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) specific heat
g˚C
cal
g˚C J
specific heat or
change in temperature (˚C) (Tfinal-Tinitial)

3. Unit: Thermochemistry
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. q= (257g) (2.4 J/g˚C) (49.1˚C) q= 30,285 J = 3.0 x 10⁴ J
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. q=
? J m=
257 g c=
2.4 J/g˚C
ΔT=
49.1˚C q=
(257g)
(2.4 J/g˚C)
(49.1˚C)
q= 30,285 J = 3.0 x 10⁴ J

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

7. Questions? Complete WS!

8. SILENCE IS GOLD-EN