This document describes a student experiment investigating factors that affect the cooling rate of water. It includes the student names, date, aim, hypothesis, variables, materials, method, results table, and sections for conclusions and evaluation. The method had students heat water to different starting temperatures in a beaker, then record the temperature every minute for 10 minutes as it cooled. The results showed that water cooled more slowly when starting at a higher temperature. The conclusion is that higher starting temperature leads to a lower cooling rate.

1. Name: Michael Chang
Partners: Xavier, Byeong jo, Michael
Date of experiment: 29/9/2010
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Aim: Factors that will effect the cooling rate of water.
Hypothesis: Factors that will effect the cooling rate of water.
Variables:
Input variable: starting temperature, variation of starting temps.
Output variable: temperature, using a thermometer.
Control variables:
Control variable 1: amount of water, using a graduated cylinder.
Control variable 2: The container of the water, suing the same beaker
Control variable 3: NONE
Materials:
1. Bunsen burner
2. 250 mL beaker
3. thermometer
4. timer
5. water
6. graduated cylinder
7. tripod
8. gauze mat
9. lighter
10. boss head
11. clamp
12. retort stand

2. Diagram:
Method:
1. Put 250mL of water in the beaker.
2. Set up the Bunsen burner.
3. Put the thermometer inside.
4. Light the Bunsen burner
5. control the temperature.
6. First time: 40 Second time: 50( DETAIL!!)
7. When reach the temperature, turn off the Bunsen burner.
8. Take result for every minute for 10 minutes
Results:
Starting 1m 2m 3m 4m 5m 6m 7m 8m 9m 10m
temperature
40~27 43 43 43 42 42 42 41 41 41 40
50~27 54 55 55 54 53 53 52 51 50 49

3. Conclusion:
Start writing your conclusion here. Remember to:
• comment on any patterns or relationships shown in your data and explain
how you worked these out.
• explain your conclusion using scientific reasoning.
• comment on the reliability of your data. What things were difficult to measure
and why.
My conclusion for my group experiment is that the higher the temperature, the
more time it takes to cool down, therefore, the cooling rate is low.
When we heat the water to certain temperature, we turn off the burner, then the
temperature is still rising. We think that its because although we turn off the
Bunsen burner, the water isn’t cooling down because of its own temperature.
Our data is reliable because we had several tries and we got the same pattern
which is the data.
Evaluation:
Start writing your evaluation here. Remember to:
• comment on the reliability of your method. Did your method give you reliable
data. If so, why? If not, why not?
• Make suggestions about how you could improve your method to make your
data more reliable.
• Make suggestions about further investigations you could do. This will often
involve changing one of the controlled variables in this investigation.
Our result for cooling rate: 40~27 0.3/minute
50~27 0.6/minute

4. My evaluation for our experiment is that our setting for the experiment
is reliable because that we have some reliable results. We can make
our experiment better by listening to the teacher… Because we didn’t
listen to the teacher we did the wrong thing for 30 minutes. If we have
time we will try another 3 times to check our result is constant or
exactly right.
Changes