Chemistry 30s Exam Grade 11

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GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key IInstructions The final examination will be weighted as follows Modules 1–3 Modules 4–6 The format of the examination will be as follows: Part A: Fill-in-the-Blanks Part B: Multiple Choice Part C: Short Answer Total Marks Include units with all answers as required. Useful Information You will need the following in order to complete this examination: n n n n 15–20% 80–85% 22 x 1 = 22 marks 46 x 1 = 46 marks 32 marks 100 marks writing utensils and eraser or correction fluid some scrap paper a ruler a scientific calculator You will have a maximum of 2.5 hours to complete your final exam. Final Practice…show more content…
DO NOT circle your answers directly on the exam. Stoichiometry (6 marks) 1. Which of these interpretations of the following balanced equation is TRUE? 2S(s) + 3O2(g) → 2SO3(g) a) 2 atoms of S and 3 atoms of O2 form 2 atoms of SO3 b) 2 grams of S and 3 grams of O2 form 2 grams of SO3 c) 2 moles of S and 3 moles of O2 form 2 moles of SO3 d) 2 L of S and 3 L of O2 form 2 L of SO3 2. Which type of stoichiometric calculation does not involve the gram formula mass? a) Mass-mass problems b) Mass-particle problems c) Mass-volume problems d) Volume-volume problems 3. The ratio of the actual yield to the theoretical yield is known as the a) Excess yield b) Reagent yield c) Percent yield d) Experimental yield 4. In the following balanced equation, how many moles of aluminum are needed to form 3.70 moles of aluminum oxide, Al2O3? 4Al(s) + O2(g) → 2Al2O3(s) a) 7.40 moles b) 3.70 moles c) 2.00 moles d) 1.85 moles Final Practice Examination Answer Key 7 5. Convert 35.0 L of nitrogen gas to moles of nitrogen gas at STP. a) 1.56 moles b) 0.640 moles c) 7.84 moles d) 22.4 moles 6. Which of the following quantities is conserved in every chemical reaction? a) Molecules b) Mass c) Formula units d) Moles Solutions (20 marks) 7. Which of the following is LESS soluble in hot water than in cold water? a) CO2 b) NaCl c) NaNO3 d) KBr 8. What can be done to crystallize a supersaturated solution? a) Heat the solution. b) It will crystallize

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