lecture 2

# lecture 2 - 1 An information-level question What are the...

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Unformatted text preview: 1 An information-level question: What are the units associated with the specific heat capacity of a pure substance? A) J/ o C B) J/g o C C) J/mol o C NOTE: could replace J with cal or Cal and o C with¡K. 2 An algorithmic-application-level question: What is the specific heat capacity of a aluminum of it takes 900 J of energy to raise the temperature of 100 g by 10 K? A) 900 J/g K B) 90 J/g K C) 9 J/g K D) 0.9 J/g K q = c s m T Do you know the relationship involving energy, mass, and temperature change? 3 As a joke, your friend puts your gold and silver necklaces in the freezer. The gold necklace, Au, has a mass of 200 g, and the silver necklace, Ag, has a mass of 75 g. The specific heat capacities are 0.13 J g –1 o C –1 for Au and 0.24 J g –1 o C –1 for Ag. If both start out at -10 o C when you put them on, and energy is transferred to them at the same rate, which will reach body temperature first , and why? An conceptual-understanding-level question: 4 The Au necklace has a mass of 200 g and c s = 0.13 J g-1 o C-1 . The Ag necklace has a mass of 75 g and c s = 0.24 J g-1 o C-1 . Both start out at -10 o C. Energy is transferred to them at the same rate. Which reaches body temperature first? A. Au because it has the smaller specific heat capacity. B. Ag because it has the larger specific heat capacity....
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## This note was uploaded on 02/12/2010 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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lecture 2 - 1 An information-level question What are the...

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