Module 3 Summative Assessment

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Chemistry 30 Unit B Module 3 Summative Assessment Page 1 of 13 Module 3 Summative Assessment 1. Write balanced reaction equations, including states, for the following processes. Identify each process as exothermic or endothermic. Answer (6 Marks) Process Reaction Equation Photosynthesis 6 CO2 + 6 H2O + energy -> C6H12O6 + 6 O2 Cellular respiration C6H12O6 + 6 O2 -> 6 CO2 + 6 H2O + energy Complete hydrocarbon combustion of octane in an open system CnHn + O2 -> CO2 + H2O + energy Process Exothermic/Endothermic Photosynthesis Endothermic Cellular respiration Exothermic Complete hydrocarbon combustion Exothermic Lesson 1 2. Enthalpy cannot be directly measured but change in enthalpy can be measured. When measuring the change in enthalpy of a chemical system, which 2 variables must be held constant? As a result, what does the enthalpy change of a chemical system represent? Answer (2 Marks) Marks Maximum Possible Earned % 65
Chemistry 30 Unit B Module 3 Summative Assessment Page 2 of 13 The 2 variables that must be held constant when measuring enthalpy change are temperature and pressure. As a result, the enthalpy change of a chemical system represents the potential energy change of the system. Lesson 2 3. Define activation energy. Sketch a diagram that illustrates the concept of activation energy using the concept of bond energy . Answer (3 Marks) Activation is the minimum amount of energy needed for a reaction to occur. O + O + energy -> O2 Energy Energy needed for bonds to be formed Use the following information to answer the next two questions. When solid potassium is placed in a beaker of water at room temperature, an immediate, violent reaction occurs: 2 2 2 K(s) + 2 H O(l) 2 KOH(aq) + H (g) + energy → 4. Sketch and label an energy pathway diagram for this reaction. Your diagram should include: • labelling of the X and Y axes • general shape of the energy pathway
Chemistry 30 Unit B Module 3 Summative Assessment Page 3 of 13 • labeling of the reactant plateau, the product plateau, the activation energy (Ea) and the change in enthalpy (Δ r H) No specific numerical values are required. Answer (4 Marks) E a 2 K(s)+2 H2O(l) E p (kJ) Δ r H 2 KOH(aq) + H2(g) + energy Reaction progression 2 K(s) + 2 H2O(l) -> 2 KOH (aq) + H2 (g) + energy 5. Refer to the diagram you drew in Question 4. When solid potassium is placed in a beaker of water at room temperature, what should happen to the temperature of the water? Answer (1 Mark) The water should heat up because the potassium would meet the water and the thermal energy in the water would act as the activation energy, turning the K into KOH, releasing energy into the water.
Chemistry 30 Unit B Module 3 Summative Assessment Page 4 of 13 View the “Catalyst Virtual Investigation” in Module 3 Lesson 2.3 Use the information in the Virtual Investigation to answer Questions 6-14. 6. Research! What are the safety concerns surrounding experiments using hydrogen peroxide? Include the WHMIS symbol(s) that should be displayed on a container of hydrogen peroxide. (Remember to use 2015 WHIMIS symbols) Answer (3 Marks) Safety concerns surrounding experiments using hydrogen peroxide are corrosion and oxidization. Hydrogen peroxide can cause irritation to skin and eyes if it comes in contact with it. Additionally, hydrogen peroxide is a very strong oxidizer, meaning it can intensify fires it comes in contact with. 7. T he “sizzling” sound in this experiment (amplified by the microphone) is caused by _____________________? Answer (1 Mark) The sizzling is caused by the hydrogen peroxide breaking into oxygen gas and water. The oxygen bubbles are what causes the sizzling sound. 8. Identify the liver enzyme that catalyzed the decomposition of hydrogen peroxide. Answer (1 Mark) Catalase is the enzyme that catalyzed the decomposition of hydrogen peroxide.
Chemistry 30 Unit B Module 3 Summative Assessment Page 5 of 13 9. Regarding the Catalyst Virtual Investigation, identify the following variables. Hint: Manipulated variables are conditions that are deliberately changed by the experimenter. Responding variables are conditions that change in response to the change in the manipulated variables. Controlled variables are conditions that could have changed but did not because of the intervention of the experimenter. Answer (4 Marks) Manipulated Variable The type of catalyzer used (yeast, liver, manganese dioxide). Responding Variable Speed of H2O2 decomposition. Controlled Variables (Identify two (2)) Pressure of the experiment. Type of solvent used (H2O2) 10. Design a data chart to collect and record data while watching the Catalyst Virtual Investigation. In your chart, list every catalyst used and describe the effect of the catalyst on the relative reaction rate. To gauge the speed of the reaction, use the amount of bubbling (as evidenced by the sound). Answer (3 Marks) Catalyst used Relative reaction rate No catalyst No evidence of decomposition Manganese dioxide High decomposition rate. Yeast Low decomposition rate. Liver Medium decomposition rate. 11. Refer again to the Catalyst Virtual Investigation. For the following system, record the initial and final temperatures. Answer (2 Marks) System Initial temperature ( o C) Final temperature ( o C)
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