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Chapter 13,14,15test

the joining of two atoms to form new substances chemical bonding
interaction that holds two atoms together chemical bond
what is the number of protons ( and electrons) in an atom? atomic number
what are electrons organized in? energy levels
what is the electron(s) in the outermost energy level? valence electrons
what determines whether the atom will form bonds? valence electrons
what is considered a full outer energy level? 8
atoms bond by ---, ---, or --- electrons in the outermost energy level. gain,lose or share
do all atoms need 8 electrons to have a full outer energy level? no
how does an ionic bond form? when electrons are transfered from atom to atom
when is an atom nuetral? when it has the same number of electrons as protons
what are charged particles that form when atoms gain or lose electrons? ions
nonmetals usually --- electrons gain
what is a repeating 3D pattern formed when ions bond? cyrstal lattice
what type of charge do ionic compounds have? none
what are some properties of covalent bonds? brittle, low melting and boiling points
in covalent bonds, atoms --- electrons share
what is a molecule? compound that consists of two or more atoms joined in a definite ratio
what are electron dot diagrams used to show? the number of valence electrons in an atom
diatomic molecules are molecules made up of --- atoms 2
what are diatomic elements? elements that are found in nature as diatomic molecules
what is a bond formed from the attraction of metal ions and electrons? metallic bond
what are some properties of metal? ductile, malleable, conduct electric current
a process in which one or more substances change to make one or more new substances chemical reaction
what is a precipitate? a solid substance that is formed in a solution
what are some signs of a chemical reaction? gas formation, precipitate, change in energy
what is the froce that holds 2 atoms together in a molecule? chemical bond
for new bonds to form, the old ones must --- break
shorthand way to use chemical symbols and numbers to represent a substance chemical formula
what is a subscript? a number written to below and to the right of a chemical formula in a formula
tetra= 4
di= 2
deca = 10
hexa= 6
octa= 8
mono= 1
tri= 3
penta= 5
hepta= 7
nona= 9
what uses chemical symbols and formulas as a shortcut to describe a chemical reaction? chemical formula
what is a coefficent? the number that is placed in front of a chemical symbol or formula
states that mass is neither created or destroyed in ordinary chemical and physical changes law of conservation of mass
type of reaction in which two or more substances combine to form one new compound synthesis reaction
what reaction is the reverse of a synthesis reaction? decompostition reaction
type of reaction in which an element replaces another element that is part of a compound single-displacement reaction
what are the products of a single-displacement reaction? a new compound and a different element
a type of reaction in which ions from two compounds change places double-displacement reaction
what is needed to break chemical bonds in reactants? energy
exothermic --- energy and endothermic --- energy releases; takes in
Created by: kfran0112