Search found 51 matches
- Sun Dec 08, 2019 11:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final tips
- Replies: 19
- Views: 1002
Re: Final tips
Go through the past exams that we have had. Understand all your mistakes from the midterm and tests.
- Sun Dec 08, 2019 11:21 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Grade
- Replies: 5
- Views: 409
Re: Final Grade
I believe they'll be available to see during the second week of winter quarter
- Sun Dec 08, 2019 11:20 pm
- Forum: Administrative Questions and Class Announcements
- Topic: curve
- Replies: 8
- Views: 613
Re: curve
I think he said he might curve it based on the final exam scores.
- Sun Dec 08, 2019 11:19 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL
- Replies: 7
- Views: 551
Re: FINAL
It was pretty boring. There was no music playing during the exam. I could've really used some Cudi to get me through that.
- Sun Dec 08, 2019 11:18 pm
- Forum: Polyprotic Acids & Bases
- Topic: Amphiprotic vs Amphoteric
- Replies: 6
- Views: 584
Re: Amphiprotic vs Amphoteric
Amphoteric is more general than amophiprotic
- Sun Dec 01, 2019 11:43 pm
- Forum: Naming
- Topic: Water in Coordination Compounds
- Replies: 7
- Views: 568
Re: Water in Coordination Compounds
It's just so you know that the oxygen is what is bonded and not the hydrogen.
Re: Chelating
A chelate is when a ligand has bonded to multiple sites.
- Sun Dec 01, 2019 11:42 pm
- Forum: Naming
- Topic: Roman Numeral
- Replies: 13
- Views: 856
Re: Roman Numeral
It tells you the oxidation state.
- Sun Dec 01, 2019 11:42 pm
- Forum: Naming
- Topic: How to Know the Charge of Ions
- Replies: 7
- Views: 469
Re: How to Know the Charge of Ions
You just have to memorize them.
- Sun Dec 01, 2019 11:41 pm
- Forum: Naming
- Topic: Naming of coordination compounds
- Replies: 5
- Views: 423
Re: Naming of coordination compounds
Yes. We will probably be given the formula first.
- Sun Nov 24, 2019 3:51 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 3
- Views: 229
Coordination Number
What is the significance of the coordination number?
- Sun Nov 24, 2019 3:50 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Octahedral
- Replies: 2
- Views: 287
Octahedral
Why are coordination compounds typically octahedral?
Re: Order
First is ligand. Then transition metal cation name. If there are anoins, they go after.
- Sun Nov 24, 2019 3:47 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand
- Replies: 4
- Views: 298
Ligand
What is a ligand? Where does it bond?
- Sun Nov 24, 2019 3:47 pm
- Forum: Naming
- Topic: VSEPR and Coordination Compounds
- Replies: 1
- Views: 184
VSEPR and Coordination Compounds
Why does VSEPR theory not apply to coordination compounds?
- Sun Nov 17, 2019 9:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone vs. Bonded Electrons
- Replies: 3
- Views: 323
Re: Lone vs. Bonded Electrons
Lone pairs are delocalized electrons which have a larger electron density than localized bonded electrons. Because of this, they tend to have a greater repulsion than bonded electrons and push other electrons further away.
- Sun Nov 17, 2019 8:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 2
- Replies: 19
- Views: 818
Re: Test 2
Draw the most stable Lewis structure (as we were required to do before) and determine the molecular shape and bond angle for it.
- Sun Nov 17, 2019 8:56 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 7
- Views: 329
Re: VSEPR
We need to know what the molecular shape for a given compound is, how to draw its Lewis structure, and the bond angles between all atoms in the molecule.
- Sun Nov 17, 2019 8:55 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shapes
- Replies: 6
- Views: 404
Re: Molecular Shapes
Yes. It is important to memorize and be able to determine the molecular shape for any given compound.
- Sun Nov 17, 2019 8:54 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar and Nonpolar
- Replies: 6
- Views: 605
Re: Polar and Nonpolar
Draw lewis structures and then look at electronegativity differences amongst bonds to draw dipole moments. If the dipole moments do not cancel, the molecule is polar.
- Sat Nov 09, 2019 11:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Formal Charge
- Replies: 9
- Views: 1418
Re: Formal Charge
You want to minimize the magnitude of formal charges for the sum of the atoms. You want to maximize the number of formal charges of 0.
