Rate+of+Heating

Students will make a graph showing the amount of heat added by a candle and Bunsen burner to 100 mL of water during every minute of heating. The independent variable in the graph is time. The dependent variable is heat, in Joules. Each student will then upload his or her graph to this page as a jpeg or gif image. Please be careful not to delete these instructions while uploading your graph.

Students must first analyze the data from their experiment. Two trials were conducted, one using a candle and one using a Bunsen burner. For each trial, determine the change in temperature during each minute of heating. Use that change in temperature and the formula q = mc(delta)T to calculate the amount of heat added.

For example, suppose one group started their experiment with 17 C water. At time zero, the temperature is 17 C. Suppose, also, that the water reached a temperature of 18.5 C after one minute. The change in temperature is, therefore, 1.5 C in the first minute. Since the mass of the water is 100 g, and the specific heat capacity of water is 4.184 J/g C, the amount of heat added is q = (100g) (4.184 J/g C) (1.5 C) = 630 J. There are only two significant figures possible because of the small temperature change. The mass of the water also has at least two significant digits, even if we assume a large amount of uncertainty, like 100 +/- 10 g.

Students would continue to analyze the data this way for each minute of the experiment. For example, if the water heats up another 3.0 degrees between the 1st and the 2nd minute, we know that 1300 J were added during the second minute. If the water heats up 3.5 degrees between the 2nd and 3rd minute, we know that 1500 J were added.

Once the analysis is completed for both of the trials, students will have a series of numbers for their graph. In the example above, the first three values in the graph are (1 min, 630 J), (2 min, 1300 J), (3 min, 1500 J). Plot these points as a scatter plot, but this time you may connect the dots. Put the information for both the candle and the Bunsen burner together on one graph.

Good luck with the assignment. Please complete it for Monday. If you have any questions, feel free to start a discussion in the discussion session of this page. Mr. Robinson will respond during the day Friday or during the weekend

Howard Hae-Woong





Sam's Graph By EPIC

ESTHER'S GRAPH☝ (Aman's Graph on the top)

(Kevin's Graph on the top)

**By - Srishti

BY ELLI (ABOVE)



By Miyu**