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Ch. 3 Review Do NoW

Ch. 3 Review Do NoW. Ch 3 Review Do Now:. How much heat does a 10g gold (Au) nugget absorb when it heats up from 25 C to 35 C? (Cp = 0.129 J/ gC ) What is the change in temperature for a 50g iron bar that gives off 3.5 kJ of heat? (Cp = 0.44 J/ gC )

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Ch. 3 Review Do NoW

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  1. Ch. 3 Review Do NoW

  2. Ch 3 Review Do Now: • How much heat does a 10g gold (Au) nugget absorb when it heats up from 25 C to 35 C? (Cp = 0.129 J/gC) • What is the change in temperature for a 50g iron bar that gives off 3.5 kJ of heat? (Cp = 0.44 J/gC) • What is the final temperature of a mixture of 2 glasses of water: one has 130g of water at 25 C, the other glass has 120g of water at 40C? • 2 kg block of ice melts. How much energy did it take to melt the ice block? (water’s Hf = 335 J/g) • Did the ice block above absorb or release energy?

  3. What is the number that converts between Celsius and Kelvin scales? • Can you have negative Kelvins? Why/Why not? • Convert 373 K to degrees Celsius • Convert -200 C to Kelvins

  4. Do Now • In which story will the heat flow fastest: • 100 C water is mixed with 2 C water • 50 C water is mixed with 2 C water • Do metals typically have high specific heats? Why? • What affects the specific heat value for a metal? • Is heat absorbed or released in each of these processes: • Melting • Freezing • Boiling • Condensing • What are the differences between the Kelvin and Celsius scales? (What are they each based on?) • What are “intermolecular forces”? Will a liquid with strong intermolecular forces evaporate away quickly?

  5. Do Now • What are the standard boiling and freezing points for water in these scales: Celsius, Fahrenheit and Kelvin? • What is the temp at which air is saturated with water called? • Thermal energy absorbed/released during a phase change is called ____ ____. (Hint: there are two types of this heat: Heat of Fusion and Heat of Vaporization) • Which law of thermodynamics says that heat energy must be conserved? • Which law of thermo says that heat only flows from “hot” to “cold”? • When is thermal equilibrium reached between two objects? • What are the 3 types of systems? • Which system only allows energy to flow from/into it?

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