DO NOW: (on the front of your WS)

1. DO NOW: (on the front of your WS) Define each of the variables below AND list all possible units! Units: q = _______________ _________ m = _______________ _________ c = _______________ _________ ∆T = _______________ _________

2. q=mcΔT q= m= c= ΔT= heat (J or cal) mass (grams) cal J specific heat or g˚C g˚C change in temperature (˚C) (Tfinal-Tinitial)

3. Notes Unit: Thermochemistry q=mcΔT Day 2

4. After today you will be able to… • Explain specific heat (c) and use the specific heat equation: q=mcΔT

5. Example: How much heat (in Joules) is needed to raise the temperature of 257 g of ethanol (c = 2.4 J/g˚C) by 49.1˚C. ? J q= m= 257 g c= 2.4 J/g˚C ΔT= 49.1˚C (49.1˚C) (2.4 J/g˚C) q= (257g) q= 30,285 J = 3.0 x 10⁴ J

6. Example: How many kilojoules of heat are required to heat 1.37 kg of water from 21.3°C to 89.5°C? ? kJ q= 1000 g m= x 1370 g = 1.37 kg 1 kg c= 4.18 J/g˚C ΔT= 89.5-21.3= 68.2˚C (68.2˚C) ? J = (4.18 J/g˚C) (1370 g) 1 kJ q = 390,554 J x 1000 J q = 391 kJ

7. Questions? Complete WS!

8. SILENCE IS GOLD-EN