Question

9 Pre-Lab Questions 1. Why can you use a calorimeter to study the exchange of heat? EXPERIMENT A calorimeier is a device u s eol to measure hot of roactisn th lainer wn th vr meni o insulated wall's to prevent hret exchange he enviran 2. Why is specific heat an intensive property? energy at o particular temperature 'is the some Its 9uanhhy towhich no physical alimen sian is agsian eof Nomaler heuw mach alaminunh, Is abiliy to aborb heat 3. Is specific heat a dimensionless quantity? lf there are dimensions, what are they? 4. Walkways on a beach are usually made of wood rather than of a metal such as iron. Why (forge about cost)? 5. Which would be a better coolant in your car engine: pure antifreeze (ethylene glycol, SH 0.57 cal/g C) or water (SH 1.00 cal/g °C)? Why? Post-Lab Questions 1. Would it be a good idea to use glass beakers for the calorimeter rather than the Styrofoan Explain your glass versus a Styrofoam cup). answer (think about holding a cup of hot coffee from your favorite fast-food chain in a cups? oi why do you use the extrapolated value for the maximum temperature from the plot of temperature as a function of time? If, instead, you used the value of the water ang with the metal as the maximum temperature, would the heat capacity of the metal, Q be affected? How? sher t in lea 3. A 26.2-g sample of ethyl alcohol was heated from an initial temperature of 20.0°C (room temperature) to a final temperature of 37.5'C (body temperature). How many calories has the alcohol absorbed? If the same size sample of water was heated in the same temperature range, how many calories would the water absorb? Which absorbs more energy? 4. A 40.5-g sample of metal beads was heated in a water bath to 99,.5 C. The metal was then added to a sample of water (31.6 g) and the temperature of the water changed from an initial tem of 20.0°C to a final temperature of 37.5°C a. What was the temperature of the metal at equilibrium? b. What was the temperature change of the metal? Calculate the specific heat and the atomic mass of the metal. What is the metal? c.

Answer 1

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