Search found 10 matches

by Ariana_Kermani_2G
Thu Mar 16, 2017 2:26 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018539

Re: Post All Chemistry Jokes Here

Chemist on the phone
by Ariana_Kermani_2G
Thu Mar 09, 2017 11:26 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018539

Re: Post All Chemistry Jokes Here

The Periodic Table as seen by an Organic Chemist
by Ariana_Kermani_2G
Wed Mar 01, 2017 1:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7606
Views: 1018539

Re: Post All Chemistry Jokes Here

Why did the bear dissolve in water?

He was a POLAR bear!
by Ariana_Kermani_2G
Mon Feb 20, 2017 11:24 am
Forum: General Rate Laws
Topic: Ch 15 Exercise 3a
Replies: 1
Views: 283

Ch 15 Exercise 3a

In 20.s, the concentration of nitrogen dioxide, NO2, decreases from 450 mmol/L to 320 mmol/L in the reaction 2NO2\rightarrow 2NO+O2 (a) Determine the rate of reaction of NO2 Why is the correct answer 6.5 mmol/L x sec and not -6.5 mmol/L x sec? Shouldn't the rate of reaction be negative because NO2 i...
by Ariana_Kermani_2G
Tue Feb 14, 2017 9:58 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Ch 8 Exercise 41
Replies: 1
Views: 208

Ch 8 Exercise 41

A 50.0g ice cube at 0.0 degrees Celsius is added to a glass containing 400.0g of water at 45.0 degrees Celsius. What is the final temperature of the system? Assume that no heat has been lost to the surroundings. Why do we use this equation to solve the problem? And why are the equations set equal to...
by Ariana_Kermani_2G
Wed Feb 08, 2017 9:56 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Ch 14 Exercise 43
Replies: 1
Views: 253

Ch 14 Exercise 43

A tin electrode in 0.015M Sn(NO3)2 (aq) is connected to a hydrogen electrode in which the pressure of H2 is 1.0 bar. If the cell potential is 0.061 V at 25 degrees Celsius, what is the pH of the electrolyte at the hydrogen electrode? Which equation are we supposed to use to solve this problem? Thanks!
by Ariana_Kermani_2G
Wed Feb 01, 2017 11:28 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Equation Explanation
Replies: 1
Views: 197

Equation Explanation

Does the equation delta S=q/T only apply to ideal gases? Or does it apply to any isothermal, reversible process?

Also, are there any differences between the equations delta S=q/T and delta S=q(rev)/T?

Thanks!
by Ariana_Kermani_2G
Wed Jan 25, 2017 4:54 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Ch 8 Exercise 107
Replies: 2
Views: 241

Ch 8 Exercise 107

A person of average mass burns about 30 KJ/minute playing tennis. Find the time you would have to spend playing tennis to burn up the energy in a 2.0 oz serving of cheese, which has a specific enthalpy of combustion of 17.0 KJ/gram. What is the difference between specific enthalpy and specific entha...
by Ariana_Kermani_2G
Thu Jan 19, 2017 4:10 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Ch 8 Exercise 77
Replies: 3
Views: 414

Ch 8 Exercise 77

8.77) Benzene is more stable and less reactive than would be predicted from its Kekule structures. Use the mean bond enthalpies in Table 8.7 to calculate the lowering in molar energy when resonance is allowed between the Kekule structures of benzene. What is a Kekule structure and what effect does r...
by Ariana_Kermani_2G
Wed Jan 11, 2017 6:08 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Ch.8 Exercise 31
Replies: 2
Views: 251

Ch.8 Exercise 31

Calculate the heat released by 5.025g of Kr(g) at 0.400 atm as it cools from 97.6 degrees Celsius to 25.0 degrees Celsius at (a) constant pressure and (b) constant volume. Assume that krypton behaves as an ideal gas. What are the equations used to solve this problem and why do we need to use two dif...

Go to advanced search