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[Title: Temperature of Mixed Water Objective: You will measure final temperature of mixed water at two different temperatures. Apparatus: beaker, Styrofoam cups, hot plate, thermometer,

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[Title: Temperature of Mixed Water Objective: You will measure final temperature of mixed water at two different temperatures. Apparatus: beaker, Styrofoam cups, hot plate, thermometer, graduated cylinder, disposable plastic dropper, triple beam balance, Background theory: Heat is energy transferred from one object to another due to a difference of temperature between the two objects. To predict final temperature of mixed water at two different temperature, use the following two equations. Qc=-On Heat entering to a cold object = - heat leaving from a hot object. Minus sign indicates that heat leaves from hot object. Q=mcAT AT: change in temperature (Tt Ti) Heat = mass (specific heat capacity)(change in temperature) Specific heat of water = 4.2]/gC Ex) 150g of water at 60C and 150g of water at 30C is mixed. What is the final temperature of mixed water? Heat entering cold object = - (heat leaving hot object) Qc=-On Q=mcAT Q=mcAT 150g(4.2)(Tf-30) = -150g(4.2)(Tf-60) Tf-30= - (Tf-60) 2Tf=30+60 = 90, 2Tf = 90 Tf= 45.CExperimental Method: You will predict final temperature after mixing water at two different temperatures. A: mixing equal amount of water at different temperatures. Measure 100g of water at 40C for hot water and 100g of water at room temperature for cold water. Calculate final temperature of mixed water. Mix hot and cold water to measure actual temperature with a digital thermometer. Calculate percent error of final temperatures after mixing hot and cold water. Fill out the following data tables where Tfcal: Predicted final temperature of mixed water, Tfexp: Measured final temperature of mixed water, and Ti: initial temperatze ~f wratar Editor. Check for Spelling, Grammar, and Writing Issues B: mixing unequal amount of water at different temperatures. B-1: Measure 200g of hot water at 40C and 100g of water at room temperature for cold water. Mix hot and cold water to measure actual temperature. Calculate percent error of final temperatures after mixing hot and cold water. B-2: Measure 200g of cold water at room temperature and 100g of hot water at 40C. Mix hot and cold water to measure actual temperature. Calculate percent error of final temperatures after mixing hot and cold water. Data: A) Mixing equal amount of water at different temperatures. Volume(ml) Mass(g) initial temp Ti(C) Hot water 100ml 100g 40 C=104 F Cold water 100ml 100g 22.7778 C = 73F Tfcal Tfexp % error= B) Mixing unequal amount of water at different temperatures. B-1: Volume(ml) Mass(g) initial temp Ti(C) Hot water 200ml 200g 40 C = 104F Cold water 100ml 100g 22.778 .C = 73F Tical Tfexp % error= B-2: Volume(ml) Mass(g) initial temp Ti(C) Hot water 100ml 100g 40 C = 104F Cold water 200ml 200g 22.778 C = 73F

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