Search found 50 matches

by Andrea_1H
Sun Dec 08, 2019 11:03 am
Forum: Polyprotic Acids & Bases
Topic: Polyproptic Acids/Bases
Replies: 4
Views: 123

Polyproptic Acids/Bases

How can you tell which acids and bases are polyproptic? Are there any common examples?
by Andrea_1H
Sun Dec 08, 2019 10:48 am
Forum: Biological Examples
Topic: en and edta
Replies: 5
Views: 127

en and edta

For en and EDTA are we only supposed to know that en is bidentate and EDTA is hexadentate?
by Andrea_1H
Sun Dec 08, 2019 10:44 am
Forum: Biological Examples
Topic: Hemoglobin and Myoglobin
Replies: 4
Views: 176

Re: Hemoglobin and Myoglobin

Sydney Pell 3E wrote:What is the function of hemoglobin and myoglobin?

Myoglobin transports oxygen in muscle cells ( heme complex + protein -> myoglobin -> Fe binds to oxygen)

Hemoglobin transports O2 in the blood by binding 4 O2
by Andrea_1H
Sun Dec 08, 2019 10:40 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: Hydrogen bonding
Replies: 3
Views: 103

Hydrogen bonding

To form a hydrogen bond, do both molecules have to have a hydrogen connected to a F, O or N?
by Andrea_1H
Sun Dec 08, 2019 10:37 am
Forum: Lewis Acids & Bases
Topic: Strong Acids vs weak
Replies: 2
Views: 116

Strong Acids vs weak

Should we assume acids that aren’t one of the string ones are weak or should we also memorize the neutral ones?
by Andrea_1H
Sun Dec 01, 2019 8:46 pm
Forum: Naming
Topic: -bis, -tris, etc
Replies: 5
Views: 75

-bis, -tris, etc

I'm still confused on when we would use -bis, -tris, -tetrakis etc. Are there any examples of this that we'd be more likely to see on the final?
by Andrea_1H
Sun Dec 01, 2019 8:44 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Compound
Replies: 2
Views: 32

Amphoteric Compound

What exactly does it mean for a compound to be amphoteric and how can you figure this out?
by Andrea_1H
Sun Dec 01, 2019 8:39 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Homework question 9C.7
Replies: 2
Views: 81

Homework question 9C.7

9C.7 Which of the following isomers of diaminobenzene can form chelating complexes? Explain your reasoning.

How do you know which isomers can form chelating complexes?
by Andrea_1H
Sun Dec 01, 2019 8:25 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 9C.1
Replies: 1
Views: 25

9C.1

9C.1 Name each of the following complex ions and identify the oxidation number of the metal: (a) [Fe(CN)6]42; (b) [Co(NH3)6]31; (c) [Co(CN)5(OH2)]22; (d) [Co(NH3)5(SO4)]1.

How would we identify the oxidation number for say a?
by Andrea_1H
Sun Nov 24, 2019 11:02 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted vs Lewis acids
Replies: 5
Views: 51

Re: Bronsted vs Lewis acids

Lewis acids accept electron pairs, meanwhile Bronsted acids donate proton.
by Andrea_1H
Sun Nov 24, 2019 9:51 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 17
Views: 365

Cisplatin

What did Dr. Lavelle say cisplatin does to normal, healthy cells?
by Andrea_1H
Sun Nov 24, 2019 6:48 pm
Forum: Lewis Acids & Bases
Topic: HCl vs HF
Replies: 19
Views: 222

HCl vs HF

Why is HCl a stronger acid than HF?
by Andrea_1H
Sun Nov 24, 2019 6:45 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating Ligand
Replies: 1
Views: 19

Chelating Ligand

How do chelating ligands work?
by Andrea_1H
Sun Nov 24, 2019 6:33 pm
Forum: Hybridization
Topic: Hybrid Orbitals
Replies: 2
Views: 29

Hybrid Orbitals

How do you determine hybrid orbitals ?
by Andrea_1H
Sun Nov 17, 2019 10:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: SF4
Replies: 3
Views: 35

SF4

In Friday's lecture, what did Lavelle mean when he said that one of the equatorial (?) positions is where we place the lone pairs? What does that mean, and what does that do in terms of the electrons and the bond angles?
by Andrea_1H
Sun Nov 17, 2019 10:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 3
Views: 36

