Activity 1 Reactions in Aqueous Solution Question
1 a) For the following reaction,
identify the reactant that is an acid, the reactant that is a base and the two conjugate acid-base pairs present? OH− (aq) + HNO2(aq) ⇌ H2O(l) + NO2 − (aq)
b) For the following solution; what is the hydroxide ion concentration? Is this solution acidic, basic or neutral? Vinegar has a pOH of 11.3
c) Assign oxidation numbers to all the atoms in the following reaction and identify whether the reaction is a redox reaction. Explain your conclusion? CH4 (g) + O2(g) → 2H2O(l) + CO2(g)
Activity 2 Bonding and Gases Question
1 a) Some triatomic molecules are linear, whilst some are bent. Explain using lewis structures and VSPER theory whether CO2 and SO2 are linear or bent.
b) Mixtures of helium and oxygen are used in scuba diving tanks to help prevent ‘the bends’, a condition caused by nitrogen bubbles forming in the bloodstream. If 76 L of oxygen and 20.0 L of helium at STP (273.15 K and 1.00 bar) are pumped into a scuba tank with a volume of 6.4 L, what is the partial pressure of each gas in the tank and what is the total pressure in the tank at 25 oC 1 bar = 105 Pa and 1 m3 = 1 x 103 L R = 8.314 J mol−1 K−1
Activity 3 Equilibrium and Acid/Base Applications Question
1 a) According to Le Châtelier’s Principle, for an endothermic reaction at equilibrium, what will happen if a reaction product is removed?
b) At a high temperature, 1.75 mol of HBr was placed in a 3.50 L container where it decomposed according to the equation below. At equilibrium, the concentration of Br2 was measured to be 0.0735 M. What is the K for this reaction at this temperature? 2HBr(g) ⇌ H2(g) + Br2(g)
c) Calculate the pH of a 1.4 L aqueous solution made from 0.30 mol CH3COOH and 0.60 mol KCH3COO (Ka = 1.8 x 10−5 )