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Which of the following is not a physical change? a. burning wood b. cutting your hair c. ripping a shirt d. cutting down a tree
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Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?
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Who examines and coordinates the cleanup of polluted sites?
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Which of the following is not a physical change? a. burning wood b. cutting your hair c. ripping a...
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