PRE-LAB EXERCISES (CONTINUED 5. Consider the following data collected by another

Question

PRE-LAB EXERCISES (CONTINUED 5. Consider the following data collected by another student. Table 1.Specific Heat of Metal Sample Data Mass of metal Volume of water T of boiling water T of water in calorimeter T of water in calorimeter a. Calculate the AT for both the water and the metal. The sign is important. 25.00 g 98.5 mL 99.8°C 22.3 24.1 The hot metal piece was transferred to the calorimeter. Explain how one can determine which loses heat and which gains heat. b. c. Calculate the amount of heat transferred to the water. Using the heat transferred to the water calculate the specific heat of the metal. d. What is the identity of the metal given the table below of specific heats of different metals? 6. Substance Specific HeatSubstance Specitic Heat 128 Lead Nickel Silver Steel in 4.184 water d.1.899 Aluminum Brass Copper Iron 372 .387 -480 234 447 226

Explanation / Answer

5.

(a)

Change in temeperature of water = 24.1 - 22.3 = 1.8 0C

Change in temperature of metal = 24.1 - 99.8 = - 75.7 0C

(b)

SInce the temperature of metal is decreased, metal loses heat.

Since the temperature of water is increased, water gains heat.

(c)

Amount of heat = 98.5 * 4.184 * 1.8 = 741.8 J

(d)

Amount of heat = mass * specific heat * change in temperature

741.8 = 25.00 * specific heat of metal * 75.7

Specific heat of metal = 0.392 J/g.0C

6.

It is approximately equal to the specific heat of copper.

So, the unknown metal is COPPER.

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