In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. Water Thermometer Metal sample Stirring rod Since the cup itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter and the value determined is called the calorimeter constant. One way to do this is to use a common metal of known heat capacity. In the laboratory a student heats 100.00 grams of nickel to 98.10 °C and then drops it into a cup containing 79.36 grams of water at 23.62 °C. She measures the final temperature to be 32.36 °C. Using the accepted value for the specific heat of nickel (See the References tool), calculate the calorimeter constant. Calorimeter Constant = J/°C

In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. Water Thermometer Metal sample Stirring rod Since the cup itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter and the value determined is called the calorimeter constant. One way to do this is to use a common metal of known heat capacity. In the laboratory a student heats 100.00 grams of nickel to 98.10 °C and then drops it into a cup containing 79.36 grams of water at 23.62 °C. She measures the final temperature to be 32.36 °C. Using the accepted value for the specific heat of nickel (See the References tool), calculate the calorimeter constant. Calorimeter Constant = J/°C

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Reveiw steps of the calorimetry experiment. Describe how a calorimetry experiment is used to determine the enthalpy of a reaction. Gather the items to set up your calorimeter (coffee-cup, stir plate and stir bar, Vernier temperature probe, lid for coffee-cup) Pour 50.0 mL of DI water into the coffee-cup calorimeter. You will be preparing 50.0 mL of a 1.0 M solution of sodium nitrate solution. Using the Vernier temperature probe, record the initial temperature of your DI water. Weigh out the mass of sodium nitrate needed for your solution and pour it into the calorimeter. Immediately begin collecting temperature data. Repeat multiple times.
For an exothermic reaction, how is the measured temperature change affected if some of the heat produced transfers to the calorimeter? How will the determination of the specific heat of the metal be affected if the thermometer used to record the temperature of the water bath reads too low?
1.What happens to the heat capacity (CP) of a metal sample if its mass is doubled? Explain your answer[hint: examine the units and consider using the terms “intensive” or “extensive” in your answer]. 2.What happens to the specific heat (cs) of a metal sample if its mass is doubled? Explain your answer [hint:examine the units and consider using the terms “intensive” or “extensive” in your answer].
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Ignition wires heat Thermometer Stirrer A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. sample Since the "bomb" itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter. %3D Water In the laboratory a student burns a 0.596-g sample of acetylsalicylic acid (C,H3O4) in a bomb calorimeter containing 1090. g of water. The temperature increases from 24.40 °C to 26.80 °C. The heat capacity of water is 4.184 J gl°C 1 The molar heat of combustion is -3869 kJ per mole of acetylsalicylic acid. C,H3O4(s) + 9 O2(g) - →9 CO2(g) + 4 H20(1) + Energy Calculate the heat capacity of the calorimeter. Burning sample Insulated Sample dish Steel outside chamber bomb heat capacity of calorimeter = J/°C Combustion (bomb) calorimeter.
thermometer A 59.2 g sample of iron is put into a calorimeter (see sketch at right) that contains 200.0 g of water. The iron sample starts off at 95.8 °C and the temperature of the water starts off at 24.0 °C. When the temperature of the water stops changing it's 27.1 °C. insulated container The pressure remains constant at 1 atm. water Calculate the specific heat capacity of iron according to this experiment. Be sure your answer is rounded to 2 significant digits. sample a calorimeter g.°C Explanation Check O2021 McGraw-Hill Education. All Rights Reserved Terms of Usse Privacy Accessibi MacBook Ai
In the laboratory a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used to determine the specific heat of a solid, or to measure the energy of a solution phase reaction. Thermometer Metal sample ©2003 Thomson-Brooks/Co Stirring rod Since the cup itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter and the value determined is called the calorimeter constant. One way to do this is to use a common metal of known heat capacity. In the laboratory a student heats 93.37 grams of zinc to 98.36 °C and then drops it into a cup containing 81.25 grams of water at 21.46 °C. She measures the final temperature to be 28.84 °C. Using the accepted value for the specific heat of zinc (See the References tool), calculate the calorimeter constant. Calorimeter Constant = J/°C
Mass of aluminum can 38.57 Mass of aluminum can and water 138.68 Mass of water 99.15 Initial mass of paraffin wax candle (before the experiment) 10.56 Final mass of paraffin wax candle (after the experiment) 10.45 Mass of paraffin wax consumed 0.16 Initial temperature of water and aluminum can calorimeter 23.3 Final temperature of water and aluminum can calorimeter 29.5 Change in temperature 0.4 Calculate the molar enthalpy of combustion for paraffin wax.