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27 Cards in this Set
- Front
- Back
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what is a proton's charge?
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postive
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what is a neutron's charge?
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neutral
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what is an electron's charge?
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negative
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how would you figure out the neutron # of an element
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you would subtract the proton # and the mass # to get your answer
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where is the proton and the neutron in an atom?
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the neucleus
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about how many elements are existing today?
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90
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what happens if more than one element combines?
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it becomes a compound
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a property that describes a change that occurs when one substance reacts with another
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chemical property
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the forces that hold the atoms together in compounds
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chemical bonds
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what is something not chemically combined
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mixture
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what is the fastest moving state of matter
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plasma
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what is the slowest movement of matter
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solid
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name them in order
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solid
liquid gas plasma |
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who lived 2,300 years ago and discovered atoms
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Democritis
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who lived in the 1700s and said that elements are made up of only 1 type of matter
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john dalton
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who lived in 19b and made a planetary model
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Neils Bohr
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can compounds be broken down?
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no
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when atoms combine they make something ____
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different
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an ___ is made of one type of atom on the periodic table
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element
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covalent shares __
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electrons
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the ionic ___ and gains electrons
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loses
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what bond is when electrons are free to move from one ion to another
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metallic
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what bond is when no interaction between electrons polar molecule
has + and - charged areas which attract other polar molecules |
hydrogen
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what contains only one kind of atom
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element
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what forms a cloud around the nucleus
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electrons
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what exists mostly in a gas?
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oxygen
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what is electrically charged
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ion
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