stamin up
a mole is equal to ___ representative particles
6.02 x 1023
does water always evaporate?
no
the dissolved particles in a solution are the ___
solute
a ___ is a subtance that speeds up the reaction but is not used up in the reaction
catalyst
molarity and molaity are represented by what in equations?
M and m
the energy an object has because of its motion is called ___
kinetic energy
define molar mass
the mass of a mole of an element
an arrow with a "triangle" indicates that ___ is supplied to the reaction
heat
what is the equation for molarity?
moles of solute/liters of solution
what is molality's equation?
moles of solute/kilogram of solvent
___ are tow or more different molecular forms of the same element in the same physical state
allotropes
sublimation occurs in solids with the vapor pressures that exceed atmospheric pressure at or near ___
room temp
during a reaction, the reaction occurs until the ___ is used up, however the ___ is not completeley used up
limiting and excess reagent
STP stands for ___
standard temperature and pressure
the SI unit for pressure is the ___
pascal
a ___ is a transparent fusion product of inorganic substances that have cooled to a rigid stale withour crystallizing
glass
the calculation of quantities in chemical reactions is a subject of chemistry called ___
stoichiometry
the equation of boyles law is
P1 x V1=P2 x V2
the kf value of water is (kf is oC/m)
a. 1-2
b. 0-1
c. 2-3
d- 5-7
a
what is the formula for percent lead?
actual yield/theoretical yield x100%
Na2B4O7 . 10H2O
in dry air, the partial pressure is ___ kpa
a. 78.2
b. 79.1
c. 80.3
d. 83.1
b
brownian motion was first observed by robert brown who was a ___
a. chemist
b. firefighter
c. cardiologist
d. botonist
d
the scottish chemist thomas graham studied rates of effusion during the 18_0s
4
what is the dispersed phase and dispersion medium of whipped cream?
gas and liquid