science experiment

Science ExperimentScience Experiment

By Azur EwariBy Azur Ewari

Big QuestionBig Question

How long does it take different volumes of water to How long does it take different volumes of water to freeze at this temprature?freeze at this temprature?

This experiment is to see if a bigger amount of This experiment is to see if a bigger amount of water freezes faster than a smaller volume of water freezes faster than a smaller volume of water.water.

HypothesisHypothesis

My hypothesis is that if you have a bigger My hypothesis is that if you have a bigger volume of water it will take longer time for volume of water it will take longer time for the molecules to go farther apart and the molecules to go farther apart and make the crystals then it will take longer make the crystals then it will take longer time for it to freeze into solid ice, and if you time for it to freeze into solid ice, and if you had a less volume of water it would take had a less volume of water it would take fewer time for it to form crystals and fewer time for it to form crystals and become solid ice.become solid ice.

Interesting factsInteresting facts• When water freezes that is the point when the kinetic energy of water is low

enough that allows water to change to solid state of matter.

• As the water gets colder, its molecules slow down and begin moving far

apart. • Kinetic energy is the energy possessed by a body because of its motion,

equal to one half the mass of the body times the square of its speed.

• It takes a temperature of -5 degrees Celsius (this is just an example, not an actual value) for the water to break its association with the ions and freeze as a pure substance.

• You'll find that adding solute to water generally lowers its freezing point which is why salt melts ice.

MaterialsMaterials

measuring cupmeasuring cup Two containersTwo containers Pitcher with waterPitcher with water ThermometerThermometer freezerfreezer

ProcedureProcedure

I will fill the measuring cup to 4 ounces. I will fill the measuring cup to 4 ounces. Then I will pour the water into the first cup. Then I will pour the water into the first cup. I will then fill the measuring cup to 8 ounces. I will then fill the measuring cup to 8 ounces. Then I’ll pour it into the second cup. Then I’ll pour it into the second cup. Then I’ll take a picture of both of them now.Then I’ll take a picture of both of them now. After that I will put them both into the freezer or fridge and set for around 32 After that I will put them both into the freezer or fridge and set for around 32

degrees F. degrees F. Every ½ an hour then when ice crystals form 5to10min. Every ½ an hour then when ice crystals form 5to10min. When I do this I will also see which one turns to ice first.When I do this I will also see which one turns to ice first. Once one has turned to ice I’ll take a picture of both and show whether more Once one has turned to ice I’ll take a picture of both and show whether more

water takes longer or smaller water takes longer to freeze.water takes longer or smaller water takes longer to freeze.

Control/VariablesControl/Variables

My control is that during the My control is that during the experiment I used the same freezer.experiment I used the same freezer.

The variables are the different The variables are the different volumes that I used and they were volumes that I used and they were 4oz and 8oz.4oz and 8oz.

Observations

• One observation I made is that the 4oz cooled faster than the 8oz.

• Another observation that I made is that once they got started they slowed down a bit.

• I also noticed that the 4oz got ice crystals faster than the 8oz did.

• Also, I observed that after the 4oz started to slow the 8oz started to gain.

DataData

4oz of water4oz of water 8oz of water8oz of water

30min ice crystals form30min ice crystals form 30min no crystals form30min no crystals form

45min more crystals45min more crystals 45min no crystals45min no crystals

60min crystals thicken60min crystals thicken 60min no crystals60min no crystals

1:10min thickening crystals1:10min thickening crystals 1:10min ice crystals form1:10min ice crystals form

1:50min thickening crystals1:50min thickening crystals 1:50min thickening crystals1:50min thickening crystals

2:35min thickens2:35min thickens 2:35min thickens2:35min thickens



3:35min frozen3:35min frozen 4:50min frozen4:50min frozen

Analysis of data

My data is accurate but I was off because my freezer was set for 20 degrees instead of 32 degrees.

I think my numbers would have changed if it was at 32 degrees.

My Hypothesis was correct because the lesser volume froze first.

What I would change in the experiment is change the temperature from 20 to 32 degrees.

A new question that I have is what is the effect of other liquids at a certain temperature.

References

http://www.answerbag.com/q_view/111892 (September 2009)

http://wiki.answers.com/Q/Why_does_water_freeze_at_32_degrees_Fahrenheit (September 2009)

http://www.ehow.com/how-does_4600114_water-freeze.html (September 2009)

Day.T (2007) Water

Taylor.B (2008) Understanding Landformes