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Module 1: Lesson 2 ASSIGNMENT Total /15 Read all parts of your assignment carefully, and record your answers in the appropriate places. If you have difficulty with an assignment, go back to the textbook and review the appropriate lesson. Be sure to proofread your answers carefully before submitting your Assignment. Lesson 2 Assignment: How Much Energy? Part 1—Lesson 2 Lab: Calorimetry 1. Use the multimedia presentation for this lab to complete the following table (4 marks) : mass of nut (g) mass of water (g) initial temperature of water (C) final temperature of water (C) For here, make sure you are accessing the lab data given in Module 1 Lesson Notes Lesson 2 Lab Your measurements should all have a decimal point. If you’re not sure why, check the review on Significant Figures and Measurements lesson on Moodle. 2. The following questions appear on page 479 of the textbook. Calculate how much energy was absorbed by the water (3 marks). [~ 8.00 x103 J or 8.00 kJ] Answer: We’re using Q = mc?T here. Make sure to show all your work (See GRASP Method lesson for this). Check your final answer’s significant figures. You might not get the same answer as the recommended answer it red, that’s why there is the ~ symbol. It is a tilde, but can be read as “approximately” Where did the nut’s energy come from (Hint: The thermal energy gained by the surroundings in this experiment comes from where originally – think specifically from a biology perspective) (2 marks) Answer: Follow the energy changes all the back to the ultimate source of energy in our solar system. Types of energy include but are not limited to: Chemical energy Mechanical energy Nuclear energy Gravitational energy Radiant energy Thermal energy Motion energy Sound Electrical energy Calculate the quantity of energy produced per gram of fuel (nut) burned (2 marks). [~ 5.30 kJ/g] Answer: This is our energy value from (a) divided by the mass we burned. Compare this combustion reaction to the reaction that would happen if you were to eat the nut instead of burning it. (Hint: Again this question is going to require you to think from a Biology perspective). (2 marks) Answer: Compare cellular respiration with the combustion of glucose. See if you can find the energy values for these as well. This experiment uses low-tech equipment. How can you improve on the technology and, therefore, improve on the certainty of the experimental results (2 marks) ? Answer: Improving the results does not come from more precise tools of measuring like digital thermometers, but instead come from reducing the amount of energy lost. There is a specific device we can use instead of the low-tech calorimeter (it’s another type of calorimeter), or you can list ways to improve the calorimeter to isolate the system more. Submit your completed Assignment to Moodle at the end of this lesson.
