marks
June 2010, CHEM1 (old spec), Q8(a) (3 marks): Define the term mass number of an atom. The mass number of an isotope of nitrogen is 15. Deduce the number of each of the fundamental particles in an atom of 15
June 2010, CHEM1 (old spec), Q8(b) (4 marks): Define the term relative atomic mass. An organic fertiliser was analysed using a mass spectrometer. The spectrum showed that the nitrogen in the fertiliser was
June 2010, CHEM1 (old spec), Q8(d) (2 marks): Organic fertilisers contain a higher proportion of 15N atoms than are found in synthetic fertilisers. State and explain whether or not you would expect the chem
January 2010, CHEM1 (old spec), Q5(b) (3 marks): Element X has a relative atomic mass of 47.9 Identify the block in the Periodic Table to which element X belongs and give the electron configuration of an atom
January 2010, CHEM1 (old spec), Q5(c) (4 marks): The mass spectrum of element Z is shown below. Use this spectrum to calculate the relative atomic mass of Z, giving your answer to one decimal place. Identify e
January 2010, CHEM1 (old spec), Q5(e) (2 marks): Explain briefly how the relative abundance of an ion is measured in a mass spectrometer.
June 2009, CHEM1 (old spec), Q5(a)(ii) (4 marks): 5 (a) (ii) A sample of the metal silver has the relative atomic mass of 107.9 and exists as two isotopes. In this sample, 54.0% of the silver atoms are one isot
January 2009, CHEM1 (old spec), Q1(c)(i) (1 mark): 1 (c) (i) Deduce the number of protons in 182W (1 mark)
January 2009, CHEM1 (old spec), Q1(c)(ii) (1 mark): 1 (c) (ii) Deduce the number of neutrons in 186W (1 mark)
January 2009, CHEM1 (old spec), Q1(e) (2 marks): 1 (e) State and explain the difference, if any, between the chemical properties of the isotopes 182W and 186W Difference Explanation (2 marks)
January 2009, CHEM1 (old spec), Q1(f) (2 marks): 1 (f) The table below gives the relative abundance of each isotope in the mass spectrum of a sample of tungsten. m/z 182 183 184 186 Relative abundance / % 26.4
January 2009, CHM1 (2008 spec), Q1(a) (1 mark): 1 (a) Identify the part of the mass spectrometer labelled A in the diagram. (1 mark)
January 2009, CHM1 (2008 spec), Q1(d) (2 marks): 1 (d) The table below shows the relative abundance of each isotope in this sample of strontium. Use the data in the table to calculate the relative atomic mass
June 2008, CHM1 (2008 spec), Q1(a) (1 mark): 1 (a) State, in terms of protons and neutrons, the meaning of the term isotopes. (1 mark)
June 2008, CHM1 (2008 spec), Q1(b) (2 marks): 1 (b) The table below gives the relative abundance of each isotope in a mass spectrum of a sample of lead, Pb Use these data to calculate the relative atomic ma
June 2008, CHM1 (2008 spec), Q1(c) (3 marks): 1 (c) Lead is used in lead-acid car batteries. 1 (c) (i) Balance the equation, given below, for the overall reaction which occurs when a lead-acid battery produ
June 2008, CHM1 (2008 spec), Q1(d) (2 marks): 1 (d) An atom has four times the number of protons, and three times the number of neutrons, as there are in the 7Li atom. Deduce the symbol, including the mass

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