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Chemistry, 22.06.2019 07:30
Using data from seismic waves, geologists have learned that earth’s interior is made up of several
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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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Chemistry, 22.06.2019 23:00
What element has similar physical and chemical properties as boron.
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Chemistry, 23.06.2019 01:00
Which of the following is a physical change? a.burning a piece of wood b.sawing a piece of wood in half c.rust forming on an iron fence d.a copper roof changing color from orange to green
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