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Exercise 1 a) What does it mean that a solution is acid? b) What is the pH of the following 3 solutions at room temperature a. 0,02 M HCL b. 0,000000004 M HCL c. 0,005 M NaOH c) Write the electron structure for the following: Mg, Cl, Be2+ and S2- d) What type of molecular binding will normally exist between nonmetals like H and S and what is characteristics for this type of binding? Exercise 2 Ammonium is produced in the following equilibrium reactions, which is exothermic from left to right N2(g) + 3H2(g) ↔ 2NH3(g) + Q a) Explain by using LeChatelier’s principle in which direction the equilibrium is shifted if N2 is added to a closed system. b) Explain by using LeChatelier’s principle in which direction the equilibrium is shifted if heat is added to a closed system. c) Explain by using LeChatelier’s principle in which direction the equilibrium is shifted if the volume of the closed system is suddenly reduced Exercise 3 A small bobble is raising from the bottom of a lake. It is taken for granted that the bobble only contains methane gas. On the bottom on the lake the temperature is 9 degree C and the pressure is 5,4 *105 Pa (5,3 atm). By the water front level the temperature is 22 degree C and the pressure is 1,0 *105 Pa (1,0 atm). The bobble has a volume of 1,2 mL at the bottom of the lake. a) How many mol and molecules does the bobble contain? b) What is the formal concentration of Methane in the bobble at the bottom of the lake? c) Calculate the volume of the bobble at the water level just before the water bobble burst. d) Calculate the density of Methane (g/l) at the water level just before the water bobble burst Methane can be used as fuel in a controlled process with excess oxygen. e) Write a balanced reactions for the full combustion of Methane. Exercise 4 Production of synthetic polymer and comparison of synthetics polymers with the natural cotton fibers a) Explain the polymerization process for Polyethylene PP, the repeat unit and the functional units. What is the expected polarity b) Explain the buildup of cotton fiber and the relation to water absorption, strength and dye ability and wash fastness. c) Explain the basic of Viscose, there does it come from and what is the main properties of this fiber. d) Explain how the factor mention in the table 1 has a relation to strength of the cotton fiber compared to viscose Table 1 Exercise 5 Balanced the following equation 1) Ag (s) + NO3 -  Ag+ + NO2 (acid solution) 2) Cl- + Cr2O7 2-  Cl2 + Cr3+ (acid solution) 3) CH3CH2OH + MnO4 -  ? + Mn2+ (acid solution, full oxidation)

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Chemistry Questions - Equilibrium Reactions and Explanations
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