What is the nature of ice?
Ice, solid substance produced by the freezing of water vapour or liquid water. At temperatures below 0 °C (32 °F), water vapour develops into frost at ground level and snowflakes (each of which consists of a single ice crystal) in clouds. Below the same temperature, liquid water forms a solid, as, for example, river ice, sea ice, hail, ...
What is the chemical formula of ice?
A: Ice is the solid form of water that is created when water freezes at a temperature of zero degrees Celsius, so it has the same chemical formula of water, which is H2O.
What is the latent heat of fusion of ice?
The latent heat of fusion or melting of ice of mass 1kg is 336000J . This means that 1kg ice requires 336000J of heat to change to water without any change in the temperature. This in turn happens because the heat energy absorbed brings about change in the potential energy of the atoms and not the average kinetic energy .
Is ice a solid liquid or gas at different temperatures?
Below the same temperature, liquid water forms a solid, as, for example, river ice, sea ice, hail, and ice produced commercially or in household refrigerators. Ice occurs on Earth ’s continents and surface waters in a variety of forms. Most notable are the continental glaciers (ice sheets) that cover much of Antarctica and Greenland.
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How do you calculate LF of ice?
Find the latent heat of fusion, Lf, according to Lf = q ÷ m by dividing the heat, q, absorbed by the ice, as determined in step 3, by the mass of ice, m, determined in step 4. In this case, Lf = q / m = 2293 J ÷ 7.0 g = 328 J/g.
What is the LF of water?
Note: The latent heat of water at 0 degree Celsius for fusion is nearest to 334 joules per gram or 79.7 calories per gram. On the other hand, the latent heat of water at 1000C for vaporization is approximately 2230 joules per gram or 533 calories per gram.
What is the heat fusion of ice?
333.5 INTERNATIONAL JOULES PER GRAM333.5 INTERNATIONAL JOULES PER GRAM with an estimated uncertainty of 0.2 into j/g. The heat of fusion of ice was determined at the National Bureau of Standards about twenty-five years ago [1, 2]1.
What is the LF in physics?
Answer and Explanation: Lf in physical chemistry means latent heat of fusion. It is the amount of heat energy it takes to make 1 kilogram of a solid completely liquid at constant pressure. The units used are joules per kilogram.
What is the LV of steam?
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What is the specific heat of ice?
2.108 kJ/kgKThe specific heat capacity, or the amount of heat needed to raise the temperature of a specific substance in a specific form one degree Celsius, for water is 4.187 kJ/kgK, for ice 2.108 kJ/kgK, and for water vapor (steam) 1.996 kJ/kgK.
What is heat of fusion of water?
The heat of fusion for water at 0 °C is approximately 334 joules (79.7 calories) per gram, and the heat of vaporization at 100 °C is about 2,230 joules (533 calories) per gram.
What is the melting point of ice?
The melting point of pure water ice is 32°F (0°C).
How much is latent heat of fusion of ice?
334 kJ kg-1For ice, the latent heat of fusion is 334 kJ kg-1. This means that 334 kJ of heat is required to convert 1 kg of ice at 0 ° C into 1 kg of water at 0 ° C. Q.
What is LF in Q MLF?
where Q is the amount of heat absorbed by the solid, M is the mass of the solid that was melted and Lf is the latent heat of fusion for the type of material that was melted, which is measured in J/kg, NOTE: to fuse means to melt.
What is LF in entropy?
Lf is the heat energy required to change. 1kg of a solid (at melting point) into 1kg of liquid (at freezing point).
What is LF in calorimetry?
latent heat of fusion, Lf. If the substance changes from solid to liquid, and then the liquid undergoes a. temperature change, the total amount of energy involved is the sum of the thermal energy for the phase change and the thermal energy for the temperature change.
What is the heat of fusion of ice in kJ mol?
