kilogram
basic unit of mass
solid
definite shape and volume
B2Cl4
what is the formula for diboron tetrachloride
specific heat
the amount of heat needed to raise one gram of a substance by 1degree celcius
matter
anything that has mass and takes up space
chemical change
those characteristic properties of a substance that relate to changes in the comp of the
substance or to its reaction with other substances
significant figures
the non place holding digits in a reported measurement
chemical formula
a representation of a chemical compound
alkali metals
on the periodic table group 1A is
theory
an explanation for observations that withstands peer review
gas
no definite volume or shape
falsifiable
a good hypothesis should be ___ which means that further testing could prove it wrong
BaCl2
what is the ionic formula formed for the compound formed by barium and chlorine
groups
the vertical rows on the periodic table
mass number
the sum of the number of neutrons and protons in an atom is
periods
the horizontal rows on the periodic table
atomic mass
the weighted average of the isotopes of an element
liter
basic unit of volume
heterogenous
a mixture whose properties vary throughout
exponent
in scientific notation the ___ shows how many spaces the decimal place has been moved to
produce the final coefficient
homogenous
mixture whose properties are uniform throughout
temperature
the measure of intensity of energy of the particles in a substance
precision
how close a set of measurements are to eachother
anion
a negatively charged ion is an
liquid
a state of matter that has no shape and a definite volume
type 2 ions
ionic compounds that contain metal atoms that can form sever cations
fahrenheit
the temperature scale where freezing point of water is 32degrees and the boiling point is 212
neutron
subatomic particle with no charge found in the nucleus of an atom
noble gases
on the periodic table, the last group o the right is called the
alkaline earth metals
group 2A
ions
charged particles that form when an atom either gains or loses electrons
meter
basic unit of length
characteristic properties
properties that can be used to identify a substance and distinguish it from other substances
calorie
the energy needed to raise 1 gram of water 1 degree celcius
density
the physical property __ is defined as the mass per unit volume
amu
a unit of mass that in one twelfth of the mass of carbon 12 atom
mole
avagadros number of unit particles
scientific law
a generalized statement about observations that summarizes experimental facts about
nature
metalloids
on the periodic table the elements along the stair step are
protons
the atomic number tells you the number of
hallogens
group second from the right
conversion factor
a ratio of two equivalent quantities using different units
isotopes
atoms of a particular element that have different masses due to having different numbers of
electrons
accuracy
how close a set of measurements are to the true value
formula unit
the basic unity of ionic compounds and the smallest neutral collection of ions
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