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1.
Which variable did you choose for the independent variable? Which variable did you choose for
the dependent variable? Explain.
Score
Answer: I chose time to be the independent variable. I did this because had control over time through out
the experiment. I could change time and measure the temperature based on that time I chose. This makes
temperature the dependable variable. The value I get from measuring the temperature is something I can’t manipulate. The
value I obtain depends on what time I measured it.
(12 points)
2.
How did the final temperature of the hot water alone compare to the other two trials? If you had
to add cream to your coffee, when is the best time to add it so that you have the warmest possible
coffee after 15 minutes? Explain your answer using your data. Include your data sheet and the graph
of your data in your answer.
Score
Answer:
By the end of the experiment the result of the three trials was relatively close. But the hot water alone had the highest
temperature. This trial however had faster cooling rate(along with the third trial) than the second trail which had water
added to it after 2 minutes. If I was to add cream to my coffee, I would add it early or before I go somewhere so I can have
the warmest possible coffee. I can conclude this because according to the three trials, cold water added at 2 min had higher
temperature than the one added at 12 min after 15 minutes of measuring. As seen in the data, when cold water was added
after two minutes, the temperature greatly decreased but afterwards the rate of cooling was slow. On the contrary when
water was added after 12 min, the temperature was already low and continued to decrease ending up with the lowest
temperature from the three trials.
Time (min)
Temp. of Hot
Water Alone (°C)
0
0.5
1
1.5
2
2.5
80
79
78
77
75.5
74
3
3.5
73
72
Temp. of Hot
Water When Cold
Water Is Added at
2 Min (°C)
80
79
78
76
75
63 *after cold water
was added
62
62
Temp. of Hot
Water When Cold
Water Is Added at
12 Min (°C)
80
78
77
76
75
74
72.5
71.5
Time (min)
Temp. of Hot
Water Alone (°C)
Temp. of Hot
Water When Cold
Water Is Added at
2 Min (°C)
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
10.5
11
11.5
12
12.5
71
70
69
68
67
66
65
64
63
63
61.5
61
60
59
59
58
57
57
61
60
60
59
58.5
58
57.5
57
56.5
56
55.5
55
54.5
54
53.5
53
52.5
52
13
13.5
1
14.5
15
56
55
55
54.5
52.5
52
52
52
51.5
51
Temp. of Hot
Water When Cold
Water Is Added at
12 Min (°C)
70.5
69.5
69
68
67
66.5
66
65
64.5
63.5
63
62.5
62
61
61
60
59.5
52*after cold water
was added
51.5
51
51
50.5
50
(7 points)
3.
How might you describe the cooling curve for the hot water alone? Was it linear or nonlinear?
How about the cooling curve for the other trials?
Score
Answer:
The cooling curve for the hot water alone was non-linear. This is because the dependent and independent variables didn’t
have a direct relationship. As time increased temperature was decreasing. This also applies to the other trials. The
temperature was decreasing with increasing time so they had an indirect relationship which results in a non-linear cooling
curve.
…
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