- Sat Nov 09, 2019 11:02 pm
- Forum: Sigma & Pi Bonds
- Topic: One Sigma One Pi
- Replies: 3
- Views: 218
One Sigma One Pi
Why is one sigma and one pi bond formed instead of two sigma bonds?
- Sat Nov 09, 2019 11:01 pm
- Forum: Hybridization
- Topic: Pi vs Sigma Bonds
- Replies: 4
- Views: 294
Pi vs Sigma Bonds
Why are pi bonds weaker than sigma bonds?
- Sat Nov 09, 2019 11:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angle Quantity
- Replies: 3
- Views: 288
Bond Angle Quantity
Is it necessary to memorize the exact numerical bond angle value?
- Sat Nov 09, 2019 10:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angle
- Replies: 2
- Views: 82
Bond Angle
Why do lone pairs repel other electrons more than electrons in bonds?
- Sun Nov 03, 2019 9:04 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg Indeterminacy (Uncertainty) Equation
- Replies: 5
- Views: 345
Heisenberg Indeterminacy (Uncertainty) Equation
Can someone explain why there's an inverse relationship between the certainty of momentum and position for electrons?
- Sun Nov 03, 2019 9:01 pm
- Forum: Resonance Structures
- Topic: Showing resonance
- Replies: 8
- Views: 345
Showing resonance
Is there a way that we are supposed to show whether a compound has resonance? Are we supposed to do the double arrow?
- Sun Nov 03, 2019 9:00 pm
- Forum: Electronegativity
- Topic: Defining electronegativity
- Replies: 6
- Views: 748
Defining electronegativity
Is electronegativity a measure of an element's desire for a new electron or how strongly it's holding onto the electrons it already has?
- Sun Nov 03, 2019 8:54 pm
- Forum: Empirical & Molecular Formulas
- Topic: Rounding
- Replies: 6
- Views: 610
Re: Rounding
Typically, we are looking for multiples of 2 (#.5), 3 (#.33, #.66), or 4 (#.25, #.75) so we can determine whether or not it is necessary to multiply up. For the purposes of this class, it won't be anything ambiguous.
- Sun Nov 03, 2019 8:51 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration for cations
- Replies: 3
- Views: 159
Re: Electron Configuration for cations
The outermost (valence) electrons are typically the ones that do stuff. They're the ones that are involved in bonding and when electrons are removed, it is the outermost ones that are taken off of the atom. Because it is a cation, that means it lost an electron (the one with the highest energy level).
- Sun Oct 27, 2019 9:17 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configurations for Exceptions
- Replies: 2
- Views: 284
- Sun Oct 27, 2019 9:16 pm
- Forum: Resonance Structures
- Topic: Equal Bond Length
- Replies: 4
- Views: 157
Equal Bond Length
Can someone explain how a molecule has equal bond length when some are single and others are double?
- Sun Oct 27, 2019 9:11 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 1E.23 (unpaired electrons)
- Replies: 2
- Views: 1466
Re: 1E.23 (unpaired electrons)
For there to be an unpaired electron, there must be an odd number of valence electrons. Each "pair" of electrons is 2 electrons which means that in the case with bromine where there are 7 valence electrons, there are 3 pairs and 1 left over which means there is 1 unpaired electron.
- Sun Oct 27, 2019 9:09 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 6
- Views: 541
Re: Electronegativity
Fluorine is the most electronegative because if you went further to the right or higher up, you'd reach noble gases. Electronegativity is a measure of a tendency for an atom to attract an electron. Noble gases already have a full octet or in the case of helium 2 electrons and do not need any more el...
- Sun Oct 27, 2019 9:07 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: 0 Formal Charge
- Replies: 2
- Views: 202
0 Formal Charge
Why is a formal charge of 0 preferred?
- Sun Oct 20, 2019 9:23 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: magnetic quantum #
- Replies: 3
- Views: 150
Re: magnetic quantum #
There's no way to determine which orientation the orbital has. We simply use the different subscripts to differentiate them not to necessarily identify each one.
- Sun Oct 20, 2019 9:17 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Noble Gases in Electron Configurations
- Replies: 6
- Views: 370
Noble Gases in Electron Configurations
Why do we use noble gases to shorten the electron configuration description of multi-electron atoms?
