## Search found 20 matches

Sun Jul 30, 2017 6:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Question 11.39
Replies: 3
Views: 351

### Re: Question 11.39

Well you are given this equation at 300 K and as you can see the equation you're given is two equations on the chart 11.2 combined. You can say that they are multiplied into one equation so you would look at both these equations on the chart at 300 and multiply their Kc.
Sun Jul 30, 2017 6:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quadratic formula
Replies: 2
Views: 329

### Re: Quadratic formula

I want to add that you also don't use the number that is less than the initial concentration because once again you might be getting a negative concentration.
Sun Jul 30, 2017 3:57 pm
Forum: Lewis Structures
Topic: Le Chatelier's Principle
Replies: 1
Views: 296

### Le Chatelier's Principle

Can someone please give me a brief explanation of Le Chatelier's principle, I don't understand how increasing or decreasing the pressure/concentration of one molecule will affect the others.
Sat Jul 29, 2017 4:17 pm
Forum: Lewis Acids & Bases
Topic: Chemical Equilibrium [ENDORSED]
Replies: 2
Views: 334

### Chemical Equilibrium[ENDORSED]

When doing an ICE chart and adding or subtracting the X's, do you always subtract the reactant and add to the product?
Sun Jul 23, 2017 6:21 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Covalent and Ionic Bonds
Replies: 1
Views: 236

### Covalent and Ionic Bonds

Can someone please explain the difference between covalent and ionic bonds?
Sun Jul 23, 2017 6:20 pm
Forum: Naming
Topic: Ch.17
Replies: 1
Views: 259

### Re: Ch.17

Well in class he emphasized that the practice problems are what are going to be on the test.
Sat Jul 22, 2017 9:23 pm
Forum: Student Social/Study Group
Topic: Molecular Shapes
Replies: 1
Views: 326

### Molecular Shapes

I have a question on what molecular shapes we are supposed to know because in the course reader we are given 5 different ones but the textbook on pg.109, there are 12 different kinds. Does anyone know which to focus on more?
Fri Jul 21, 2017 3:51 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chapter 3
Replies: 1
Views: 221

### Chapter 3

For Chapter 3 on question 25 we are told to write the chemical formula for the given compounds, are we supposed to know how to do this. Like for example we are given magnesium arsenide, and are told to write it out as Mgsub3 ASsub2.
Sun Jul 16, 2017 3:58 pm
Forum: Trends in The Periodic Table
Topic: 1st and 2nd ionization energy? [ENDORSED]
Replies: 7
Views: 2332

### Re: 1st and 2nd ionization energy?[ENDORSED]

Another small thing to remember about the 2nd ionization energy is that it will always be greater than the 1st for the reasons explained above.
Sun Jul 16, 2017 3:54 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Quick Question about SO4
Replies: 8
Views: 934

### Re: Quick Question about SO4

I believe that the second structure is more stable because you want the least amount of negatives in the formal charge. For example in the first structure you have 4 (-1) formal charges and in the second one you only have 2. If I am wrong please correct me.
Sun Jul 16, 2017 3:50 pm
Forum: Ionic & Covalent Bonds
Topic: Polar vs. nonpolar
Replies: 2
Views: 289

### Re: Polar vs. nonpolar

I am also confused on how to determine polar bonds, can someone also please explain dipoles.
Sat Jul 15, 2017 1:23 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8241
Views: 1437440

### Re: Post All Chemistry Jokes Here

I would make another chemistry joke but all the good ones ARGON.
Sun Jul 09, 2017 2:33 pm
Forum: Student Social/Study Group
Topic: Schrodinger
Replies: 1
Views: 306

### Schrodinger

Can someone please explain Schrodingers Equation please?
Sun Jul 09, 2017 2:29 pm
Forum: Student Social/Study Group
Topic: Thoughts after Test 1?
Replies: 13
Views: 1296

### Re: Thoughts after Test 1?

I realized that I felt so much pressure that I wasn't able to read the questions and interpret them the way I might have understood it. My friend had explained the question to me after the test and I had realized it was easier than I thought.
Sun Jul 09, 2017 2:27 pm
Forum: Student Social/Study Group
Topic: Electron Configuration
Replies: 2
Views: 366

### Electron Configuration

Can someone please reexplain the exception of 4s and 3d
Sun Jul 09, 2017 2:18 pm
Forum: Student Social/Study Group
Topic: De Broglie
Replies: 1
Views: 329

### De Broglie

How do we know if something has measurable wavelike properties like the example on page 52 of the course reader ?
Sun Jul 02, 2017 10:39 am
Forum: Administrative Questions and Class Announcements
Topic: Quantum Question
Replies: 2
Views: 406

### Quantum Question

In the course reader page 48, I understand the worked out problem, but I do not get why the 4.09 x 10^(-19) J goes from negative to positive towards the end.
Sun Jul 02, 2017 10:22 am
Forum: DeBroglie Equation
Topic: Class Quetsion
Replies: 2
Views: 424

### Class Quetsion

In class Dr. Lavelle mentioned 10^(-12)m=pm, 10^(-9)m=nm, and 10^(-3)m=mm. I am confused on what units these are or what they mean exactly. Can someone explain them to me please.
Sun Jul 02, 2017 10:13 am
Forum: DeBroglie Equation
Topic: Textbook Vs the Exams
Replies: 1
Views: 357

### Textbook Vs the Exams

In the textbook there are problems that ask for you to write the equation of a certain reaction, are we supposed to know certain chem equations for the tests or exams?
Sun Jul 02, 2017 10:08 am
Forum: DeBroglie Equation
Topic: Test Questions
Replies: 2
Views: 412

### Test Questions

When I solve problems from the textbook, I am usually off by a decimal, will I get deducted points if that happens in a test?

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