Chemical Change Assignment 1SECTION 1 (AC1.1 / AC1.2)You will need to answer each of the questions in this section. You must include yourfull workings of your answers within your submission.1. You have been given a sample of unknown molarity. Calculate the molarity ofa solution which has been prepared by dissolving 8.75 moles of sodiumchloride in enough water to produce a solution of 6.22l.2. You have a sample which consists of 428g sodium hydroxide (NaOH)dissolved in enough water to make a final solution of 6.4l. What is themolarity?3. You have been given a sample of 4.85 moles of glucose (C6H12O6) and youwant to make a 0.75M solution with it. What will be the final volume ofsolution?4. 37.0cm³ of a sodium hydroxide (NaOH) solution was pipetted into a conicalflask and titrated with a standard solution of 0.3 mol dm-3 hydrochloric acidaccording to the following equation:NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)A universal indicator solution was used for the titration and it was found that22.0 cm3 of the acid (HCl) was required to neutralise the alkali (NaOH).Calculate the molarity of the sodium hydroxide.SECTION 2 (AC2.1 / AC2.2)(A) Imagine you have been given a series of materials to react together and thefollowing enthalpy change data has been recorded. Explain the termsexothermic and endothermic, and identify which of the following areexothermic and endothermic reactions. Ensure that you explain yourreasoning. Your explanation should be a maximum of 500 words.1. N2 + 2O2 → 2NO2 ΔH = +68kJ mol–12. C3H8 + 5O2 → 3CO2 + 4H2O ΔH = -2220kJ mol–13. 2H2 + O2 → 2H2O ΔH = -486.3kJ mol–14. 2CO2 → 2CO + O2 ΔH = +566kJ mol–1(B) You have been asked to calculate the enthalpy change in the followingreaction: 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s)The reaction occurs in the following stages:Chemical Change Assignment 21. 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(l) ΔH = -732.5kJ mol–12. Al2O3(s) + 2Fe(l) → Al2O3(s) + 2Fe(s) ΔH = -27.6kJ mol–13. Al2O3(s) + 2Fe(l) → Al2O3(s) + 2Fe(s) ΔH = -91kJ mol–1Note stages 2 and 3 look the same, but the reaction is cooling from 1700oC to 25oCand hence the enthalpy change there. Calculate the overall enthalpy change for thereaction. You must show your workings within your submission, and explain yourreasoning. Your explanation should be a maximum of 300 words.SECTION 3 (AC3.1 / AC3.2)(A) After experimentation you have determined the following rate equations:1. Rate = k[H2] [NO]22. Rate = k[H2]2 [O2]3. Rate = k[H2] [NO]Identify the order of reaction for each of these rate equations. You must show yourworkings within your submission, and explain your reasoning. Your explanationshould be a maximum of 300 words.(B) Through experimentation, you note that at high temperatures ethyl chlorideproduces HCl and ethylene by the following reaction:CH3CH2Cl(g) → HCl(g) + C2H4(g)Using the rate data for the reaction at 650°C presented in the following table,calculate the reaction order with respect to the concentration of ethyl chloride(CH3CH2Cl). You must show your workings within your submission, and explain yourreasoning. Your explanation should be a maximum of 300 words. Experiment[CH3CH2Cl]ₒ (M)Initial Rate (M/s)10.0101.6 x 10-820.0152.4 x 10-830.0304.8 x 10-840.0406.4 x 10-8 Chemical Change Assignment 3SECTION 4 (AC4.1 / AC4.2)(A) For the following reactions, determine the equilibrium constant equation. Youmust show your workings within your submission.1) CO2(g) + H2(g) CO(g) + H2O(g)2) 2NO(g) + 2H2(g) N2(g) + 2H2O(g)3) Cu(s) + 2Ag+(g) Cu2+(g) + 2Ag(s)4) H2(g) + I2(g) 2HI(g)(B) Read the following relating to the Haber process:“The raw materials for this process are hydrogen and nitrogen. Hydrogen is obtainedby reacting natural gas – methane – with steam, or through the cracking of oil.Nitrogen is obtained by burning hydrogen in air. Air is 80% nitrogen; nearly all therest is oxygen. When hydrogen is burned in air, the oxygen combines with thehydrogen, leaving nitrogen behind. Nitrogen and hydrogen will react together underthese conditions:• A high temperature – about 450oC• A high pressure – about 200 atmospheres (200 times normal pressure)• An iron catalyst”The chemical reaction which occurs during the Haber process is:Nitrogen + Hydrogen AmmoniaN2(g) + 3H2(g) 2NH3(g)1. Explain Le Chatelier’s principle.2. Use Le Chatelier’s principle to explain what would happen if you raised thetemperature of this reaction.3. Use Le Chatelier’s principle to explain what would happen if you increased thepressure of this reaction.4. Use Le Chatelier’s principle to explain what would happen if you increased theconcentration of Nitrogen at the start of the reaction.Your response for this question should be a maximum of 500 words.
