## Search found 41 matches

Sat Mar 17, 2018 3:04 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Value of n
Replies: 3
Views: 300

### Value of n

How do you determine the value of "n" in the Nernst equation?
Sat Mar 17, 2018 2:30 pm
Forum: General Rate Laws
Topic: 15.49
Replies: 2
Views: 303

### 15.49

How do you write the rate law without knowing the order of the reaction? For example, problem 15.49 in the book.
Sat Mar 17, 2018 1:31 pm
Forum: General Rate Laws
Topic: Finding the rate constant of Reaction
Replies: 2
Views: 324

### Finding the rate constant of Reaction

Given the instantaneous rate of reaction is 2.54x10^-2 mol/(L*s), and the initial mass of each reactant is 1.2g confined to a 750mL vessel, what ia the rate constant of this reaction?
Sat Mar 17, 2018 11:54 am
Forum: General Rate Laws
Topic: Time it takes to reach a certain molarity
Replies: 1
Views: 294

### Time it takes to reach a certain molarity

The rate of AB4 gas consumption in this reaction is constant throughtout and is given as 0.400M/s. If your reaction vessel starts with 0.15M of B2C, how long will it take to get to 30M of B2C? : AB4 + C2 --> AC2 + B2C
Fri Mar 16, 2018 7:01 pm
Forum: Balancing Redox Reactions
Topic: Ranking elements
Replies: 2
Views: 181

### Ranking elements

Can someone please rank these elements in order of increasing oxidizing power/decreasing reducing power to make sure I am thinking about it correctly?:
Mn, Ag, Ti
and: Pb, Al, Cu
Tue Mar 13, 2018 6:42 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Change in Entropy
Replies: 2
Views: 163

### Re: Change in Entropy

So in the case where gibbs free energy is negative, would entropy be positive?
Tue Mar 13, 2018 6:38 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Transferring of Heat
Replies: 4
Views: 366

### Re: Transferring of Heat

Oh okay thank you, this helped alot!
Tue Mar 13, 2018 6:36 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Molar Entropy
Replies: 9
Views: 645

### Re: Molar Entropy

Between a solid and liquid, which substance would have a higher molar entropy? Would a heavy solid have a higher or lower molar entropy than a lighter liquid or vice versa? Would a lighter solid have a higher or lower molar entropy than a heavy liquid?
Sun Mar 11, 2018 8:34 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Molar Entropy
Replies: 9
Views: 645

### Re: Molar Entropy

Also, is the size a more significant factor in determining this than the state that the molecule is in?
Sun Mar 11, 2018 8:30 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Transferring of Heat
Replies: 4
Views: 366

### Re: Transferring of Heat

How is this caused by a warmer temperature because it says that it maintains the same temperature
Sun Mar 11, 2018 5:00 pm
Forum: Balancing Redox Reactions
Topic: Ranking elements
Replies: 8
Views: 548

### Ranking elements

How can you determine the amount of reducing or oxidizing power that an element has compared to other elements so that you can rank them in order of increasing or decreasing power?
Sun Mar 11, 2018 4:54 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Molar Entropy
Replies: 9
Views: 645

### Molar Entropy

Is the size of a molecule significant in determining whether it has a higher molar entropy than another molecule?
Sun Mar 11, 2018 4:50 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Change in Entropy
Replies: 2
Views: 163

### Change in Entropy

What determines whether change in entropy is positive or negative? And what would the signs of the other thermodynamic values be? (i.e gibbs free energy)
Sun Mar 11, 2018 4:47 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Transferring of Heat
Replies: 4
Views: 366

### Transferring of Heat

In the situation that "A ballon filled with gas expands to a larger volume and lower pressure while maintaining the same temperature," how is heat considered to be transferred in the process?
Sun Mar 11, 2018 4:44 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Calculating standard enthalpy [ENDORSED]
Replies: 3
Views: 399

### Calculating standard enthalpy[ENDORSED]

Between the two methods for calculating the change in standard enthalpy (using "products - reactants" or using the provided bond ethalpy values), why don't they result in the same answer?
Sun Mar 11, 2018 4:28 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8011
Views: 1401418

### Re: Post All Chemistry Jokes Here

"OMG! I think I lost one of my neutrons"
"It'll be fine, you can get a new one free of charge!"
Sun Mar 11, 2018 4:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8011
Views: 1401418

### Re: Post All Chemistry Jokes Here

Ar : Don't tell a joke to a noble gas because you'll get no reaction.

Na : Haha, That was sodium funny.

Ne : I slapped my neon that one!
Sun Mar 11, 2018 4:14 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8011
Views: 1401418

### Re: Post All Chemistry Jokes Here

I tried to come up with another corny chemistry joke, but all of the good ones Argon.
Sat Mar 10, 2018 4:39 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: The First Law
Replies: 6
Views: 526

### The First Law

Is the conservation of energy the same as the first law of thermodynamics as stated in the book that "The internal energy of an isolated system is constant?" Or would the definition of the law of conservation of energy be insufficient to define the first law?
Sat Mar 10, 2018 4:30 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: The universe as a thermodynamic system [ENDORSED]
Replies: 3
Views: 316

### The universe as a thermodynamic system[ENDORSED]

Why is the universe considered a closed system?
Sat Mar 10, 2018 4:20 pm
Forum: Balancing Redox Reactions
Topic: Acidic vs. Basic Solutions [ENDORSED]
Replies: 4
Views: 282

### Re: Acidic vs. Basic Solutions[ENDORSED]

Fri Mar 09, 2018 6:53 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: The Daniell Cell [ENDORSED]
Replies: 1
Views: 155

