1. Does hot water or cold water freeze faster?
I think that cold water will freeze faster because it is colder than hot water which means that is closer to the freezing point. The hot water will need to cool before it can start to freeze which would make it freeze slower.
2. Does hot water or cold water boil faster?I think that hot water will boil faster because it is closer to the boiling point than cold water. The cold water would need to warm up first before it can boil which would make it boil slower.
3. Does salt water freeze faster or slower than regular water?I think that salt water will freeze slower than regular water. I think this will happen because salt is used to melt snow so (to me) it makes sense that salt water would freeze slower than regular water.
Pictures of My Experimental Materials and Setup
-
The ice tray labeled “cold” has formed ice on top of the cubes (at 70 minutes). The cold water freezes first. The hot water began to form ice on the top of the cubes but there was still open water on the top of the cubes.
-
-
The glass labeled “regular” has formed ice on top of the water (at 90 minutes). The “regular” water freezes first. The salt water has formed a tiny bit of crystals on the side of the glass.
-
-
-
The hot water boiled in 2.10 minutes.
-
-
The cold water boiled in 3.09 minutes.
Data in the Form of a Table
Hot Water (1 ½ cups) Freeze Time | Cold Water (1/2 cups) Freeze Time |
| 95 minutes (layer of ice on top cubes) | 70 minutes (layer of ice on cubes) |
Salt Water (1/2 cup of room temperature) Freeze Time | Regular Water (1/2 cup room temperature) Freeze Time |
| At 90 minutes ice/salt crystals began to form on the sides of glass | 90 minutes (layer of ice on cubes) |
| Cold Water (2 cups) Boil Time | Hot Water (2 cups) Boil Time |
| 3 minutes and .09 seconds | 2 minutes and 10 seconds |
Data of Experiment Repeated
Hot Water (1 ½ cups) Freeze Time | Cold Water (1/2 cups) Freeze Time |
| 100 minutes (layer of ice on top of cubes) | 70 minutes (layer of ice on top of cubes) |
Salt Water (1/2 cup of room temperature) Freeze Time | Regular Water (1/2 cup room temperature) Freeze Time |
| At 90 minutes ice/salt crystals began to form on the sides of glass | 90 minutes (layer of ice on top) |
| Cold Water (2 cups) Boil Time | Hot Water (2 cups) Boil Time |
| 3 minutes and 5 seconds | 2 minutes and 18 seconds |
List Of My Controlled Variables from My Experiment
· 2 ice cube trays (same kind)
· Same amount of water for hot water and cold water (1 ½ cups poured in each ice cube tray)
· Recorded the freeze time for salt, hot, and cold water when a layer of ice formed on the top of the cubes and in the glasses (cubes and glasses were not entirely solid when recorded)
· 2 of the same glasses
· Same amount of water for salt water and regular water (1/2 cup of room temperature water for each glass)
· Same pot for water to boil in (room temperature water) (waited for pot to cool again before testing the next 2 cups of water)
· Temperature of stove was the same for both cold and hot water (set on high heat)
· Same amount of water for the hot and cold water that was to be boiled (2 cups of hot water and 2 cups of water for cold water)
· Recorded the boil point time when both the cold and hot water started to bubble
After conducting the three experiments twice, I have come to three conclusions.
First, I have found that cold water freezes faster than hot water. The cold water is at a colder temperature than the hot water therefore it is able to freeze faster. Hot water must cool down first before it can start the freezing process.
Second, I found that regular water freezes faster salt water. In fact salt water takes a very long time to freeze because it slows down the process. The salt interferes with the freezing process because salt makes the water more dense than regular water.
Third, I found that hot water boils faster than cold water. This is similar to my first conclusion, except the opposite. Since hot water is closer to the boiling point it boils faster. The cold water must heat up first therefore it takes longer for cold water to boil.
***In my apartment, I don’t think that my water heater is regulated. My tap water gets unbelievably hot which is why I believe my hot water boiled so fast. So my hot water may be hotter than the average person’s tap water. I have burned my hands many times and if I had children I would be calling my landlord!
Image of the Atoms that Make up Water Molecules
-
A water molecule is made up of 2 hydrogen (H) atoms and 1 oxygen (O) atom that are bonded together.
-
Water molecules are attracted to other water molecules like shown in the picture above.
Video of how Water Molecules are Arranged (3 States of Matter)
· Click on the link below (or copy and paste link) to view video:
Scientific Method/Process and how Each Step Correlates to My Experiments
1. Ask a Question
The questions I asked were as follows:
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?
When coming up with questions it is important that the questions are measureable so a conclusion can be made.
2. Conduct Background Research
I looked up the questions on the internet before conduction the experiment myself and found that most of the websites believe that cold water freezes faster, hot water boils faster, and regular water freezes faster. However, there were a few websites that explained these conclusions can be controversial. For example, there is a possibility that hot water can freeze faster than cold water depending on the variables within the experiment.
It is important to do research so you know what to expect and do not conduct an experiment that will not work.
3. Conduct a Hypothesis
I predicted that hot water would boil faster than cold water, cold water would freeze faster than hot water, and regular water would freeze faster than salt water. After conducting the experiments I found that my hypothesis was correct.
It is important to state a hypothesis in a way that can be measured. The hypothesis should be constructed in a way that will answer the original question.
4. Experiment to Find Answers
By experimenting you can test whether your hypothesis if false or true. You want to be sure that there are controlled variables like the ones I have posted above.
It is important to repeat an experiment at least twice in order to be sure you made no mistakes in the first experiment. When I conducted my experiment a second time, I found that the freezing times and boiling times were pretty much the same which assures me that I made no major mistakes while experimenting.
5. Come to a Conclusion
After you have completed the experiment you want to review all of your data and develop a theory. I developed three theories after conducting my experiments.
First, I have found that cold water freezes faster than hot water.
Second, I found that regular water freezes faster salt water.
Third, I found that hot water boils faster than cold water.
No comments:
Post a Comment