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Figure 2a shows the changes in atmospheric carbon dioxide (CO2) concentration measured in a biomass chamber containing a stand of soybean plants. The plants were subjected to cyclic periods of artificial lighting and darkness. During the periods of illumination, small amounts of CO2 were injected into the chamber to prevent the concentration of this gas falling below 1.0-2.5 mmol mol-1(because in a real situation, this would have implications for human health). Figure 2b shows the changes in ambient oxygen concentration measured in a separate experiment using a second biomass chamber containing a similar stand of soybean plants
Figure 2 Gas exchange in a stand of soybean plants measured in a biomass chamber. (a) Changes in atmospheric concentration of carbon dioxide during periods of artificial lighting (non-shaded) and darkness (indicated by grey shading). (b) Changes in oxygen concentration for a stand of soybean plants grown in a biomass chamber (periods of lighting and darkness as indicated in (a)). Note that a different scale for the x-axis has been used in each graph.
(i) Using your knowledge of plant metabolism, write a short account explaining how it produces the changing pattern of CO2 concentration?
Consider the structure of 1-butanol and explain why this alcohol does not undergo SN1 reactions.
what is the molecular formula of the compounds created by fecl3
Vitamin C is essential for prevention of scurvy (and large doses may be effective in preventing colds). Combustion of a 0.2000-g sample of this carbon-hydrogen-oxygen compound yields 0.2998 g CO2 and 0.0819 g H2O. What is the EMPIRICAL FORMULA of ..
Sodium chloride, NaCl, is a strong electrolyte, as is hydroiodic acid, HI. Write the chemical equations for what happens when these substances are added to water.
a skyscraper in pittsburgh built in the early 1970s is supported by water filled columns. potassium carbonate was added
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken
What effect does the structure of the alkyl halide (the substrate) have on SN1 and SN2 reactivity. For each reaction mechanism (SN1 and SN2) compare simple primary, secondary, and tertiary alkyl halides.
Briefly describe the pathway of the protons and electrons of two hydrogen atoms that come from NADH/H+ and pass through the electron transport chain apparatus (including complexes I - V). What are the major electron carriers within these complexes
Draw a concentration cell for 0.10 M Cu2+ and 2.0 M Cu2+ cell, show the following on each compartment clearly. a) All the component of each cell, including the concentrations in anode and cathode half cells.
How many oxygen atoms are there in 52.06 g of carbon dioxide? Hint: How many O atoms does each carbon dioxide molecule contain
Calculate the molarity of the following solutions. a) 0.600 mol of Na2S in 1.40 L of solution. b) 20.1 g of MgS in 851 mL of solution.
What is the pH at the equivalence point of a weak base-strong acid titration if 20.00 mL of NaOCl requires 28.30 mL of 0.50 M HCl? Ka = 3.0 × 10-8 for HOCl.
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