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| Materials |
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| Boiling water |
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| water in the freezer |
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| measuring salt |
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| making sure the water is cold and not hot. |
1. pictures above
2.I think that cold water freezes
faster
I think that hot water boils faster
I think that regular water freezes faster
3. & 4.
| Trial 1 | Trial 2 | Trial 3 | ||
| Freezes | ||||
| Cold | Faster | Faster | Faster | |
| Hot | 15 mins slower | 13 mins slower | 15 mins slower | |
| Boils | ||||
| Cold | 3:38 | 3:15 | 3:00 | |
| Hot | 2:21 | 1:51 | 1:54 | |
| Freezes | ||||
| Salt | slower-slushy | slower-slushy | slower-slushy | |
| Regular | faster -60 min | faster-60 min | faster-60 min |
5. My controlled variables were the
temperature of the water. I made sure that the temperature was the same each
time. Also the amount of water and salt I used each time was the exact same.
The last controlled variable was the same size pot was used each time.
6. I think that the warm water
boiled faster because it was closer to the boiling temperature, compared to the
cold water. My theory is the same for the freezing of cold water, because the
water was colder so it had less degrees to drop to be frozen than the hot
water. My theory for the regular water freezing before the salt water is that
when salt is in water it takes a much lower temperature to freeze than normal
water.
7.
9. The scientific method is when you
have a question to begin with, such as what water freezes fastest, cold or hot?
Than you develop a hypothesis, such as, I think that cold water freezes
fastest. Than there needs to be an experiment to test the hypothesis. In this
case I put cold water in the freezer at the same time that I put the hot water
in. Then I repeated the process three times so I was sure that it was as
accurate as it could be. Then I formulated a theory. I think that the cold
water froze faster because it was closer to the freezing point than the hot
water. Lastly, this theory would be repeated many times to make sure that it is
accurate.
10. Doing the experiments more than
once really helps with the accuracy of the results. The more times that a
person collects data the more they can see if there are outliers or if the data
is similar. If the experiment is only done once than I don’t know if it was by
chance that I got that answer or if it is the truth. The averages from my
experiments were when I froze water the cold water- 50 minutes, hot water 66
minutes, regular water 60 minutes, and salt water I took it out of freezer at 90 minutes and it wasn’t frozen
yet. When I boiled water, hot water- 2 minutes and 15 seconds, and cold water-
3 minutes and 17 seconds. These were the
averages of my data, and I noticed that all of my data was very close I did not
really have any outliers.
11.
Science
concepts are things that are around us on a daily basis and often times we use
them without even thinking about them. Once science concept is scientific laws,
these are groups of data that describe something that is natural. One example
of this that we use many times is gravity, we always use it but we don’t often
times think about it. Another science concept that we use a lot are hypothesis,
these are questions that are formulated through observations. Than once a
person tests the hypothesis the person reaches a theory, which is another
scientific concept.
In my experiment I had enough plastic cups to do my experiment
three times. I put 1 cup of cold water in a cup, and then 1 cup hot water in a
cup, and they were the same size, than I put them in the freezer. I checked on
them after 30 minutes and then every 10 minutes after that. Once the water was
frozen I repeated the process twice in different cups. I recorded the data
after each time they came out of the freezer. Next I moved onto the regular
versus salt water freezes fastest experiment. I put ½ cup of water in a cup, and
then in the other cup I put ½ cup of water and tsp. of salt in the cup. I put
them both in the freezer. Once again, I checked on them after 30 minutes and every
10 minutes after that. After 60 minutes I took the regular water out because it
was frozen. I left the the salt water in for 90 minutes and it was not frozen
yet. After this experiment was done I repeated it twice with different cups. Once
I was done with that one I moved onto boiling water. I started by putting 1 cup
of cold water in a pit and turning the burner on high. After about 3 minutes it
was done, so I dumped it out and put in 1 cup of hot water. After about 2
minutes that was boiling so I shut the burner off and recorded that data. I did
the same process two more times. My data was very close to each other. The
slowest time for hot water boiling was 2:21 and the fastest was 1:51. The slowest
data for cold water boiling was 3:38 and the fastest was 3:00 minutes. These
pieces of data are close to each other and show how the hot water boils faster.
This goes along with my theory that hot water boils faster because it is closer
to boiling temperature. When I was
freezing water the cold water froze at an average of 50 minutes. When the hot
water was about 14 minutes slower than the cold, about 64 minutes. This proves
that the cold water freezes faster. I believe that this is true because the
cold water is closer to the freezing temperature. Lastly, there is the salt
water versus the regular water. The regular waster was frozen after just 60
minutes, when the salt water was not after 90 minutes.
These concepts relate to the real world because we use
natural laws every day, like gravity. We know that if something goes up it
needs to come back down. Also we use hypothesis and make theories many times,
but we may not always call it that. When we have a problem we come up with a
possible solution than test it, and if it works than make a theory from there.
Most people now call it problem solving rather than using the scientific method
though. I learned that science is all around us and that we use it many more
times than what we actually think we do.
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