Science Work, Help Please!

1. A. What is diffusion?

1. B. Use diffusion to
explain what happens when you drop a
sugar cube into a mug of hot tea.

2. A. What is osmosis?

2. B. Describe how water molecules
move through the cell membrane during
osmosis.

Diffusion is the spreading of something more widely. When you drop a sugar cube in hot tea the sugar cube spreads out and the sugar starts to dissolve in the tea. Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane. If the concentration of water molecules ouside the cell is lower than the concentration of water molecules outside the cell then the water moves out through osmosis. Water travels through the cell membrane.

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