Freezing Essays

Introduction: Certain species of fish are able to survive freezing temperatures in water by lowering the freezing point of water in their bodies by increasing the concentration of the dissolved solutes in their blood plasma and their tissues. Freezing point is a colligative property. The experiment provides students with experience to learn how to find the molecular weight of a solute by using their freezing point. Materials and Methods: The experiment began by gathering the materials. The materials

lab, the freezing point depression of water, enthalpy of dissolution, cost, and environmental impact will be discussed. A large factor in how effective a substance is as a deicer is it’s ability to decrease the freezing point of water. If the freezing point of water can be lowered, the outside temperature must be much colder to reach this new freezing point, resulting in less ice on the roads. These results a somewhat inaccurate due to the fact that when the solutions were actually freezing is difficult

Egg Freezing (scientifically known as human ocyte cryopreservation) is a process in which a woman's eggs (oocytes) are extracted, frozen and stored. In the future, the eggs can be thawed, fertilized, and transferred to the uterus as embryos. In simpler language, egg freezing is the freezing of fertility for future. Cryopreservation although is not new. Since the 1950’s, human sperm has been frozen and stored, and since the 1980’s, human embryos have been cryopreserved. Both sperm and embryo freezing

bodies react by dumping loads of adrenaline into our bloodstream. Our heart beats faster as it pumps more blood into our muscles preparing us for “fight or flight”. In this situation, most people freeze and are not sure what to say or do beyond that. Freezing is a natural

It was May 20, 1944, a fourteen-year old entered the concentration camp of Auschwitz-Birkenau. The teenager and the other arrivals that could walk went to the concentration camp on foot. Those who did not cooperate with the Nazis were immediately gunned down. The people who made it to the camp went two days without food. Slowly, this consumed several of the prisoners as they changed from good-willed humans to ravenous savages. Beating other prisoners or betraying them to the Nazis in order save

Freezing Point Depression Purpose: The purpose of this experiment is to determine the freezing point depression of ice by making ice cream. Safety Precaution: Allergy precaution! Do not touch or eat if allergic to dairy or lactose intolerant. Materials: • ½ cup of milk • ½ cup of whipping cream/ heavy cream • ¼ cup sugar • ¼ teaspoon vanilla or vanilla flavoring • ½ to ¾ cup of sodium chloride • 2 cups of ice • 1- quart Ziploc bag • 1- gallon Ziploc bag • Measuring cups • Spoons • Cups

Below freezing temperatures, poison rushing through your veins, getting tortured just because your sibling looks exactly like you. Sitting in a room with no way out, because you know there are guards that would be more than happy to kill you waiting outside. Or being strapped to a table knowing that you probably going to die, and not being able to do anything about it. There are three words for how terrible the holocaust was; freezing, poison, and twin’s experiments. Many people were brought in alive

The phenomenon of freezing point depression has many practical uses. The radiator fluid in an automobile is a mixture of water and ethylene glycol (antifreeze). As a result of freezing point depression, radiators do not freeze in winter (unless it is extremely cold, e.g. −30 to −40 °C (−22 to −40 °F)). Road salting takes advantage of this effect to lower the freezing point of the ice it is placed on. Lowering the freezing point allows the street ice to melt at lower temperatures, preventing the accumulation

Discussion: In this experiment, freezing point depression was used to determine the molar mass of three unknown solids. First, the freezing point of the mixture of ice and water was determined, as freezing occurs when both the solid and liquid phases pre-present together. The temperature when the ice and water mixture reached equilibrium was recorded. Then, the solution of the unknown solids was prepared and its freezing point was determined. Then the equation of molarity allowed the experimenters

Introduction: Freezing point depression is a colligative property that calculates the decrease of the freezing point when any solute is added to a solvent. When determining changes in freezing point, solute concentration is measured in molality which is moles of solute per kilogram of solvent. The concentration unit moles per kilogram is temperature independent, because mass does not vary with temperature. The decrease in freezing point of the pure solvent is proportional to the molality of the

