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1. Why is energy needed to boil water? 2. When water is heated, the temperature eventually reaches a constant value (as in lines 2 and 4 on the graph) and forms a plateau on the graph. What does the plateau indicate? 3. 175 g of water (1) was heated from 15°C to 88°C. How many kilojoules were absorbed by the water?

1. Why is energy needed to boil water? 2. When water is heated, the temperature eventually reaches a constant value (as in lines 2 and 4 on the graph) and forms a plateau on the graph. What does the plateau indicate? 3. 175 g of water (1) was heated from 15°C to 88°C. How many kilojoules were absorbed by the water?

EBK A SMALL SCALE APPROACH TO ORGANIC L
EBK A SMALL SCALE APPROACH TO ORGANIC L
4th Edition
ISBN:9781305446021
Author:Lampman
Publisher:Lampman
Chapter82: Physical Constants Of Liquids: The Boiling Point And Density
Section: Chapter Questions
Problem 5P
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Please note a few things. The knob on the left of the hot plate controls the heat. It is increased at one point near the beginning of the video. The knob on the right controls the stirring mechanism. It is a little confusing at first when there is ice in the beaker; you might mistake the stirrer for an ice cube. Please know that there is a white, magnetic "bean" in the beaker that stirs the liquid when the magnetic stirrer is turned on. That's what the noise is and that's what that object in the beaker. HEAT & STIR OFF/ON POWER ON 100 HAT POWR If you did the experiment this is what it would look like Materials • 500 mL beaker • Water • Ice • Hot plate • Temperature probe (with fancy computer access) • Stirrer • Timer (you'd need one if not for the computer program) Procedure 1. Place 300 mL of ice in a 500 mL beaker. 2. Add enough water to reach the 600 mL line. 3. Add magnetic stirrer to beaker and place on hot plate. 4. Insert temperature probe, ensuring the devise is connect to the computer. 5. Turn on hot plate. 6. Watch and observe as the temperature of the water goes from 0°C to boiling. (here write a few observations you made as you watched this experiment. What did you notice about the beaker? Or the graph? Can you see any sources of error? What did you observer? Include 2 -3 things) Observations:
Transcribed Image Text:Please note a few things. The knob on the left of the hot plate controls the heat. It is increased at one point near the beginning of the video. The knob on the right controls the stirring mechanism. It is a little confusing at first when there is ice in the beaker; you might mistake the stirrer for an ice cube. Please know that there is a white, magnetic "bean" in the beaker that stirs the liquid when the magnetic stirrer is turned on. That's what the noise is and that's what that object in the beaker. HEAT & STIR OFF/ON POWER ON 100 HAT POWR If you did the experiment this is what it would look like Materials • 500 mL beaker • Water • Ice • Hot plate • Temperature probe (with fancy computer access) • Stirrer • Timer (you'd need one if not for the computer program) Procedure 1. Place 300 mL of ice in a 500 mL beaker. 2. Add enough water to reach the 600 mL line. 3. Add magnetic stirrer to beaker and place on hot plate. 4. Insert temperature probe, ensuring the devise is connect to the computer. 5. Turn on hot plate. 6. Watch and observe as the temperature of the water goes from 0°C to boiling. (here write a few observations you made as you watched this experiment. What did you notice about the beaker? Or the graph? Can you see any sources of error? What did you observer? Include 2 -3 things) Observations:
Questions: 1. Why is energy needed to boil water? 2. When water is heated, the temperature eventually reaches a constant value (as in lines 2 and 4 on the graph) and forms a plateau on the graph. What does the plateau indicate? 3. 175 g of water (1) was heated from 15°C to 88°C. How many kilojoules were absorbed by the water? 4. How many kilojoules are required at 0°C to melt an ice cube with a mass of 25 g? 5. How many kilojoules are required to melt 15 g of ice at 0°C and raise the temperature of the liquid that forms to 85°C? 3 2 HEATING TIME 6. Please identify the state of matter at each of the numbered step of the diagram above. Indicate what I happening (absorbing heat? Or changing state?). And indicate which formula you would use to calculate the heat needed or absorbed at each step in the diagram above. Design Your Own You've watched this video. You've seen my procedure and materials list for the heating curve of water. Suppose now you are asked to design an experiment to show the cooling curve of water. You will need to start with boiling water (because let's not worry about capturing steam. So, in other words, you have water boiling along line #4 above (o0ops, did I just give you answer to a previous question?) Design an experiment which will take you from the boiling water to the solid ice cube in #1 above (argh! I keep doing it!) Use what you think is necessary. Be creative. You aren’t conducting this experiment, just writing it. What will need to produce: you A list of materials (in a bulleted list – like I provided) What will you use? You can use common kitchen things rather than lab materials like beakers etc. right now. > A step-by-step procedure. This is where I usually end up writing the bulk of my comments. Be as specific as you can. If you want to start with 3 cups of boiling water, then tell me. Your procedure should be reproducible. That is, I should be able to do exactly what you want me to do in the order you tell me. It's like a recipe. A diagram, like the one above, for the cooling of water. Please add in temperatures along the y-axis. TEMPERATURE
Transcribed Image Text:Questions: 1. Why is energy needed to boil water? 2. When water is heated, the temperature eventually reaches a constant value (as in lines 2 and 4 on the graph) and forms a plateau on the graph. What does the plateau indicate? 3. 175 g of water (1) was heated from 15°C to 88°C. How many kilojoules were absorbed by the water? 4. How many kilojoules are required at 0°C to melt an ice cube with a mass of 25 g? 5. How many kilojoules are required to melt 15 g of ice at 0°C and raise the temperature of the liquid that forms to 85°C? 3 2 HEATING TIME 6. Please identify the state of matter at each of the numbered step of the diagram above. Indicate what I happening (absorbing heat? Or changing state?). And indicate which formula you would use to calculate the heat needed or absorbed at each step in the diagram above. Design Your Own You've watched this video. You've seen my procedure and materials list for the heating curve of water. Suppose now you are asked to design an experiment to show the cooling curve of water. You will need to start with boiling water (because let's not worry about capturing steam. So, in other words, you have water boiling along line #4 above (o0ops, did I just give you answer to a previous question?) Design an experiment which will take you from the boiling water to the solid ice cube in #1 above (argh! I keep doing it!) Use what you think is necessary. Be creative. You aren’t conducting this experiment, just writing it. What will need to produce: you A list of materials (in a bulleted list – like I provided) What will you use? You can use common kitchen things rather than lab materials like beakers etc. right now. > A step-by-step procedure. This is where I usually end up writing the bulk of my comments. Be as specific as you can. If you want to start with 3 cups of boiling water, then tell me. Your procedure should be reproducible. That is, I should be able to do exactly what you want me to do in the order you tell me. It's like a recipe. A diagram, like the one above, for the cooling of water. Please add in temperatures along the y-axis. TEMPERATURE
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