The calculation of the specific latent heat of fusion of ice is as follows. The concept of latent heat of fusion of sea ice, l il t s is complicated by the internal melting and freezing that occur over a wide temperature range. Heat lost by water is equal to the mass times the specific latent heat of fusion and the equation is vtiml, m is mass of water in difference, t stands for the time taken for heat the ice and l is the latent heat of fusion of ice. Ice will be placed directly into a measured amount of water. Physics for dummies reports that latent heat is the heat needed to cause a change in phase per kilogram. On the latent heat of fusion of ice the journal of physical. By knowing the masses of the ice, the water, and the calorimeter, and the resulting temperature change after the ice melts, the latent heat of fusion of ice is found. Understand the idea of heat of transformation when ice undergoes a phase change. Advances in condensed matter nuclear science provides a concise description of the existing technological approaches in cold fusion or low energy nuclear reaction engineering.
Using these experimental data, students will calculate the heat of fusion of ice. Heat of fusion of ice introduction the concepts of phase changes and heat of fusion will be reinforced in this student lab activity. Purpose to determine the molar heat of fusion of ice. Heat of fusion 516 laying the foundation in physics 19 heat of fusion determining the heat of fusion of ice the heat of fusion is the quantity of heat needed to change one kilogram of a substance from the solid state to the liquid state at the normal melting point of the substance. The specific heat and heat of fusion of sea ice are generally defined according to the above equilibrium considerations, that is to say the heat required to raise the tem perature of sea ice from fi to ti is composed of the total sum of heat required to raise. Background the amount of energy required to convert a solid to a liquid, at constant pressure and temperature, is. Heat of fusion of ice lab 1 the heat of fusion of ice. Apr 26, 2009 homework statement determine the specific latent heat of fusion of ice given the amount of time it takes the ice to melt 150 seconds. Calculate the heat of fusion of ice in kjmol by dividing the heat transferred from the water by the moles of the ice melted.
The purpose of this experiment is to determine the latent heat fusion of ice. In the olden days people defined the concept of heat capacity because they thought that somehow an object could. These two phenomena thereforethe melting of ice and the beiling of. This physics video tutorial explains how to solve problems associated with the latent heat of fusion of ice and the latent heat of vaporization of ice. If the ice and salt are insulated from the surroundings, this heat can only come from the ice and salt itself, which causes a drop in the temperature. And in the case of water it doesnt require energy, melting is exothermic and freezing is endothermic. Osborne abstract the results of measurements of the heat of fusion of ice made at the national bureau of standards and published in 19 and 1915 have been revised by one of the original experimenters, usng more recent data for the heat capacity of water, which is involved in the calculations. Heats of fusion reference table chemistry libretexts. Heat of fusion of ice prelab utk department of physics. Use density arguments to verify the identity the of your metal sample. Insert table of heat of fusion, heat of vaporization of water, aluminum procedure.
Conclusion with the data obtained from the experiment, the specific heat of metals was computed without difficulty, using the equation q mc. Oct 01, 2006 specific latent heat of fusion of ice336000,specific heat capacity of ice2100 specific heat capacity of water4200. To calculate the heat that flows from the water, you can use the relationship. Determine a value for the specific latent heat of ice objective safety to determine the specific latent heat of ice by measuring the drop in temperature of water containing melting ice ice might need careful handling if it has just been removed from a freezer. The ice will be melted by placing it in a known volume of hot water contained in a plastic cup. Department of civil and transport engineering, marine civil engineering group, ntnu unis, arctic technology. Answer this question based on the following information.
This will change 1 pound of ice at 32 degrees f into water at 32 degrees f. The amount of energy required to convert a solid to a liquid, at constant pressure and temperature, is called the heat of fusion of the substance. Latent heat energy must be removed from substance example how much heat is released from 50g of water as it a changes from liquid to ice at 0oc. After conducting the experiment, the data we gathered was used to compute for the latent heat of fusion with the equation q m l f, q being the heat. The second part of the experiment involve determining the latent heat of fusion of ice.
