CHM exp report 3 - CHM 151 Experiment Report Student's name...

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CHM 151 Experiment Report Student’s name : Lai Shin Zie ID : I08001607 Partner’s name : Nicholas Chai ID : I08001107 Section : 5A Lecturer’s name : Dr. Palsan A/L Sannasi @ Sannach Due date : 06 June 2008
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30 May 2008 Experiment 3 : Periodic Table and Periodic Law Aim : 1. To determine the periodic trends of elements in the periodic table. 2. To determine the relative chemical reactivity of chlorine, bromine and iodine. 3. To determine the chemical properties of halides. 4. To determine the relative solubility of the hydroxides of magnesium and calcium. 5. To determine the chemical properties between sulfurous acid and sulfuric acid. 6. To determine the chemical properties of sodium. Procedure : Please refer to the laboratory manual page 23-30. Results : A. Periodic Trends in Physical Properties. 1a) The ionization energies are decreasing “down” the group. b) The ionization energies are decreasing “down” the group. c) The ionization energies are increasing across the period. 2a) Group 1. b) The atomic radii are increasing. c) The ionization energy is inversely proportional to the atomic radii. 3a) The halogens. b) No. According to the graph the electron affinities for elements in period 2 are slightly lower than the electron affinities for elements in period 3 although they same similar trends. c) Yes, they are in inverse proportional. When the atomic radii of an element increases, the electron affinities of the element decreases.
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4a) The melting point will increase from the first solid state element across the period until the first gases or liquid state element then the melting point will decrease. b) Carbon. No, it does not have high melting points. c) Increase at first then slightly decrease after that it increase again then lastly it decrease. 5a) Caesium.
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CHM exp report 3 - CHM 151 Experiment Report Student's name...

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