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Selectively permeable means that some molecules can move through the membrane while others cannot. Movement through membranes is called transport. Diffusion and ...
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Name: Date: Gummy Bear Osmosis Lab #: __________ Purpose : to investigate the movement of water into and out of a Gummy Bear Problem: Where is the concentration of water molecules highest, tap water or salt water? Background Information: Molecules are in constant motion, and tend to move from areas of higher concentrations to lesser concentrations. Diffusion is defined as the movement of molecules from an area of high concentration to an area of low concentration. The diffusion of water molecules through a selectively permeable membrane is known as OSMOSIS. Selectively permeable means that some molecules can move through the membrane while others cannot. Movement through membranes is called transport. Diffusion and osmosis are passive forms of transport; this means that do not need energy to move areas of high concentration to areas of low concentration. Active transport requires energy to transport molecules from low concentration to high concentration. Osmosis is the movement (transport) of water (small dots) through a selectively permeable membrane from an area of high concentration to an area of low concentration. Vocabulary: define the following terms
**1. Concentration:
Answer the following predictions: QUESTION 1 : How will soaking gummy bears in tap water affect the size of the candy? Prediction: explain your prediction based on your knowledge and the background information QUESTION 2 : How will soaking gummy bears in salt water affect the size of the candy? Prediction: explain your prediction based on your knowledge and the background information Materials: 1 beaker with tap water 1 beaker with salt water Masking tape Marker Ruler Scale Wax paper Spoon Procedure: DAY 1