Activity #1
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?
1.
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?
1.
2. I think that cold water will freeze faster because it is closer to the freezing temperature.
I think that hot water will boil faster because it is closest to boiling temperature.
I think regular water will freeze faster because salt is used to break down ice during icy conditions so I feel that it wont freeze as fast.
3 and 4. Look to picture diagrams
5. For the boiling and freezing of hot and cold water, the controlled variables would be the temperatures in which I kept the water. For the salt vs. regular water, the controlled variable would be the regular water because it has nothing added to it.
6. For the first and second experiments, it was a matter of which will boil or freeze faster. For both the experiments the water temperature that was closest to the desired outcome was the fastest. This happened because the water had less degrees to either heat or cool towards. The salt water took longer to freeze than the regular water because salt slows down the water molecules and this means that the water containing salt will need to be at a lower temperature in order to freeze.
7. See picture
8. Arrangement Of Molecules In The Three States Of Matter
9. The scientific method is a process in which one goes through in order to test a hypothesis. We use these hypothesis to make predictions just as I did in question 2. We then go through and test these hypothesis to see if we have made the right observations. I tested my hypothesis by freezing, boiling, and salting my water. After we have results we are able to see if we were right and we can therefore repeat the experiment until we are sure we have the correct results. In my experiments I made my hypothesis and then went through and boiled, froze and salted my water. Using a timer and watching the water very closely for each experiment going on I reported the times at which they froze or boiled at. This was done three times to make sure that I was getting the right results. It happened that my hypothesis all were correct from what I observed.
10. I had to repeat the experiments three times each. With the first experiment, Cold water vs. Hot water freezing I found that cold water's time to freeze was an average of 19.55 minutes. Hot waters average time of freezing was 28.43 minutes. The second experiment was the boiling of hot water vs. cold water. I found that cold water boiled on an average of 6.16 minutes, while hot water boiled after only 4.26 minutes on average. At the last experiment that I observed was whether salt water or regular water froze faster. On average regular water froze faster at a time of 19.69 minutes and salt water froze after 33.13 minutes. Repeating the experiment was important because I got different times for the water temperature changing, but my results did not change which means that they are most likely true- since they happened over and over.
11. Throughout this experiment many things were going on that the eye can't see. For each experiment something different was happening with the water molecules. While I was comparing the hot vs. cold water freezing the molecules in the two different temperature waters were doing the same thing at a different rate. Hot water molecules are moving faster so in order for the water to freeze these molecules need to come to a complete stop. The hot water then would take longer to freeze because the molecules have a harder time slowing down as fast and the cold water which is already moving more slowly. For the 2nd experiment it has somewhat the same affect. The hot water is already moving faster and therefore is able to move extremely fast to allow it to boil and evaporate the water. Cold water on the other hand was moving much slower and it wasn't as easy for it to get moving as fast as the hot water. The last experiment had salt added to water before freezing it compared to regular water. The salt in the water caused the water to need to slow down even more in order for the salt-water mix to freeze. The salt lowers the freezing point and that is why it takes longer than regular water to freeze.
My experiments were run pretty basic. For the freezing experiments I put the hot and cold water in containers that looked the same and set them outside. The weather is so cold that it worked great to freeze the water, and I was able to watch from inside. My data came back with a range of all about the same numbers for all three experiments which makes me feel confident that the end results were correct. Using my hypothesis and the ending conclusions I found that my hypothesis were correct and that I had assumed the right things. The boiling water experiment worked about the same as the other 2 experiments that I did. I did one pan of hot water and one pan of cold water and set the temperature on high and put the lid on both. I timed when they started boiling and that was what I used as my data to ensure that my hypothesis was correct.
I think that hot water will boil faster because it is closest to boiling temperature.
I think regular water will freeze faster because salt is used to break down ice during icy conditions so I feel that it wont freeze as fast.
