CHEMISTRY COMMUNITY

Fran L 1J

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?

Fran L 1J

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?

Fran L 1J

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 ...

Fran L 1J

I'm having alkynes of fun with organic chemistry, if you know what amine! :)

Fran L 1J

The -yl suffix is used for substituent groups derived from an alkane (so all single bonds).

Fran L 1J

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...

Fran L 1J

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.

Fran L 1J

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...

Fran L 1J

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 ...

Fran L 1J

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 -...

Fran L 1J

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...

CHEMISTRY COMMUNITY

Search found 11 matches

2015 Final #9A

Re: Cv and Cp

Cv and Cp

Re: Chemistry Jokes

Re: Substituent -yl ending

Practice Midterm Hvap Question

Constant Temperature Clarification

Cell Potential Example in Notes

Change in entropy when both temperature and volume change

Positive and Negative Work Values

Heat Transfer