Download Ecology 7 Energy in Plants packet

Ecology 7 - Energy in Plants
Sun
Light
(ROY G BIV)
Energy
Hits a Leaf
4 Pigments and their function – Energy
Energy is:_________________________________________________
_________________________________________________________
Problems: 1) Is there energy in plants?
2) If so, how much?
Units:
1. T
2. M
3. Calories
4. Calories/gram
#1.  Delta = Change
T = Temperature
Formula for change in temperature: T = Tf - Ts
Calculate these changes in temperature.
Starting Final
Show Work
15°C
23°C
25
55
5
4
0
28
16
35
52
28
9
91
62
111
104
91
59
18
15
15
T
Ecology 7- Energy in Plants
#2.  M
 Delta = Change
M = Mass
Mass: ____________________________
_________________________________
__________________________________
Mf
Ms
10kg
15kg
29
126
35
92
24
106
18
136
M
Formula for change in Mass:
 M = Mf – M s
#3. Calorie: Unit of heat in the metric system. Represented by (cal).
Food Calorie: amount of energy required to raise the temperature of
1000 grams (1liter) of H2O, 1ºC.
#4. Calories/gram:
Specific heat: The amount of heat required to raise the temperature of 1
gram of a substance by 1C.
Specific heat: spht of water = 1C/g
Heat energy = Mass of H2O x Change of x Specific Heat
(cal)
(g)
temperature
(1cal/gC)
Formula: calories = M x T x spht
Formula: cal/g = M x T x spht = cal
M
g