2. Does hot water or cold water boil faster?
3. Does salt water freeze faster or slower than regular water?
3. Does salt water freeze faster or slower than regular water?
Pictures of the experimental materials and set up...
Hypothesis:
- The cold water will freeze faster than the warm water because it is closer to the freezing point.
- The hot water will boil faster than the cold water because it is closer to the boiling point.
- The salt water will freeze slower than regular water because salt "melts" ice.
Data in the form of a graph…
(Trial One) | Hot Water (100 F) | Cold Water (55 F) | Salt Water (75 F) | Regular Water (75 F) |
Minutes to Boil | 3:02.8 (2 cups) | 4:53.8 (2 cups) | NA | NA |
Minutes to Freeze | 9:18.0 (1 tbs) | 13.54.8 (1 tbs) | 34:18.9 (1/4 cup with 1 tsp salt) | 48:57.8 (1/4 cup) |
Data of experiment repeated…
(Trial Two) | Hot Water (100 F) | Cold Water (55 F) | Salt Water (75 F) | Regular Water (75 F) |
Minutes to Boil | 3:14.6 (2 cups) | 4:42.7 (2 cups) | NA | NA |
Minutes to Freeze | 9:37.4 (1 tbs) | 14:02.0 (1 tbs) | 32:17.2 (1/4 cup with 1 tsp salt) | 45:34.8 (1/4 cup) |
Controlled Variables –
Temperature of water (before freezing or boiling)
Temperature of burner (on hi at all times)
Temperature of freezer
Amount of water boiled (2 cups)
Amount of water frozen (1 tbs)
The boiling pan stayed the same throughout (cooled thoroughly each time)
The ice cube tray also stayed the same
Amount of salt added (1 tsp)
Amount of water frozen (during salt experiment) - 1/4 cup
Theory –
Cold water freezes faster than warm water because it is closer to the freezing point. In the same sense, hot water boils faster than cold water because it is closer to the boiling point. Salt water freezes slower than regular water because adding salt lowers the freezing point.
Image of the atoms that make up water molecules...
Video or animation that shows how water molecules are arranged in the three states of matter for water…
Click the following link - http://www.youtube.com/watch?v=s-KvoVzukHo
The Scientific Method/Process
1. Ask Question
It is important to start off the scientific method by asking a question. The questions that were asked during the experiment above were...
- 1. Does hot water or cold water freeze faster
- 2. Does hot water or cold water boil faster?
- 3. Does salt water freeze faster or slower than regular water?
After figuring out what questions to ask, it is important to do some research. For this experiment, I did my background research by searching the Internet. I looked for answers to each of the above questions. I found that most sources believed that cold water would freeze faster than hot water, hot water would boil faster than cold water, and salt water would freeze slower than regular water.
3. Construct Hypothesis
After the research has been completed, it is necessary to come up with a hypothesis. The hypothesis I came up with for this activity was...
Hot water will boil faster than cold water.
Cold water will freeze faster than hot water.
Salt water will freeze shower than regular water.
4. Test with an Experiment
After coming up with a hypothesis, it is time to set up an experiment. You can see how I set up the experiment by the above pictures.
5. Analyze Results/Draw Conclusion
When the experiment is completed, it is important to analyze the results and make conclusions. From the experiment I completed, I saw that…
Cold water did freeze faster than hot water.
Hot water did boil faster than cold water.
Salt water did freeze slower than regular water.
I can conclude that hot water boils faster than cold water because it is closer to the boiling point, cold water freezes faster than hot water because it is closer to the freezing point, and salt water freezes faster than regular water because salt lowers the freezing point.6. Report Results
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