Search found 51 matches

by emaad_3H
Sun Dec 08, 2019 11:22 pm
Forum: Administrative Questions and Class Announcements
Topic: Final tips
Replies: 19
Views: 151

Re: Final tips

Go through the past exams that we have had. Understand all your mistakes from the midterm and tests.
by emaad_3H
Sun Dec 08, 2019 11:21 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Grade
Replies: 5
Views: 77

Re: Final Grade

I believe they'll be available to see during the second week of winter quarter
by emaad_3H
Sun Dec 08, 2019 11:20 pm
Forum: Administrative Questions and Class Announcements
Topic: curve
Replies: 8
Views: 103

Re: curve

I think he said he might curve it based on the final exam scores.
by emaad_3H
Sun Dec 08, 2019 11:19 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL
Replies: 7
Views: 119

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.
by emaad_3H
Sun Dec 08, 2019 11:18 pm
Forum: Polyprotic Acids & Bases
Topic: Amphiprotic vs Amphoteric
Replies: 6
Views: 67

Re: Amphiprotic vs Amphoteric

Amphoteric is more general than amophiprotic
by emaad_3H
Sun Dec 01, 2019 11:43 pm
Forum: Naming
Topic: Water in Coordination Compounds
Replies: 7
Views: 55

Re: Water in Coordination Compounds

It's just so you know that the oxygen is what is bonded and not the hydrogen.
by emaad_3H
Sun Dec 01, 2019 11:43 pm
Forum: Naming
Topic: Chelating
Replies: 6
Views: 47

Re: Chelating

A chelate is when a ligand has bonded to multiple sites.
by emaad_3H
Sun Dec 01, 2019 11:42 pm
Forum: Naming
Topic: Roman Numeral
Replies: 13
Views: 66

Re: Roman Numeral

It tells you the oxidation state.
by emaad_3H
Sun Dec 01, 2019 11:42 pm
Forum: Naming
Topic: How to Know the Charge of Ions
Replies: 7
Views: 48

Re: How to Know the Charge of Ions

You just have to memorize them.
by emaad_3H
Sun Dec 01, 2019 11:41 pm
Forum: Naming
Topic: Naming of coordination compounds
Replies: 5
Views: 29

Re: Naming of coordination compounds

Yes. We will probably be given the formula first.
by emaad_3H
Sun Nov 24, 2019 3:51 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 3
Views: 21

Coordination Number

What is the significance of the coordination number?
by emaad_3H
Sun Nov 24, 2019 3:50 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Octahedral
Replies: 2
Views: 28

Octahedral

Why are coordination compounds typically octahedral?
by emaad_3H
Sun Nov 24, 2019 3:49 pm
Forum: Naming
Topic: Order
Replies: 4
Views: 21

Re: Order

First is ligand. Then transition metal cation name. If there are anoins, they go after.
by emaad_3H
Sun Nov 24, 2019 3:47 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand
Replies: 4
Views: 25

Ligand

What is a ligand? Where does it bond?
by emaad_3H
Sun Nov 24, 2019 3:47 pm
Forum: Naming
Topic: VSEPR and Coordination Compounds
Replies: 1
Views: 21

VSEPR and Coordination Compounds

Why does VSEPR theory not apply to coordination compounds?
by emaad_3H
Sun Nov 17, 2019 9:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone vs. Bonded Electrons
Replies: 3
Views: 25

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.
by emaad_3H
Sun Nov 17, 2019 8:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 19
Views: 131

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.
by emaad_3H
Sun Nov 17, 2019 8:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 7
Views: 37

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.
by emaad_3H
Sun Nov 17, 2019 8:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shapes
Replies: 6
Views: 38

Re: Molecular Shapes

Yes. It is important to memorize and be able to determine the molecular shape for any given compound.
by emaad_3H
Sun Nov 17, 2019 8:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar and Nonpolar
Replies: 6
Views: 48

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.
by emaad_3H
Sat Nov 09, 2019 11:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Formal Charge
Replies: 9
Views: 488

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.
by emaad_3H
Sat Nov 09, 2019 11:02 pm
Forum: Sigma & Pi Bonds
Topic: One Sigma One Pi
Replies: 3
Views: 26

One Sigma One Pi

Why is one sigma and one pi bond formed instead of two sigma bonds?
by emaad_3H
Sat Nov 09, 2019 11:01 pm
Forum: Hybridization
Topic: Pi vs Sigma Bonds
Replies: 4
Views: 41

Pi vs Sigma Bonds

Why are pi bonds weaker than sigma bonds?
by emaad_3H
Sat Nov 09, 2019 11:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle Quantity
Replies: 3
Views: 29

Bond Angle Quantity

Is it necessary to memorize the exact numerical bond angle value?
by emaad_3H
Sat Nov 09, 2019 10:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 2
Views: 22

Bond Angle

Why do lone pairs repel other electrons more than electrons in bonds?
by emaad_3H
Sun Nov 03, 2019 9:04 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy (Uncertainty) Equation
Replies: 1
Views: 35