3 and 4. Look to picture diagrams
5. For the boiling and freezing of hot and cold water, the controlled variables would be the temperatures in which I kept the water. For the salt vs. regular water, the controlled variable would be the regular water because it has nothing added to it.
6. For the first and second experiments, it was a matter of which will boil or freeze faster. For both the experiments the water temperature that was closest to the desired outcome was the fastest. This happened because the water had less degrees to either heat or cool towards. The salt water took longer to freeze than the regular water because salt slows down the water molecules and this means that the water containing salt will need to be at a lower temperature in order to freeze.
7. See picture
8. Arrangement Of Molecules In The Three States Of Matter
9. The scientific method is a process in which one goes through in order to test a hypothesis. We use these hypothesis to make predictions just as I did in question 2. We then go through and test these hypothesis to see if we have made the right observations. I tested my hypothesis by freezing, boiling, and salting my water. After we have results we are able to see if we were right and we can therefore repeat the experiment until we are sure we have the correct results. In my experiments I made my hypothesis and then went through and boiled, froze and salted my water. Using a timer and watching the water very closely for each experiment going on I reported the times at which they froze or boiled at. This was done three times to make sure that I was getting the right results. It happened that my hypothesis all were correct from what I observed.
10. I had to repeat the experiments three times each. With the first experiment, Cold water vs. Hot water freezing I found that cold water's time to freeze was an average of 19.55 minutes. Hot waters average time of freezing was 28.43 minutes. The second experiment was the boiling of hot water vs. cold water. I found that cold water boiled on an average of 6.16 minutes, while hot water boiled after only 4.26 minutes on average. At the last experiment that I observed was whether salt water or regular water froze faster. On average regular water froze faster at a time of 19.69 minutes and salt water froze after 33.13 minutes. Repeating the experiment was important because I got different times for the water temperature changing, but my results did not change which means that they are most likely true- since they happened over and over.
11. Throughout this experiment many things were going on that the eye can't see. For each experiment something different was happening with the water molecules. While I was comparing the hot vs. cold water freezing the molecules in the two different temperature waters were doing the same thing at a different rate. Hot water molecules are moving faster so in order for the water to freeze these molecules need to come to a complete stop. The hot water then would take longer to freeze because the molecules have a harder time slowing down as fast and the cold water which is already moving more slowly. For the 2nd experiment it has somewhat the same affect. The hot water is already moving faster and therefore is able to move extremely fast to allow it to boil and evaporate the water. Cold water on the other hand was moving much slower and it wasn't as easy for it to get moving as fast as the hot water. The last experiment had salt added to water before freezing it compared to regular water. The salt in the water caused the water to need to slow down even more in order for the salt-water mix to freeze. The salt lowers the freezing point and that is why it takes longer than regular water to freeze.
My experiments were run pretty basic. For the freezing experiments I put the hot and cold water in containers that looked the same and set them outside. The weather is so cold that it worked great to freeze the water, and I was able to watch from inside. My data came back with a range of all about the same numbers for all three experiments which makes me feel confident that the end results were correct. Using my hypothesis and the ending conclusions I found that my hypothesis were correct and that I had assumed the right things. The boiling water experiment worked about the same as the other 2 experiments that I did. I did one pan of hot water and one pan of cold water and set the temperature on high and put the lid on both. I timed when they started boiling and that was what I used as my data to ensure that my hypothesis was correct.
For the salt water experiment I think that it was very important for someone to discover this because now days we use salt to break down ice in the cold winter conditions. This works the same as in water. It drops the freezing point and doesn't allow it the water to freeze. For the hot or cold water freezing faster I have the example that I help my grandmother out on the farm and during the winter months it would be very beneficial for us to know that warm water freezes more slowly than cold water. Knowing this we would fill her animal drinking troughs with warm water for the animals so that they would have a longer amount of time to drink from it. For the hot vs. cold water boiling faster experiment, if I were in a hurry to cook some mac n' cheese before class I would know to use hot water because it would boil faster and I would be able to eat it and get to my class faster.
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