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Physical Sci. Ch.4

Physical Science Test Chapter 4

2 or more substances combined, but not chemically joined mixtures
mixtures can be organized by ... ordinary ways
each substance in a mixture keeps ... its own properties
2 or more elements that are chemically joined (stuck together) compounds
compounds must have ... different properties than the substances that make them up
compounds must have bonds broken in order to ... separate the elements
a certain compound always has the same ...(ex. sodium chloride is NaCl) chemical formula
some compounds exist as ... molecules
a molecule is ... when atoms join by sharing electrons with eachother, they join in ratios
what can show how atoms in a compound are connected? a sketch
bond length the distance between the nuclei of two bonded atoms/the angle formed by 2 bonds to the same atom
does the structure of a compound affect the properties of the compound? yes
strong structures are made of ... bonded ions
high or low melting point?-compounds made of bonded ions have ( ) melting points ex.-salt high
there are 2 main types of bond's between atoms, and which type it is depends on ... its electonegativity
how much an atom attracts electrons in a bond electron electonegativity
one atom steals electrons from another atom ionic bond
opposites ( ) and ( ) together. attract, stick
what do ionic compounds conduct when they are melted or dissolved in water? electricity
ionic compounds stick together in ( ) not as ( ) molecules. they always ( ) eachothers charges. networks, individual, balance
ionic compounds have very ( ) melting points high
two atoms share electrons is called covalent bonds
atoms may share (2 words) of electrons or ( ) than one pair of electrons. one pair, more
O=O is a... double covalent bond (it shares 4 electrons)
H-H is a ... single covalent bond
a triple covalent bond shows ( ) lines 3, it shares 6 electrons
atoms may ( ) we call these polar covalent bonds. not share electrons equally
some covalent bonds have a ( ) or a ( ) charge. these are called ( ) positive, negative, poly atomic ions
covalent compounds have ( ) melting points than ionic compounds do. lower
we dont hear much about this bond metallic bond
( ) bond is similar yet different from the main 2 types of bond we just talked about(ionic and covalent) metallic
a bond formed by positively charged metal ions in an "ocean" or "soup" of electrons metallic bond
what can slide around in the "soup" of electrons from one nucleus to the next? ions
this type of bonding allows metals to conduct ( ) well. electricity
long molecules made of many smaller molecules bonded together. the smaller molecules that make them up are called monomers.(ex.- cotton, wool, rubber, plastics, DNA) polymers
Created by: darrl