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matter
anything that takes up space and has mass
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elements
any substance that can't be separated into simpler substances by chemical means
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compounds
- atoms of different elements bonded together
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mixture
2 or more substances physically combined
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atom
---basic building block of matter
- --smallest part of an element
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nucleus
dense, positively charged center
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protons
positively charged particles in the nucleus
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neutrons
neutral particles in the nucleus (no charge)
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electrons
negatively charged particle surrounding the nucleus
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atomic mass
represents the total neutrons and protons in an atom
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atomic weight
represents the total neutrons and protons in an atom
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atomic number
represents the number of protons in an element
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isotopes
same number of protons but different number of neutrons
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chemical change
- -new compounds formed
- examples of: color change, odor, precipitate, bubbling
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physical change
- NO new compounds formed
- -substances only physically mix
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precipitate
new solid formed in a chemical reaction
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