Www.thescienceteacher.co.ukwww.thescienceteacher.co.uk | resources for science teachers who like to think TopicDissolving and temperature LevelKS3 (or.

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| resources for science teachers who like to think TopicDissolving and temperature LevelKS3 (or any course for students aged ) Outcomes1.To investigate how temperature affects the time taken for a sugar cube to dissolve 2.To plot a line graph of your results

Water to add to beakerTemperature of water ( o C) Time taken for sugar cube to dissolve (seconds) 100 ml of kettle water 75 ml of kettle water and 25 ml of tap water 50 ml of tap water and 50 ml of kettle water 75 ml tap water and 25 ml of kettle water 100 ml of tap water 100ml 1. Add 100 ml of water (see table below) to the beaker. BE CAREFUL OF HOT WATER. 2. Record temperature of the water (fill in table). REMOVE THE THERMOMETER. 3. Add one sugar cube and record the time taken for the cube to dissolve with stirring (fill in the table with the time). Now repeat steps 1-3, this time use new water as described in the table below. RESULTS METHOD AIM

1.Plot a graph of your results. 2.Describe what your graph shows. 3.Are your results reliable? Explain your answer. 4.Why is it important that the total volume of water in each experiment was 100 ml? Does this make the experiment reliable or valid?