Specific heat and latent heat use the table and equations to solve the problems below. We can use the table table 1 above and the equations below to calculate specific latent heat. Attached is a list of needed values to solve problems 1. Specific latent heat examples, solutions, videos, notes. In this process when a substance or body melts or evaporates, some heat is released or absorbed in the form of thermal energy during constant temperature is called latent heat. Phase changes and latent heat how much energy does it take to boil water. In my mixed ability group i gave the low ability students the silver worksheet and the high ability the gold worksheet and they peer marked which worked really well. Calculate the change in temperature of the aluminium. If you put a mercury thermometer into a container containing a mixture of cold water and ice, you will observe after moving downwards, the surface of the mercury stops moving. An exercise to practice latent heat calculations energy required to change phase course is based on the next texbook. In addition, latent heat storage has the capacity to store heat of fusion at a constant or nearconstant temperature that corresponds to the phase transition temperature of the phase.
The appropriate term to consider is now latent heat. Latent heat is associated with processes other than changes among the solid, liquid, and vapour phases of a single substance. This is a gcse worksheet from flipped around physics, on specific latent heat. A sample of ethylene glycol was heated on an element that was set to 80% the power that was used to heat a 1. The energy required to go from liquid phase to gaseous form is. Total gain the combined total of the sensible and latent gain. Specific latent heat calculations teaching resources. Explain your answer by drawing a heatingcooling curve for water. It has students classify certain words such as boil and condense as relating to latent heat of fusion or latent heat of vaporization.
How much energy is needed to heat a 125 g sample of water from 20 c to 100 c. Determine the latent heat of 5kg substance if the amount of heat for a phase change is 300 k. Some of the worksheets displayed are latent heat and specific heat capacity, phase changes and latent heat, name per work introduction to specific heat capacities, physics 06 05 phase change and latent heat name phase change, chemistry latent heat of phase change problems 2011, whole house heat loss. Estimates of the latent heat of vaporization of a pure liquid at any temperature from the known value at a single temperature is derived from riedels equation by watson. In this worksheet, we will practice using the formula e ml to calculate the amount of energy absorbed or released by a change in the state of a material.
Many solids exist in different crystalline modifications, and the transitions between these generally involve absorption or evolution of latent heat. Why does the temperature of h 2 o not increase when it is boiling. Indiana chemistry standards resource, november 2003 substance cp jgc water l 4. Latent heat by i heart physics teachers pay teachers. Calculate the final temperature of the system if 2209 kj of energy is added by heat. If we think about substances at a molecular level, gaseous molecules have more vibration than. Worksheets are latent heat and specific heat capacity, phase changes and latent heat, name per work introduction to specific heat capacities, physics 06 05 phase change and latent heat name phase change, chemistry latent heat of phase change problems 2011, whole house heat loss gain work, name, problems. Latent heat is the heat energy per mass unit required for a phase change to occur.
The heat thermal energy required for an objects phase transition is. Water is a very effective cooling agent because of its high specific heat and high latent heat of vaporisation. Specific heat capacity and specific latent heat specification references. Lastly, the specfic latent heat of vapourization lv is the thermal energy required for 1kg of the substance to boil or condense. Latent heat formula definition, formulas and solved examples.
The latent heat of vaporization is the energy required to give molecules sufficient kinetic energy to break the intermolecular bonds that keep molecules relatively. If a heat pump in a very cold climate heating is primary concern. A 5 kg mass of copper at 600 k is placed in contact with 5 g of copper at 300 k. Both latent heat of vaporisation and latent heat of fusion. If 100g of hot water, at 90c is added, what will be the. Latent heat is an important concept to know in the study of phase changes, and this quizworksheet will help you test your understanding of it as well as related. The latent heat of vaporisation is the amount of heat required to change 1 kg of a substance from a liquid to a gas or vapour. It varies with the type of material and the nature of the phase transition. Manual 3 latent gain the gains due to moisture in the air. Ethylene glycol has half the specific heat capacity of water. Then it tasks students with calculating heat using a table o. Specific latent heat calculation practice for gcse.
