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8. Compare your observations and R values with those of your class.pdf

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8. Compare your observations and R values with those of your classmates. Identify sources of error in this investigation that might account for any differences. (2 marks) 9a. Is chlorophyll the dominant pigment in the spinach leaf? (1 mark) b. How can you tell? (1 mark) yes/no c. What other pigments were present? Why are they not visible except on chromatography paper? (2 marks) d. Why is it necessary to have variety of pigments in a leaf (1 mark) 10a. Why does the solvent travel up the chromatography paper? (1 mark) b. Explain why the pigments separate as the solvent moves up the paper? (1 mark) c. Which pigment is (a) most soluble and (b) least soluble in the solvent? Explain how you decided. (3 marks) 11. Leaves in Ontario change color in the fall. However, leaves in Florida do not change color in the fall. Why is this so? (Hint: Think of a difference between the two locations that might act as a trigger for leaves to change color in the fall.) 3 marks).

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8. Compare your observations and R values with those of your classmates. Identify sources of error in this investigation that might account for any differences. (2 marks) 9a. Is chlorophyll the dominant pigment in the spinach leaf? (1 mark) b. How can you tell? (1 mark) yes/no c. What other pigments were present? Why are they not visible except on chromatography paper? (2 marks) d. Why is it necessary to have variety of pigments in a leaf (1 mark) 10a. Why does the solvent travel up the chromatography paper? (1 mark) b. Explain why the pigments separate as the solvent moves up the paper? (1 mark) c. Which pigment is (a) most soluble and (b) least soluble in the solvent? Explain how you decided. (3 marks) 11. Leaves in Ontario change color in the fall. However, leaves in Florida do not change color in the fall. Why is this so? (Hint: Think of a difference between the two locations that might act as a trigger for leaves to change color in the fall.) 3 marks)

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