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density
physical property that relates mass to volumemass
(g)volume (mL)
TERM 2
physical change
DEFINITION 2
alter substance without changing composition
TERM 3
chemical change
DEFINITION 3
converts one matter to another through chemical reaction
TERM 4
physical properties
DEFINITION 4
melting point, boiling point, solubility, color
TERM 5
chemical properties
DEFINITION 5
determine how a substance can be converted to another
pure substance
composed of a single component and has constant
composition regardless of size or origin
TERM 7
element
DEFINITION 7
can not be broken into a simpler substance by chemical
reaction
TERM 8
compound
DEFINITION 8
chemically combining two or more elements
TERM 9
mixture
DEFINITION 9
composed of more than one component
composition can vary
can be separated into its components by physical
changes
TERM 10
mega-
DEFINITION 10
million1,000,00010^
nano-
billionth0.000 000 00110^-
TERM 17
one liter
DEFINITION 17
the volume of a 10 cm x 10 cm x 10 cm cube1000 cm^
TERM 18
inexact
number
DEFINITION 18
results from a measurement or an observation
contains some uncertainty
TERM 19
exact
number
DEFINITION 19
something that results from counting or is in a definition
10 fingers
1 foot= 12 inches
TERM 20
when a zero is significant
DEFINITION 20
between 2 non-zero digits 1049
at the end of a number with adecimal point 100.
when a zero is not significant
at the beginning ofa number 0100
at the end of a number that does not have a decimal point
TERM 22
conversion factor
DEFINITION 22
a term that converts a quantity of one unit to a quantity of
another unit
TERM 23
specific gravity
DEFINITION 23
compares the density of a substance with the density of
water at 4 degrees Celsiusdensity of substancedensity of
water
TERM 24
proton
DEFINITION 24
positive charge
TERM 25
neutron
DEFINITION 25
neutral or no charge
number of neutrons
mass number - number of protons
TERM 32
number of electrons
DEFINITION 32
number of protons
TERM 33
atomic weight
DEFINITION 33
weighted average of the mass of the naturally occurring
isotopes of an element (reported in amu)
TERM 34
period
DEFINITION 34
a row horizontal
TERM 35
group
DEFINITION 35
a columnvertical
alkali metals
group 1A
soft and shiny with low melting points
good conductors of heat and electricity
react readily with water to form basic solutions
TERM 37
alkaline earth metals
DEFINITION 37
group 2A
shiny solids
less reactive than alkali metals
TERM 38
valence electrons
DEFINITION 38
an electron in the outermost shell [noble gas configuration]
valence electrons
TERM 39
electron dot symbols
DEFINITION 39
used to show valence electrsons
TERM 40
atomic size
DEFINITION 40
size of atom (nucleus and electrons)
ionization energy _____ across a period of the
periodic table
increases
