CHM 2045 L UF Lab Exam questions
with 100% complete solutions
2025/2026
Percent error formula - ANS ✔✔calculated value minus expected value l value divided by
expected value times 100
Find density given unknown concentration graphy y=mx+b - ANS ✔✔y is density and x is mass %
so sub value of y to find x
Density formula - ANS ✔✔mass/ volume
Hydrate definition - ANS ✔✔crystalline compound in which one or more water molecules
combine with formula unit of walt that loses water above 100c
% water= mass water lost/ mass hydrate times 100 - ANS ✔✔
Mass water lost= - ANS ✔✔unheated mass minus mass after heating
PH2= - ANS ✔✔ptotal - pvapor
Ptotal= patm-pfluid - ANS ✔✔
h1d1=h2d2 - ANS ✔✔
p1v1/t1=P2V2/T2 - ANS ✔✔
, Molarity= moles/volume in L - ANS ✔✔
Q= - ANS ✔✔mCgDelta T Q is the symbol for heat transfer, m is the mass of the substance, and
ΔT is the change in temperature. The symbol c stands for specific heat and depends on the
material and phase
Lowest energy color - ANS ✔✔red
Smallest electronic transitions - ANS ✔✔lowest atomic #
Highest energy color is - ANS ✔✔violet
molality= - ANS ✔✔moles/kg
Calculate i= - ANS ✔✔mass particles/ moles compound dissolved
Accuracy - - ANS ✔✔A description of how close a measurement is to the true value of the
quantity measured.
Precision - - ANS ✔✔a measure of how close a series of measurements are to one another
sig figs for addition and subtraction - - ANS ✔✔the result has the same number of decimal
places as the measurement with the fewest decimal places
sig figs for multiplication and division - - ANS ✔✔the result has the same number of sig figs as
the term with the least number of sig figs
with 100% complete solutions
2025/2026
Percent error formula - ANS ✔✔calculated value minus expected value l value divided by
expected value times 100
Find density given unknown concentration graphy y=mx+b - ANS ✔✔y is density and x is mass %
so sub value of y to find x
Density formula - ANS ✔✔mass/ volume
Hydrate definition - ANS ✔✔crystalline compound in which one or more water molecules
combine with formula unit of walt that loses water above 100c
% water= mass water lost/ mass hydrate times 100 - ANS ✔✔
Mass water lost= - ANS ✔✔unheated mass minus mass after heating
PH2= - ANS ✔✔ptotal - pvapor
Ptotal= patm-pfluid - ANS ✔✔
h1d1=h2d2 - ANS ✔✔
p1v1/t1=P2V2/T2 - ANS ✔✔
, Molarity= moles/volume in L - ANS ✔✔
Q= - ANS ✔✔mCgDelta T Q is the symbol for heat transfer, m is the mass of the substance, and
ΔT is the change in temperature. The symbol c stands for specific heat and depends on the
material and phase
Lowest energy color - ANS ✔✔red
Smallest electronic transitions - ANS ✔✔lowest atomic #
Highest energy color is - ANS ✔✔violet
molality= - ANS ✔✔moles/kg
Calculate i= - ANS ✔✔mass particles/ moles compound dissolved
Accuracy - - ANS ✔✔A description of how close a measurement is to the true value of the
quantity measured.
Precision - - ANS ✔✔a measure of how close a series of measurements are to one another
sig figs for addition and subtraction - - ANS ✔✔the result has the same number of decimal
places as the measurement with the fewest decimal places
sig figs for multiplication and division - - ANS ✔✔the result has the same number of sig figs as
the term with the least number of sig figs
