Cooling curve
Working scientifically
(9 Numeracy
Salty water wasbeingboiled on a hotplate. It was then removed from the hotplate and placed
in a freezerto cool. Its temperature was measured every minute.
1 The measurements taken are shown in the table. Constructa graph byplotting these
values on the grid provided.
O;1;2;);3/4]5)]64)7)
Temperature
104}103)102} 91
(°C)
82
70
59
51
8
9
|10}11]12]13)
40
28)
20)
11}
2
14}
-1]-4)
15)
16
-4] -4
2 Useyourgraphto estimate the:
(a) boiling pointof salty water
(b) freezing pointof salty water
110 7
100
90 F
Temperature (°C)
80 F
60 F
50 F
207
10F
-10 Fr
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#15
16
Time (min)
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