## Search found 24 matches

Sat Mar 16, 2019 11:46 pm
Forum: First Order Reactions
Topic: Finding Order of Reactions
Replies: 4
Views: 356

### Re: Finding Order of Reactions

You can choose any rates from the experimental data, as long as all rates you choose are from the same specific trial and not from multiple trials. As long as this is consistent then the value for the rate of consumption will be the same no matter which concentrations you select.
Sat Mar 16, 2019 11:43 pm
Forum: General Rate Laws
Topic: pseudo rate laws
Replies: 4
Views: 411

### Re: pseudo rate laws

See Topic 7B in the 7th edition of the textbook. You would use it when rate laws depend on the concentration of more that one species. Take for example, Rate of consumption of I^{-}=k_{r}[S_{2}O_{8} \^{2-}][I^{-}] Since the persulfate concentration will is nearly the same at the end of the reaction ...
Sat Mar 16, 2019 1:20 pm
Forum: Administrative Questions and Class Announcements
Topic: LYNDON'S PORK RAMEN REVIEW
Replies: 37
Views: 5512

### Re: LYNDON'S PORK RAMEN REVIEW

Thank you for all the help over the last two quarters, best of luck on your own finals!
Sat Feb 23, 2019 11:46 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Electropositive Metals
Replies: 1
Views: 126

### Electropositive Metals

I Understand the difference between electropositive and electronegative elements, yet can someone explain how this concept applies to metals and salts? Thank you.
Sat Feb 23, 2019 11:43 pm
Forum: Van't Hoff Equation
Topic: Galvanic/Voltaic Cell
Replies: 2
Views: 146

### Galvanic/Voltaic Cell

Just wondering if these types of cells can be used interchangeably. Are there any differences between the two cells? Thank you.
Sat Feb 23, 2019 11:38 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Calculations for Gibbs free energy
Replies: 2
Views: 157

### Calculations for Gibbs free energy

I understand how to solve the equation $Delta G=\Delta H-T\Delta S$. But for other methods when given the number of moles can someone explain how to solve these/what is the reasoning behind it? Thank you.
Wed Feb 13, 2019 9:42 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Problem #4 on Test #1
Replies: 1
Views: 108

### Problem #4 on Test #1

Question: At -100C, Kp =0.13 for the reaction CO2(s) <> CO2(g). What is the equilibrium partial pressure of CO2(g) at -100C?

I would appreciate if someone could explain to me the answer, thank you.
Sun Feb 10, 2019 1:44 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Midterm #1 14B
Replies: 17
Views: 1086

### Midterm #1 14B

I have been trying to search for the practice midterm by Lyndon Bui but am unable to find it. Can anyone post the link or direct me to it? Thank you.
Sun Dec 09, 2018 1:36 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 3
Views: 210

### Polydentate

What does it mean for a ligand to be polydentate? And how can you identify a polydentate?
Sun Dec 09, 2018 1:17 am
Forum: Conjugate Acids & Bases
Topic: Stability of Conjugate Base
Replies: 6
Views: 2202

### Stability of Conjugate Base

How does the stability of a conjugate base, determine if an acid or base is stronger or weaker?
Sun Dec 09, 2018 1:13 am
Forum: Lewis Acids & Bases
Topic: Acids and Bases affecting the pH
Replies: 1
Views: 263

### Acids and Bases affecting the pH

How would the pH of a solution differ if you used a strong acid vs. a weak acid?
Sun Dec 09, 2018 1:13 am
Forum: Lewis Acids & Bases
Topic: Acids and Bases affecting the pH
Replies: 1
Views: 269

### Acids and Bases affecting the pH

How would the pH of a solution differ if you used a strong acid vs. a weak acid?
Sun Nov 11, 2018 11:59 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs Nonpolar
Replies: 5
Views: 351

### Re: Polar vs Nonpolar

If the atoms have different electronegativities, this results in unequal sharing of electrons, which is polar. If the electronegativity difference equals zero, there is no unequal sharing and the molecule is nonpolar.
Sun Nov 11, 2018 11:44 am
Forum: Electronegativity
Topic: difference in electronegativity
Replies: 5
Views: 282

### Re: difference in electronegativity

There are periodic tables that include an electronegative charge. Yet, for this class, I believe you do not need to know the exact charge, just know the general trend of electronegativity.
Sun Nov 11, 2018 11:14 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR?
Replies: 9
Views: 456

### Re: VSEPR?

How would you apply VSEPR to determine the shape of various types of molecules? I know what the acronym stands for, but am unsure how to apply it.
Sat Nov 03, 2018 4:58 pm
Forum: Lewis Structures
Topic: Lewis Acids and Bases
Replies: 5
Views: 185

### Lewis Acids and Bases

How do you identify Lewis Acids and Bases and how do they form coordinate covalent bonds?
Sat Nov 03, 2018 4:43 pm
Forum: SI Units, Unit Conversions
Topic: Molar Mass to Kg
Replies: 6
Views: 833

### Re: Molar Mass to Kg

Make sure you divide since the units of Avogadro's number is mol^-1. If you multiply it will be incorrect.
Sat Nov 03, 2018 4:26 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Do we need to know electron configurations for atoms with f orbitals?
Replies: 1
Views: 81

### Re: Do we need to know electron configurations for atoms with f orbitals?

I do not think so, the outline states just s, p and d.
Sat Oct 27, 2018 8:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Is homework graded for correctness or completeness?
Replies: 5
Views: 410

### Re: Is homework graded for correctness or completeness?

It is graded for completeness. You can always work to solve the problem on your own and then check the solution manual to ensure your answer is correct.
Sat Oct 27, 2018 7:38 pm
Forum: Ionic & Covalent Bonds
Topic: Lowest Ionization Energy [ENDORSED]
Replies: 7
Views: 364

### Lowest Ionization Energy[ENDORSED]

For drawing Lewis structures, how do you know which atom in the molecule has the lowest ionization energy?
Tue Oct 23, 2018 8:22 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Test 2 and Homework Problems
Replies: 6
Views: 348

### Re: Test 2 and Homework Problems

Since Test 2 is suppose to be all quantum material up to and including quantum numbers, does this mean electron material such as configurations and electron affinity will not be on the test?
Sun Oct 07, 2018 8:12 pm
Forum: Limiting Reactant Calculations
Topic: Theoretical Yield
Replies: 7
Views: 432

### Re: Theoretical Yield

As if there were not enough reasons already, simply when doing experiments you can always have solutions that are not properly mixed or finished being mixed. Leading to a nonhomogeneous solution.
Sun Oct 07, 2018 8:05 pm
Forum: Balancing Chemical Reactions
Topic: Where to start [ENDORSED]
Replies: 10
Views: 872

### Re: Where to start[ENDORSED]

I always try to balance the molecule that appears least first. These problems tend to be trial and error as you try to balance them.
Sun Oct 07, 2018 5:21 pm
Forum: Significant Figures
Topic: Multiplication/Division and Addition/Subtraction in Sig Figs
Replies: 2
Views: 131

### Re: Multiplication/Division and Addition/Subtraction in Sig Figs

On another note, make sure to wait until you get your final answer to round sig figs. In other words, do not round your sig figs in the middle of your problem.

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