1 Subatomic Particles and Isotopes

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Oxford Textbook Pages : 4 - 7

CGP Revision Guide Pages : 2 - 3

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Show Specification Ref : 3.1.1.1, 3.1.1.2

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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 2014 QP – Unit 1 AQA Chemistry A-level_question_1 section a answer all questions in the spaces provided do not write outside the box a table shows some data about fundamental particles in an atom table particle proton neutron electron mass g a i an atom of hydrogen can be represented as h use data from table to calculate the mass of this hydrogen atom mark a ii which one of the following is a fundamental particle that would not be deflected by an electric field a electron b neutron c proton write the correct letter a b or c in the box mark wmp jun chem do not write outside the box b a naturally occurring sample of the element boron has a relative atomic mass of in this sample boron exists as two isotopes b and b b i calculate the percentage abundance of b in this naturally occurring sample of boron marks b ii state in terms of fundamental particles why the isotopes b and b have similar chemical reactions mark c complete table by suggesting a value for the third ionisation energy of boron mark table first second third fourth fifth ionisation energy kj mol d write an equation to show the process that occurs when the second ionisation energy of boron is measured include state symbols in your equation mark e explain why the second ionisation energy of boron is higher than the first ionisation energy of boron mark turn over wmp jun chem do not write outside the box when heated iron iii nitrate mr is converted into iron iii oxide nitrogen dioxide and oxygen fe no s fe o s no g o g a g sample of iron iii nitrate was completely converted into the products shown a i calculate the amount in moles of iron iii nitrate in the g sample give your answer to significant figures mark a ii calculate the amount in moles of oxygen gas produced in this reaction mark a iii calculate the volume in m of nitrogen dioxide gas at c and kpa produced from g of iron iii nitrate the gas constant is r j k mol if you have been unable to obtain an answer to question a i you may assume the number of moles of iron iii nitrate is this is not the correct answer marks wmp jun chem
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Question 5 / 5

January 2010 QP – Unit 5 AQA Chemistry A-level_question_4 the table below gives some values of standard enthalpy changes use these values to answer the questions areas outside the box will not be scanned for marking name of enthalpy change h kj mol enthalpy of atomisation of chlorine electron affinity of chlorine enthalpy of atomisation of silver first ionisation enthalpy of silver enthalpy of formation of silver chloride a calculate the bond enthalpy of a cl cl bond mark b explain why the bond enthalpy of a cl cl bond is greater than that of a br br bond marks c suggest why the electron affinity of chlorine is an exothermic change mark wmp jan chem d the diagram below is an incomplete born haber cycle for the formation of silver chloride the diagram is not to scale areas outside the box will not be scanned for marking ag g cl g ag s cl g agcl s d i complete the diagram by writing the appropriate chemical symbols with state symbols on each of the three blank lines marks d ii calculate a value for the enthalpy of lattice dissociation for silver chloride marks question continues on the next page turn over wmp jan chem areas outside the box will not be scanned for marking e the enthalpy of lattice dissociation for silver chloride can also be calculated theoretically assuming a perfect ionic model e i explain the meaning of the term perfect ionic model mark e ii state whether you would expect the value of the theoretical enthalpy of lattice dissociation for silver chloride to be greater than equal to or less than that for silver bromide explain your answer theoretical lattice enthalpy for silver chloride explanation marks extra space e iii suggest why your answer to part d ii is greater than the theoretical value for the enthalpy of lattice dissociation for silver chloride marks wmp jan chem there are no questions printed on this page do not write on this page answer in the spaces provided turn over wmp jan chem
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