Freezing Definition and 161 Threads

A quick google search reveals conflicting opinions on whether or not this will have a negative impact on battery life. I carry my laptop outdoors with me every day on my walk from the train to the hospital, do I need to worry about the cold ruining my battery?

Homework Statement The enthalpy of fusion of mercury is 2.292 kJ/mol, and its normal freezing point is 234.3 K with a change in molar volume of +0.517 cm/mol on melting. At what temperature will the bottom of a column of mercury (density 13.6 g /cm3) of height 10.0 m be expected to freeze...

It is very hard to have homogeneous nucleation in common situation. Pure water with no nuclei at all will not freeze above -40oC. The presence of impurity particles allow the so-called heterogeneous nucleation to occur so that we can see water freeze at 0oC. It may be reasonable to guess at what...

Homework Statement You have a 10.4g mixture of sugar (C12H22O11) and table salt (NaCl). When this mixture is dissolved in 150g of water the freezing point is found to be –2.24 degrees centigrade. Calculate the percent by mass of sugar in the original mixture. Homework Equations delta...

Homework Statement Water in rock crevices often causes erosion when it freezes, given it expands and exerts pressure on the rock. What is the maximum pressure that water can exert when it freezes? T = 263.15 K dice @ 263.15 K = 0.9 g cm3 dwater @ 263.15 K = 1.0 g cm3 Homework Equations...

Homework Statement A 100 g mass of supercooled water at -2ºC in thermal contact with surroundings also at -2ºC freezes spontaneously. Calculate the entropy change of the universe assuming that the surroundings act as a large temperature reservoir. [The specific heat capacity of ice is 2090 J...

So we need a new picture and the weather is freezing fog. Hence rime ice time. The bigger waters are still open, the fog is more intense there, the place to go for new rime ice pictures. 100% crop 100% crop Now, which one to enter in the contest?

freezing Beer in the Heat! Hey everybody!... the other day i had a few Beers in the refrigirator...i went to get one and i grab one...it was liquid...it wasnt frozen as the others...then when i open it up...it started to frozen from top to botton continuosly!...it took like 15 seconds to do...

Why is the vapour pressure lowered when non volatile solute is added to a solvent? What is the physical reason? Also, why do binary solutions freeze over a range of temperatures, not at one specific temperature? Thanks guys, as usual, for sharing the knowledge!:smile:

Homework Statement No data Homework Equations No equations. Theory The Attempt at a Solution Freezing the soda can will makes the soda can contract, thus increasing the pressure of the soda. P=F/a. However, as pressure had increase, to the air particles in the soda can will have...

1. The diagram shows a strip of paper tape that has been pulled under a vibrating arm by an object moving at constant speed. The arm is vibrating regularly, making 50 dots per second. What was the speed of the object? A. 2.0cm/s B. 5.0cm/s C. 100cm/s D. 200cm/s Completely clueless...

Homework Statement One mole of two different compounds happens to weight the same, but one compound ionizes in water and the other does not. Which will give the lowest freezing point depression? Homework Equations The Attempt at a Solution

Homework Statement 1.Antifreeze used in your car is ethylene glycol, HO-CH2-CH2-OH. It is usually diluted 1:1. Assume that you made a solution of 50 g of water (solvent) and 50 g of ethylene glycol (solute). What temperature in Celsius would your car be protected to in cold weather? Assume...

If you did had a container that was strong enough to resist the expansive forces generated as the water in it freezes, what would happen? (assuming the container is filled completely with water) Thanks for any answers in advance, and I hope this post is in the correct place, if not, then sorry!

Hey I have to do some spectroscopy of whole blood. But I can only get freezed blood. Is freezed blood different from 20 degree blood. Any chemical differences? does freezing destroy elements of blood. regards MB

Hello, Iv'e freezed a bottle of water, which was feeled up to the top, with no room for air. After I took it out of the freezer I of course licked the ice, and it taseted like salt (not very pleasent)! Is it salt? If you freeze ice in a bottle which does have some space for air this doesn't...

Have they identified the genes behind frogs being able to produce antifreeze and surviving freezing themselves that way? Can anyone shed more light on frogs freezing themselves? thanks

check it out: or this one: & this CBC report: http://www.cbc.ca/clips/mov/jones-cold080129.mov :bugeye: Luckily for people who don't like the cold it will warm up a bit by the weekend. I like it the way it is though. :approve:

i was just wondering why salt, when it dissociates into Na an Cl as it is dissolved into water, decreases the freezing point of water. Why does more energy have to be taken out of the system? does it have to do with entropy or what?

i found this in a textbook. at a high altitude the temperature of the atmosphere is 500 degrees centigrade. yet an animal there would freeze to death and not boil. why does this happen?

Homework Statement Calculate the freezing point and boiling point of each of the following solutions using the observed van't Hoff factors in Table 11.6. (a) 0.070 m MgCl2 Temp Freezing? Temp Boiling? (b) 0.020 m FeCl3 Temp Freezing? Temp Boiling? Homework Equations...

Why is the triple point of water .01C while the freezing point 0C? It seems contradictory.

Homework Statement Ethylene glycol, the primary ingredient in antifreeze, has the chemical formula C_2H_6O_2. The radiator fluid used in most cars is a half-and-half mixture of water and antifreeze. What is the freezing point of radiator fluid that is 50% antifreeze by mass? K_f for water...

Is it possible for water on the surface of a road to freeze even though the temperature of the air just above the road is above 0 degree Celcius? I think the answer is yes but i do not have any theories to support it. It may be because the air above is is above 0 degrees so it tends to rise...

http://www.collegehumor.com/video:1755006 This may be old but... How does this work? They need to have a huge warmth transfer coefficient for this to happen? Maybe the water is at 0°C already and a small amount of energy should be taken to get this effect. Is it electromagnetical or is the...

