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Compare and contrast physical changes with chemical changes.
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About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?
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An ion has a net charge of 3+. If this ion has 8 protons, how many...
An ion has a net charge of 3+. If this ion has 8 protons, how many...
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