Exercise

1.    Table 1 shows the result of heating and discontinued heating of 800 ml of water.

	Heating						Discontinued heating
Time (minutes)	0	1	2	3	4	5	6	7	8
Water Temperature (  °C)	40	50	60	70	80	90	80	70	60

Table 1

(a)   Based on the result given in the table, what is the trend of change in the temperature of the water from the 1^st to the 8^th minute?

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(b)   State an inference based on the trend of change in the water temperature in 1(a).

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(c)    Based on the experiment, state what is / are

1. changed___________________________________________________________[1mark]

2. measured__________________________________________________________[1mark]

(d)   If the heating of the water is discontinued, predict the time it will take for the water to return to the temperature of 40 °C.

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