Mg turnings are dropped into a coffee cup calorimeter containing a solution of 2

Question

Mg turnings are dropped into a coffee cup calorimeter containing a solution of 25.0 mL of 3.0M HCl(aq) and 35.0 mL of water. (Mg is the limiting reagent). The temperature of the reaction was measured for about 500 seconds. The temperature curve is shown below. The slope and intercept can be calculated using the slope and intercept using the linear part of the graph after the reaction is complete. The graph can also be used to determine the starting time of the reaction.

40 35 30 25 20 15 50 100 15 200 250 3 350 400 45e 50 First pick points for the linear part of the graph for your slope intercept analysis. You may remember from math that slope intercept formula has the form: y -mx b. The program will generate a trendline and the slope intercept formula for you after finding suitable points for the program. You need to pick a minimum point and a maximum point for the line that is in the linear region Picking a beginning point for the trend line too near the inflection point of the temperature curve will distort your slope and create an error in your final temperature. Picking a final point for the trend lne not near enough the end of the curve will not survey enough data to get an accurate slope. Pick a beginning x point in seconds for your slope analysis (no units). 150 Pick a final x point on the graph (in seconds) for your slope analysis (no units). 400 At what time (in seconds) is the start of the reaction? (no units in answer) -0.01 Submit Answer Incorrect. Tries 10/99 Previous Tries

Explanation / Answer

In the 3rd part where it is asking time at which reaction started, should be 50 as you can see Temperature started increasing at that point.

And you can pick any beginning and end point(between 150 and 450) to find the slope of straight line in the linear part.

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