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15 Cards in this Set
- Front
- Back
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Anything that occupies space and has mass
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Matter
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Pure substance; cannot be further broken down
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Element
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The 4 elements that make up 96% of our body
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Oxygen, Carbon, Hydrogen, and Nitrogen
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Two or more elements chemically combined in a fixed ratio
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Compound
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Smallest possible particle of an element
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Atoms
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Subatomic Particles
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Proton- (+) positive electric charge in the nucleus
Neutron- neutral electric charge in the nucleus Electron-(-) negative electric charge |
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Same number of protons, different number of neutrons
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Isotopes
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Nucleus breaks down over time, giving off radiation
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Radioactive Isotope
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Electrons determine...how reactive an atom is and what type of bond it will form
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Reactivity
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Electron Energy levels
first level? second level? |
First level- 2 electrons
Second level- 8 electrons |
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Attractions that holds atoms together
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Chemical bonds
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Transfer of Electons
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Ionic Bond
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Electrically charged atoms because of the gain or loss of electrons
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Ions
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1)Share electons
2) # of bonds= # of electons needed 3) Makes molecules- two or more atoms |
Covalent Bond
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Formation of one or more new substances
Break and/or create new bonds Reactants=starting materials Products=end materials |
Chemical Reactions
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