Chemistry Part 1 : Download a Specification AS and A level combined specification http://filestore.aqa.org.uk/resources/chemistry/specifications/AQA-7404-7405-SP-2015-V1-1.PDF Part 2 :  Making Notes 3.1.1.1 Fundamental particles (specification points) Appreciate that knowledge and understanding of atomic structure has evolved over time. Protons, neutrons and electrons: relative charge and relative mass. An atom consists of a nucleus containing protons and neutrons surrounded by electrons. 3.1.1.2 Mass number and isotopes (specification point) The principles of a simple time of flight (TOF) mass spectrometer, limited to ionisation, acceleration to give all ions constant kinetic energy, ion drift, ion detection, data analysis. Using the specification points above write a summary of the key developments in atom structure from the ancient Greeks to the current taught model, including key experiments and diagrams. (not electron arrangement) Explain the principles of a simple time of flight (TOF) mass spectrometer, limited to ionisation, acceleration to give all ions constant kinetic energy, ion drift, ion detection, data analysis.  Part 3 : Exam Style Questions Q1.(a)    Describe how ions are formed in a time of flight (TOF) mass spectrometer. ...................................................................................................................................................................... ....................................................................................................................................................................... ........................................................................................................................ ……………………………………….(2)  (b)     A TOF mass spectrometer can be used to determine the relative molecular mass of molecular substances. Explain why it is necessary to ionise molecules when measuring their mass in a TOF mass spectrometer. ........................................................................................................................................................................ ........................................................................................................................ ………………………………………..(2) (Total 4 marks)

Chemistry (ii) Which one of the following is a fundamental particle that would not be deflected by an electric field? Circle correct answer. A electron B neutron C proton (1) (ii) State, in terms of fundamental particles, why the isotopes 10B and 11B have similar chemical reactions. ............................................................................................................................................................... ...............................................................................................................................................................(1) (Total 3 marks) Q2.Which of these atoms has the smallest number of neutrons?     A 3H B 4He C 5He D 4Li Q3.(a)    Table 1 shows some data about fundamental particles in an atom. (i)      An atom of hydrogen can be represented as 1H Use data from Table 1 to calculate the mass of this hydrogen atom. ............................................................................................................... (1)   Table 1 Particle proton neutron electron Mass / g 1.6725 × 10–24 1.6748 × 10–24 0.0009 × 10–24 (Total 1 mark) Q4.          (a)     Complete the following table. (2)   Relative mass Relative charge Proton Electron

Chemistry (b)     An atom of element Q contains the same number of neutrons as are found in an atom of 27Al. An atom of Q also contains 14 protons. (i)      Give the number of protons in an atom of 27Al. ............................................................................................................. (ii)     Deduce the symbol, including mass number and atomic number, for this atom of element Q. .............................................................................................................(3) (c)     Define the term relative atomic mass of an element. ...................................................................................................................... (2) (Total 7 marks)