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Chemistry, 21.06.2019 15:50
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What are the similarities of physical and chemical change ?
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Chemistry, 22.06.2019 10:50
An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons
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What mss of sulfamic acid is required to make 250cm3 of a 0.150mol/dm3 solution? please help
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