Chapter 13,14,15test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| the joining of two atoms to form new substances | chemical bonding
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| interaction that holds two atoms together | chemical bond
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| what is the number of protons ( and electrons) in an atom? | atomic number
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| what are electrons organized in? | energy levels
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| what is the electron(s) in the outermost energy level? | valence electrons
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| what determines whether the atom will form bonds? | valence electrons
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| what is considered a full outer energy level? | 8
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| atoms bond by ---, ---, or --- electrons in the outermost energy level. | gain,lose or share
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| do all atoms need 8 electrons to have a full outer energy level? | no
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| how does an ionic bond form? | when electrons are transfered from atom to atom
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| when is an atom nuetral? | when it has the same number of electrons as protons
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| what are charged particles that form when atoms gain or lose electrons? | ions
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| nonmetals usually --- electrons | gain
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| what is a repeating 3D pattern formed when ions bond? | cyrstal lattice
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| what type of charge do ionic compounds have? | none
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| what are some properties of covalent bonds? | brittle, low melting and boiling points
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| in covalent bonds, atoms --- electrons | share
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| what is a molecule? | compound that consists of two or more atoms joined in a definite ratio
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| what are electron dot diagrams used to show? | the number of valence electrons in an atom
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| diatomic molecules are molecules made up of --- atoms | 2
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| what are diatomic elements? | elements that are found in nature as diatomic molecules
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| what is a bond formed from the attraction of metal ions and electrons? | metallic bond
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| what are some properties of metal? | ductile, malleable, conduct electric current
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| a process in which one or more substances change to make one or more new substances | chemical reaction
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| what is a precipitate? | a solid substance that is formed in a solution
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| what are some signs of a chemical reaction? | gas formation, precipitate, change in energy
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| what is the froce that holds 2 atoms together in a molecule? | chemical bond
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| for new bonds to form, the old ones must --- | break
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| shorthand way to use chemical symbols and numbers to represent a substance | chemical formula
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| what is a subscript? | a number written to below and to the right of a chemical formula in a formula
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| tetra= | 4
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| di= | 2
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| deca = | 10
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| hexa= | 6
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| octa= | 8
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| mono= | 1
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| tri= | 3
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| penta= | 5
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| hepta= | 7
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| nona= | 9
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| what uses chemical symbols and formulas as a shortcut to describe a chemical reaction? | chemical formula
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| what is a coefficent? | the number that is placed in front of a chemical symbol or formula
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| states that mass is neither created or destroyed in ordinary chemical and physical changes | law of conservation of mass
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| type of reaction in which two or more substances combine to form one new compound | synthesis reaction
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| what reaction is the reverse of a synthesis reaction? | decompostition reaction
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| type of reaction in which an element replaces another element that is part of a compound | single-displacement reaction
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| what are the products of a single-displacement reaction? | a new compound and a different element
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| a type of reaction in which ions from two compounds change places | double-displacement reaction
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| what is needed to break chemical bonds in reactants? | energy
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| exothermic --- energy and endothermic --- energy | releases; takes in
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