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PRACTICE

Freeonesboard Milena Velba

Hooke's Law Practice: Heating curve of alcohol-water mixture 50%


A heating curve is the result of graph values the temperature with time. To make this graph, we need the following materials:

1. 25 cm 3 alcohol.

   ³ 25 cm of water.

2. Probe.
3. Bunsen burner.
4. tripod and screen. Thermometer
6. 10 ml Erlenmeyer flask.
7. Support and walnut.

We measured the stated amounts of water and alcoholism and we've poured into the flask. Once placed the flask on the stand and screen, enter the thermometer, being careful not to touch the walls of the container and in contact with the liquid, and we lit the Bunsen burner flame.
Every thirty seconds we took the temperature data

and these data were recorded in a table:



Then pass this data to your computer:



The experimental data table is this:

13 97.6 14 97.7 15 97.7

t. (Min)	T ª (º C)
0	23.6
0.5	27
1	37,3
1,5	51
2	60
2,5	70
3	80
3,5	82,3
4	82,4
4,5	82,9
5	83,1
5,5	83,4
6	83,8
6,5	84,2
7	84,6
7,5	85,3
8	85,9
8,5	86,7
9	87,6
9,5	88,6
10	90,3
10,5	92,7
11	95
11,5	96,2
12	97
12,5	97,5
	13.5 97.7
14, 5	97.7

And the resulting graph is:

As we can see, this is the graph of heating a mixture, because the temperature is not constant over time, as in the case of pure substance, as in the example below: