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As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit
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Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g. what is the percent by mass of water in the hydrate? %
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A 10.0 cm sample of copper has a mass of 89.6 g. What is the density?...
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