1. Change of State Focussing on water

2. Water can exist as three states at ambient temperatures Solid (Ice) Liquid (Water) Gas (water vapour or steam)

3. How do we change from one to another?

4. Experiment: What happens when you boil water ? What temperature does tap water boil at? Does this temperature change if you have other substances in the water?

5. Equipment Use identical beakers and the same thermometer for each experiment

6. Safe Practice What is necessary?

7. Your samples in 250 ml beakers 100 mL tap water 100 mL tap water + 2 teaspoons salt 100 mL tap water + 4 teaspoons salt 100 mL tap water + 6 teaspoons salt

8. Your results Download the file Salty Water Excel Graphing File from the Intranet and record your results. They will graph automatically. Temperature Changes Time (min) Amount of Salt added (tsp)012345678910 0 2 4 6

9. Your Conclusions