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There are main groups in the modern periodic table of elements
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This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.
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Joan writes four numbers on the board in standard form, and then she writes their scientific notation
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Chemistry, 22.06.2019 09:00
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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What drives energy flow and chemical cycling on earth?...
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