Don't get confused

Chemistry Level 1

What is the term for the movement of water across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration?

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100 Day Summer Challenge

Don't get confused

Excel in math and science

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It's hard to learn from lectures and videos

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Master advanced concepts through explanations, examples, and problems from the community.

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Community

100 Day Summer Challenge

Don't get confused

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations, examples, and problems from the community.

Used and loved by 4 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.