Search found 30 matches
- Sat Dec 08, 2018 10:16 pm
- Forum: Bronsted Acids & Bases
- Topic: Base Strength
- Replies: 4
- Views: 1863
Re: Base Strength
BrO- is the stronger base, it is on the list of strong bases and that should be memorized. Morphine is a weak base because the hydroxide ion is attached to nitrogen and those are always weak bases.
- Sat Dec 08, 2018 10:14 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 3
- Views: 518
Re: Bond Angles
The A is the central atom and is the origin point, it is just the pivot point and there cant be an angle between it and the atoms attached to it because it is just a line with a point on each end. There is an angle between the two X's because they are both attached to the central atom and form a wed...
- Sat Dec 08, 2018 10:10 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Weak bases and weak acids
- Replies: 1
- Views: 404
Re: Weak bases and weak acids
The salts of weak acids such as F- are electronegative and want to bond with the H+ ions in solution so they would take the H+ from water and the result would be OH- left in the solution.
- Sat Dec 08, 2018 10:08 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis Acid
- Replies: 6
- Views: 646
Re: Lewis Acid
HF is extremely electronegative so it will hold onto its H and not dissolute completely in solution, however Br is lower on the periodic table and less electronegative so it loses its H in water.
- Sat Dec 08, 2018 10:07 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: What are salts...
- Replies: 4
- Views: 682
Re: What are salts...
Salts are just ionic compounds, they change the pH of a solution because they dissolve in water and then the ions from the salts can either bond with H+ or OH- to change the pH.
- Sat Dec 08, 2018 10:03 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: A X5 E
- Replies: 6
- Views: 686
Re: A X5 E
The one lone pair makes it square pyramidal.
- Wed Nov 28, 2018 4:26 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarizability
- Replies: 2
- Views: 340
Re: Polarizability
Polarizability is how easily the electron cloud can be distorted. Larger atoms have more electrons and the electrons are further away from the nucleus meaning they have less effective nuclear charge on them, this means that they are more polarizable.
- Wed Nov 28, 2018 4:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar and Non-Polar
- Replies: 2
- Views: 259
Re: Polar and Non-Polar
See if it is symmetrical by figuring out the VSEPR shape.
- Sat Nov 24, 2018 1:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polarity
- Replies: 3
- Views: 393
Re: polarity
A symmetrical structure can be polar if the atoms on opposite sites are different elements. This would cause an imbalance in the strength of their dipoles and make it polar.
- Sat Nov 24, 2018 1:26 pm
- Forum: Bond Lengths & Energies
- Topic: Determining Higher Boiling Points
- Replies: 2
- Views: 391
Re: Determining Higher Boiling Points
The bond between H and Br might be stronger than the bond between H and I; however, that is not what matters in boiling point, the strength of the intermolecular bonds is what matters. I has more electrons and therefore stronger dispersion forces than HBr so it has stronger bonds between its individ...
- Sat Nov 24, 2018 1:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw bond angles
- Replies: 3
- Views: 419
Re: Seesaw bond angles
The seesaw shaped structure resembles an actual seesaw. There are two 90 degree bond angles (the angle with the part where the people sit and the legs) and then there is a <120 degree angle(the angle between the legs of the seesaw). The angle between the lone pair and the two bonding pairs is greate...
- Tue Nov 13, 2018 4:20 pm
- Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
- Topic: Shape and Boiling Point
- Replies: 12
- Views: 3151
Re: Shape and Boiling Point
Boiling and melting points are directly related to the strength of the intermolecular bonds, the stronger the interaction between molecules, the higher the boiling point.
- Tue Nov 13, 2018 4:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: Which way to put greater than/less than signs
- Replies: 2
- Views: 697
Re: Which way to put greater than/less than signs
If something is increasing in order you put the greater than sign opening towards the one that is larger.
smallest<medium<biggest
smallest<medium<biggest
- Tue Nov 13, 2018 11:55 am
- Forum: Electronegativity
- Topic: Electronegativity Graph
- Replies: 4
- Views: 474
Re: Electronegativity Graph
I believe the electronegativity drop is due to the fact that the element has a half full d orbital and is not trying to obtain electrons to the degree of the other, non-satisfied elements are.
- Tue Nov 13, 2018 11:45 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Hybrid vs. Molecular Orbitals
- Replies: 3
- Views: 2573
Re: Hybrid vs. Molecular Orbitals
The main difference between hybrid orbitals and molecular orbitals is that hybrid orbitals are formed by the interactions of atomic orbitals in the same atom while molecular orbitals are formed by the interactions of atomic orbitals of two different atoms.