- Sun Oct 20, 2019 9:16 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Possible Quantum Number Values
- Replies: 4
- Views: 286
Possible Quantum Number Values
If the principal quantum number can go past 4 and the the orbital angular momentum quantum number can go up to a value of (n-1) but also represents the shape of the orbitals, does that mean that there are orbitals beyond the f subshell? What would that look like?
- Sun Oct 20, 2019 9:12 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Negative Energy of Electron
- Replies: 1
- Views: 98
Negative Energy of Electron
Why is the energy of an electron a negative value?
- Sun Oct 20, 2019 9:11 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Balmer and Lyman Series
- Replies: 6
- Views: 626
Balmer and Lyman Series
Can someone explain what the Balmer and Lyman series are and what the significance of them is?
- Sat Oct 12, 2019 11:35 pm
- Forum: Significant Figures
- Topic: Sig Figs at the Beginning or End
- Replies: 14
- Views: 4694
Sig Figs at the Beginning or End
If a question requires many calculations (addition/subtraction AND multiplication/division) then at what point are you supposed to follow the sig fig rules? Do you base it on the given numbers or do you do it at each step before reaching the answer?
- Sat Oct 12, 2019 11:32 pm
- Forum: Properties of Light
- Topic: Large Objects
- Replies: 7
- Views: 1073
Large Objects
Why do larger objects tend to behave less like a wave compared to smaller objects?
- Sat Oct 12, 2019 11:26 pm
- Forum: Properties of Electrons
- Topic: Electron Quantum Energies
- Replies: 3
- Views: 171
Electron Quantum Energies
Why do electrons only exist in quantum energies? Why are they not continuous in their distance from the nucleus?
- Sat Oct 12, 2019 11:24 pm
- Forum: Empirical & Molecular Formulas
- Topic: Nomenclature
- Replies: 11
- Views: 2256
Nomenclature
Are we expected to know the molecular formula of a compound based on just its name. For example, if we're told "magnesium citrate reacts with..." are we supposed to know that magnesium citrate is C6H6MgO7?
- Sat Oct 12, 2019 11:21 pm
- Forum: Properties of Light
- Topic: Light's Behavior
- Replies: 3
- Views: 266
Light's Behavior
What does it mean when we say that light acts as a wave and as a particle?
- Sun Oct 06, 2019 6:09 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: M1V1=M2V2
- Replies: 11
- Views: 84910
M1V1=M2V2
When can you use the equation M1V1=M2V2? Are there certain scenarios where you have to convert to moles in order to solve for dilution problems?
- Fri Oct 04, 2019 11:37 am
- Forum: Limiting Reactant Calculations
- Topic: Temperature Effect on Reactions
- Replies: 2
- Views: 108
Temperature Effect on Reactions
Can temperature be a reason why one element is in excess over the other? I know temperature has an effect on reaction rate, but can it affect whether or not a reaction goes to completion? And if so, do we need to take it into account right now?
- Fri Oct 04, 2019 11:33 am
- Forum: Balancing Chemical Reactions
- Topic: When are atoms lost or created?
- Replies: 14
- Views: 1723
Re: When are atoms lost or created?
The law of conservation of mass states that for any closed system, the mass of the system must remain constant. Atoms cannot be created or destroyed in a reaction. The confusion might lie in the fact that different molecules are created. The atoms are just rearranged and form different bonds than th...
- Fri Oct 04, 2019 11:30 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Theoretical vs. Actual Yield
- Replies: 38
- Views: 13868
Theoretical vs. Actual Yield
What are some reasons why the actual yield for an experimental reaction is not equal to the theoretical yield? Do we need to be prepared to explain why this happened if given a lab scenario?
- Fri Oct 04, 2019 11:20 am
- Forum: Empirical & Molecular Formulas
- Topic: Determining Molecular Formulas
- Replies: 1
- Views: 120
Determining Molecular Formulas
If given percent mass composition of a compound and the molecular mass of the final compound, can I multiply the total mass by the percentage of each of the elements' mass composition and then convert from grams to moles in order to obtain the molecular formula and then get the empirical formula by ...
- Fri Oct 04, 2019 11:18 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Dilution Calculation
- Replies: 5
- Views: 211
Dilution Calculation
If I am using the M1V1=M2V2 dilution equation and I am given M1, M2, and V2, and the final answer is asked to be in milliliters, do I still have to convert the final volume into liters to get V1 in terms of liters or can I leave it in milliliters and get my answer in millimeters?