## Search found 20 matches

Sun Dec 10, 2017 12:28 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Quadratic Equation
Replies: 1
Views: 203

### Re: Quadratic Equation

The quadratic equation is needed to solve values involving equilibrium concentrations. If the kPa value is smaller than 10^-3, then the value of x is negilible, hence not requiring the quadratic formula, most of the time.
Sun Dec 10, 2017 12:26 am
Forum: Bronsted Acids & Bases
Topic: strength of acid
Replies: 1
Views: 210

### Re: strength of acid

Binary acids do follow a trend of those with high electronegativity being the stronger acid. However, when comparing strengths of acids, like those involving halogens, the larger the atomic radius of the halogen, the stronger the acid. That is because the longer bond allows for more complete dissoci...
Sun Dec 10, 2017 12:22 am
Forum: Lewis Acids & Bases
Topic: Determine Lewis Acid
Replies: 13
Views: 843

### Re: Determine Lewis Acid

Lewis acids and Bronsted-Lowry acids both become negatively charged.
Sun Dec 10, 2017 12:20 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculating pH from pka
Replies: 3
Views: 346

### Re: Calculating pH from pka

pKa is the acid dissociation constant for a specific weak acid, so from doing an ICE table, you could find the amount of H3O+ found if also given an initial value of the weak acid. You can then find the pH with the concentration of H3O+ calculated.
Sun Dec 10, 2017 12:17 am
Forum: Dipole Moments
Topic: Dipole Occurence
Replies: 4
Views: 438

### Re: Dipole Occurence

It depends on the difference in electronegativity between the atoms.
For example, for HCl, Chlorine's high electronegativity will draw the e-'s towards the atom and away from the Hydrogen.
Sat Dec 09, 2017 8:34 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 12.45 Help
Replies: 1
Views: 327

### Re: 12.45 Help

I think the book was trying to expand our applications of organic molecules and how the longer the chain of an organic molecule is, the more basic of a character it has.
Sat Dec 09, 2017 8:24 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Question From Test 4
Replies: 1
Views: 211

### Re: Question From Test 4

> Br CO
> I /
> Ni-Br
> I \
> Br CO
Sat Dec 09, 2017 8:19 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Monodentate vs others
Replies: 1
Views: 250

### Re: Monodentate vs others

Draw out the lewis structure and each lone pair in the molecule is a location of a coordinate covalent bond with a ligand. The prefix is dependent on the number of lone pairs.
Sun Nov 12, 2017 4:18 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Calculating Formal Charge
Replies: 4
Views: 421

### Re: Calculating Formal Charge

To simplify the equation, it is easier to subtract the number of electrons(dots) and the number of bonds(lines) from the number of valence electrons, per element.
Sun Nov 12, 2017 3:06 pm
Forum: Lewis Structures
Topic: Lewis Structures of Radicals [ENDORSED]
Replies: 2
Views: 259

### Re: Lewis Structures of Radicals[ENDORSED]

I think its best to place the electron on the most electronegative element, which would make the formal charge calculated to zero for the overall molecule.
Sat Nov 04, 2017 9:16 pm
Forum: Lewis Structures
Topic: S2F2 Isomers Question
Replies: 1
Views: 887

### Re: S2F2 Isomers Question

From my knowledge of chemistry, one way of drawing a resonance structure differently, when there's a presence of the double bonds, is to create a cis- or trans- resonance isomer, which would be due to the presence of the double bond, which would prevent rotation.
Sat Nov 04, 2017 8:58 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths [ENDORSED]
Replies: 8
Views: 734

### Re: Bond Lengths[ENDORSED]

"Multiple bonds are shorter than single bonds between the same two elements, because the additional bonding electrons attract the nuclei more strongly and pull the atoms closer together" (96). So basically, the more bonds there are, the shorter the bonds are.
Fri Oct 27, 2017 7:05 pm
Forum: Resonance Structures
Topic: Resonance in SO4
Replies: 5
Views: 479

### Re: Resonance in SO4

Sulfur is not able to hold 16 valence electrons in its valence shell.
Fri Oct 27, 2017 6:33 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Electron-electron Repulsion
Replies: 1
Views: 6771

### Re: Electron-electron Repulsion

"Because the electron–electron repulsions work against the pull of the nucleus" and since the size of the atomic radius is larger as you go down a group, there are larger repulsions as the atomic radius gets larger and the valence electrons are further away from the nucleus (43).
Fri Oct 27, 2017 6:15 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Equal or greater than or equal to sign?
Replies: 3
Views: 246

### Re: Equal or greater than or equal to sign?

The product of the uncertainties of momentum and position are greater than or equal to half of h bar (17).
Fri Oct 27, 2017 6:07 pm
Forum: Resonance Structures
Topic: Formal charge question
Replies: 3
Views: 353

### Re: Formal charge question

Having a low formal charge would mean that it is most likely to appear in comparison to other resonance structures. "A low formal charge indicates that an atom has undergone only a small redistribution of electrons relative to the free atom. The structure with formal charges closest to zero typ...
Fri Oct 27, 2017 5:57 pm
Forum: Lewis Structures
Topic: Lengths of Bonds
Replies: 2
Views: 368

### Re: Lengths of Bonds

A triple bond would be shorter than a single bond "because the additional bonding electrons attract the nuclei more strongly and pull the atoms closer together" (96). There should be only one structure for C2H2 because the there could only be one triple bond between the carbons. If there w...
Mon Oct 23, 2017 2:32 pm
Forum: Trends in The Periodic Table
Topic: Size of Atomic Radii
Replies: 3
Views: 294

### Size of Atomic Radii

Why does the size of the atomic radii of elements on the periodic table increase down a group and decrease across a period? Is it because of the pull of the overall nuclear charge that the electrons have in each shell that are drawn to the protons in the nucleus or just the orbital shells in general?
Sat Oct 07, 2017 3:24 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.17 [ENDORSED]
Replies: 6
Views: 1616

### Re: G.17[ENDORSED]

ClaireHW wrote:Does the CuSO4 bond with the H2O to form the new compound or do they become more connected due to being in an aqueous solution?
(Claire Woolson 3J)

The CuSO4 become a hydrate due to the presence of the H2O molecules, bonded with the CuSO4.
Sat Oct 07, 2017 2:58 pm
Forum: Balancing Chemical Reactions
Topic: Combustion [ENDORSED]
Replies: 6
Views: 596

### Re: Combustion[ENDORSED]

In a combustion reaction, are the products of H2O and CO2 always in the gas form? Are there any instances in which they would be in liquid form? Also, is combustion always with gaseous 02? Sometimes an incomplete reaction occurs where there is insufficient oxygen in the reaction. The resulting prod...

Go to advanced search