My girlfriend's computer is incessantly freezing, or when it does function it will freeze the minute you go idle for about 20 minutes. It's irking her and I was wondering what the cause of this is and how to fix it? She has a Windows XP operating system.

I don't pay my electricity bill so if I build a sterling engine going out into the -40 degree weather...

I have a Gallon of water at room temperature at Sea Level. I want that gallon completely frozen in 5 seconds. Supposing you don't account for impurities (ie. it's pure water)... 1) Is this possible? 2) How cold would it have to be? Let's say you add 50% salt... 1) Is this...

Assume that the density of water is 1.00 g/ml . Calculate the quantity of KBr that would need to be added to lower the freezing point of 535 ml of water by 1.40 degree celsius: What I'm trying to do is the following: [SIZE="4"]Step 1: [SIZE="3"]Tf = [SIZE="3"]Kf . m I took Tf = 1.4...

Hi Guys, I have a question and its regarding to the freezing point depression lab ... I did an experiment where I had to find an "i" value for KCl. I'm getting 2.4 for "i" ... but the theoratical value is 2. I was just wondering why expriment value os higher than the theortical value ? what...

i have a computer that alwaysd worked fine but now when i enter certain folders the whole computer freezes and then everythign restarts?

So we did an experiment of freezing point depression and my calculated molar mass values were larger than actual... First, the freezing point of the pure solvent had to be determined and so if some of the solvent was on the walls of the test tube opposed to in the solution how would this affect...

Almost every time I start up my computer, on the POST logo, it shows like colourful lines, when it goes to anything that has text in it such as the BIOS setup or anything like that, I have these weird characters and all this random stuff, such as the DOS text for smiley faces. It also will...

In "Frozen Light" an article written by Lene Vestegaard Hau, it talks about Lene's experiments with, literally, slowing down light by way of passing it through "ultra-cold clouds of atoms." The experiment was undertaken at Cambridge and Lene and a group of researchers were able to get light's...

Heyas. Recently my brother showed me a trick with a plastic bottle of very cold water. It was out of the freezer, pretty cold, but not frozen. He took the bottle and slammed it against the counter and the bottle froze up. I'm at a loss for explaining why this happens.. The only thing I can...

Water – Boiling and Freezing What started as a question has become my own answer. While waiting the 15 minutes or so for this site to send me my new authorization, I found my answers to… Many years ago I watched a science show hosted by a professor called Julius Sumner-Miller, who would...

The Mpemba effect is about the phenomena of hot water freezing faster than cold water. Does anyone know how to pronounce Mpemba?

When you make ice cream using a couple of zip loc bags and a salt/ice mixture do the room and surroundings have any effect? Can you be in a warm room and still make the ice cream? Thanks.

First please note that I have never taken a physics class in my life. The only reason that I have any clue whatsoever about what went on is because of SCUBA equipment and paintball markers. I have completed a brief search in the forums here and have not found a sutible answer. We have come...

Hi Its the holidays and i was just thinking if you have a jar with some water in it and you put it in a freezer say 0 degrees and the jar is constantly being shaken rapidly would the water freeze up over time? or simply if a body of water is moving does the freezing point decrease in...

http://en.wikipedia.org/wiki/Mpemba_effect This has been brought up in the past, but I did not know the effect had a name.

I got called into work today on my day off, and is was **** cold, it is freezing fog outside and a max of 10c inside, how can i keep my bits warm ?

What is the freezing point of radiator fluid that is 50% antifreeze by mass? for water is 1.86 . I used delta: K_fc_m First I found the molar mass of ethylene glycol to be 62.07 g/mol. Then I multiplied 1/62.06 by 500g/1 kg to get 8.06 mol/kg for cm. I plugged these values in and got 15 C...

The steam engine which operates between 500°C and 200°C is run in reverse. How long would it take to freeze a tray of a dozen 37 g compartments of liquid water at room temperature (20°C) into a dozen ice cubes at the freezing point, assuming that it takes 300 W of input electric power to run it...

im doing a science project on cryonics and preserving live tissues and simple live organisms. i am experimenting with finding ways to keep Earthworms alive for extended amounts of time(months even) in sub zero environments(-20°C or lower). it is a common fact that Earthworms can survive for a...

ethanol 46g/mol freezes at 3.65degC density changes from 0.789g/cm-3 to 0.801g/cm-3 latent hear of fusion 8.68kJ/mol. freezing point at 1000 atm. i calculated the ansfer from an example and just want to verify if its correct. dp/dt=(dfusH)/(t*dfusV) rearanged to dt=(dp*t*dfusV)/dfusH...

OK, I'm not a science person. I'm an elementary ed major and we have to take classes in physical science to get the basics. So, my problem is in plain English! This month, I have to do a 10 page research paper and presentation on "Boiling water and freezing it at the same time." Now...

if i have some of my unknown sample which remains unmelted and undissolved on the walls of the test tube, will this error cause the calculated molecular mass to be too high or too low? i've thought about this and my guess is that the molecular mass would be too high because the colligative...

I read about this, it seems diffferent from cryogenic freezing. I'd like to be frozen but revivable...what do you think about this. Do you think I could be frozen like this and revivable? (In a different way from cyrogenic freezing) Shallow Freezing: Using a blood-substitute containing an...

This is a physical intuition problem I don't quite understand fully. The question is, why doesn't Lake Tahoe freeze (the whole Lake)? I know the crystal structure for water breaks at 4 C and the volume is at its lowest point at that temperature. If the temperature above the water is...