Chemistry 161 Lab Final
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39 Terms
standard deviation (x meaning avg)
[(x1-x)²+(x2-x)² / n-1 ]^1/2
RSD (rate of SD) (x meaning avg)
(SD/x) x 100
How do you determine the best order from a graph? Whats the answer in the lab?
plots are closest to the central line. First order
Endothermic rxn has an increase in both ______ and ______. (which statement is false: not exo)
temperature, solubility
what is the best indicator for a strong acid and weak base = pH of 5?
methyl orange
NaOH + CaCl2
Ca(OH)2, ppt
x/100 = 3.89/ 5.5 = x. solve for x
70.78
4 percent PVA + cross linking = __________
rigid structures
slime + HCl
break down
slime + borax
PVA
slime + NaOH
Reforms
Zero order on a graph
[A]
first order on a graph
ln[A]
second order on a graph
1/[A]
solubility
max amount of solute that can be dissolved in a given solvent
as temperature increases, solubility _____
increases
exothermic equation
solvent +solute —> solution +heat; heat of sol <0
endothermic
solvent + solute +heat —→ solution; heat of sol >0
PVA + crosslinker =
rigid structures
molality (m), what is the answer in lab?
delta T/ -Kf ; 37
Rate=
K[x]^m[x]^n
find the rate order of
Rate = K[Br][NO]²
a(o)
starting angle of light rotation
a(infinity)
end angle of light rotation
optically active
chiral molecules rotate polarized
polarimeter
device that measures light angle rotations
chiral molecules
meaning their mirror images are not superimposable. these rotate polarized light and are said to be optically active
sucrose is a chiral molecule, meaning…
mirror images are not super imposable
what is the transmittence on the spectrometer
55.5%
what is the formula for absorbance and transmittence as a decimal
-log(T)
10^-absorbance
transmittence as a decimal
write the y=mx+b form of absorbance
y=5833x
Chemical synthesis
the preparation of a compound through 2+ rxns
photochemical rxns
triggered by UV or visible light
how to get concentration with 1 conc and two volumes
M1V1=M2V2
10^-pH =
H+ concentration
strong acid + weak base = ph of _____
less than 7
Chiral molecules mirror images are _____ __________
not superimposable
plane of polarized light =
single wavelength