The amount of heat needed to melt the solid depends upon both the amount and type of matter that is being melted. Find the corresponding temperature on the fahrenheit scale. This example problem demonstrates how to calculate the amount of energy required to melt a sample of water ice. The specific latent heat of fusion of ice is 33600 j kg1. It warms the water formed by the melting ice from zero to the final temperature. The needed energy will come from a cup of warm water. This book is composed of eight chapters, and begins with an introduction and in the fundamental aspects of ice, including pure water freezing, circulation, occurrence, classification, and importance of ice. A 2 kg block of ice is placed in a container at 0 c. How much energy is required to completely melt the block of ice. Homework equations q ml the attempt at a solution time 530w. Find the latent heat of fusion, lf, according to lf q. Csec physics answers to revision questions 1 scientific method 1. It is important for chemists to be able to measure these changes in heat.
Heat of fusion of ice lab name date heat of fusion of ice prelab discussion the heat of fusion hf is the amount of energy required to melt 1 g of a. Read the introduction to the heat of fusion of ice writeup in your lab manual p 85. Heat of fusion is the amount of heat energy required to change the state of matter of a substance from a solid to a liquid. Igcse thermal physics revision specific heat capacity. Download complete pdf book, the epub book or the kindle book. Latent heat of fusion mcqs quiz questions and answers online. Typical laboratory calorimeter cup courtesy of welch scientific co.
Latent heat of fusion introduction when a solid has reached its melting point, additional heating melts the solid without a temperature change. At what temperature t0 does the specific heat of the free. The answer is best represented to two significant figures i. What is the quantity of heat that is required to convert 4g of ice into steam at 100.
In this experiment, the heat of fusion of ice will be determined. Students will measure the temperature change when ice melts in water and then calculate the. At what temperature t0 does the specific heat of the free electrons become larger than the specific. Thermal physics is a key area of physics that deals with what happens when. The enthalpy of fusion of a substance, also known as latent heat of fusion is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure. Heat of fusion values differ for different materials. Thermal physics, ebook, 6 chapters, 34 pages lincoln central. Calculate the latent heat of fusion l for each of the three trials you performed.
Chemistry heat of fusion of ice jiskha homework help. A calorimeter with specific heat of 490x102jkg1k1 has a mass of 2. A small amount of ice is placed in a calorimeter containing water. By measuring the temperature change of the water, students can calculate the quantity of heat exchanged between the water and the ice. Theory when heat is added slowly to a chunk of ice that is initially at a temperature below the freezing point 0 c, it is found that the ice does not change to liquid water instantaneously when the temperature reaches the freezing point. Confusion like that is why latent heat of fusion is now referred to as enthalpy of fusion instead. From this equation you can calculate the specific latent heat of fusion of ice. Since a fundamental law of physics is that energy must be conserved, this latent heat of sublimation must. The energy required to melt the ice is removed from the warm water as it cools. The heat thermal energy required for an objects phase transition is. Although on the microscopic level all matter is made from atoms or molecules, everyday experience tells us that the three states have very different properties.
The two main types of latent heat are latent heat of fusion melting substance and latent heat of vaporisation boiling substance. Temperature and heat please remember to photocopy 4 pages onto one sheet by going a3a4 and using back to back on the photocopier. Its units are usually joules per gram jg or calories per gram calg. Latent heat of fusion mcq questions online pdf ebook download.
Assume that the energy lost by the warm water is gained by the ice, but notice that the energy is used. Experiment 4 heat of fusion and melting ice experiment in this lab, the heat of fusion for water will be determined by monitoring the temperature changes while a known mass of ice melts in a cup of water. Expression in terms of the latent heat if fusion of ice in. A time and temperature sign on a bank indicates the outdoor temperature is 20 0c. As mentioned in the opening paragraph, the most common application of the heat of fusion is the melting of ice to water. Chapter 12 determining the heat of fusion of ice 12. That means it takes 80 calories of energy to melt 1 gram of ice at 0 degrees c. Excess ice will be added to warm water, at a known temperature, in a styrofoam cup calorimeter. Apr 23, 20 i just finished a lab in chemistry were i melted ice in water, and in the lab report i have to calculate the heat of fusion of water from the data i collected and compare it to the actual heat of fusion. Experiment 4heat of fusion and melting ice experiment. In this experiment, an ice cube of mass mt, assumed to be at 0oc. The amount of heat required to convert one unit amount of substance from the solid phase to the liquid phase leaving the temperature of the system unaltered is known as the latent heat of fusion.
