Search found 31 matches

by Mallory_Podosin_1H
Thu Dec 06, 2018 12:07 am
Forum: Amphoteric Compounds
Topic: Definition
Replies: 6
Views: 84

Re: Definition

Going off of this - can someone explain how we decide whether to use it as a base or an acid? Do you just have to look at the other reactant?
by Mallory_Podosin_1H
Thu Dec 06, 2018 12:06 am
Forum: Conjugate Acids & Bases
Topic: Clarification of Conjugate Acids and Bases
Replies: 4
Views: 51

Re: Clarification of Conjugate Acids and Bases

In the equation it goes
acid +base --> conjugate base + conjugate acid

each acid creates a conjugate base which is 1 hydrogen less than the acid
each base creates a conjugate acid which is 1 hydrogen more than the base
by Mallory_Podosin_1H
Thu Dec 06, 2018 12:04 am
Forum: Lewis Acids & Bases
Topic: Difference between Lewis and Bronsted
Replies: 5
Views: 69

Re: Difference between Lewis and Bronsted

I think the easiest way to recognize is by the presence of a proton. A molecule cannot be a bronsted acid if it doesn't have a hydrogen.
by Mallory_Podosin_1H
Thu Nov 29, 2018 8:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Formula
Replies: 2
Views: 35

Re: VSEPR Formula

If you see something like AX 3 E, that means that there are three atoms/molecules surrounding a central atom as well as one lone pair, meaning trigonal pyramidal. A represents the central atom, X represents bonded atoms, and E represents lone pairs. The subscripts represent how many of each of these...
by Mallory_Podosin_1H
Thu Nov 29, 2018 8:38 pm
Forum: Hybridization
Topic: Lone Pairs in hybridization
Replies: 3
Views: 44

Re: Lone Pairs in hybridization

yes - count lone pairs in hybridization!
by Mallory_Podosin_1H
Thu Nov 29, 2018 8:34 pm
Forum: Naming
Topic: Transition metal oxidation states
Replies: 3
Views: 32

Re: Transition metal oxidation states

I am pretty sure that it is because of valence electrons, and there are multiple ways to make transition metals stable.
Also - a different oxidation state can make certain molecules neutral and transition metals are the atoms that can change sign most easily...at least that's my understanding.
by Mallory_Podosin_1H
Fri Nov 23, 2018 12:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs on Axial vs. Equatorial Positions
Replies: 2
Views: 39

Re: Lone Pairs on Axial vs. Equatorial Positions

They don't occupy the axial positions because the lone pairs want to repel the atoms more than the 90 degrees that set-up would allow. By putting the lone pairs on two of the three equatorial positions, the lone pairs can repel the atoms more effectively and substantially.
by Mallory_Podosin_1H
Fri Nov 23, 2018 12:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent - Lone Pairs
Replies: 8
Views: 117

Re: Bent - Lone Pairs

Are the angles the same or different whether it is one lone pair or two lone pairs in the bent shape?
edit - oops just saw the post above...
by Mallory_Podosin_1H
Fri Nov 23, 2018 12:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Drawing Structures on Test
Replies: 11
Views: 113

Re: Drawing Structures on Test

Does anyone know if we are expected to be able to draw the structures with the wedges? Or is it just naming the shape?
by Mallory_Podosin_1H
Fri Nov 23, 2018 12:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR RULE 3
Replies: 4
Views: 87

Re: VSEPR RULE 3

I'm not 100% sure but I think the reason that single and double bonds are both considered 1 area of e- density is because for double bonds as well as single bonds, the e- are still in the one same area. VSEPR counts areas of e- density, and a double bond is 1 area of e- density just as single bonds ...
by Mallory_Podosin_1H
Thu Nov 15, 2018 8:41 pm
Forum: Bond Lengths & Energies
Topic: Bond Length and Resonance
Replies: 5
Views: 95

Re: Bond Length and Resonance

Single bonds are longer than triple bonds because they are weaker. I am pretty sure this is because there is less pull on the electrons by the nuclei of the atoms that are bonded, so the bond is easier to break when it is longer. In resonance structures, all the bonds between elements with resonance...
by Mallory_Podosin_1H
Thu Nov 15, 2018 8:37 pm
Forum: Dipole Moments
Topic: Induced-dipole
Replies: 5
Views: 66

Re: Induced-dipole

An example of dipole-induced dipole would be when a molecule with a dipole (HCl for example) gets close to a molecule without a dipole. There will be attraction between the positive of the nonpolar molecule and negative part of the dipole (Cl) (or vice versa) - creating a temporary (induced) dipole ...
by Mallory_Podosin_1H
Thu Nov 15, 2018 8:32 pm
Forum: Dipole Moments
Topic: Induced-Dipole Induced-Dipole
Replies: 5
Views: 198

Re: Induced-Dipole Induced-Dipole

hanna_maillard3B wrote:So van-der waals forces work because of induced-dipole induced dipoles ? Do induced-dipole induced-dipole moments affect any other type of bonding or exclusively van-der waals ?


