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PART B      [4 marks]         [6 marks] UNIT 1

: Short Answers & Calculations (45 marks)



1.      Write the electron configurations for each element:


a) Sr                                                          




b) S-2




2.      Use VSEPR Theory to draw the 3D geometric structure of each molecule and provide the name of the resulting shape.



a) BrI5                                                                      b) IF3

















[4 marks]






















[6 marks]

3.      Draw the structure for the following organic molecules:


a) 1-chloro-3-ethylcyclohexene                                         b) 2-bromopentanal









c) 2,4-dimethylpentan-2-ol                                                d) 1-chloropentan-3-one











4.      Write the complete structural formula equation for each of the reactions below. Write the IUPAC name for each product.



a)      Addition Reaction (Hydration):  addition of water to pent-2-ene










b)     Esterification Reaction:  propan-1-ol and butanoic acid











[5 marks]

5. Use Hess's Law to calculate the heat of formation of C2H4 from the following data.

    Target Equation:  C(s) + H2(g) → C2H4(g)

    C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(l)       ∆H = -1410 kJ/mol

    C(s) + O2(g) → CO2(g)                                 ∆H = -393 kJ/mol

    H2(g) + 1/2 O2(g) → H2O(l)                        ∆H = -286 kJ/mol

[4 marks]

6.      Calculate the mass of carbon in C(s) + O2(g) → CO2(g) that would have to be burned to heat 30.0 mL of water from 20.0 °C to 65.0 °C. The ∆H for this reaction is -393 kJ/mol (Specific heat capacity of water is 4.18 J/g°C)











[5 marks]

7.      Consider the following reaction which has a K = 0.50




    SO3(g) + NO(g) → NO2(g) + SO2(g)




    If 0.60 mol of SO3 and 0.60 mol of NO were placed in a 3.0 L container and 

    allowed to react, what would be the equilibrium concentration of each gas?















[4 marks]










[3 marks]













[4 marks]

8.      Calculate the pH, pOH, [H+1], [OH-1] of a 0.02 mol/L NaOH solution.












9.      Determine the oxidation number of the underlined element in the compounds below. Show your work.            

(a)   HClO3                               (b) KNO2                                 (c) SO4-2

10.  Use oxidation numbers to determine whether the following are redox reactions or not.

(a)      CaCO3                →                CaO                +                CO2

(b)      SO3                +                H2O                →                H2SO4



Step-by-step answer

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Subject: Chemistry, Science

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