6.01 kJEvery substance has a unique value for its molar heat of fusion, depending on the amount of energy required to disrupt the intermolecular forces present in the solid. When 1 mol of ice at 0°C is converted to 1 mol of liquid water at 0°C, 6.01 kJ of heat are absorbed from the surroundings.
What happens when you heat ice?
A block of ice is solid water. When heat (a form of energy) is added, the ice melts into liquid water. It has reached its melting point – 0°C. Continue to apply heat, and the water will turn into water vapour, which is water in its gaseous state.
Is fusion freezing or melting?
Fusion is used for freezing as well as for melting. Freezing means change of liquid to solid at fixed temperature, and melting is nothing but change of solid to liquid at fixed temperature. The word "Fusion" is used for both the processes i.e. for melting as well as freezing. Q.
What is the heat of solidification?
noun Physics. the heat liberated by a unit mass of liquid at its freezing point as it solidifies: equal to the heat of fusion.
Where does ice occur?
Ice occurs on Earth ’s continents and surface waters in a variety of forms. Most notable are the continental glaciers (ice sheets) that cover much of Antarctica and Greenland. Smaller masses of perennial ice called ice caps occupy parts of Arctic Canada and other high-latitude regions, and mountain glaciers occur in more restricted areas, ...
What is ice made of?
ice, solid substance produced by the freezing of water vapour or liquid water. At temperatures below 0 °C (32 °F), water vapour develops into frost at ground level and snowflakes (each of which consists of a single ice crystal) in clouds. Below the same temperature, liquid water forms a solid, as, for example, river ice, sea ice, hail, ...
What are the two legs of a water molecule?
The two legs in which the hydrogen nuclei are present are called bonding orbitals. Opposite the bonding orbitals and directed to the opposite corners of the tetrahedron are two legs of negative electrical charge. Known as the lone-pair orbitals, these are the keys to water’s peculiar behaviour, in that they attract the hydrogen nuclei of adjacent water molecules to form what are called hydrogen bonds. These bonds are not especially strong, but, because they orient the water molecules into a specific configuration, they significantly affect the properties of water in its solid, liquid, and gaseous states.
What temperature does seawater freeze?
Ice is the solid state of water, a normally liquid substance that freezes to the solid state at temperatures of 0 °C (32 °F) or lower and expands to the gaseous state at temperatures of 100 °C (212 °F) or higher.
What is the term for the formation of ice sheets in the ocean?
The freezing of seawater in these regions results in the formation of sheets of sea ice known as pack ice .
Why does ice float in winter?
It is the reason why ice floats rather than sinking, so that, during the winter, it develops as a sheet on the surface of lakes and rivers rather than sinking below the surface and accumulating from the bottom. As water is warmed from the freezing point of 0 to 4 °C (from 32 to 39 °F), it contracts and becomes denser.
Is ice a solid or liquid?
Below the same temperature, liquid water forms a solid, as, for example, river ice, sea ice, hail, and ice produced commercially or in household refrigerators. An iceberg in the waters off Greenland. Ice cubes. Individual snowflake on the threads of a wool coat. Ice occurs on Earth ’s continents and surface waters in a variety of forms.
What are the properties of ice?
The properties of ice vary substantially with temperature, purity and other factors. Ice is water frozen into a solid state. Depending on the presence of impurities such as particles of soil or bubbles of air, it can appear transparent or a more or less opaque bluish-white color.
How is ice deposited?
It may also be deposited directly by water vapor, as happens in the formation of frost. The transition from ice to water is melting and from ice directly to water vapor is sublimation . Ice is used in a variety of ways, including for cooling, for winter sports, and ice sculpting .
How are water and ice controlled?
However, many of the physical properties of water and ice are controlled by the formation of hydrogen bonds between adjacent oxygen and hydrogen atoms; while it is a weak bond, it is nonetheless critical in controlling the structure of both water and ice.
What happens to the temperature of ice during melting?