I am pretty sure that induced dipole - induced dipole and Van der Waals forces are two names for the same thing.
by Mallory_Podosin_1H
Thu Nov 08, 2018 7:06 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent Bonds
Replies: 18
Views: 219

Re: Ionic vs Covalent Bonds

Covalent bonds are associated with the sharing of electrons between two nonmetals while Ionic bonds involve the transfer of electrons between a metal and nonmetal, which involves lattice energy. Ionic bonds are extremely stronger than covalent bonds because of the smaller distance between Ionic bon...
by Mallory_Podosin_1H
Thu Nov 08, 2018 7:00 pm
Forum: Dipole Moments
Topic: Permanent Dipole Moments
Replies: 4
Views: 76

Re: Permanent Dipole Moments

Is there some kind of a cutoff for how to decide whether or not a dipole is permanent?
by Mallory_Podosin_1H
Thu Nov 08, 2018 6:54 pm
Forum: Dipole Moments
Topic: Polar and Nonpolar
Replies: 7
Views: 101

Re: Polar and Nonpolar

Kind of an extension of this question - so the only way to have a nonpolar covalent bond would be if the electronegativity is the same meaning the same element?
by Mallory_Podosin_1H
Thu Nov 01, 2018 5:20 pm
Forum: Resonance Structures
Topic: Purpose of Resonance Hybrids
Replies: 4
Views: 51

Purpose of Resonance Hybrids

I am confused on what resonance hybrids are for. Generally and specifically the Benzene Resonance hybrid...so does it only apply to benzene? And also - are there other resonance hybrids?
by Mallory_Podosin_1H
Thu Nov 01, 2018 5:16 pm
Forum: Lewis Structures
Topic: central atoms
Replies: 8
Views: 119

Re: central atoms

Usually (maybe always??) the atom with the lower ionization energy will also have the lower electronegativity so I guess the answer would be both
by Mallory_Podosin_1H
Thu Nov 01, 2018 5:12 pm
Forum: Electronegativity
Topic: Periodic Trends
Replies: 10
Views: 176

Re: Periodic Trends

For Ionization energy, electron affinity, and electronegativity it Decreases Down and increases across
For atomic radius I just remember that its the other way around
by Mallory_Podosin_1H
Thu Oct 25, 2018 9:40 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Spectral Lines and Series
Replies: 3
Views: 87

Re: Spectral Lines and Series

Spectral lines show that wavelengths are emitted only at certain frequencies. Then by looking at those specific frequencies, you can figure out what the element is because every element has a unique set of spectral lines (wavelengths).
by Mallory_Podosin_1H
Thu Oct 25, 2018 9:37 pm
Forum: Einstein Equation
Topic: De Broglie's
Replies: 4
Views: 100

Re: De Broglie's

Often it can be the mass of an electron. Just use the mass of whatever the question asks. Also another trick could be to use the mass of whatever has the velocity.
by Mallory_Podosin_1H
Thu Oct 25, 2018 9:35 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy
Replies: 6
Views: 102

Re: Ionization Energy

I was wondering the same thing... maybe just an exception??
by Mallory_Podosin_1H
Thu Oct 18, 2018 7:53 pm
Forum: Einstein Equation
Topic: Units of Energy
Replies: 5
Views: 103

Re: Units of Energy

The way that I remember the SI units for a Joule is by writing out the equations from physics

E = F*d
also F=ma
so,
J=(kg*m*(s^-2))*m
J=kg*m^2*s^-2
by Mallory_Podosin_1H
Thu Oct 18, 2018 7:50 pm
Forum: Photoelectric Effect
Topic: Threshold energy [ENDORSED]
Replies: 17
Views: 280

Re: Threshold energy [ENDORSED]

Hi Samantha - Threshold energy has to do with the amount of energy required to release an electron from a metal. The threshold energy changes with whatever kind of metal you are using.
by Mallory_Podosin_1H
Thu Oct 18, 2018 7:46 pm
Forum: Properties of Light
Topic: Rydberg formula
Replies: 8
Views: 85

Re: Rydberg formula

I am also confused about the Rydberg formula and which one we are supposed to use. Also - is the Rydberg formula only for Hydrogen?
by Mallory_Podosin_1H
Wed Oct 10, 2018 9:17 pm
Forum: Molarity, Solutions, Dilutions
Topic: Changing Units
Replies: 10
Views: 205

Re: Changing Units

When doing molarity questions - you have to do all the calculations in Liters because Molarity is moles/Liters. So, it wouldn't make sense to use mL when molarity uses Liters, in other words, the units would not cancel and you would get an incorrect answer. After the problem is solved, however, it c...
by Mallory_Podosin_1H
Wed Oct 10, 2018 9:12 pm
Forum: Empirical & Molecular Formulas
Topic: Chemical Formula Element Order
Replies: 5
Views: 135

Re: Chemical Formula Element Order

I had this same question... I think that for now it doesn't matter but later on it may start to matter/we will get used to the order in which the elements are listed.
by Mallory_Podosin_1H
Wed Oct 10, 2018 9:09 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: % Yield
Replies: 8
Views: 196

Re: % Yield

I don't exactly think that there is a "cutoff" in the lab unless you decided to create your own cutoff for a certain situation? Percent yield is (actual yield/theoretical yield) *100% Actual yield is always going to be less than theoretical yield - so the answer will always be 100% or less...
by Mallory_Podosin_1H
Wed Oct 03, 2018 11:01 pm
Forum: Molarity, Solutions, Dilutions
Topic: V=n/c
Replies: 7
Views: 67

Re: V=n/c

On an extended note for this -
What is the difference between M and m? All of the similar variables are confusing me... If someone is interested in simply laying out all the different variables related to Molarity that would be amazingly helpful!
by Mallory_Podosin_1H
Wed Oct 03, 2018 10:52 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Moles!
Replies: 7
Views: 103

Re: Moles!

My only previous chem class was my sophomore year so even stoichiometry feels foreign. I had asked few friends who are good at chem about converting grams to moles using stoichiometry, and they have done it a few different ways but got the same answer. Does anyone have any good tips on how to set u...
by Mallory_Podosin_1H
Tue Oct 02, 2018 2:54 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Moles!
Replies: 7
Views: 103

Moles!

I am VERY rusty on the whole concept of moles...and I am finding it difficult to grasp other concepts without fully understanding moles. Does anyone have any advice on what/how to study and review moles? For example - when to use Avogadro's number, what molar mass is for etc. Any good youtube video ...

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