Molecular Shape

What's the difference between trigonal pyramidal and t-shape? For example, why is BrF3 t-shape and NH3 trigonal pyramidal?
by Andrea_1H
Sun Nov 10, 2019 11:04 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bond
Replies: 3
Views: 70

Coordinate Covalent Bond

What is a coordinate covalent bond? How are they different from a covalent bond?
by Andrea_1H
Sun Nov 10, 2019 10:59 pm
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 6
Views: 49

Re: Dipole Moments

So can dipole moments be temporary or all they all permanent?
by Andrea_1H
Sun Nov 10, 2019 10:45 pm
Forum: Bond Lengths & Energies
Topic: Bond lengths and strength
Replies: 4
Views: 39

Bond lengths and strength

Why are double bonds stronger than single bonds?
by Andrea_1H
Sun Nov 10, 2019 10:40 pm
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 6
Views: 49

Dipole Moments

What exactly is a dipole moment?
by Andrea_1H
Sun Nov 10, 2019 10:36 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 4
Views: 69

Polarizability

Why is it that larger atoms have higher polarizability?
by Andrea_1H
Sun Nov 03, 2019 11:30 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Differences between polarizing power and polarizablity
Replies: 2
Views: 50

Differences between polarizing power and polarizablity

What’s the difference between polarizability and polarizing power? And how exactly can you tell who unions have higher polarizing power?
by Andrea_1H
Sun Nov 03, 2019 11:28 pm
Forum: Bond Lengths & Energies
Topic: Short bond lengths vs long bond lengths
Replies: 6
Views: 65

Short bond lengths vs long bond lengths

Why are shorter bond lengths stronger than longer bond lengths?
by Andrea_1H
Sun Nov 03, 2019 11:27 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge
Replies: 16
Views: 211

Formal charge

What if we can’t get all the atoms to have a formal charge of 0? Is there a “second best” option?
by Andrea_1H
Sun Nov 03, 2019 11:25 pm
Forum: Dipole Moments
Topic: Dipole moments on Lewis structures
Replies: 3
Views: 44

Dipole moments on Lewis structures

how do we draw dipole moments on Lewis structures?
by Andrea_1H
Sun Nov 03, 2019 11:24 pm
Forum: Bond Lengths & Energies
Topic: Bond lengths
Replies: 4
Views: 51

Bond lengths

How do you predict bond lengths? I know Dr. Lavelle showed us an example in lecture, but I’m still confused as to how you’d figure that out.
by Andrea_1H
Sun Oct 27, 2019 8:40 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity vs. Electron affinity
Replies: 8
Views: 113

Electronegativity vs. Electron affinity

Is there a difference between electronegativity and electron affinity?
by Andrea_1H
Sun Oct 27, 2019 8:38 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chromium and Copper
Replies: 5
Views: 56

Chromium and Copper

Why are Chromium and Copper exceptions to the Aufbau principle?
by Andrea_1H
Sun Oct 27, 2019 8:28 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.23 (unpaired electrons)
Replies: 2
Views: 197

1E.23 (unpaired electrons)

1E.23. The elements Ga, Ge, As, Se, and Br lie in the same period in the periodic table. Write the electron configuration expected for the ground-state atoms of these elements and predict how many unpaired electrons, if any, each atom has. How exactly do you know how many unpaired electrons an atom ...
by Andrea_1H
Sun Oct 27, 2019 8:22 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations (3d-orbital and 4s-orbital)
Replies: 2
Views: 48

Electron Configurations (3d-orbital and 4s-orbital)

Is there a specific reason we fill the 4s-orbital before the 3d-orbital when doing the electron configurations? And does that mean when we’re taking electrons away, we take them from 4s first?
by Andrea_1H
Sun Oct 27, 2019 8:21 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy
Replies: 4
Views: 57

Ionization Energy

How can you tell which atom has the lowest ionization energy when constructing a Lewis structure? Or just in general?
by Andrea_1H
Sun Oct 20, 2019 9:39 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configurations of ions
Replies: 4
Views: 39

Electron configurations of ions

For ions, how do you know when you need to take away electrons from the configuration, and when you need to add them?
by Andrea_1H
Sun Oct 20, 2019 9:35 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty value in equation
Replies: 9
Views: 110

Uncertainty value in equation

For the uncertainty value, you add up the total uncertainty right? So for example, if you have 105 m +/- 3 m, the uncertainty value is 6 m? Or is it 3?
by Andrea_1H
Sun Oct 20, 2019 5:01 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg's Constant
Replies: 3
Views: 48

