Rates of dissolving

This task is about how temperature affects dissolving of sugar.

Amanda and Ned wanted to find out how much sugar would dissolve in water at different temperatures. For each temperature they tested, they put 100 mL of water into a cup, and then added sugar until no more would dissolve.

Here are their results.

Temperature (°C)	Amount of sugar dissolved (grams)
10	20
30	60
40	90
60	120
80	185

a)	Draw a line graph to show the above results. The first point has been done for you. Remember to make sure your graph has a title and a label with the correct unit for the bottom axis.
	Title: ____________________________________________________ Label: ______________________________ (Unit: _______)

Write a sentence about the temperature of the water as it increases and the amount of sugar that dissolves.

Here are some results for salt dissolved in water of different temperatures.

Temperature (°C)	Amount of salt dissolved (grams)
10	30
30	30
40	30
60	30
80	30

Write a sentence about the temperature of the water and how much salt will dissolve.

	Y5 (09/2002)	Y6 (09/2002)	Y7 (09/2002)	Y8 (09/2002)
Appropriate title given	very difficult	very difficult	very difficult	difficult
An incomplete title given	difficult	moderate	moderate	moderate
Line graph drawn	difficult	moderate	moderate	easy
All points plotted correctly	moderate	easy	easy	easy
1 mistake made in plotting	easy	easy	very easy	very easy
x axis labelled: Temperature	difficult	moderate	moderate	easy
x axis unit: °C	difficult	difficult	moderate	moderate
b) More sugar will dissolve as the water temperature increases.	difficult	difficult	moderate	moderate
c) The amount of salt that dissolved was always the same (in different water temperatures).	difficult	difficult	moderate	moderate

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Rates of dissolving

Rates of dissolving