Chem 209 Study guides, Class notes & Summaries
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CHEM 209 Quiz 1 Questions And Answers Graded A+
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Calculate the pH of a 0.10M HOAc (acetic acid) solution. - Answer-pH = -log(.10) = 1 
Calculate the pH of each of the following solutions: 
a. 0.10M HCl 
b. 2.0x10^-4M HNO3 
c. 0.015M NaOH 
d. 12M HCl - Answer-Use equation: pH = -log(molarity) 
a. 1 
b. 3.7 
c. 12.17 
d.-1.1 
Calculate the total number of moles of acid in 33.6 mL of 0.10M HCl and 0.10M H2SO4. - Answer-.00336 
mol each 
Calculate the total number of moles of base in: 
a. 675 mg CaCO3 
b. 135 mg Mg(OH)2 - Answer-a. 0.00674 
b. 0.0...
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chem 209 quiz 3 Questions and Answers(A+ Solution guide)
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1. Draw a block diagram of a GC instrument, labeling all the important components. - Mobile 
Phase Reservoir, Sample Injector, Stationary Phase, Detector, and Read-out 
carrier gas - mobile phase 
In a GC experiment, a student injects 2.0 μL of a 20% ethanol/water solution into the GC. Calculate the 
weight of ethanol that has been injected. (The density of ethanol is 0.789 g/mL at 20° C.) - 0.789 
g/ml -> 0.789 mg/μL 
20% of 2.0 = 0.4 
0.4 μL x 0.789 mg/μL = 0.3156 mg 
In general, how w...
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CHEM 209 Quiz 2 Questions And Answers With Verified Solutions
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Calculate the absorbance A of solutions whose percent transmittance is measures as 5%, 10%, 50%, and 
100%. - Answers-A=-log(T) 
1.3, 1.0, .30, and 0 respectively 
Give the block diagram of a visible spectrophotometer, illustrating the major components of the 
instrument in the correct sequence. - Answers-[Light source] ---many lambdas---> [Monochromator] --- 
one lambda---> [Sample cell] ---I---> [Photodetector] ------> [Readout] 
It is important that Kf for FeSCN2+ has a large valu...
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CHEM 209 Quiz 3 Questions and Answers Solved
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carrier gas -Answer-mobile phase 
In a GC experiment, a student injects 2.0 μL of a 20% ethanol/water solution into the GC. Calculate the 
weight of ethanol that has been injected. (The density of ethanol is 0.789 g/mL at 20° C. -Answer-0.3156 
mg 
In general, why will an increase in operating temperature/mobile phase flow rate cause a given peak to 
have a longer or a shorter retention time? -Answer-faster flow through column 
In general, will an increase in operating temperature/mobile phase...
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Chem Ch. 2 Questions and Answers 100% Pass
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Chem Ch. 2 Questions and Answers 
 
100% Pass 
 
1. What defines ions? 
- A. Particles with a net electrical charge not equal to zero 
- B. Atoms having gained electrons 
- C. Atoms having lost electrons 
- D. All of the above 
 
Explanation: Ions are atoms or molecules that have gained or lost electrons, resulting in a net 
electrical charge. This definition encompasses both positively charged ions (cations) that have 
lost electrons and negatively charged ions (anions) that have gained electr...
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Chem 209 EXAMS BUNDLE-Questions with Correct Answers/ Latest Update/ 100% Pass
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Chem 209 EXAMS BUNDLE-Questions with Correct Answers/ Latest Update/ 100% Pass
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CHEM 209 Quiz #1-Questions with Correct Answers/ Latest Update/ 100% Pass
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What is a back titration? - ️️A titration in which a known excess of titrant is added and 
then the excess is carefully titrated. 
What is the balanced chemical equation for the complete reaction between CO3 2- and HCl? 
Between KHP and NaOH? SHOW THE NET IONIC EQUATIONS. - ️️2HCl(aq) + CO3 2-(aq) 
---> H2O(l) + CO2(g) + 2Cl-(aq) 
2H+(aq) + CO3 2-(aq) ---> H2O(l) + CO2(g) 
KHP(aq) + NaOH(aq) ---> NaKP(aq) + H2O(l) 
KHP(aq) + OH-(aq) ---> KP-(aq) + H2O(l) 
Calculate the total ...
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Chem 209 Quiz 1-Questions with Correct Answers/ Latest Update/ 100% Pass
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What is the Bronstead-Lowry definition of an Acid? - ️️They are proton DONORS! [H+] 
What is the Bronstead-Lowry definition of a Base? - ️️They are proton ACCEPTORS! 
[H+] 
Example/further description of Bronstead-Lowry Acids - ️️These give AwAy protons; 
emphasis on the A's.... "A.P.A." 
Example/further description of Bronstead-Lowery Bases - ️️protons Belong to them, 
they Bring them in... emphasis on the B's.... "P.B.B." 
What is a STRONG Base and Acid? -️️These diss...
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Chem 209 Quiz 2-Questions with Correct Answers/ Latest Update/ 100% Pass
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What is the balanced chemical reaction of Fe3+ with thiocyanate? -️️SCN-(aq) + 
Fe3+(aq) = Fe(SCN)2+(aq) 
Show the equation for Beer's Law and define all the terms (including units) - ️️A=Ebc 
A= Sample's measured absorbance 
E= molar absorptivity at the wavelength used (L/(mol x cm) 
b= width of sample (cm) 
c= sample concentration (M) 
What is the lambda max, how is it determined, and why are absorption measurements such 
as those in this experiment made at this lambda? - ️️Lambd...
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Chem 209 Final Exam-Questions with Correct Answers/ Latest Update/ 100% Pass
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Chemistry - ️️the science dealing with the composition of matter and the changes in 
composition that matter undergoes 
Macroscopic - ️️the overall view 
Microscopic - ️️looking deeper into things 
Scientific Method - ️️involves making observations, formulating hypotheses, and 
performing experiments 
Hypothesis - ️️a tentative explanation of certain facts that provides a basis for further 
experimentation 
Theory - ️️an explanation of the general principles of certain ph...
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