Polar bears have a thick layer of fat called blubber which is about 11 cm thick. This also helps the bears to survive in the freezing conditions. Not only on land, but the thick layer of fur coat and blubber helps them as they spend a great amount of time swimming in the freezing waters of the Arctic. Blubber is a thick layer of fat that helps prevent sea mammals from getting too cold. Blubber in depth, is an extra digested food stored in the form of adipose tissue, which contains molecules called

80°F And Freezing Cold weather is the main cause of hypothermia. When hitting the road or doing any traveling or activity in the winter, no one ever really thinks to be ready for the worst-case possible scenarios. One should always bear in mind the consequences of being caught out in the middle of a blizzard or faced with a snowy cold front with none of the right equipment or proper attire. Peter Stark’s essay “As Freezing Persons Recollect the Snow” positions the reader into the driver’s seat of

from re-freezing. It does this by getting in the way of the hydrogen bonds that help to make ice form. Salt is made of sodium and chloride. When it dissolves in water, it breaks apart. The sodium (which has a positive charge) is attracted to the oxygen part of the water molecule and the chloride (which has a negative charge) is attracted to the hydrogen part of the water molecule. This prevents hydrogen bonding so it prevents re-freezing. Since more water is melting and less is re-freezing, more

variables that all lower the freezing point of water. Ice is used as the controlled variable because it is what the salts are lowering the freezing point of. Salt (Na) weakens intermolecular forces of water, thus lowering the the freezing point. This is why in colder climates where icy roads and walkways are a liability, salt is often scattered over areas that are slick with frozen water. Ions (particles with a positive charge) are very effective at lowering the freezing point of water because they

such as homosexuals, Jews, and Soviet prisoners as test subjects for our experiments. The experiments are going to be conducted under the supervision of Dr. Sigmund Rascher at the camps of Dachau, Birkenau, and Auschwitz. Medical Report #2: Freezing Experiment (1) We are currently conducting this experiment in order to see what conditions soldiers experienced while on the Eastern Front. Thousands of Germans have died from hypothermia.

Self-Design Lab Rubric Name(s): Cassidy Gale Redding TITLE: The Affect Different Liquids have on Dry Ice’s CO2 Release I. DESIGN: How long does it take a piece of dry ice to sublimate in different liquids? Background Theory: Dry ice is the solid form of CO2, therefore it sublimates instead of melts. Sublimation is a solid turning into a gas instead of a liquid. When placed in water, dry ice reacts by sublimating faster because of

BS1003 – Organic Chemistry Practical 1 Laboratory Report Name: Tristan Chan Yew Kit, U1640436J (T8) Effects of Dichloromethane(DCM) in Extraction of Caffeine from Tea Leaves Purpose To investigate the ability for Dichloromethane(DCM), a moderately polar organic solvent, to extract aqueous caffeine molecules, originating from Tea Leaves suspended in water. Introduction Caffeine, defined chemically as 1,3,7-trimethylxanthine (C8H10N4O2), is an alkaloid that can be found in tea leaves, coffee and many

The purpose of my experiment was to determine how the amount of salt affects the freezing point of water. My hypothesis was if I increase the amount of salt distributed in cups of water, then the freezing point of the water will decrease because salt dissolves in water while taking up volume simultaneously, which prevents water molecules from packing together and freezing. I tested my hypothesis by filling 16 nine ounce plastic cups with six ounces of water each. I then added one teaspoon of salt

Purpose: The purpose of this experiment was to determine the molar mass of unknown #43 using the derived freezing point depression. To obtain the freezing point depression, t-butyl alcohol was placed in a cold-water bath and frozen solid for a total of two runs. Then, unknown #43 was dissolved in t-butyl alcohol and placed in a cold-water bath until frozen solid. This process was repeated for a total of three runs, with the first two runs containing half of the unknown, and the last run containing

molecular weight 1. Aims To determine the apparent molecular weight of benzoic acid in cyclohexane by creating a binary system and finding the different freezing points of the solutions. 3. Experimental Procedure A dry, empty freezing-point tube and its cork were weighed together. Carefully, 15-20g of pre-cooled cyclohexane was poured into the freezing-point tube, the tube recorked, and the whole thing was reweighed, to find the exact mass of the cyclohexane. The dry thermistor and stirrer were inserted