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31 Cards in this Set
- Front
- Back
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Matter
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anything that takes up space
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Chemical properties
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those characteristics that describe how a substance interacts with other substances
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Physical properties
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characteristics that can be observed without changing the composition of the substance
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atom
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the smallest unit of an element that has all the properties of the element
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neutrons
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subatomic particles found in the nucleus of the atom with no charge
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protons
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subatomic particles that are found in the nucleus of the atom with a positive charge
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electrons
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subatomic particles found in a region of space around the nucleus with a negative charge
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electron cloud
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the region of space around the outside of the nucleus where electrons are found
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atomic number
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a number assigned to elements by scientists that is the sum or total of the electrons plus the protons of that atom
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periodic table
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a system for classifying elements
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mass number
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a number that represents the total or sum of the the protons and neutrons in an atom
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solid
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particles are packed tightly together
has a definite shape and volume |
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liquid
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particles have spaces between them
has a definite volume, but takes the shape of the container it is in |
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gas
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wide spaces between particles
no definite shape or volume |
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compound
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when atoms of two or more elements are chemically joined
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molecule
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smallest complete unit of a compound
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diatomic molecule
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made up of two atoms
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energy levels
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found within the electron cloud these are levels that hold the electrons
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chemical bonds
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forces holding atoms together
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ionic compound
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a compound formed through the transfer of electrons
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covalent bond
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a bond formed by the sharing of electrons between atoms
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chemical formula
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shows what elements and the number of atoms of elements found in a compound
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mixture
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contains two or more substances that are NOT chemically combined
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solution
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a mixture in which one substance is equally dispersed (spread) throughout another substance.
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smog
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an unhealthy mixtures of dust and fumes from industrial smoke stacks and car exhausts
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alloy
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a solution of two or more metals
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ion
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an atom or a group of atoms that carry an electrical charge
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ionic bond
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a bond made by the transfer of electrons from one atom to another
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isotopes
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atoms of the same element that have different number of neutrons
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chemical bond
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force that holds atoms that combine to make a compound
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covalent compound
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a compound formed by the sharing of electrons
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