Search found 15 matches

by Richard_4E
Sat Mar 05, 2016 9:43 pm
Forum: *Aldehydes
Topic: Carbonyl Functional Group
Replies: 1
Views: 677

Re: Carbonyl Functional Group

A carbonyl functional group is just a carbon atom double bonded to an oxygen atom. It is a part of many other functional groups like ketone, aldehyde, and carboxylic acid. So yes, aldehydes and ketones are different functional groups that both contain the carbonyl functional group
by Richard_4E
Sat Feb 27, 2016 10:19 pm
Forum: *Cycloalkenes
Topic: Two Benzene Groups attached
Replies: 1
Views: 332

Two Benzene Groups attached

Why is it when 2 benzene groups are attached right next to each other it's called "naphtalene" vs. Di phenyl?
by Richard_4E
Sat Feb 20, 2016 5:23 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Winter 2016 Midterm Question 3&4 D
Replies: 1
Views: 333

Re: Winter 2016 Midterm Question 3&4 D

You would need to identify in other problems which is the system and the surroundings. In this case, the ideal gas is the system since work is being done on it by the surroundings. Delta S total (also known as delta S universe) is equal to the Delta S System + Delta S Surroundings. Since it asked fo...
by Richard_4E
Sat Feb 06, 2016 10:20 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Clarification on Standard Cell Potential
Replies: 1
Views: 289

Re: Clarification on Standard Cell Potential

No the standard cell potential depends on what direction your equation is in. If the equation is being oxidized, you would switch the signs. So if it is Cu --> Cu2+ + 2e-, then the standard cell potential would be negative. Otherwise if it's being reduced, it would retain it's value of 0.34. There s...
by Richard_4E
Sat Jan 30, 2016 10:46 pm
Forum: Balancing Redox Reactions
Topic: Using -OH to Balance
Replies: 2
Views: 437

Re: Using -OH to Balance

You use -OH along with H2O to balance the amount of H+ atoms in basic solution.
by Richard_4E
Sat Jan 23, 2016 6:30 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Practice Quiz 1 2014 problem 9
Replies: 1
Views: 278

Re: Practice Quiz 1 2014 problem 9

I did the problem and get the right sign. Did you try again and check your signs? Delta H should be positive due to the negative signs canceling out. Also, delta H is greater than TdeltaS so delta g should be positive after the reaction. Delta G doesn't always have to be negative. It's negative when...
by Richard_4E
Wed Jan 13, 2016 4:16 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Comparing Molar Heat Capacity
Replies: 1
Views: 302

Comparing Molar Heat Capacity

Why would the additional Oxygen in NO2 compared to NO cause it to have a higher molar heat capacity?
by Richard_4E
Fri Dec 04, 2015 12:21 pm
Forum: Dipole Moments
Topic: How do you find the "largest dipole moment"?
Replies: 6
Views: 71127

Re: How do you find the "largest dipole moment"?

HBr would have a larger dipole moment than HI since as Jamlah said, there's a greater electronegativity difference between H and Br than between H and I. In other words HBr is more polar and Bromine will attract electrons to itself more.
by Richard_4E
Sat Nov 28, 2015 8:31 pm
Forum: Lewis Acids & Bases
Topic: Acids and bases
Replies: 2
Views: 584

Re: Acids and bases

A strong acid must be able to lose the hydrogen ion easily. In addition the weaker or longer the A-H bond is, the easier it is for H20 to remove the H+ and the more acidic something is. For example HI is more acidic than HCl which is more acidic than HF since HI has longer(weaker) bonds than HCl. Al...
by Richard_4E
Tue Nov 17, 2015 10:56 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: How Will Change in Temperature Affect Concentration
Replies: 2
Views: 442

Re: How Will Change in Temperature Affect Concentration

After balancing the equation, you get 2HCl (g) + I2(g) = 2HI (g) + Cl2 (g). Since there are the same number of moles of gas molecules on each side, an increase in pressure makes no difference in the position of equilibrium. For other reactions, increasing the pressure (by decreasing the volume), wil...
by Richard_4E
Fri Nov 13, 2015 9:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant in regards to stability
Replies: 1
Views: 1630

Equilibrium Constant in regards to stability

For example, at 1000k the disassociation of F2 has a larger equilibrium constant than the dissociation of Cl2. How does this let one know that Cl2 is more stable since it has a smaller equilibrium constant?
by Richard_4E
Sat Oct 31, 2015 5:11 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond order of 1/2 and 0
Replies: 1
Views: 6024

Re: Bond order of 1/2 and 0

A bond order of 0 means that since the molecule is very unstable, no bonds will form. Bond orders of .5 usually
mean that there is resonance, multiple possible structures.
by Richard_4E
Fri Oct 23, 2015 4:28 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula in a Combustion Reaction
Replies: 1
Views: 398

Empirical Formula in a Combustion Reaction

For the last quiz 1 prep, Q5, if I am given the mass of the compound burned (6.40g) and the mass of CO2(8.80g) as well as H20(7.20g) produced, is the mass of oxygen relevant? If so, how would I determine the moles of oxygen? Is the compound a hydrocarbon as usual in combustion reactions or does it c...
by Richard_4E
Fri Oct 16, 2015 11:22 pm
Forum: Lewis Structures
Topic: Dots for Lewis Structures
Replies: 2
Views: 1193

Re: Dots for Lewis Structures

The top lewis structure looks more proper as valence electrons repel one another, so they would want to be the maximum distance apart.
You want to draw a lewis structure with the correct angles as a 2d representation of the VESPER Model.
by Richard_4E
Sat Oct 03, 2015 8:15 pm
Forum: Empirical & Molecular Formulas
Topic: Tips on Rounding?
Replies: 3
Views: 577

Re: Tips on Rounding?

It would be inaccurate in my opinion to round 15.287 down to 15 if this is regarding empirical formula. You also round based on the number of significant figures based on the given. It depends on the number which whole number to multiply it with to make it even. Look at the tenth's and hundreth's pl...

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