Nawaf althawab access code located on the lid of your lab kit. Latent heat of vaporisation of water 2260 kjkg ospecific heat of steam 2. In the chart in figure 2 notice that temperature is plotted on the left margin, and heat content is plotted along the bottom of the chart. 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. Calculate the latent heat of fusion l for each of the three trials you performed. How much energy does it take to boil a 125 g sample of water. The amount of heat energy absorbed or released for a phase change is known as latent heat. If not reduce equipment size does the sensible andor latent capacities of the selected equipment meet the loads requirements.
Worksheets are latent heat and specific heat capacity, phase changes and latent heat, name per work introduction to specific heat capacities, whole house heat loss gain work, calculations for temperature and phase change work, residential hvac work, hvac right sizing part 1 calculating. Worksheet answers are available from the worksheet is designed to be used in a flipped learning setting. So the specific latent heat of fusion lf is the thermal energy needed to cause 1kg of a substance to melt or freeze. Assume that the energy lost by the warm water is gained by the ice, but notice that the energy is used. Worksheets are latent heat and specific heat capacity, phase changes and latent heat, name per work introduction to specific heat capacities, physics 06 05 phase change and latent heat name phase change, chemistry latent heat of phase change problems 2011, whole house heat loss gain work, name, problems of specific and latent heat. People, cooking, plants, bathing and laundry washing can all add to the latent load in a home. The amount of heat required to change the state of unit mass of a solid to liquid at constant temperature at its melting point or vice versa is known as latent heat capacity of fusion or solidification.
Calculate the energy taking place when a substance changes state. It covers rearranging and using the equation for specific latent heat. Latent heat energy storage is a nearisothermal process that can provide significantly high storage density with smaller temperature swings in comparison with sensible storage systems. Latent heat, specific heat capacity and heat energy conversion. In order to melt one gram of ice into liquid water at 0 c, 334 j of heat must be absorbed, or in order to freeze 1 g of liquid water into ice at 0 c 334 j of heat must be released. Specific latent heat describe what is meant by specific latent heat of fusion and specific latent heat of vaporisation. Mercurys surface stops moving after reaching the temperature of the freezing point of the water 0 o c. Displaying all worksheets related to latent heat calculations.
Lab 8 latent heat and specific heat phy250l student name. The units of latent heat of fusion are j kg joules per kilogram. Latent heat definition, types, formula, fusion and vaporization. Heat to raise temperature of water from 20oc to 100oc x 4. How much energy does it take to heat 125 g of steam from 100 c to 110 c. Showing top 8 worksheets in the category latent heat. Physics 0608 the 1st law of thermodynamics and simple processes. Latent heat and enthalpy in this section we will develop the relationship between latent heat and enthalpy. Answers are provided at the end of the worksheet without units. Latent heat calculations worksheets lesson worksheets. Students know how to solve problems involving heat flow and temperature changes, using known values of specific heat and latent heat of phase change.
Latent heat in simple terms is defined as the energy that is required by a substance to either freeze, melt or boil. Chemistry latent heat of phase change problems 2011. More heat is required to change water to steam than to raise its temperature to boiling point. Physics 0609 the 2nd law of thermodynamics and heat. This worksheet introduces students to the idea of latent heat and how it is used in calculations. The process of dissolving one substance in another often involves heat. Large latent load are typically from moisture migration into the home from outside in humid climates. C qmat, where q heat energy, m mass, and t temperature remember, at tfinal tinitial. The following diagram shows the formula for specific latent heat. Example estimate the latent heat of vaporization for water at 300 c, given that its latent heat of vaporization at 100 c is 2257 jg 1 1 373. For a transition from solid to liquid, l is known as the latent heat of fusion, l. Latent heat as we have noted, you can transfer energy by heating without increasing temperature. Scroll down the page for more examples and solutions on how to use the formula. Latent heat definition, examples, unit, latent heat formula.
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