Specific latent heat of fusion of copper 207 000 jkg specific heat capacity and specific latent heat when water changes phase, thermal energy is exchanged between the water and. Theory when heat is added to a substance, a temperature change is generally observed to occur. The warm water will be cooled to temperature near 0 c by the ice. It handles the chemistry, physics, materials, and various processes involved in cold fusion, and provides a critical analysis of obtained theoretical and experimental results. School of physics, university of sydney, australia. Weigh the beaker and ice to determine the mass of ice added. You will then determine the molar heat of fusion for ice in kjmol. The heat required to melt the ice will be supplied by the water. We also acknowledge previous national science foundation support under grant numbers. The latent heat of sublimation at a particular temperature is the amount of heat required to convert a unit mass of solid into gas. Expression in terms of the latent heat if fusion of ice in melting at 0c plus raising the temperatur. Conclusion with the data obtained from the experiment the.
The aim of this book is to examine some of these properties and the underlying physics. Design an experiment to find out if an ice cube taken from a freezer and immediately placed into a calorimeter needs the same amount of energy per gram for melting as does an ice cube that has been outside. Use equation 2 and the data in the data section to solve for the latent heat of fusion lf. Joe khachan is an associate professor in the school of physics at the university of sydney, australia. Compare your experimental result to the accepted value of 333. Jan 11, 2017 i use pretend data and walk you through how to do the calculations for your heat of fusion of ice lab. The physics of ice covers the state of knowledge regarding the structure, properties, occurrence, and movement of ice. The latent heat of fusion for ice at 32 degrees f is 144 but per pound. Latent heat of fusion and vaporization, specific heat. Heat lost by water is equal to the mass times the specific latent heat of fusion and the equation is vtiml, m is mass of water in difference, t stands for the time taken for heat the ice and l is the latent heat of fusion. Formulation of the latent heat of fusion of ice in aqueous. During the process of melting, the solid and liquid phases of a pure substance are in equilibrium with each other.
In this experiment the heat of fusion of ice will be determined by using the method of mixtures quantity of heat lost quantity of heat gained. The heat of fusion process can be seen in countless applications and evidenced in the creation of many common household items. Heat capacity, specific heat, and heat of transformation book. An example of latent heat fusion is an ice cube at room temperature. To measure the specific latent heat of fusion of ice. Latent heat of fusion mcqs, latent heat of fusion quiz answers pdf to study secondary school physics for online certificate courses. Water, for example, has a heat of fusion of 80 calories per gram. His field of research is experimental plasma physics with a focus on the generation of clean and sustainable energy from the fusion of atomic nuclei in the plasma.
That is, the ice has a good chance of melting if it is not too cold. The temperature will remain constant at the melting point until all of the solid has melted. What assumption did we make about heat lost by the water in the calorimeter as compared to heat gained by the melting ice. International conference on low temperature science. In this experiment the heat of fusion of ice will be determined by using the method of mixtures quantity of heat lost quantity of heat. Latent heat is the amount of energy that is realised or absorbed by a substance in the form of heat when it is changing state. The amount of water and its temperature will be measured before adding some ice and then again after the ice has been melted. A total of 334 j of energy are required to melt 1 g of ice at 0c, which is called the latent heat of melting.
Heat of fusion of ice lab name date heat of fusion of ice. H f u s, also known as the heat of fusion or specific melting heat, is the amount of thermal energy which must be absorbed or evolved for 1 mole of a substance to change states from a. It is useful for some students to see a graph of the experiment, and one representation is given below. It varies with the type of material and the nature of the phase transition. Experiment 4 heat of fusion and melting ice experiment in this lab, the heat of fusion for water will be determined by monitoring the temperature changes while a known mass of ice. Title specific heat and heat of fusion of sea ice authors. The amount of heat necessary to melt sea ice is given by ono 1967. I professor of physics at the conservatoire des arts et metiers, pans. You do not need a full lab report, just answer the analysis questions and attach the lab handout. In this experiment you will try to measure the latent heat of fusion of ice lhice, the energy needed per gram to melt ice. Q x fin p ini here, x ini is the initial concentration of aqueous solution and p ini is the initial ipf, which is the mass fraction of ice in the icesolution mixture. As ice melts or liquid water evaporates, the molecules change state from a solid to. The mass of ice melted is the same as the increase in the volume of the water. Cheney, department of physics and astronomy, 401 nielsen physics building, the university of tennessee, knoxville, tennessee 379961200.
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