Does hot water or cold water freeze faster?
Hypothesis
The goal of this experiment was to become aware of what freezes faster; hot or cold water. I believe cold water will freeze faster because it is closer to the freezing temperature of 32 degrees Fahrenheit.
Materials
2 bowls
measuring cup
hot and cold water
clock
freezer
thermometer
Setup
1. Fill one bowl with a cup of hot water and the other with a cup of cold water.
2. Record starting temperatures.
3. Put both bowls in the freezer at the same time.
4. Check both bowls of water every ten minutes for ice.
5. Keep checking the water until it reaches freezing temperature.
6. Repeat two more times.
Pictures
Data
Trial 1
Hot Cold
Starting Temp 124 56
10 72 38
20 47 29
30 35
40 24
Trial 2
Hot Cold
Starting Temp 124 56
10 76 42
20 45 34
30 36 30
40 29
Trial 3
Hot Cold
Starting Temp 124 56
10 71 39
20 42 31
30 35
40 23
Graph
Controlled Variables
1. Bowls
2. Temperature of water
3. Temperature of freezer
4. 1 cup water
5. Checked every 10 minutes
Does hot water or cold water boil faster?
Hypothesis
The goal of this experiment was to become aware of what boils faster; hot or cold water. I believe hot water will boil faster because it is closer to the boiling temperature of 212 degrees Fahrenheit.
Materials
2 bowls
measuring cup
hot and cold water
pan
clock
stove
thermometer
Setup
1. Put one cup hot or cold water in a pan.
2. Record starting temperatures.
3. Turn stove to high temp.
4. Watch until water boils.
5. Record time.
6. Repeat two more times.
Pictures
Data
Trial 1
Hot Water- 2 minutes
Cold Water- 4 minutes
Trial 2
Hot Water- 2 minutes
Cold Water- 3 minutes
Trial 3
Hot Water- 2 minutes
Cold Water- 4 minutes
Graph
Controlled Variables
1. Amount of water
2. Temperature of water
3. Temperature of stove
Does salt water freeze faster or slower than regular water?
Hypothesis
The goal of this experiment was to explore if salt water or regular water froze first. I believe regular water will freeze first because salt melts ice.
Materials
2 bowls
measuring cup
table spoon
water
salt
clock
freezer
thermometer
Setup
1. Fill one bowl with a cup of regular water and another bowl with a cup of water and two tablespoons of salt.
2. Record starting temperatures.
3. Put both bowls in the freezer at the same time.
4. Check both bowls of water every ten minutes for ice.
5. Keep checking the water until it reaches freezing temperature.
6. Repeat 2 more times.
Pictures
Data
Trial 1
Regular Salt
Starting Temp 80 80
10 52 52
20 41 44
30 31 36
40 32
Trial 2
Regular Salt
Starting Temp 80 80
10 50 52
20 39 47
30 32 40
40 32
Trial 3
Regular Salt
Starting Temp 80 80
10 52 53
20 42 43
30 32 38
40 32
Graph
Controlled Variables
1. Bowls
2. Amount of water
3. Amount of salt
4. Temperature of water
5. Temperature of freezer
6. Checked every ten minutes
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Theory
I believe that the closer the water is to the temperature of the freezing or boiling point the faster the water will boil or freeze.
Image of Atoms that Make Up Water Molecules
Video of how Molecules are Arranged in Three States of Matter for Water
Copy and paste URL if video does not work: http://youtu.be/v12xG80KcZw
- The scientific method correlates to my own experiments because i have to think of a hypothesis and what the outcome will be. Then I have to try it out even if I my prediction could be wrong. Repeating an experiment is great to make sure you get the same results. With out thinking about the process and outcome of things we do every day we could all be in trouble.
- It is important to repeat experiments to make sure the outcomes are all the same. Each time I repeated these experiments the outcomes were the same. However, this will not always happen making the it a habit to repeat an experiment is extremely important so you get the same average values each time.
These experiments dealt with the three forms of water. The three forms of water are solid, liquid, and gas. Many people are familiar with these because it is part of our every day life. We see water as a solid when its frozen, a liquid when it comes out of the sink, and a gas when it evaporates. Also, in science and every day life most people know that the boiling point of water is 212 degrees Fahrenheit and the freezing point is 32 degrees Fahrenheit.
The results of the experiments were what I expected them to be. Cold water freezes faster than hot water, hot water boils faster then cold water, and regular water freezes faster than salt water. Doing each experiment three times helped a lot because it was neat to see that the results were the same every time. Also, since people learn in different ways, putting the results in a chart, in a graph, as well as posting pictures helped me understand the results.
The experiment was interesting and kind of fun to do. It had to do with things we do everyday but do not think about it. When we can relate to experiments it makes them easier to do. I boil water at least three times a week and I have never thought to put hot water in the pan instead of cold water. After doing this experiment, I now know that hot water will come to a boil much faster than cold water. Now when I make food it gets done much faster. Same with when I freeze water for ice cubes. Instead of putting normal tap water in the ice trays it is faster to put cold water in them. Lastly, after trying to freeze salt water, I now understand why we put salt on ice in the winter months. Salt water takes much longer than regular water to freeze.
