Search found 30 matches

by Christopher Wendland 4F
Sat Dec 08, 2018 10:16 pm
Forum: Bronsted Acids & Bases
Topic: Base Strength
Replies: 4
Views: 135

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.
by Christopher Wendland 4F
Sat Dec 08, 2018 10:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 117

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...
by Christopher Wendland 4F
Sat Dec 08, 2018 10:10 pm
Forum: Identifying Acidic & Basic Salts
Topic: Weak bases and weak acids
Replies: 1
Views: 109

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.
by Christopher Wendland 4F
Sat Dec 08, 2018 10:08 pm
Forum: Lewis Acids & Bases
Topic: Lewis Acid
Replies: 6
Views: 93

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.
by Christopher Wendland 4F
Sat Dec 08, 2018 10:07 pm
Forum: Identifying Acidic & Basic Salts
Topic: What are salts...
Replies: 4
Views: 135

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.
by Christopher Wendland 4F
Sat Dec 08, 2018 10:03 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: A X5 E
Replies: 6
Views: 160

Re: A X5 E

The one lone pair makes it square pyramidal.
by Christopher Wendland 4F
Wed Nov 28, 2018 4:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarizability
Replies: 2
Views: 69

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.
by Christopher Wendland 4F
Wed Nov 28, 2018 4:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar and Non-Polar
Replies: 2
Views: 60

Re: Polar and Non-Polar

See if it is symmetrical by figuring out the VSEPR shape.
by Christopher Wendland 4F
Sat Nov 24, 2018 1:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polarity
Replies: 3
Views: 81

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.
by Christopher Wendland 4F
Sat Nov 24, 2018 1:26 pm
Forum: Bond Lengths & Energies
Topic: Determining Higher Boiling Points
Replies: 2
Views: 82

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...
by Christopher Wendland 4F
Sat Nov 24, 2018 1:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw bond angles
Replies: 3
Views: 108

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...
by Christopher Wendland 4F
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: 480

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.
by Christopher Wendland 4F
Tue Nov 13, 2018 4:14 pm
Forum: Ionic & Covalent Bonds
Topic: Which way to put greater than/less than signs
Replies: 2
Views: 95

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
by Christopher Wendland 4F
Tue Nov 13, 2018 11:55 am
Forum: Electronegativity
Topic: Electronegativity Graph
Replies: 4
Views: 133

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.
by Christopher Wendland 4F
Tue Nov 13, 2018 11:45 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Hybrid vs. Molecular Orbitals
Replies: 3
Views: 110

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.
by Christopher Wendland 4F
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: 60

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.
by Christopher Wendland 4F
Tue Nov 13, 2018 11:26 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Tetrahedral versus Trigonal Pyramidal
Replies: 3
Views: 71

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.
by Christopher Wendland 4F
Tue Nov 13, 2018 11:20 am
Forum: Dipole Moments
Topic: Van der Waals
Replies: 4
Views: 97

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.
by Christopher Wendland 4F
Tue Nov 13, 2018 11:14 am
Forum: Administrative Questions and Class Announcements
Topic: 14B structure? [ENDORSED]
Replies: 2
Views: 99

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.
by Christopher Wendland 4F
Tue Nov 13, 2018 11:10 am
Forum: Bond Lengths & Energies
Topic: finding bond length
Replies: 6
Views: 112

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...
by Christopher Wendland 4F
Sun Nov 04, 2018 9:16 am
Forum: Octet Exceptions
Topic: Adding a Double bond or leaving a lone pair [ENDORSED]
Replies: 3
Views: 94

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.
by Christopher Wendland 4F
Sun Nov 04, 2018 9:14 am
Forum: Ionic & Covalent Bonds
Topic: covalent bonds
Replies: 3
Views: 81

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.
by Christopher Wendland 4F
Sun Nov 04, 2018 9:12 am
Forum: Ionic & Covalent Bonds
Topic: Ionic character [ENDORSED]
Replies: 5
Views: 91

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
by Christopher Wendland 4F
Sat Oct 13, 2018 5:02 pm
Forum: Properties of Light
Topic: Measurable wavelengths
Replies: 5
Views: 64

Re: Measurable wavelengths

The smallest wavelength that we can measure is 10^-18 m.
by Christopher Wendland 4F
Sat Oct 13, 2018 4:59 pm
Forum: Properties of Light
Topic: light frequency
Replies: 3
Views: 49

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.
by Christopher Wendland 4F
Sat Oct 13, 2018 4:54 pm
Forum: DeBroglie Equation
Topic: WaveLike Properties
Replies: 3
Views: 55

Re: WaveLike Properties

Only particles or other quantum scaled things have wavelike properties.
by Christopher Wendland 4F
Fri Oct 05, 2018 2:01 pm
Forum: Limiting Reactant Calculations
Topic: M15 problem (6th edition)
Replies: 2
Views: 55

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...
by Christopher Wendland 4F
Fri Oct 05, 2018 2:00 pm
Forum: Empirical & Molecular Formulas
Topic: When to double moles
Replies: 13
Views: 194

Re: When to double moles

If it is less than .1 away from a whole number we are able to round it.
by Christopher Wendland 4F
Fri Oct 05, 2018 1:43 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: MOLARITY
Replies: 13
Views: 450

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.

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