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| What is our model of the atom? |
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| properties of electrostatic force |
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-negative electrons attract positive protons
-like charges repel
-in electron cloud
-dependent on charge |
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| properties of a strong nuclear force |
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-independent of charge
-short ranged
-attracts easily
-strong; hard to tear apart |
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| atomic number determined by |
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| mass of an atom determined by |
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| What are the three main categories for elements? |
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| Metals, non-metals, and metalloids |
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| Factors of a physical change: |
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-phase change
-color change
-change in shape |
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| Factors of a chemical change: |
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-unexpected color change
-gas produced
-precipitate formed
-unexpected change in temperature
-mass change
-produces a new compound |
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| What is the formula for percent of weight changed? |
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final-intitial
----------
initial
x 100 |
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| What type of molecule is water? |
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| components don't dissolve in one another; particles are large and settle out at the bottom. |
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| particles stay suspended but do not dissolve in mixture |
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| Same concentration without |
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| all that can be put in a solvent and dissolve is in |
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same throughout
(think about gay people, same sex) |
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diatomic elements
(have no fear of ice cold beer) |
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| Hydrogen, Nitrogen, Fluorine, Oxygen, Iodine, Chlorine, Bromine |
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| to find the volume of irregularly shaped object |
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| place in water and measure water level that rised |
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| using density to identify elements |
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| density is specific to each element |
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