1. Temperature and Heat Unit Conversions
Thermochemistry
Temperature and Heat Unit Conversions

2. Temperature
Temperature is a measure of the average kinetic energy of the particles in a sample of matter.
The hotter a substance feels or its temperature is, the more kinetic energy its particles have.
The Kelvin and Celsius temperature scales are used in science.

3. Temperature Conversions
Remember: Kelvin is always bigger than Celsius
The equation to convert Celsius to Kelvin:
K = °C
What is the equation to convert Kelvin to Celsius?
°C =

4. Practice temperature conversions …watch sig figs…
Convert 25.00°C to Kelvin:
Convert K to Celsius:
Convert °C to Kelvin:

5. Practice temperature conversions (Answers)
Convert 25.00°C to Kelvin:
K = °C
K = °C = 298 K
Convert K to Celsius:
°C = K
°C = K = 27 °C
Convert °C to Kelvin:
K = °C
K = °C = 8 K

6. ENERGY
Energy always flows from substances with higher temperature to substances with a lower temperature.
Energy can be measured in calories or joules
1 calorie = joules
The caloric content of foods is actually kilocalories…so 1 Cal from food = 1 kcal.

7. Energy Transfer (try a simulation on pHet. ) Go to phet. colorado
Energy Transfer (try a simulation on pHet!) Go to phet.colorado.edu , find Energy Forms and Changes, download and then run. Finicky site.

8. Energy Conversions Use conversion factors and remember sig figs
Remember: joules are bigger than calories
Convert 560.calories into joules:
Convert joules into calories:
Convert 250 Calories (Cal) into calories (cal):

9. Energy Conversions (answers)
Convert 560.calories into joules:
560. cal x J = J
cal
2. Convert joules into calories:
1400. J x 1 cal = cal J
Convert 250 Calories into calories:
250 Cal x cal = x 10 5 cal
Cal