Sorry if this a silly question, but I'm a bit rusty since I took chem 14A in the summer, not the previous quarter.
How do I know whether the standard state of certain reactants and products is liquid, solid, or gas?
Take for example, F2's standard state is gas.
Search found 13 matches
- Sat Jan 14, 2017 11:25 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard States of Elements
- Replies: 1
- Views: 670
- Sun Jul 24, 2016 12:19 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: What is 1/K? [ENDORSED]
- Replies: 4
- Views: 1512
What is 1/K? [ENDORSED]
What does 1/K (equilibrium constant) mean?
What would a question ask when requiring us to give 1/K?
What would a question ask when requiring us to give 1/K?
- Wed Jul 20, 2016 3:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Concepts [ENDORSED]
- Replies: 1
- Views: 552
Concepts [ENDORSED]
I'm having a hard time understanding the concepts of this section. Could someone summarize the basic concepts for me? In particular -What is K, Q, 1 -When a reaction has a tendency to form products or reactants in relation to K, Q, 1 -Why does the composition of the reaction mixture remain constant ...
- Fri Jul 15, 2016 4:04 pm
- Forum: Hybridization
- Topic: Homework 4.45 [ENDORSED]
- Replies: 1
- Views: 489
Homework 4.45 [ENDORSED]
"Describe the structure of CH 2 O in terms of hybrid orbitals, bond angles, and sigma and pi bonds." I was able to correctly determine that the hybrid orbital was sp 2 and the bond angle 120. What is a quick and effective way to determine the amount of sigma and pi bonds and how can I unde...
- Fri Jul 15, 2016 8:49 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar and Non-Polar [ENDORSED]
- Replies: 1
- Views: 523
Polar and Non-Polar [ENDORSED]
I am confused with how to determine if a molecule is polar or non-polar, and then determining which molecule has the largest dipole moment in two polar molecules. Homework questions I tend to be having trouble with have this format.... 1. Is this molecule polar or non-polar? 2. Which of the two pola...
- Sat Jul 09, 2016 2:05 pm
- Forum: Lewis Structures
- Topic: Confused with octet rule?
- Replies: 1
- Views: 559
Confused with octet rule?
I'm confused as sometimes I see the central atom overfilling or sometimes not meeting the octet rule. How do I know which elements defy the octet rule?
- Sun Jul 03, 2016 11:25 am
- Forum: Properties of Light
- Topic: Quiz True or False Questions [ENDORSED]
- Replies: 1
- Views: 624
Quiz True or False Questions [ENDORSED]
Does anyone have any recollection of the true/false question in the center, the one involving wavelengths? I can't remember what it asked.
- Sun Jul 03, 2016 11:21 am
- Forum: Properties of Light
- Topic: Nature of light [ENDORSED]
- Replies: 3
- Views: 715
Nature of light [ENDORSED]
Could someone please elaborate on the nature of light as electromagnetic radiation and as a stream of photons in the simplest terms possible? I'm a bit confused on the conceptual level but I completely understand how to do calculations involving the photoelectric effect.
- Wed Jun 29, 2016 4:31 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Math Question [ENDORSED]
- Replies: 1
- Views: 798
Math Question [ENDORSED]
Suppose a sample of methanol (CH 3 OH) contains 1.53 x 10 24 carbon atoms. How many moles of carbon are there in the sample? So this question is relatively simple, 1.53 x 10 24 divided by Avogadro's number (6.0221 x 10 23 ) to obtain the answer. However I have trouble dividing numbers with exponents...
- Wed Jun 29, 2016 4:01 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Quiz Grades?
- Replies: 2
- Views: 516
Quiz Grades?
I'm confused as to how our workbook may increase our grades. If I were to get say a 30/40 on the quiz and 35/40 on the second quiz, would a fully completed and correct workbook make the first quiz grade a 40/40?
- Mon Jun 27, 2016 3:10 pm
- Forum: *Shrodinger Equation
- Topic: Chapter 1 Reading
- Replies: 1
- Views: 553
Chapter 1 Reading
Should I skip the reading "1.7 Wave Functions and Energy Levels" since it is not mentioned in the Quantum World outline? It is completely on the schrodinger equation and calculating the energies of a particle in a box. Will this be tested on? Is this crucial as a foundation to what we migh...
- Thu Jun 23, 2016 9:17 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Fundamentals E [ENDORSED]
- Replies: 1
- Views: 516
Fundamentals E [ENDORSED]
E.23 How many moles of H2O in 2.00g of NA2CO3 x 10H2O
First thing I did was add all of the masses up, and I came to 286g.
2.00g divided by 286 g, I got .007 moles. The text book says .069 moles. Where did I go wrong? Please help.
First thing I did was add all of the masses up, and I came to 286g.
2.00g divided by 286 g, I got .007 moles. The text book says .069 moles. Where did I go wrong? Please help.
- Thu Jun 23, 2016 4:21 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Fundamentals E Homework [ENDORSED]
- Replies: 2
- Views: 711
Fundamentals E Homework [ENDORSED]
E.1 asks..."Suppose you were able to string together 1.00 mol Ag atoms, each of radius 144 pm, into one of these fibers by encapsulating them in carbon nanotubes. How long would the fiber extend?" I approached the problem by turning moles into amount of atoms by multiplying by Avogadro's n...