LAB REPORT – CHEMISTRY
I.
II.
EXPERIMENT:
PURPOSE: finding the heating curve of water.
HYPOTHESIS: if the water has ice, then the water will take longer to boil.
MATERIALS NEEDED: ring stand, clamp, beaker, Bunsen burner, thermometer probe,
distilled ice and water, metal bar.
PROCEDURE: 1. Take a beaker containing distilled water and ice.
2. put the beaker on top of the Bunsen burner and insert the
thermometer
probe.
3. turn on the Bunsen burner and record the time and temperature.
DATA ANALYSIS: Independent variable - distilled water
- Dependent variable - temperature
- Controlled variables - initial temperature, heat
CONCLUSION: the hypothesis is valid. The water took longer to boil due to the ice.
EVALUATION: the experiment was successful, but the data logger did not record
enough
information.
QUESTIONS:
1. The graph shows the increase of water temperature and the duration.
2. The temperature of water increased steadily as heat was added.
3. The temperature remained constant at 97.6 degrees Celsius.
4. a ) according to my data, the boiling temperature of water is 97.6 degrees
Celsius.
b ) this value is different from 100 degrees Celsius because of pressure.
Low pressure low boiling point
High pressure high boiling point
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