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35 Cards in this Set

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what does specific heat do?
identifies an unknown material
what is a calorimeter?
insulated container that prevents heat exchange from the process occuring inside the countainer and around it outside.
heat change of a substance (q)=
M x C x Change in T
what is c (specific heat) for water?
4.18 j/(g)(degrees c)
to record a thermogram, what do you press after main menu?
F2 - Temperature
F1 - Temperature vs. Time
what is y min and max for determining the calorimeter constant for a styrofoam cup calorimeter?
15-75
what is the equation for deteriming the calorimeter constant for the calorimeter?
[mass of warm water x C x change in temp of warm water] - [mass of room temp water x C x change in temp of water]
density = ?
mass / volume
equation for finding the volume of a...
cube:
rectangle solid:
sphere:
cylinder:
cube: L3
rectangle solid: L x W x H
sphere: 4/3(3.14)(r3)
cylinder: (3.14)(r2)(L)
how do you determine the density of an irregularly shaped object?
use the displacement of water or some other liquid
does lower specific heat mean the object absorbs heat more slowly of quickly?
slowly
what is the equation for determining the specific heat of an unknown metal given the calorimeter constant?
[mass of room temp water x C x change in temp of water] + [calorimeter constant x change in temp of water] / [mass of solid x change in temp of solid]
how do you identify an unknown metal nitrate solution via titration with NaOH
1. obtain 20 mL of unknown.
2. pipet 10 mL into a 250 mL
beaker and add about 90 mL
water.
3. fill cleaned pipet with 50
mL NaOH.
how do you preform titrataion using the measurenet workstation?
F3 - pH/mV
F2 - pH/volume
calibrate
F1
Display
when done using measurenent, how do you save files?
file options
F3
enter 3 digit code
Enter
molarity = ?
mols / L
molar ratio = ?
mol NaOH / mol metal soln
how do you distinguish an unknown metal nitrate solution via precipitation with NaOH?
molar ratio
how do you prepare the five standard solutions from the one concentrated standard soltuion when determining the concentration of an unknown metal solution by absorbance spectrascopy?
(m1)(v1)=(m2)(v2)
solving for v1
on measurenet, how do you preform absorbance spectrascopy?
F5 spectroscopy
F2 absorbance
for absorbance spectrascopy, what does y = and what is your min/max?
y = absorbance
max = 2
min = 0
for absorbance spectrascopy, what does x = and what is your min/max?
x = wavelength
min and max = leave how it is.
for absorbance spectrascopy, what is your blank solution?
water
for absorbance spectrascopy, what is used to zero? to reference?
zero = black block
reference = water
volume should be reported to the what mL?
0.001
will a higher or lower specific heat attain a higher equilibrium (final temperature)
higher
how do you find lamba max when preforming absorbance spectrascopy?
look at the three beer lambert plots given. it will be the peak that is around 1 or less for absorbance. use the highest peak that's the best (least blurry)
how do you find the absorbance needed when preforming absorbance spectrascopy?
plug absorbance reading at lamda max intot equaiton for line (given), solving for x.
how do you determine whether an unknown compound is ionic, polar covalent or nonpolar covalent?
ionic: use LE light. if it lights up, it's ionic.
polar: will dissolve in water (and not hexane)
nonpolar: will dissolve in hexane (and not water)
when you standardize an unknown acid via titration, what goes in the buret?
the acid
how do you determine the concentration of the unknown acid (or base)?
take grams of standaard
divide by molar mass
multiply by mol-to-mol ratio (2 humps=2 to 1 ratio, 1 hump=1 to 1 ratio)
then divide by equivilance point (in L)
how do you find the quivilance point?
what you start with - wht you finish with
when standardizingn an unknown base via titration, what goes in the buret?
the base
when determining the % mass in an unknown compound in a mixture via titration, what goes in the buret?
the unknown compound
how do you find the % mass in an unknown compound in a mixture via titration?
equivalence point (in L)
multiply by molarity (given)
now you have moles.
multiply moles by molecular weigth (should be given)
divide teh weight that you started with
multiply by 100%