Search found 25 matches
- Sun Dec 10, 2017 10:52 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q [ENDORSED]
- Replies: 7
- Views: 1148
Re: Q [ENDORSED]
Q can be used to compare to K in terms of seeing if a reaction is at equilibrium or not.
- Sat Dec 09, 2017 11:04 am
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Difference between % calculations
- Replies: 2
- Views: 401
Difference between % calculations
What is the difference between deprotonation and protonation percentage? and what do the elements within the equation represent?
- Thu Dec 07, 2017 3:03 pm
- Forum: Ideal Gases
- Topic: R constant in PV=nRT
- Replies: 2
- Views: 651
R constant in PV=nRT
Will the value of R constant be given to us?
- Sat Dec 02, 2017 10:03 pm
- Forum: Hybridization
- Topic: Lone Pairs in Hybridization
- Replies: 4
- Views: 735
Re: Lone Pairs in Hybridization
It is important to take into account everything around the central atom. For example, the number of bonds and lone pairs. Knowing what the central atom is surrounded by helps with the hybridization of the compound.
- Sat Dec 02, 2017 10:01 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentates
- Replies: 1
- Views: 413
Polydentates
How are you able to tell if a compound is mono-, bi-, tri-, etc. dentate just by looking at the name of the compound? (example: NH2CH2CH2NH2)
- Mon Nov 27, 2017 1:27 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Solids and Liquids
- Replies: 3
- Views: 591
Re: Solids and Liquids
Solids and liquids are not included in the K constant because they do not affect the reactant amount at equilibrium. Therefore, they are disregarded and kept at a value of 1.
- Sun Nov 26, 2017 11:39 pm
- Forum: Biological Examples
- Topic: Memorization of compounds
- Replies: 5
- Views: 1006
Memorization of compounds
In the book, the naming of certain compounds was included in a chart of Chapter 17. Would it be helpful to memorize the names of certain compounds for Test4?
- Sat Nov 25, 2017 4:19 pm
- Forum: Hybridization
- Topic: General Hybridization
- Replies: 3
- Views: 703
Re: General Hybridization
I found this simple video to help visual the concept of hybridization and the idea behind sigma and pi bonds. Very short video that helped me learn a little bit more.
https://www.youtube.com/watch?v=Kb0mxAMHnfE
https://www.youtube.com/watch?v=Kb0mxAMHnfE
- Fri Nov 24, 2017 3:31 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Electronegativity
- Replies: 3
- Views: 585
Electronegativity
Does electronegativity have anything to do with VESPR models and if a molecule is polar or non-polar? Like, can we look at a periodic table and decide if a molecule is polar due to the elements included in it?
- Mon Nov 20, 2017 12:20 pm
- Forum: Hybridization
- Topic: Polar/nonpolar [ENDORSED]
- Replies: 14
- Views: 2706
Re: Polar/nonpolar [ENDORSED]
Polar has a pull in a certain direction due to electronegativity and nonpolar means that there is no pull due to a balance between elements.
- Sun Nov 19, 2017 4:21 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3653624
Re: Post All Chemistry Jokes Here
Two chemists go into a bar. The first one Jim says "I think I'll have an H2O." The second one Bob says "I think I'll have an H2O too"... and then Bob died.
- Sun Nov 12, 2017 5:37 pm
- Forum: Lewis Structures
- Topic: Radicals
- Replies: 3
- Views: 597
Re: Radicals
The easiest way to determine if a substance is a radical is by adding the total number of valence electrons in the compound. If there is an even number it is NOT a radical, if it has an odd number it IS a radical. For example in HCl there are a total number of 8 valence electrons meaning that it is ...
- Sun Nov 12, 2017 5:32 pm
- Forum: Resonance Structures
- Topic: Determining Resonance Structures
- Replies: 3
- Views: 695
Re: Determining Resonance Structures
The number of resonance structures is not necessarily given in any other type of way than writing out all possible structures until you have no other ways of writing it. Even though it can be a pain to write them all out, it allows you to not only find how many resonance structures there are, but ad...
