Final Examination Exercise of Chemistry - IPSE FPMIPA Universitas Pendidikan Indonesia

Final Examination Exercise 

1. Decide whether or not the following reaction are oxidation-reduction reaction. If so, identify the oxidizing agent and the reducing agent. 

a. FeS(aq) + HCl(aq) →FeCl2 + H2S b. Sn2+(aq) + IO4-(aq) → Sn4+(aq) + I3-(aq) 

2. Draw Lewis structure and determine the formal charge ofelement that has BOLD sign. (a) H3PO4 (b) SO42-

3. Please draw the Lewis electron dot structure and predict the molecular geometry of the
following: 

(a) SCl4 

(b) XeF4 

(c) PCl3 

4. Choose the stronger acid:

a. HClO2 or HClO3 

b. HBr or HCl 

5. Identify the conjugate acid-base pairs in the following reactions: 

a. HNO3 + N2H4 → NO3- + N2H5+ 

b. H2PO4- + CO32- → HPO42- + HCO32- 

6. A sodium hydroxide solution is prepared by dissolving 5,0 g of NaOH in 1 L of solution. What is the molar concentration of OH- in the solution? What are the pOH and the pH of the solution? What is the hydrogen ion concentration in the solution? 

7. A solution of acetic acid has the pH of 2,95. What is the concentration of acetic acid in the solution. Write the chemical equations for the ionization of acetic acid in water and draw the sub microscopic level of aqueous solution of acetic acid. 

8. Predict whether this following solution acidic, basic or neutral. Give your reason. 

a. K2SO4(aq) 

b. N2H5Cl(aq) 

c. NH4NO3(aq) 

d. NaF(aq) 

9. 100 mL of 0,3 M solution of ammonia is mixed with 100 ml of 0,3 M solution of hydrochloric acid. What is the pH of the resulting solution? (Kb = 1,8 x 10-5).

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