Rydberg's Constant

For Rydberg's constant, we should only use the one provided in the equations and constants sheet Dr. Lavelle has on his website, right? And we should stick to E= rather than Rydberg's equation?
by Andrea_1H
Thu Oct 17, 2019 11:29 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 3
Views: 51

Quantum Numbers

Why is not possible? I did not understand Dr. Lavelle's explanation in lecture.
by Andrea_1H
Thu Oct 17, 2019 11:09 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Lyman vs Balmer Series
Replies: 2
Views: 50

Lyman vs Balmer Series

How do we know when a line is in either the Lyman Series or the Balmer series? I'm still confused as to how you can tell.
by Andrea_1H
Sun Oct 13, 2019 11:08 pm
Forum: Properties of Electrons
Topic: Quantum Mechanic Description of Atoms
Replies: 1
Views: 35

Quantum Mechanic Description of Atoms

Dr. Lavelle's explanation of this towards the end of Friday's lecture confused me. Can someone explain what he meant when he showed the two diagrams ("Allowed Energy Level" vs "Not allowed") and why the Allowed Energy Level diagram is the correct one when talking about electrons?
by Andrea_1H
Sun Oct 13, 2019 10:57 pm
Forum: DeBroglie Equation
Topic: Using the De Broglie equation
Replies: 1
Views: 48

Using the De Broglie equation

What did Dr. Lavelle say was the minimum wavelike properties that could be detected?
by Andrea_1H
Sun Oct 13, 2019 10:55 pm
Forum: Properties of Light
Topic: Atomic Spectra
Replies: 3
Views: 50

Atomic Spectra

Will it be enough to just memorize that 400nm-700nm is visible light, and anything less than 400nm is UV, and anything above 700nm is infrared? Can we just assume we don't have to worry about the other ones (e.g., x-rays, microwaves, etc.) right now?
by Andrea_1H
Sun Oct 13, 2019 10:23 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectroscopy
Replies: 1
Views: 45

Atomic Spectroscopy

Is there a reason that the distance between n=1 and n=2 is greater than say n=2 and n=3?
by Andrea_1H
Sun Oct 13, 2019 9:53 pm
Forum: Properties of Electrons
Topic: Diffraction
Replies: 2
Views: 21

Diffraction

What is the difference between constructive interference and destructive interference?
by Andrea_1H
Sun Oct 06, 2019 8:02 pm
Forum: Significant Figures
Topic: When do zeros count?
Replies: 5
Views: 82

When do zeros count?

I'm still unclear as to when zeros are counted in the number of sig figs and when they aren't. Why does 1.00 have 3, but 0.01 only have 1? Can someone explain the difference?
by Andrea_1H
Sun Oct 06, 2019 7:45 pm
Forum: Molarity, Solutions, Dilutions
Topic: M1V1=M2V2
Replies: 11
Views: 6537

Re: M1V1=M2V2

You could use this formula in a question like: If you dilute 300. mL of a 4.00 M solution of CuCl_{2} to 900. mL, what is the new concentration of the solution? (from a step-up session) First, you'd use your given to figure out what parts of the equation you already have and then just plugging it in...
by Andrea_1H
Sun Oct 06, 2019 7:32 pm
Forum: Significant Figures
Topic: Number of significant figures
Replies: 5
Views: 62

Re: Number of significant figures

It depends on the problem, I think. You should look at what is given in each problem and then use the lowest number of sig figs.
by Andrea_1H
Sun Oct 06, 2019 7:24 pm
Forum: Balancing Chemical Reactions
Topic: Steps of question L35
Replies: 1
Views: 52

Steps of question L35

I'm unclear as to why in the solution it goes
More specifically, why do we multiply those two together?
by Andrea_1H
Sun Oct 06, 2019 7:05 pm
Forum: Limiting Reactant Calculations
Topic: Unclear on Law of Conservation of Mass
Replies: 1
Views: 77

Unclear on Law of Conservation of Mass

The Law of Conservation of Mass makes sense to me, but in lecture the example used was 2Na(s) + 2H_{2}O(l) \rightarrow 2NaOH(aq) +H_{2}(g) and he put that it's basically 2 moles of sodium + 2 moles of water = 2 moles of NaOH + 1 mole of hydrogen. Does there not have t...

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