# Shared Flashcard Set

## Details

General Chemistry - Lab Final
Review for Gen Chem. Laboratory Final
51
Chemistry
11/29/2015

Term
 percent error
Definition
 (average value - true value)---------------------------- x 100% true value
Term
 coefficient of variation
Definition
 (standard deviation)--------------------- x 100% mean(not S.D.'s mean)
Term
 percent difference
Definition
 |(Value 1 - Value 2)|---------------------- x 100%| Avg. of values |
Term
 standard deviation (excel)
Definition
 formulas > more functions > statistical > stdev.s
Term
 measurements related to systematic error
Definition
 absolute error and percent error
Term
 measurements related to random error
Definition
 standard deviation and coefficient of variation
Term
 measurements related to accuracy
Definition
 absolute error and percent error
Term
 measurements related to precision
Definition
 standard deviation and coefficient of variation
Term
 define accuracy
Definition
 closeness of measured value to the true value, correctness
Term
 define precision
Definition
 closeness of measured values to each other, reproducibility
Term
 calculate moles of a substance given grams
Definition
 # grams / molecular mass of compound
Term
 calculate grams of substance given moles
Definition
 multiply # moles by molecular mass of compound
Term
 calculation for concentration
Definition
 molarity, n (mols of substance) / volume of substance in liters or PPM
Term
 calculate parts per million (PPM)
Definition
 mass of substance in Mg / volume in liters
Term
 density
Definition
 mass / volume
Term
 one amp = ? coulombs
Definition
 one amp = one coulomb of charge per second
Term
 charge of an electron
Definition
 -1.602 x 10 ^ -19 coulombs
Term
 40 amp circuit how many coulombs per second?
Definition
 40
Term
 to find the total charge passed through a circuit
Definition
 multiply time (in seconds) by # of amps passed through
Term
 to find # of electrons passed through a circuit
Definition
 multiply # coulombs by the charge of an electron (750C x [1/1.602x10^-19])
Term
 how to type 3.09 x 10^19 into excel
Definition
 3.09e+19
Term
Definition
 6.022x10^23
Term
 percent yield
Definition
 actual yield / theoretical yield x 100%
Term
 Qrxn
Definition
 - C calorimeter X Temperature change
Term
 Delta H mol (enthalpy change per mol of fuel burned)
Definition
 Q rxn / n burned (mols fuel burned)
Term
 Delta H G (enthalpy change per gram of fuel burned)
Definition
 1) delta H mol / molecular mass of fuel2) Q rxn / mass burned
Term
 how to calculate energy of one photon
Definition
 e = hc / lambda
Term
 H represents what
Definition
 plancks constant, 6.626x10^-34 joules per second
Term
 C represents what
Definition
 speed of light, 2.9979x10^8 meters per second
Term
 lambda represents what
Definition
 wavelength in nanometers (must be converted to meters in energy equation)
Term
 how to convert from nanometers to meters
Definition
 multiply the nanometers by (10^-9)
Term
 molarity
Definition
 moles of substance / volume in liters
Term
 parts per million
Definition
 mass of substance in mg / volume in liters
Term
 molarity dilution calculation
Definition
 m1v1 = m2v2
Term
 bond angle for linear
Definition
 180
Term
 bond angle for trigonal planar
Definition
 120
Term
 bond angle for tetrahedral
Definition
 109.5
Term
 bond angle for trigonal bypyramidal
Definition
 90 and 120
Term
 bond angle for octahedral
Definition
 90
Term
 bond angle for 2 groups of electrons
Definition
 180
Term
 bond angle for 3 groups of electrons
Definition
 120
Term
 bond angle for 4 groups of electrons
Definition
 109.5
Term
 define hydrocarbons vapor pressure and solubility
Definition
 high vapor pressure, insoluble
Term
 define esters vapor pressure and solubility
Definition
 high vapor pressure, high to moderate solubility
Term
 define alcohols vapor pressure and solubility
Definition
 low vapor pressure, high to moderate solubility
Term
 molecular mass equation for chapter 8
Definition
 (Mgas)(R = .0821)(Tbath)/(ambient pressure in atm)(Vbottle volume of gas)
Term
 how to find mass of gas
Definition
 Mincrease (avg) + M correction
Term
 equation to find M correction
Definition
 (MM air 29g/mol)(Sample VP atm)(Vbottle in L)/(.0821)(room temp kelvin)
Term
 how to determine formula of ester or alcohol
Definition
 divide its molecular mass by 15, round to nearest whole number, for esters 2 of these numbers will be O atoms, for alcohols one will be an O atom
Term
 typical vapor pressure of ester and hydrocarbon
Definition
 >20torr
Term
 typical vapor pressure of alcohol
Definition
 <10torr
Supporting users have an ad free experience!