*Please type your answers so I can read them* 1.) Consider Part A of the Procedu

Question

*Please type your answers so I can read them*

1.) Consider Part A of the Procedure

a.) Give one example of a mistake a student could make.

b.) Explain in detail how this mistake would impact determining the heat capacity of the calorimeter

c.) Would this error impact the rest of the procedure? Why or why not?

PART A Determining the Heat Capacity of a Coffee Cup Calorimeter nitrate, copper, zinc um metal m cup large d a 100 ml 1 Place a 100 mL. beaker into the small Styrofoam cup. Stack this into the larger Styrofoam cup as shown Thermometer m cup large the smal Stirring rod in Figure 5.4 oil 2 Measure out exactly 50.0 mL Calorimeter lid of distilled water in a 100 mL graduated cylinder and add this to the beaker. You have now created your calorimeter. Two nested Styrofoam cups 3 Monitor the temperature of your calorimeter. When the reading stabilizes such that the temperature is no longer cylinder Heat changing, record this temperature as the initial temperature of the calorimeter in Table 5.1 FIGURE 5.4 Setup of a coffee cup calorimeter. on the data sheet, page 136 4 Prepare the hot-water sample using the following steps a Add 100 mL of distilled water to the 250 mL beaker. b Heat this water on a hot plate Caution until the temperature of the water reads approximately 65°C. To avoid burning your hand, wear a heat mitt when transferring c Carefully measure out exactly the hot water 50.0 mL of this hot water in a 100 mL graduated cylinder d Measure and record the temperature of this hot water in Table 5.1 and then immediately add the water to your calorimeter. Place the lid on the calorimeter and add a stir rod through the hole in the lid. e

Explanation / Answer

A) One example of a mistake could be, not to be carefull where you put the hot water, this is that if you let the beaker touch the table and something is too cold or you wait too much to put the hot water into the calorimeter.

B) This would make an impact on the temperature of the hot water, maybe you would read a temperature of 65C but if you wait too much or get distracted the temperature could get to 60 C or maybe 55C and you wouldn´t notice.

So when the hot water reaches equilibrium with the cold water this temperature would be lower than the temperature you may have gotten by putting the hot water into the calorimeter inmediately after measuring the temperature.

theoretical example

being carefull: Final temperature 45

waiting too much to put the hot water: Final temperature would be lower than 45, let´s say 40C

C) The mistake I have explained will not make you to stop the procedure, you can keep going, but if you repeat the procedure and do it correctly by the time you calculate the standard deviations you might get confused with the results, the result will contrast with the heat capacities of trials 2 and 3.

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