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Section 2: Free- Response Question A selection of North American tree species was studied
Write your answer to each part clearly. Support your answers in order to measure how much carbon dioxide they were
with relevant information and examples. Where calculations capable of absorbing throughout one year. The results are
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are required, show your work. given in the table below.
Plants use the energy from the sun to convert carbon North American Tree Capacity for CO 2 Absorption
dioxide and water into glucose and oxygen in a chemical Type of tree Average age of Average CO 2 absorption
reaction known as photosynthesis. The balanced chemical tree (years) capacity (kg/tree/year) ±± 2 SE x
formula for this reaction is:
Oak 5 10.02 ± 3.08
6CO 2 + 6HO → CH O 6 + 6O 2 Pine 8.99 ±
12
2
6
(a) Identify the reactants and products in this reaction. 4 2.34
Black walnut 4 7.26 ± 1.86
(b) Describe the key difference between the monosaccha- Maple 3 5.82 ± 1.79
ride glucose and a lipid such as vegetable oil.
Beech 9 18.66 ± 1.55
(c) Identify the type of bond present between the carbon Ash 13 24.01 4.11
±
and oxygen atoms in carbon dioxide. Describe how
this bond is formed. Birch 10 20.42 ± 3.67
(d) Is the role of carbon in this reaction an example of the (e) State a hypothesis that could be explained by the data
flow of energy or the flow of matter through a system? in this table.
Justify your answer.
(f) Determine if there is a statistically significant differ-
ence between the absorption data of black walnut trees
and maple trees.

(g) Determine between which two tree species there is
most likely to be a statistically significant difference.

42 UNIT 1 CHEMISTRY OF LIFE

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