1 Atomic structure and isotopes

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Oxford Textbook Pages : 8 - 11

CGP Revision Guide Pages : 14 - 17

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Show Specification Ref : 2.1.1a, 2.1.1b

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Question 1 / 5

January 2010 QP – Unit 1 AQA Chemistry A-level_question_5 section b answer all questions in the spaces provided pmt areas outside the box will not be scanned for marking a mass spectrometer can be used to investigate the isotopes in an element a define the term relative atomic mass of an element marks extra space b element x has a relative atomic mass of identify the block in the periodic table to which element x belongs and give the electron configuration of an atom of element x calculate the number of neutrons in the isotope of x which has a mass number marks extra space question continues on the next page turn over wmp jan chem pmt areas outside the box will not be scanned for marking c 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 element z relative abundance m z marks extra space wmp jan chem pmt areas outside the box will not be scanned for marking d state how vaporised atoms of z are converted into z ions in a mass spectrometer state and explain which of the z ions formed from the isotopes of z in part c will be deflected the most in a mass spectrometer marks extra space e explain briefly how the relative abundance of an ion is measured in a mass spectrometer marks extra space turn over wmp jan chem
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Question 2 / 5

June 2010 QP – Unit 1 AQA Chemistry A-level_question_8 a define the term mass number of an atom do not write outside the box the mass number of an isotope of nitrogen is deduce the number of each of the fundamental particles in an atom of n marks extra space wmp jun chem b define the term relative atomic mass do not write outside the box an organic fertiliser was analysed using a mass spectrometer the spectrum showed that the nitrogen in the fertiliser was made up of n and n calculate the relative atomic mass of the nitrogen found in this organic fertiliser give your answer to two decimal places marks extra space c in a mass spectrometer under the same conditions n and n ions follow different paths state the property of these ions that causes them to follow different paths state one change in the operation of the mass spectrometer that will change the path of an ion marks question continues on the next page turn over wmp jun chem do not write outside the box d organic fertilisers contain a higher proportion of n atoms than are found in synthetic fertilisers state and explain whether or not you would expect the chemical reactions of the nitrogen compounds in the synthetic fertiliser to be different from those in the organic fertiliser assume that the nitrogen compounds in each fertiliser are the same marks end of questions copyright aqa and its licensors all rights reserved wmp jun chem
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Question 3 / 5

June 2011 QP – Unit 1 AQA Chemistry A-level_question_1 section a answer all questions in the spaces provided do not write outside the box mass spectrometry can be used to identify isotopes of elements a i in terms of fundamental particles state the difference between isotopes of an element mark a ii state why isotopes of an element have the same chemical properties mark b give the meaning of the term relative atomic mass marks extra space wmp jun chem do not write outside the box c the mass spectrum of element x has four peaks the table below gives the relative abundance of each isotope in a sample of element x m z relative abundance c i calculate the relative atomic mass of element x give your answer to one decimal place marks c ii use the periodic table to identify the species responsible for the peak at m z marks d suggest one reason why particles with the same mass and velocity can be deflected by different amounts in the same magnetic field mark e explain how the detector in a mass spectrometer enables the abundance of an isotope to be measured marks extra space turn over wmp jun chem do not write outside the box norgessaltpeter was the first nitrogen fertiliser to be manufactured in norway it has the formula ca no a norgessaltpeter can be made by the reaction of calcium carbonate with dilute nitric acid as shown by the following equation caco s hno aq ca no aq co g h o i in an experiment an excess of powdered calcium carbonate was added to cm of mol dm nitric acid a i calculate the amount in moles of hno in cm of mol dm nitric acid give your answer to significant figures mark a ii calculate the amount in moles of caco that reacted with the nitric acid give your answer to significant figures mark a iii calculate the minimum mass of powdered caco that should be added to react with all of the nitric acid give your answer to significant figures marks a iv state the type of reaction that occurs when calcium carbonate reacts with nitric acid mark wmp jun chem
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Question 4 / 5

June 2013 QP – Unit 1 AQA Chemistry A-level_question_1 section a answer all questions in the spaces provided do not write outside the box the mass spectrum of the isotopes of element x is shown in the diagram relative abundance m z a define the term relative atomic mass marks b use data from the diagram to calculate the relative atomic mass of x give your answer to one decimal place marks wmp jun chem do not write outside the box c identify the ion responsible for the peak at mark d identify which one of the isotopes of x is deflected the most in the magnetic field of a mass spectrometer give a reason for your answer isotope reason marks e 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 current is generated marks f x and zn are different elements explain why the chemical properties of x and zn are different mark turn over wmp jun chem do not write outside the box a the hydrocarbon but ene c h is a member of the homologous series of alkenes but ene has structural isomers a i state the meaning of the term structural isomers marks a ii give the iupac name of the position isomer of but ene mark a iii give the iupac name of the chain isomer of but ene mark a iv draw the displayed formula of a functional group isomer of but ene mark wmp jun chem
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Question 5 / 5

June 2015 QP – Unit 1 AQA Chemistry A-level_question_2 do not write outside the box a tellurium is the element with atomic number of using information from the periodic table complete the electron configuration of tellurium mark kr b the mass spectrum of a sample of tellurium is shown in figure figure relative abundance m z ratio b i use figure to calculate the relative atomic mass of this sample of tellurium give your answer to one decimal place marks b ii suggest what might cause the relative atomic mass of this sample to be different from the relative atomic mass given in the periodic table mark wmp jun chem do not write outside the box c write an equation for the reaction that occurs when a tellurium ion hits the detector mark d state the m z value of the ions that produce the biggest current at the detector when the spectrum in figure is recorded give a reason for your answer marks m z value reason e the mass spectrum of tellurium also has a small peak at m z explain the existence of this peak marks f predict whether the atomic radius of te is larger than smaller than or the same as the atomic radius of te explain your answer marks atomic radius of te compared to te explanation turn over wmp jun chem
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