Part A.Answer all eight questions(5 marks each). 1. Describe what happens in an electron capture process,and how it is observed An inner shell electron is captured by the nucleus,where it combines with a proton to form a neutron.It is observed by the gamma radiation which is emitted immediately after the capture process. Indicate whether each of the following processes have positive or negative values of AH and AS: △(Indicate+or-)△S(Indicate+or-） H0g→Hg+⅓02g 2C102am+02g→2C103(am C8H18g+12.502g→8C02g+9 H2Og) Cooling H2(0 from200℃to150 SF6→SF6g Which has a smaller radius:a Kr atom or a Sr2ion?Why? The Srion has a smaller radius.Although the Kr atom and Srion are isoelectronic.the Sr ion has two more protons,making its effective nuclear charge greater,hence its radius smaller. Name the strongest intermolecular force in each of the following pairs of species Species Strongest Intermolecular Force Two CH4molecules Dispersion(London) Part A. Answer all eight questions (5 marks each). 1. Describe what happens in an electron capture process, and how it is observed. An inner shell electron is captured by the nucleus, where it combines with a proton to form a neutron. It is observed by the gamma radiation which is emitted immediately after the capture process. 2. Indicate whether each of the following processes have positive or negative values of ΔH and ΔS: ΔH (Indicate + or -) ΔS (Indicate + or -) H2O(g) → H2(g) + ½ O2(g) + + 2 ClO2 – (aq) + O2(g) → 2 ClO3 – (aq) - - C8H18(g) + 12.5 O2(g) → 8 CO2(g) + 9 H2O(g) - + Cooling H2O(g) from 200o C to 150o C - - SF6(s) → SF6(g) + + 3. Which has a smaller radius: a Kr atom or a Sr+2 ion? Why? The Sr+2 ion has a smaller radius. Although the Kr atom and Sr+2 ion are isoelectronic, the Sr+2 ion has two more protons, making its effective nuclear charge greater, hence its radius smaller. 4. Name the strongest intermolecular force in each of the following pairs of species: Species Strongest Intermolecular Force Two CH4 molecules Dispersion (London)