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Chemistry, Gas, Liquid, Solid, React with acid:, Mg (-1), Cl (2),…
Chemistry
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Chemical Formula
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Reminders
- Do not predict valencies of transition elements（那堆中间的）
- If only non-metal :arrow_right: don't simplify
- Some non-metal forms oxides with different formulae
Three states of matter
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Solid: ordered, definate shape & volume; fixed pattern, close together; vibrates
Liquid: Semi ordered and definate volume, shape NOT ordered because it can flow; no fixed pattern, close together; slide past
Gas: Random, no definate shape and volume; randomely arranged, far away from each; move frequently
Isotopes
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radioactivity
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Non-radioactive: regular balance of proton, neutron, and electrons
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matter be divided as...
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How to distinguish: If pure, it contains ONLY ONE SUBSTANCE; If impue, it can be SEPERATED INTO TWO OR MORE SUBSTANCES
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The order rule:
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2 nonmetal
If Hydrogen, always COME first
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SPECIAL: If include oxygen (such as OH, NO3, SO4)
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Filtration: 过滤 
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Absorption: Movement of electrons, in to out
Emission: Movement of electrons, out to in
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