Three Experimental Questions to Answer:
1) Does hot water or cold water freeze faster?
a. Cold water
2) Does hot water or cold water boil faster?
a. Hot water
3) Does salt water freeze faster or slower than regular water?
a. Slower
1. Pictures of your experimental materials and setup.
Materials: 2 glasses of water, salt, pan, teaspoon
Water boiling on the stove
Timer
2. Your hypothesis to the questions posed.
· Cold water will freeze faster because the temperature of the cold water is closer to the freezing temperature of water.
· Hot water will boil faster because the temperature of the hot water is closer to the temperature at which water boils.
· Salt water will freeze slower because salt will delay the freezing process.
3. Data in the form of a graph or table
Type of Water (1/2 cup) | Freezing Time #1 | Boiling Time #2 |
cold water | 64 minutes | 2 minutes and 46 seconds |
hot water | 78 minutes | 2 minutes and 27 seconds |
salt water (cold water with 1 tsp salt added) | 98 minutes | n/a |
4. Show data of experiment repeated
Type of Water (1/2 cup) | Freezing Time #1 | Boiling Time #2 |
cold water | 62 minutes | 2 minutes and 43 seconds |
hot water | 75 minutes | 2 minutes and 29 seconds |
salt water (cold water with 1 tsp salt added) | 94 minutes | n/a |
5. List your controlled variables for your experiment
· Same container
· Same amount of water
· Same temperature of hot and cold water
· Same pot for boiling
· Same freezer temperature
· Same stove-top temperature and same burner
6. Formulate a theory that answers the questions posed.
1) Does hot water or cold water freeze faster?
a. Cold water will freeze faster. This is because the hot water must first cool off to the same temperature of the cold water and then begin the same freezing process that the cold water started from the beginning.
2) Does hot water or cold water boil faster?
a. Hot water will boil faster. Much like with cold water freezing faster, the cold water must heat up to the temperature the hot water started at, and then begin the boiling process that the hot water started at.
3) Does salt water freeze faster or slower than regular water?
a. Salt water will freeze slower than regular water. When salt is added to the water, the salt molecules interfere with the water molecules and their ability to join together to become a solid.
8. Video or animation that shows how water molecules are arranged in the three states of matter for water.
· Observation/ask a question: What are you curious about or what have you seen that makes you wonder?
In our experiments, the questions were asked for us.
In our experiments, the questions were asked for us.
o Does hot water or cold water freeze faster?
o Does hot water or cold water boil faster?
o Does salt water freeze faster or slower than regular water?
· Make a hypothesis: What do you think is the answer to your question or the reason for your observation?
o Cold water will freeze faster because the temperature of the cold water is closer to the freezing temperature of water.
o Hot water will boil faster because the temperature of the hot water is closer to the temperature at which water boils.
o Salt water will freeze slower because salt will delay the freezing process.
· Do the experiment: What will you do to test your predictions?
To test my predictions I set up a controlled experiment with variables that both changed and stayed consistent. To ensure that my results were accurate, the experiment was repeated.
· Analyze your results: What did your experiment show? Did the experiment confirm your hypothesis?
o After reviewing the results of my experiment, I found that my hypothesis was correct for all three of the questions that were posed at the beginning of the experiment.
No comments:
Post a Comment