- Sun Nov 12, 2017 5:28 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 8
- Views: 1120
Re: Formal Charge
When comparing the formal charges of structures of a compound, it is clear that the structure with a formal charge closest to zero is the most stable. To calculate the formal charge it is easiest by taking the elements number of valence electrons subtracted by number of bonds and additionally subtra...
- Wed Nov 01, 2017 4:16 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Valence electrons [ENDORSED]
- Replies: 7
- Views: 2599
Re: Valence electrons [ENDORSED]
The 4s block is where the outermost electrons are located (valence electrons) rather than the 3d block. When you write out the electron configuration for Magnesium, for example, the electron configuration is [Arg] 4s^2 3d^5 where the valence electrons are located in 4s with 2 valence electrons. I ho...
- Wed Nov 01, 2017 4:12 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius
- Replies: 4
- Views: 731
Re: Atomic Radius
The trend of atomic radius on the periodic table is that as you go from left to right along the period, the atomic radius gets smaller. On the other hand, as you move down a group on the periodic table, the atomic radius gets larger. Therefore, He has the smallest atomic radius and Fr has the larges...
- Sun Oct 29, 2017 8:33 am
- Forum: Trends in The Periodic Table
- Topic: Two Special Elements in Periodic Table
- Replies: 3
- Views: 587
Two Special Elements in Periodic Table
What are the two elements in the periodic table that were unique in the d-block? Cr and __? and why were they different again?
- Thu Oct 26, 2017 6:18 pm
- Forum: Ionic & Covalent Bonds
- Topic: Cation vs Anion
- Replies: 4
- Views: 2797
Re: Cation vs Anion
Think of cations as positive by the letter "t" for a "+" sign, and then anions are just the opposite (so "-" negative sign).
- Thu Oct 26, 2017 6:16 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg Module #23?
- Replies: 4
- Views: 733
Re: Heisenberg Module #23?
For this question I received the answer 5.0 x 10^-39 after calculation, however, the online module marked it wrong. I don't believe it is a positive exponent, but the other negative is too small in comparison to what I calculated. Any help?
- Mon Oct 23, 2017 1:48 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Module Assessements
- Replies: 1
- Views: 369
Module Assessements
Will there be any modules posted about orbitals or electron configuration?
- Wed Oct 18, 2017 10:46 pm
- Forum: Photoelectric Effect
- Topic: 1.33 Part A
- Replies: 4
- Views: 643
Re: 1.33 Part A
I ran into this situation as well. I found it helpful to write all of the given information with their variables and then apply to the equation that yields your desired answer. Since you are trying to determine wavelength the Ke formula wouldn't yield a wavelength value, so therefore you would use d...
- Wed Oct 11, 2017 2:48 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3653624
Re: Post All Chemistry Jokes Here
Making bad chem jokes because all of them Argon.
- Wed Oct 11, 2017 2:39 pm
- Forum: Properties of Light
- Topic: Speed of Light [ENDORSED]
- Replies: 8
- Views: 1278
Re: Speed of Light [ENDORSED]
I think that it would be better to use 2.998x10^8 as the speed of light in order to get a more precise and accurate answer. However, using 3.00x10^8 won't dramatically affect your answer.
- Fri Oct 06, 2017 10:14 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant info [ENDORSED]
- Replies: 6
- Views: 1056
Re: Limiting Reactant info [ENDORSED]
The limiting reactant is easiest to understand if you think about it as the first thing that "runs out" in terms of number of moles. When comparing the necessary amount of moles for the reaction, the one reactant that limits the product mass is the one that is used up/runs out completely.
- Thu Oct 05, 2017 9:43 am
- Forum: Balancing Chemical Reactions
- Topic: Example H.1
- Replies: 3
- Views: 891
Re: Example H.1
When balancing a chemical equation, each side of the reaction needs to have an equal amount of stoichiometric coefficients. Therefore, sometimes the need for fractions is required in order to create the equal amount on both sides. However, fractions are not whole numbers so you would need to multipl...