Chemistry 101-01 Monday, February 14,
2011
Chapter 4: Properties of Matter
Main Points
-Endothermic & Exothermic Reactions
-Chemical & Physical Changes
Equation
S . H .=q
M × ∆ T
or
S . H .=J
g℃
S.H. means Specific Heat
Q means heat lost or heat gained (Joules)
M means mass (Grams)
ΔT(Delta Temperature) equation is TT(Delta Temperature) equation is Tfinal –Tinitial = ΔT(Delta Temperature) equation is TT
Example: What is the temperature change when 8.725 g of sodium (Na-1.23
S . H .=J
g℃
) loses
3138 J of heat? If the initial temperature of the metal was 63.9
℃
, what is the final temperature?
*To make it easier on how to solve the equation make a little information chart with the data that
the problem has given you.
S.H. – 1.23
S . H .=J
g℃
q- 3138 J
m- 8.72
Tinitial – 63.9
℃
ΔT(Delta Temperature) equation is TT- 293
℃
*How to get ΔT(Delta Temperature) equation is TT with the initial or final temperature?
S . H .
1=q
m × ∆ T
(cross multiply)
