Seaweed at Southside Seaport Lab

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Seaweed At Southside Seaport Warm Up 1. Coffee beans are crushed into small pieces, water is added to it and the mixture is heated over a flame. What do you think would happen to the coffee beans as it interacts with the water? Explain your prediction. The crushed coffee grounds would dissolve with the water, forming a solution of water and coffee. However, not all of the coffee beans would dissolve. The insoluble chunks of the coffee beans would remain solid and stay apart from the water. Due to the mixing of the coffee and the water, the solution would take on a brown color and have a distinct smell. 2. What would happen to the water if instead of coffee beans, strips of dried seaweed were used? Explain your prediction. Since the dried seaweed is not as soluble as the coffee beans, a solution of seaweed and water would not form. Rather, overtime the dried seaweed would soften with the water and form a mixture. 3. Define: a. Decant- gradually pour from one container to another, leaving the solid behind. b. Filtrate- a liquid that has passed through a filter c. Extract- a preparation containing an active ingredient of a substance in concentrated form d. Precipitate- the formation of a solid in the reaction of a solution e. Tincture- a medicine derived by dissolving a drug in alcohol Notebook (Photocopies included) Observations: -Iodine crystals- glittery, brown-black in color, small pieces with a length of about 4 mm and thickness of about 2 mm, brittle -Fucus seaweed- dry, dark green, strong pungent scent, stiff, easily snapped into two pieces -Tincture- brown liquid, strong alcohol scent, fairly thin and runny -Isopropyl alcohol- clear liquid, alcohol smell Observation of reagents, starting materials and changes during extraction: We broke the dried seaweed into small
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