chemistry

ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS AND ANSWERS A+ GRADED. BUY Quality Materials! Potentiometry an analytical method in which an electric potential difference (voltage) is measured 1. measurement of ion activity from the electric potential of an ion at an electrode surface 2. Msmt of potential difference between two electrodes of a galvanic cell at zero current Redox titrations and electrode potential -Reduction (adding e-) occurs at cathode (E+) -Oxidation (removing e-) ...

ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS AND ANSWERS A+ GRADED. BUY Quality Materials! E relative (|x1-x(true)|)/x(true) *100 standard deviation sqrt((x1-x)^(2)+(x2-x)^(2))/(n-1) relative standard deviation (s/x(mean))*100 relative uncertainty (abs uncertainty)/measured value How are vol pipets calibrated? For last drop to not be forced out TC to contain TD to deliver Tolerance max permissible deviation of measured value propagation of uncertainty add or sub sqrt(x^(2...

ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS AND ANSWERS A+ GRADED. BUY Quality Materials! how do you calculate dilution factor? (volume of sample + volume of diluent)/(volume of sample) how do you calculate absorbance with the beer lambert law? A=ebc where e=molar absorptivity (1/Mcm) b= pathlengh (cm) c=concentration (M) who discovered the Beer Lambert Law? Pierre Bouguer, Johann Lambert, and August Beer, respectively Absorbance also equals -log of what? transmittance what mater...

ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS AND ANSWERS A+ GRADED. BUY Quality Materials! In a titration experiment, the change of indicator color corresponds to the: endpoint This is the value of the equilibrium constant (at 25 C) of the reaction involved in the titration of strong acid with a strong base: 1*10^14 HNO3 solution was standarized by titrating with 0.4541 g of tris(hydroxymethyl)aminomethane (FM=121.14). A 35.37 ml volume of the titrant was needed for complete titration. ...

ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS AND ANSWERS A+ GRADED. BUY Quality Materials! Why are standard solution of reductants used less often than their oxidant counterparts? not stable in air The Karl Fischer titration method is used for the determination of... water What is the purpose of an auxiliary redox agent? to convert all analyte into one oxidation state Permanganate aqueous solutions will change concentration over time because permanganate reacts with... water A reduc...

ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS AND ANSWERS A+ GRADED. BUY Quality Materials! Qualitative establishes the chemical identity or property Quantitative

ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS AND ANSWERS A+ GRADED. BUY Quality Materials! buoyancy correction m=(m'(1-(air density/weight density)))/(1-(air density/object density)) Absorbance -log(transmittance) Relative uncertainty= absolute uncertainty/magnitude of measurement 68% of measurements in a Gaussian Curve will lie between the mean-1 and the mean+1 mean= true value +-time*standard deviation T-test Case 1 measure sample of known composition T-test case 2 compare...

ATOMS, IONS, AND COMPOUNDS QUESTIONS AND ANSWERS.Buy Quality Materials! Positive charge. Proton Negative charge. Electron Neutral charge. Neutron

6. SHAPES OF MOLECULES AND INTERMOLECULAR FORCES QUESTIONS AND ANSWERS.Buy Quality Materials! There are x bonded electron pairs and y lone electron pairs. Electron pairs repel each other. Lone electron pairs are more repulsive than bonded electron pairs. Molecular Shapes 4 BP 0 LP 109.5' Tetrahedral 3 BP 1 LP 107' Pyramidal

PRACTICAL SKILLS IN CHEMISTRY QUESTIONS AND ANSWERS.Buy Quality Materials! Orange precipitate. What is the positive result for Brady's reagent? Aldehydes and ketones. What functional groups will Brady's reagent give a positive result for? 2,4-dinitrophenylhydrazone. What is the name of the product that gives the precipitate with Brady's reagent? Filter and recrystallise to purify. Find the melting point. Compare against a database to identify. After producing 2,4-DNP, how ...