During the melting process, the temperature remains constant at 0 °C. While melting, any energy added breaks the hydrogen bonds between ice (water) molecules. Energy becomes available to increase the thermal energy (temperature) only after enough hydrogen bonds are broken that the ice can be considered liquid water.
Why do windows get ice crystals?
This usually happens when a vehicle has been left alone after being driven for a while, but can happen while driving, if the outside temperature is low enough. Moisture from the driver's breath is the source of water for the crystals. It is troublesome to remove this form of ice, so people often open their windows slightly when the vehicle is parked in order to let the moisture dissipate, and it is now common for cars to have rear-window defrosters to solve the problem. A similar problem can happen in homes, which is one reason why many colder regions require double-pane windows for insulation.
What is the difference between liquid and solid water?
An unusual property of water is that its solid form—ice frozen at atmospheric pressure—is approximately 8.3% less dense than its liquid form ; this is equivalent to a volumetric expansion of 9%. The density of ice is 0.9167 –0.9168 g/cm 3 at 0 °C and standard atmospheric pressure (101,325 Pa), whereas water has a density of 0.9998 –0.999863 g/cm 3 at the same temperature and pressure. Liquid water is densest, essentially 1.00 g/cm 3, at 4 °C and begins to lose its density as the water molecules begin to form the hexagonal crystals of ice as the freezing point is reached. This is due to hydrogen bonding dominating the intermolecular forces, which results in a packing of molecules less compact in the solid. Density of ice increases slightly with decreasing temperature and has a value of 0.9340 g/cm 3 at −180 °C (93 K).
Why is ice on the road dangerous?
Whenever there is freezing rain or snow which occurs at a temperature near the melting point , it is common for ice to build up on the windows of vehicles. Driving safely requires the removal of the ice build-up. Ice scrapers are tools designed to break the ice free and clear the windows, though removing the ice can be a long and laborious process.
How many batches of craft ice per day?
Bring one of the hottest beverage trends home with the Craft Ice™ maker that automatically makes batches of three or six slow-melting Craft Ice™ per day. No more messing with expensive and time-consuming molds. Open up a new world of high-end drinks and keep soft drinks, lemonade and iced coffee tasting their best.
Does LG InstaView have ice maker?
Elevate your cocktails – and all your favorite beverages – with the LG InstaView™ Door-in-Door® with Craft Ice™ refrigerator. With an integrated ice sphere maker, plus the option to use crushed or cubed ice any time you please, you can make drinks that are perfectly chilled and never watered down. Discover our newest Craft Ice™ refrigerators, as well as our complete range of kitchen appliances – and find new ways to make life good.
Uldra I
I've been trying to figure out whether LF is systematically trying kill off every single one of the Starks, or if he really is trying to help Sansa take back Winterfell and avenge the RW.
Red Tiger
Taylor Swift (poster, not the nutjob) predicted that Varys kills LF in King's Landing, considering this is D&D we're talking about, I could very well see it happening.
midi
Taylor Swift (poster, not the nutjob) predicted that Varys kills LF in King's Landing, considering this is D&D we're talking about, I could very well see it happening.
Red Tiger
I dunno man, LF's whole shtick in the series seems to be becoming more powerful with each chapter. After basically becoming the ruler of the Vale and becoming Hand, what is next? Good time as any to whack him.
The Reckoner
LF is doing what LF wants. Like Varys said - LF is the only person LF cares about. I did like seeing him gotten the better of by Roose Bolton.
The Reckoner
I'm thinking the same - LF in that Varys scene, except with Olenna instead of Varys. She was complicit in Joffrey's poisoning. Someone with as many irons in the fire as LF can't have loose ends running around.
atheron70
Very interesting the idea of Littlefinger becoming Hand of the King and taking Kevan's place. However, the issue I have with that is if Cersei is actually THAT stupid (i know i know maybe she is). Think of it like this, though. With Kevan as hand of the king, she at least has the familial ties.
