Search found 11 matches

by Fran L 1J
Sat Mar 12, 2016 3:35 pm
Forum: *Cycloalkanes
Topic: 2015 Final #9A
Replies: 1
Views: 325

2015 Final #9A

For 2015 Final #9A, why is the cycloheptyl the substituent while the propanol is the main chain when the cycloheptyl has more carbons? Is it because the alcohol takes priority?
by Fran L 1J
Thu Mar 10, 2016 10:53 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cv and Cp
Replies: 4
Views: 661

Re: Cv and Cp

Sorry I didn't specify, I mean in a situation with an ideal gas without a given specific heat capacity. Would we use Cp or Cv?
by Fran L 1J
Thu Mar 10, 2016 10:17 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cv and Cp
Replies: 4
Views: 661

Cv and Cp

I know that Cp is used for conditions under constant pressure and Cv is used for conditions under constant volume. However, to calculate change in entropy under changing temperature conditions (with deltaS= nCln(T2/T1)), do we always use Cv since changing temperature means that the pressure changes ...
by Fran L 1J
Mon Mar 07, 2016 3:57 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8037
Views: 1408495

Re: Chemistry Jokes

I'm having alkynes of fun with organic chemistry, if you know what amine! :)
by Fran L 1J
Fri Feb 26, 2016 9:37 pm
Forum: *Alkanes
Topic: Substituent -yl ending
Replies: 2
Views: 328

Re: Substituent -yl ending

The -yl suffix is used for substituent groups derived from an alkane (so all single bonds).
by Fran L 1J
Tue Feb 09, 2016 8:03 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Practice Midterm Hvap Question
Replies: 1
Views: 234

Practice Midterm Hvap Question

In the 2015 Practice Winter Midterm, Q1A says to "Calculate the heat that must be supplied to a 500.0g copper kettle containing 400.0g of water to raise its temperature from 22.0C to the boiling point of water, 100.0C. Specific heat of Cu= 0.38J/ gC." I understand why we need to add the te...
by Fran L 1J
Sat Feb 06, 2016 4:22 pm
Forum: Calculating Work of Expansion
Topic: Constant Temperature Clarification
Replies: 1
Views: 292

Constant Temperature Clarification

For question 8.93, the question has us calculate the work and standard enthalpy of a reaction of 1.00mol of C6H6 at 25C and 1.00 bar. Since the problem did not indicate any change in temperature, why can't we assume that the reaction is isothermal thereby making dU = 0 and q=-w? Thanks.
by Fran L 1J
Tue Feb 02, 2016 2:38 pm
Forum: Balancing Redox Reactions
Topic: Cell Potential Example in Notes
Replies: 1
Views: 214

Cell Potential Example in Notes

On page 52 of the notes, there is an example showing how to calculate the cell potential of a redox reaction with nitric acid and gold ions in solution. The cell potential value for the nitrate (reduction) equation is given as E= 0.96V and for the gold ion (oxidation) equation as E= -1.50 V. The cal...
by Fran L 1J
Thu Jan 28, 2016 12:06 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Change in entropy when both temperature and volume change
Replies: 1
Views: 399

Change in entropy when both temperature and volume change

There is an example in the book on page 325 (ex 9.5) that wants to calculate the change in entropy of 1.00 mol of O2 that was compressed suddenly from 5.00L to 1.00L, temperature increased from 20.0C to 25.2C. When calculating the change in entropy just for the temperature change, the book uses the ...
by Fran L 1J
Fri Jan 22, 2016 8:44 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Positive and Negative Work Values
Replies: 1
Views: 836

Positive and Negative Work Values

This question was in the book for the self-test 8.5A section: "An automobile engine does 520. kJ of work and loses 220. kJ of energy as heat. What is the change in the internal energy of the engine? Treat the engine, fuel, and exhaust gases as the system." The answer the book provided is -...
by Fran L 1J
Mon Jan 11, 2016 2:55 pm
Forum: Phase Changes & Related Calculations
Topic: Heat Transfer
Replies: 1
Views: 220

Heat Transfer

In the notes, it is specified that "98kJ of heat are required to raise the temperature of some ethanol by 2C." So in order to find the heat capacity for ethanol, we can simply divide the 98kJ by 2. My question is-- why is doesn't it take less heat to heat the ethanol from 1C to 2C? I initi...

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