1.5 Noem die tipe intermolekulêre krag wat die volgende situasie beskryf: Die intermolekulêre krag tussen ‘n ioon en ‘n nie-polêre molekule, wat lei tot ‘n swak, kortstondige krag wat die verbindings bymekaar hou. (2)

1.4 Activation energy can best be described as the minimum energy required for ______. (2)

QUESTION 5 The graph below shows the energy changes during the course of a chemical reaction.   Right click on the following blue button to open ALL THE IMAGES for QUESTION 5, in a new tab.   5.1 Define ‘activation energy’. (2) 5.2 Does the graph represent an endothermic or exothermic reaction? Motivate your answer. (2) 5.3 Write down the activation energy for the reverse reaction in kJ.mol-1 (2) 5.4 A suitable catalyst was obtained for this reaction. Redraw the given graph and clearly indicate what the effect of the catalyst will be on the activation energy. (2) 5.5 How will the addition of a catalyst affect the ΔH? (2) 5.6 The following curves suggest different factors that can influence the rate of a chemical reaction.   Please refer to Diagram 2, Question 5 to answer the following questions.   5.6.1 Which line X, Y or Z, represents an increase in the concentration of the reactants? (2) 5.6.2 Use the collision theory to explain how the increase in concentration will affect the reaction rate. (3) 5.7 A study was done to find out the effect of the concentration of a reactant on the total time it takes to complete a chemical reaction. Four attempts of the same reaction are performed. In each attempt, the initial concentration of the reactant was different. The time required to complete the reaction is measured each time. The data for each of the four attempts are shown in the table below.   Please refer to Diagram 3, Question 5 to answer the following questions.   5.7.1 Provide an investigative question for this experiment. (2) 5.7.2 Identify the dependent variable. (1) 5.7.3 Use the results in the table and draw a graph. (4) 5.7.4 Use your graph and calculate the average reaction rate for the first 40 s. (4) 5.7.5 Write a conclusion for this experiment. (2)     [28]

1.4 Kies die regte term om die volgende sin te voltooi; In ‘n nie-polêre molekule word die lading ________ oor die molekule versprei (2)

NB !!! VERY IMPORTANT EXAM INFORMATION   If you have answered all your questions or the time has elapsed, please click on the “Submit Quiz” button below.   Please then move on to the PHSC GR11E SBA 004b JUNE EXAMINATION PAPER 2 (PDF DOWNLOAD) QUIZ, by clicking on the “NEXT” button.   Please upload your SINGLE PDF document in this “Quiz”.   You will be given 30 minutes for the upload.   Please remember to name your PDF document correctly: NAME_SURNAME_PHSC_GR11E_SBA004b

1.7 Van wat is die volgende ‘n definisie: ‘n Maatstaf van die aantal botsings van die gasdeeltjies met mekaar en met die sykante van die houer waarin hulle is. (2)

Right click on the button below to open the Information Sheet in a new tab. SECTION A: MULTIPLE CHOICE QUESTIONS Four possible options are provided as answers to the following questions. Each question has only ONE correct answer. Click on the button next to the correct answer.

NB!!! BAIE BELANGRIKE EKSAMEN INLIGTING   Indien jy jou vraestel klaar beantwoord het of die tyd versteke is, klik asseblief op die “Submit Quiz”-knoppie hieronder.   Beweeg asseblief daarna na die PHSC GR11A SBA 004b JUNIE EKSAMEN VRAESTEL 2 (PDF OPLAAI) QUIZ, deur op die “NEXT” knoppie te klik.    Laai asseblief jou ENKELE PDF dokument in hierdie “Quiz”op.   Jy sal 30 minute daarvoor gegun word.   Onthou asseblief om jou PDF dokument korrek te benoem: NAAM_VAN_PHSC_GR11A_SBA004b

VRAAG 5 5.1 Jy besluit om ‘n titreringseksperiment uit te voer om die konsentrasie van ‘n monster kaliumhidroksied te bepaal.  Gegee die volgende gebalanseerde vergelyking: KOH(aq) + HCl(aq)

QUESTION 6 0,5mol H2(g) and 0,6mol Br2(g)  is combined in a 5.0dm3 flask and heated to 700 K. The reaction is exothermic : H2(g) + Br2(g) → 2HBr(g) 6.1 The concentration of HBr in the flask at equilibrium is 0.17 mol.dm-3. Calculate  Kc. (8) 6.2 When the temperature is increased, will the Kc value INCREASE, DECREASE or STAY THE SAME? Use Le Chatelier’s principle to explain your answer. (4) 6.3 Consider the following graph and answer the questions that follow:   Right click on the following blue button to open the images for QUESTION 6, in a new tab.       6.3.1 Write a balanced equation that represents the exothermic reaction that takes place. (3) 6.3.2 Give the time (s) when the system reaches equilibrium. (2) 6.3.3 Name the disturbance that occurred at 14 s. (2) 6.3.4 How will the value of the equilibrium constant after this disturbance change? Write only INCREASE, DECREASE or STAY THE SAME. Give a reason for your answer. (3) 6.3.5 Name the conditions necessary for the reaction to reach equilibrium. (2) 6.3.6 Name one other condition that will affect the equilibrium in this reaction and explain what the effect will be on the Kc-value if this condition increases.  (3)     [27]