Chmeistry Lab on Energetics
Data collection and processing
Qualitative observation
Before * Blue solution of copper sulfate * Grey zinc powder
During * Blue color solution changes to greyish black * Heat is given out, so the surroundings become hotter.
After * Grey powder remains on the sides of the cup * Precipitate formed at the bottom of the cup
List of chemicals and apparatus used
Chemicals used
Copper sulfate solution, 1 mol dm-3
25g of zinc powder
Apparatus needed
Pipette, 25ml
Pipette filler
Polystyrene cup with lid
Spatula
Digital balance
Thermometer (0-100*C)
Stopwatch
Data collection
Raw Data
| Trial 1 | Trial 2 | Trial 3 | | Temperature/ *C±0.1 | Time/s(±0.1) | | | | 0.0 | 25.6 | 25.9 | 25.7 | 30.0 | 25.6 | 25.9 | 25.7 | 60.0 | 25.5 | 25.9 | 25.7 | 90.0 | 25.5 | 25.9 | 25.7 | 120.0 | 25.6 | 25.9 | 25.7 | 150.0 | 25.5 | 25.9 | 25.7 | 180.0 | 25.5 | 25.9 | 25.7 | 210.0 | 49.4 | 50.2 | 51.2 | 240.0 | 52.2 | 67.6 | 56.9 | 270.0 | 56.5 | 69.8 | 61.2 | 300.0 | 58.9 | 69.3 | 63.8 | 330.0 | 62.5 | 68.4 | 67.9 | 360.0 | 61.7 | 67.9 | 68.5 | 390.0 | 62.8 | 66.8 | 66.5 | 420.0 | 63.2 | 66.2 | 65.2 | 450.0 | 63.9 | 65.1 | 64.2 | 480.0. | 65.5 | 64.1 | 63.1 | 510.0 | 64.1 | 63.3 | 63.1 | 540.0 | 63.7 | 63.3 | 62.2 | 570.0 | 63.5 | 62.6 | 61.9 | 600.0 | 63.2 | 62.0 | 61.3 |
Table showing the temperature and time for the first three trials
After this, a graph was plotted of the average temperature against time. The line produced on this graph was the extrapolated till the 170s mark. The equation of the line was found. The two equations were the equated, the downward sloping and the vertical line and the maximum temperature reached by the reaction was found. Change in temperature was found by subtracting the value obtained by the initial temperature value.
Equation of the downward line
y= -0.0064x+66.857
Equation of vertical line
Qualitative observation
Before * Blue solution of copper sulfate * Grey zinc powder
During * Blue color solution changes to greyish black * Heat is given out, so the surroundings become hotter.
After * Grey powder remains on the sides of the cup * Precipitate formed at the bottom of the cup
List of chemicals and apparatus used
Chemicals used
Copper sulfate solution, 1 mol dm-3
25g of zinc powder
Apparatus needed
Pipette, 25ml
Pipette filler
Polystyrene cup with lid
Spatula
Digital balance
Thermometer (0-100*C)
Stopwatch
Data collection
Raw Data
| Trial 1 | Trial 2 | Trial 3 | | Temperature/ *C±0.1 | Time/s(±0.1) | | | | 0.0 | 25.6 | 25.9 | 25.7 | 30.0 | 25.6 | 25.9 | 25.7 | 60.0 | 25.5 | 25.9 | 25.7 | 90.0 | 25.5 | 25.9 | 25.7 | 120.0 | 25.6 | 25.9 | 25.7 | 150.0 | 25.5 | 25.9 | 25.7 | 180.0 | 25.5 | 25.9 | 25.7 | 210.0 | 49.4 | 50.2 | 51.2 | 240.0 | 52.2 | 67.6 | 56.9 | 270.0 | 56.5 | 69.8 | 61.2 | 300.0 | 58.9 | 69.3 | 63.8 | 330.0 | 62.5 | 68.4 | 67.9 | 360.0 | 61.7 | 67.9 | 68.5 | 390.0 | 62.8 | 66.8 | 66.5 | 420.0 | 63.2 | 66.2 | 65.2 | 450.0 | 63.9 | 65.1 | 64.2 | 480.0. | 65.5 | 64.1 | 63.1 | 510.0 | 64.1 | 63.3 | 63.1 | 540.0 | 63.7 | 63.3 | 62.2 | 570.0 | 63.5 | 62.6 | 61.9 | 600.0 | 63.2 | 62.0 | 61.3 |
Table showing the temperature and time for the first three trials
After this, a graph was plotted of the average temperature against time. The line produced on this graph was the extrapolated till the 170s mark. The equation of the line was found. The two equations were the equated, the downward sloping and the vertical line and the maximum temperature reached by the reaction was found. Change in temperature was found by subtracting the value obtained by the initial temperature value.
Equation of the downward line
y= -0.0064x+66.857
Equation of vertical line