SPECIFIC HEAT & CALORIMETRY

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Presentation transcript:

SPECIFIC HEAT & CALORIMETRY PRACTICE!! SPECIFIC HEAT & CALORIMETRY

TEST CONTENTS: Density Problems (See Density FA on wiki) Temperature conversions (°C K) Energy conversions (J cal) using conversion factors (dimensional analysis) Basic Specific Heat calculation using Q = m SH ΔT Calorimetry calculation (BONUS)

When converting Celsius to Kelvin… A. Subtract 273. B. Add 273. C. Divide by 273. D. Multiply by 273.

Celsius is… A. never negative B. the absolute temperature scale C. always larger than Kelvin D. always smaller than Kelvin

A calorie is A. equal to 4.184 Joules B. equal to 1 Calorie C. 1000 kilocalories D. a nutritional unit used on food labeling

Specific heat is A. a physical property B. expressed in J/g°C C. the amount of heat energy used to raise 1 gram of a substance by 1°C D. all of the above

When solving a specific heat problem it is required that you A. list all givens with units B. state the basic equation C. rearrange the BE if necessary D. plug in all variables to the RE E. use proper significant figures F. all of the above

Specific Heat Calculation Show all of your work! A 152 g sample of aluminum at – 37°C is heated until it reaches 15.00°C. Find the heat content energy of the system.

Calorimetry Calculation Show all of your work! 240.0 g of water (initially at 20.2ºC) are mixed with an unknown mass of iron (initially at 533.3ºC). When thermal equilibrium is reached, the system has a temperature of 42.8ºC. Find the mass of the iron.

Answer Key B 2. D 3. A 4. D 5. F 6. 7030 J 7. 103 grams Fe