- Tue Nov 13, 2018 11:30 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Interaction potential energy equation
- Replies: 3
- Views: 380
Re: Interaction potential energy equation
Ethan Breaux 1J wrote:Sorry didn't mean to repost question. As a note to any moderators: the site would work better if we could still see what we are replying to while we are replying.
If you scroll down a bit while making the reply it shows the entire thread and you can reference the question.
- Tue Nov 13, 2018 11:26 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Tetrahedral versus Trigonal Pyramidal
- Replies: 3
- Views: 391
Re: Tetrahedral versus Trigonal Pyramidal
Lone pairs have a stronger repelling force than normal bonds, therefore the angle becomes about 2.5 degrees less than what it would have been if the lone pair is replaced with a normal bond.
- Tue Nov 13, 2018 11:20 am
- Forum: Dipole Moments
- Topic: Van der Waals
- Replies: 4
- Views: 421
Re: Van der Waals
Van der Waal's forces are intermolecular forces that are only present between molecules of the same composition and if the molecules are close enough together.
- Tue Nov 13, 2018 11:14 am
- Forum: Administrative Questions and Class Announcements
- Topic: 14B structure? [ENDORSED]
- Replies: 2
- Views: 338
Re: 14B structure? [ENDORSED]
According to the Chem 14B website there is the exact same resources for Chem 14B as there are for Chem 14A.
- Tue Nov 13, 2018 11:10 am
- Forum: Bond Lengths & Energies
- Topic: finding bond length
- Replies: 6
- Views: 565
Re: finding bond length
For covalent bonds, bond energies and bond lengths depend on many factors: electron afinities, sizes of atoms involved in the bond, differences in their electronegativity, and the overall structure of the molecule. There is a general trend in that the shorter the bond length, the higher the bond ene...
- Tue Nov 13, 2018 11:03 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: phases caused by interactions
- Replies: 3
- Views: 388
Re: phases caused by interactions
The phase of a molecule depends on the strength of the bonds between molecules.
- Sun Nov 04, 2018 9:16 am
- Forum: Octet Exceptions
- Topic: Adding a Double bond or leaving a lone pair [ENDORSED]
- Replies: 3
- Views: 415
Re: Adding a Double bond or leaving a lone pair [ENDORSED]
Base it off of formal charge. Whatever formation leaves the most electronegative atom with the charge is the best formation.
- Sun Nov 04, 2018 9:14 am
- Forum: Ionic & Covalent Bonds
- Topic: covalent bonds
- Replies: 3
- Views: 442
Re: covalent bonds
Not all of the valence electrons bond in every situation so the number of valence electrons is not equal to the number of bonds.
- Sun Nov 04, 2018 9:12 am
- Forum: Ionic & Covalent Bonds
- Topic: Ionic character [ENDORSED]
- Replies: 5
- Views: 634
Re: Ionic character [ENDORSED]
F is way more electronegative than C and H is only a bit less electronegative than C so the difference is greater between C and F
- Sat Oct 13, 2018 5:02 pm
- Forum: Properties of Light
- Topic: Measurable wavelengths
- Replies: 5
- Views: 501
Re: Measurable wavelengths
The smallest wavelength that we can measure is 10^-18 m.
- Sat Oct 13, 2018 4:59 pm
- Forum: Properties of Light
- Topic: light frequency
- Replies: 3
- Views: 157
Re: light frequency
Those bigger spaces are due to the increase in the ionization energy when the electrons are close to the nucleus, the lower energy levels are close to the nucleus and require more energy to remove them from orbit.
- Sat Oct 13, 2018 4:54 pm
- Forum: DeBroglie Equation
- Topic: WaveLike Properties
- Replies: 3
- Views: 175
Re: WaveLike Properties
Only particles or other quantum scaled things have wavelike properties.
- Fri Oct 05, 2018 2:01 pm
- Forum: Limiting Reactant Calculations
- Topic: M15 problem (6th edition)
- Replies: 2
- Views: 170
Re: M15 problem (6th edition)
For part A it tells you the reaction that occurs in the question, aluminum and chlorine react to form aluminum chloride. Aluminums base oxidation state is +3 so there will be 3 chloride ions with it. Al(s) + 3Cl(g) --> AlCl3(s) For part B we have to find the limiting reactant, this can be done by co...
- Fri Oct 05, 2018 2:00 pm
- Forum: Empirical & Molecular Formulas
- Topic: When to double moles
- Replies: 13
- Views: 1048
Re: When to double moles
If it is less than .1 away from a whole number we are able to round it.
- Fri Oct 05, 2018 1:43 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: MOLARITY
- Replies: 17
- Views: 2138
Re: MOLARITY
Molarity is a measure of the concentration of a chemical species in a solution. It is telling you how many moles of a chemical species there are in a single liter of solution. It can be used to find many different values in relation to a chemical reaction if it is done in a solution.