When sample X is passed through a filter paper a white residue. Y. remains on the paper and a clear
liquid. Z. passes through. When liquid Z is
vaporized, another white residue remains. Sample
K is best classified as

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

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