Freezing Ice to Liquid Water to Boiling Steam Lab
January.11, 2010Period. 2


Question: What will happen to the temperature of water as it changes state?Hypothesis: If a solid such as ice is heated, it will begin to turn to a liquid state known as water. As water is heated it will then turn to a gas state known as water vapour. So the more time that water is heated, the hotter the water will get which will then cause it to form big bubbles that will rise to the top causing it to boil.Materials:250mL crushed iceStirring rodThermometer with degrees in Celsius (up to Stop watch that displays minutes and secondsHot plateStand and clamp apparatusGoggles
250mL beakerData and Observations: See attached table.Procedure: 1. took our line graph and made a prediction of what will happens to the temperature of the waters as it changes state2. Place the crushed ice in the beaker. Stir the ice with the stirring rod. Place the thermometer in the beaker and measure the temperature. Record this temperature in your table in your table at the temperature at 0 minutes. Remove the thermometer. Record your observations of any changes you see in the right hand column of the table3. After 1 minute stir the ice again. Then measure and record the temperature. Record your observations of any changes you see in the right hand column of your table.4. Repeat step 3 every minute, until 5 minutes after all the ice has melted. Record your observations of any changes you see in the right hand column of your table5. To find out what happens to the temperature of water as it boils, your teacher will do a demonstration as shown on the left. Record the temperature every minute as the water is heated and for at least 5 min after it begins to boil. Record your observations of any changes.Analyze: 1. Use your data to create a line graph of temperature versus time. See attached line graph.2. On your graph, label the melting point and the boiling point.
3. Question: What do you think would happen to the temperature if you continued to boil the water, and then heat the water vapour?

Answer: If I continued to boil the water the temperature would begin to rise causing it to boil. If I then continued to heat the water vapour, the water vapour would begin to evaporate. Conclusion: Apply and extend:
5. Question: Is the following statement always true, sometimes true, or never true? Explain your answer based on your data. “When heat is added to a solid, it causes an increase in temperature.”
Answer: This statement is not true because it depends on the volume of the solid. For example the outside of a solid is going to increase in temperature quicker then the inside causing the outside of the solid to begin to melt and rise in temperature while the inside may still be frozen. 6. Question: Suppose that you are camping in the fall. You leave some water in a pail overnight. The next morning, you notice a layer of ice on the top of the water. What is the temperature of the water just below the ice?
Answer: I think that the water below the ice would be above freezing or greater than 0˚ํC (which is the freezing point of water), because the water is only frozen on the surface and not underneath. 7. Question: The melting point of pure water at sea level is 0˚C. The boiling point of pure water at sea level is 100˚C. In this investigation, what was the melting point of your water? What was the boiling point of your water? If your values are different from those above, what are some possible reasons?


Answer: The melting point of our water in this investigation was 23˚ Celsius. The boiling point in our investigation was 88˚ Celsius.
Some possible reasons would be the surrounding temperature in the room where the experiment was done; the time it took for the water to melt, the amount of water in the beaker, the temperature of the water when it was first poured in the beaker.