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35 Cards in this Set
- Front
- Back
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what does specific heat do?
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identifies an unknown material
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what is a calorimeter?
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insulated container that prevents heat exchange from the process occuring inside the countainer and around it outside.
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heat change of a substance (q)=
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M x C x Change in T
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what is c (specific heat) for water?
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4.18 j/(g)(degrees c)
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to record a thermogram, what do you press after main menu?
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F2 - Temperature
F1 - Temperature vs. Time |
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what is y min and max for determining the calorimeter constant for a styrofoam cup calorimeter?
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15-75
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what is the equation for deteriming the calorimeter constant for the calorimeter?
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[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]
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density = ?
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mass / volume
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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) |
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how do you determine the density of an irregularly shaped object?
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use the displacement of water or some other liquid
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does lower specific heat mean the object absorbs heat more slowly of quickly?
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slowly
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what is the equation for determining the specific heat of an unknown metal given the calorimeter constant?
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[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]
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how do you identify an unknown metal nitrate solution via titration with NaOH
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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. |
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how do you preform titrataion using the measurenet workstation?
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F3 - pH/mV
F2 - pH/volume calibrate F1 Display |
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when done using measurenent, how do you save files?
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file options
F3 enter 3 digit code Enter |
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molarity = ?
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mols / L
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molar ratio = ?
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mol NaOH / mol metal soln
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how do you distinguish an unknown metal nitrate solution via precipitation with NaOH?
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molar ratio
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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?
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(m1)(v1)=(m2)(v2)
solving for v1 |
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on measurenet, how do you preform absorbance spectrascopy?
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F5 spectroscopy
F2 absorbance |
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for absorbance spectrascopy, what does y = and what is your min/max?
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y = absorbance
max = 2 min = 0 |
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for absorbance spectrascopy, what does x = and what is your min/max?
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x = wavelength
min and max = leave how it is. |
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for absorbance spectrascopy, what is your blank solution?
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water
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for absorbance spectrascopy, what is used to zero? to reference?
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zero = black block
reference = water |
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volume should be reported to the what mL?
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0.001
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will a higher or lower specific heat attain a higher equilibrium (final temperature)
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higher
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how do you find lamba max when preforming absorbance spectrascopy?
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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)
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how do you find the absorbance needed when preforming absorbance spectrascopy?
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plug absorbance reading at lamda max intot equaiton for line (given), solving for x.
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how do you determine whether an unknown compound is ionic, polar covalent or nonpolar covalent?
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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) |
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when you standardize an unknown acid via titration, what goes in the buret?
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the acid
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how do you determine the concentration of the unknown acid (or base)?
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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) |
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how do you find the quivilance point?
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what you start with - wht you finish with
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when standardizingn an unknown base via titration, what goes in the buret?
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the base
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when determining the % mass in an unknown compound in a mixture via titration, what goes in the buret?
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the unknown compound
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how do you find the % mass in an unknown compound in a mixture via titration?
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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% |
