Name Lab 4 Section Specific Heat Date Prelab Questions 1. What is the definition

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Name Lab 4 Section Specific Heat Date Prelab Questions 1. What is the definition of specific heat? to raise thu teper ature of tru specified amount of a subaanco 2. What are the units of specific heat? lo c 3. What are the values of the /gcific hear Colge 3. What are the values of the spécific heat of water? · Look up the specific heats of the following metals and fill in the table. Specific Heat Metal Brass Gold Nickel Silver 5 Could the metal described in the Caleulation Example be one of these metals? Explain. 6. How much heat is needed to raise the temperature of 255 g of water from 25.5°C to 95.0 (7.42 × 104 J) 7. What is the mass of a piece of copper if 5,550 J are needed to raise the tempernture 142'0 (102 g) coe of metal at 1000°C drops to 30.9°C when placed in some cool water. The metal loses (0.230 J/g C) 837 J of heat. What is the specific heat of the metal? to tare" something? What is the advantage of taring a c Instructor's Initials Lab 4 51

Explanation / Answer

6. Energy required to raise the temperature of water

energy = mCpdT

with,

m = 255 g

Cp = 4.18 J/g.oC

dT = 95 - 25.5 = 69.5 oC

So,

energy required to raise temperature = 255 x 4.18 x 69.5/1000 = 74.08 kJ              

7. specific heat (Cp) of copper = 0.385 J/g.oC

energy supplied = 5,500 J

dT = 142 oC

So,

mass of copper = 5,500/0.385 x 142 = 100.604 g

8. mass of metal (m) = 52.66 g

change in temperature (dT) = 100 - 30.9 = 69.1 oC

Heat lost = 837 J

So,

specific heat of metal = 837/52.66 x 69.1 = 0.230 J/g.oC

9. "tare" stands for zeroing the value. When we initially weigh the empty container, we tare the mass and then weigh the mass of metal or water in it.

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