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When a candle is cooling down is it a physical or chemical change

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Light waves can move through , but they travel fastest when they move through a(n) .

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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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What is the enthalpy of combustion (per mole) of c4h10 (g)? –2,657.5 kj/mol –5315.0 kj/mol –509.7 kj/mol –254.8 kj/mol

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What is the full form of icc in chemistry?

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