### The Daniell Cell[ENDORSED]

What is the main purpose of the porous wall of the Daniell cell? And how does it achieve this purpose?
Fri Mar 09, 2018 6:39 pm
Forum: Balancing Redox Reactions
Topic: One Reactant
Replies: 2
Views: 184

### Re: One Reactant

Would the single reactant be considered both the oxidizing agent and the reducing agent?
Fri Mar 09, 2018 6:36 pm
Forum: Balancing Redox Reactions
Topic: Acidic vs. Basic Solutions [ENDORSED]
Replies: 4
Views: 282

### Re: Acidic vs. Basic Solutions[ENDORSED]

I'm pretty sure for one of them, the H must be balanced with H20 on one side and OH- on the other but I can't remember which is which.
Fri Mar 09, 2018 6:35 pm
Forum: Balancing Redox Reactions
Topic: Acidic vs. Basic Solutions [ENDORSED]
Replies: 4
Views: 282

### Acidic vs. Basic Solutions[ENDORSED]

What changes when balancing the equation to an acidic reaction vs balancing the equation to a basic solution?
Fri Mar 09, 2018 6:20 pm
Forum: General Rate Laws
Topic: Rate of a Reaction
Replies: 2
Views: 227

### Re: Rate of a Reaction

Thank You, it took me a while but I figured it out!
Wed Mar 07, 2018 1:04 am
Forum: General Rate Laws
Topic: Rate Law
Replies: 2
Views: 158

### Re: Rate Law

I re-read the section and realized that it is due to what order the reaction exhibits, first or second for this problem specifically.
Wed Mar 07, 2018 12:57 am
Forum: General Rate Laws
Topic: Rate Law
Replies: 2
Views: 158

### Rate Law

How is the rate law determined and what contributes to the exponents in them? For example for "2 HI --> H2 + I2 has the rate law k[HI]^2 while "2 N2O5 --> 4 NO2 + O2 has rate law k[N2O5] even though both "HI" and "N2O5" both have a coefficient of 2.
Wed Mar 07, 2018 12:09 am
Forum: General Rate Laws
Topic: Reaction rates
Replies: 3
Views: 207

### Reaction rates

What is the difference between the average rate over a certain period of time and the unique average rate?
Tue Mar 06, 2018 11:59 pm
Forum: General Rate Laws
Topic: Rate of a Reaction
Replies: 2
Views: 227

### Rate of a Reaction

I'm not exactly sure how this problem results in the answer "1.72 (mmol H2)/L*h". : "The average rate of the reaction N2(g) --> 3 H2(g) S 2 NH3(g) over a certain period is reported as 1.15 (mmol NH3)!L"1!h"1. (a) What is the average rate over the same period in terms of the ...
Sat Dec 09, 2017 4:19 pm
Forum: Sigma & Pi Bonds
Topic: Triple Bond
Replies: 2
Views: 253

### Triple Bond

If there is a triple bond in a molecule, does that mean there will be one sigma bond and two pi bonds?
Sat Dec 09, 2017 4:17 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Seesaw
Replies: 2
Views: 317

### Seesaw

What does the conjugate seesaw refer to?
Sun Nov 26, 2017 10:34 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Gibbs Free Energy [ENDORSED]
Replies: 1
Views: 160

### Gibbs Free Energy[ENDORSED]

How are you suppose to find the value of the standard Gibbs free energy of a reaction?
Sat Nov 18, 2017 12:14 pm
Forum: Bond Lengths & Energies
Topic: Bond Order
Replies: 2
Views: 318

### Bond Order

What is the overall purpose of bond order besides indicating the amount of bonds that exist between two atoms?
Sat Nov 18, 2017 12:13 pm
Forum: Bond Lengths & Energies
Topic: Bond length
Replies: 2
Views: 217

### Bond length

When a molecule has a resonance structure, for example, two double bonds and one single bond, is the overall bond length a length that is closer to the length of a double bond and in between the length of the two?
Sun Nov 05, 2017 6:16 pm
Forum: Lewis Structures
Topic: Carbon as a Central atom
Replies: 1
Views: 115

### Carbon as a Central atom

Why is carbon always a central atom?
Sun Nov 05, 2017 12:12 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Finding the Formal Charge
Replies: 3
Views: 332

### Re: Finding the Formal Charge

If a central atom has a formal charge, then the overall molecule will have an unbalanced charge and be more unstable than if it did not have a formal charge.
Mon Oct 23, 2017 5:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar and Nonpolar
Replies: 3
Views: 398

### Re: Polar and Nonpolar

A polar or non-polar bond is also only formed through covalent bonding because of the fact that the ions are sharing electrons, making them able to have a partial negative or positive charge. Ionic bonding wont create polar or non-polar ions since they will have full charges.
Mon Oct 23, 2017 5:02 pm
Forum: Properties of Electrons
Topic: Rydberg Equation [ENDORSED]
Replies: 6
Views: 551

### Re: Rydberg Equation[ENDORSED]

If the problem says that it went from n=4 to n=2, does that mean 2 is the final? Or is 4 the final since it is the higher energy level?
Sat Oct 07, 2017 1:20 pm
Forum: Balancing Chemical Reactions
Topic: Limiting Reactant [ENDORSED]
Replies: 2
Views: 336

### Re: Limiting Reactant[ENDORSED]

If both reactants are present in the same number of moles in the reaction, then there is considered to be no limiting reactant at all.
Sat Oct 07, 2017 12:44 pm
Forum: Limiting Reactant Calculations
Topic: Finding Excess Reactant [ENDORSED]
Replies: 2
Views: 238

### Re: Finding Excess Reactant[ENDORSED]

In order to find which reactant is the excess and which is the limiting reactant, you first need to calculate the number of moles there are of each reactant in the reaction. Keeping the stoichiometric coefficients in mind, the reactant with more moles present is in excess while the lesser one is the...