Heisenberg Indeterminacy (Uncertainty) Equation

Can someone explain why there's an inverse relationship between the certainty of momentum and position for electrons?
by emaad_3H
Sun Nov 03, 2019 9:01 pm
Forum: Resonance Structures
Topic: Showing resonance
Replies: 8
Views: 41

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?
by emaad_3H
Sun Nov 03, 2019 9:00 pm
Forum: Electronegativity
Topic: Defining electronegativity
Replies: 2
Views: 25

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?
by emaad_3H
Sun Nov 03, 2019 8:54 pm
Forum: Empirical & Molecular Formulas
Topic: Rounding
Replies: 6
Views: 83

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.
by emaad_3H
Sun Nov 03, 2019 8:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration for cations
Replies: 3
Views: 36

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).
by emaad_3H
Sun Oct 27, 2019 9:16 pm
Forum: Resonance Structures
Topic: Equal Bond Length
Replies: 4
Views: 47

Equal Bond Length

Can someone explain how a molecule has equal bond length when some are single and others are double?
by emaad_3H
Sun Oct 27, 2019 9:11 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.23 (unpaired electrons)
Replies: 2
Views: 26

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.
by emaad_3H
Sun Oct 27, 2019 9:09 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 6
Views: 36

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...
by emaad_3H
Sun Oct 27, 2019 9:07 pm
Forum: Formal Charge and Oxidation Numbers
Topic: 0 Formal Charge
Replies: 2
Views: 18

0 Formal Charge

Why is a formal charge of 0 preferred?
by emaad_3H
Sun Oct 20, 2019 9:23 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: magnetic quantum #
Replies: 3
Views: 35

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.
by emaad_3H
Sun Oct 20, 2019 9:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Noble Gases in Electron Configurations
Replies: 6
Views: 24

Noble Gases in Electron Configurations

Why do we use noble gases to shorten the electron configuration description of multi-electron atoms?
by emaad_3H
Sun Oct 20, 2019 9:16 pm
Forum: Quantum Numbers and The H-Atom
Topic: Possible Quantum Number Values
Replies: 4
Views: 33

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?
by emaad_3H
Sun Oct 20, 2019 9:12 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Negative Energy of Electron
Replies: 1
Views: 15

Negative Energy of Electron

Why is the energy of an electron a negative value?
by emaad_3H
Sun Oct 20, 2019 9:11 pm
Forum: Quantum Numbers and The H-Atom
Topic: Balmer and Lyman Series
Replies: 6
Views: 56

Balmer and Lyman Series

Can someone explain what the Balmer and Lyman series are and what the significance of them is?
by emaad_3H
Sat Oct 12, 2019 11:35 pm
Forum: Significant Figures
Topic: Sig Figs at the Beginning or End
Replies: 14
Views: 175

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?
by emaad_3H
Sat Oct 12, 2019 11:32 pm
Forum: Properties of Light
Topic: Large Objects
Replies: 7
Views: 64

Large Objects

Why do larger objects tend to behave less like a wave compared to smaller objects?
by emaad_3H
Sat Oct 12, 2019 11:26 pm
Forum: Properties of Electrons
Topic: Electron Quantum Energies
Replies: 3
Views: 30

Electron Quantum Energies

Why do electrons only exist in quantum energies? Why are they not continuous in their distance from the nucleus?
by emaad_3H
Sat Oct 12, 2019 11:24 pm
Forum: Empirical & Molecular Formulas
Topic: Nomenclature
Replies: 11
Views: 157

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?
by emaad_3H
Sat Oct 12, 2019 11:21 pm
Forum: Properties of Light
Topic: Light's Behavior
Replies: 3
Views: 37

Light's Behavior

What does it mean when we say that light acts as a wave and as a particle?
by emaad_3H
Sun Oct 06, 2019 6:09 pm
Forum: Molarity, Solutions, Dilutions
Topic: M1V1=M2V2
Replies: 11
Views: 146

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?
by emaad_3H
Fri Oct 04, 2019 11:37 am
Forum: Limiting Reactant Calculations
Topic: Temperature Effect on Reactions
Replies: 2
Views: 32

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?
by emaad_3H
Fri Oct 04, 2019 11:33 am
Forum: Balancing Chemical Reactions
Topic: When are atoms lost or created?
Replies: 14
Views: 219

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...
by emaad_3H
Fri Oct 04, 2019 11:30 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Theoretical vs. Actual Yield
Replies: 38
Views: 498

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?
by emaad_3H
Fri Oct 04, 2019 11:20 am
Forum: Empirical & Molecular Formulas
Topic: Determining Molecular Formulas
Replies: 1
Views: 32

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 ...
by emaad_3H
Fri Oct 04, 2019 11:18 am
Forum: Molarity, Solutions, Dilutions
Topic: Dilution Calculation
Replies: 5
Views: 35

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?

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