Search found 60 matches

by Darren Nguyen 1F
Sun Dec 01, 2019 4:37 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Does a double bond count as polydentate?
Replies: 1
Views: 23

Does a double bond count as polydentate?

Aren't there two pairs of electrons being shared here?
by Darren Nguyen 1F
Sun Dec 01, 2019 4:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How do you determine if a ligand can be polydentate?
Replies: 2
Views: 38

Re: How do you determine if a ligand can be polydentate?

A ligand can be polydentate if it has two or more lone pairs that can form a coordinate covalent bond with the transition metal cation. The chloride ion can only be monodentate because it is only one atom and can only donate one electron pair to form a coordinate covalent bond with the cation. Typi...
by Darren Nguyen 1F
Sun Dec 01, 2019 4:23 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How do you determine if a ligand can be polydentate?
Replies: 2
Views: 38

How do you determine if a ligand can be polydentate?

For example a chloride ion or ethylenediaminetetraacetate
by Darren Nguyen 1F
Sun Dec 01, 2019 3:32 pm
Forum: Bronsted Acids & Bases
Topic: Are some compounds more suitable to be a bronsted acid?
Replies: 1
Views: 31

Are some compounds more suitable to be a bronsted acid?

And what makes them better bronsted acids?
by Darren Nguyen 1F
Sun Dec 01, 2019 2:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Are complex ions the same as coordination compounds?
Replies: 3
Views: 31

Re: Are complex ions the same as coordination compounds?

A complex is a species consisting of a central metal atom or ion to which a number of molecules or ions are attached by coordinate covalent bonds. A coordination compound is an electrically neutral compound in which at least one of the ions present is a complex. A complex is present within a coordi...
by Darren Nguyen 1F
Sun Nov 24, 2019 9:50 pm
Forum: Lewis Acids & Bases
Topic: When is an acid considered Bronsted?
Replies: 9
Views: 142

When is an acid considered Bronsted?

What makes them different
by Darren Nguyen 1F
Sun Nov 24, 2019 9:49 pm
Forum: Lewis Acids & Bases
Topic: When does a complex become a chelate?
Replies: 3
Views: 75

When does a complex become a chelate?

What are the conditions?
by Darren Nguyen 1F
Sun Nov 24, 2019 9:47 pm
Forum: Lewis Acids & Bases
Topic: What does a cage-like molecule look like?
Replies: 1
Views: 22

What does a cage-like molecule look like?

I didn't understand that part of the lecture
by Darren Nguyen 1F
Sun Nov 24, 2019 9:43 pm
Forum: Lewis Acids & Bases
Topic: Why do transition metal cations form complexes?
Replies: 2
Views: 45

Why do transition metal cations form complexes?

What about them makes them special?
by Darren Nguyen 1F
Sun Nov 17, 2019 8:41 pm
Forum: Lewis Structures
Topic: Why can Xenon break the octet rule?
Replies: 8
Views: 635

Why can Xenon break the octet rule?

There are so many exceptions how can I keep track of them all?
by Darren Nguyen 1F
Sun Nov 17, 2019 3:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Can there be lone pairs on the central atom if the shape is linear?
Replies: 4
Views: 46

Can there be lone pairs on the central atom if the shape is linear?

Like what if there was a lone pair above a below the central atom, could the molecular shape stay linear that way?
by Darren Nguyen 1F
Tue Nov 12, 2019 9:46 pm
Forum: Dipole Moments
Topic: When is there a dipole moment?
Replies: 3
Views: 48

Re: When is there a dipole moment?

Brooke Yasuda 4B wrote:There are always induced dipole induced dipole intermolecular forces between all molecules and these are temporary dipoles. Dipole dipole moments and other dipoles occur when molecules are polar, so they are permanent.


At what point do we consider two atoms to be polar?
by Darren Nguyen 1F
Tue Nov 12, 2019 9:44 pm
Forum: Dipole Moments
Topic: Why doesn't CH3CHO form a hydrogen bond?
Replies: 3
Views: 45

Why doesn't CH3CHO form a hydrogen bond?

Does the HO at the end not form a hydrogen bond?
by Darren Nguyen 1F
Tue Nov 12, 2019 9:40 pm
Forum: Dipole Moments
Topic: When is there a dipole moment?
Replies: 3
Views: 48

When is there a dipole moment?

Are you just looking at electronegativity differences? Then is there a cutoff?
by Darren Nguyen 1F
Tue Nov 12, 2019 9:36 pm
Forum: Dipole Moments
Topic: How does O3 have dipole-dipole interactions?
Replies: 2
Views: 67

How does O3 have dipole-dipole interactions?

How can it have a dipole moment if they are all the same atom?
by Darren Nguyen 1F
Tue Nov 12, 2019 8:45 pm
Forum: Dipole Moments
Topic: Is hydrogen bonding a dipole-dipole interaction?
Replies: 2
Views: 30

Is hydrogen bonding a dipole-dipole interaction?

Or something separate?
by Darren Nguyen 1F
Tue Nov 12, 2019 8:44 pm
Forum: Dipole Moments
Topic: Identify the types of attractive intermolecular interactions that might arise between molecules?
Replies: 1
Views: 41

Identify the types of attractive intermolecular interactions that might arise between molecules?

Identify the types of attractive intermolecular interactions that might arise between molecules of each of the following substances: (a) NH2OH; (b) CBr4; (c) H2SeO4; (d) SO2.

How do we know what interactions?
by Darren Nguyen 1F
Tue Nov 05, 2019 10:41 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Sr 2+ or Rb 1+
Replies: 6
Views: 58

Re: Sr 2+ or Rb 1+

Rb has the larger Atomic Radius, Consequently Sr has a higher polarizing power. Larger radius=more polarizability smaller radius=more Polarizing Power... how does Rb have the larger atomic radius? A good way of looking at the atomic radius is that when going further down a period, elements have mor...
by Darren Nguyen 1F
Tue Nov 05, 2019 10:09 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Sr 2+ or Rb 1+
Replies: 6
Views: 58

Re: Sr 2+ or Rb 1+

KMenjivar_3A wrote:Another way to look at it is if the positive charge of one element is greater than the other one, the element with the greater charge has a higher polarizing power.


Does the fact that one has more protons matter?
by Darren Nguyen 1F
Tue Nov 05, 2019 10:05 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Sr 2+ or Rb 1+
Replies: 6
Views: 58

Re: Sr 2+ or Rb 1+

Alexa Hernandez 3k wrote:Rb has the larger Atomic Radius, Consequently Sr has a higher polarizing power.
Larger radius=more polarizability
smaller radius=more Polarizing Power...


how does Rb have the larger atomic radius?
by Darren Nguyen 1F
Tue Nov 05, 2019 9:53 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Sr 2+ or Rb 1+
Replies: 6
Views: 58

Sr 2+ or Rb 1+

Sr2+ or Rb+ . Which has more polarizing power?
by Darren Nguyen 1F
Tue Nov 05, 2019 7:00 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Which lewis structure will make the dominant contribution to a resonance hybrid?
Replies: 5
Views: 82

Which lewis structure will make the dominant contribution to a resonance hybrid?

Out of two given pairs, what are we looking for? I know you want a structure where negative charge is given to the more electronegative atom. What if one structure can result in no charge for any of the atoms. Is that the most preferred?
by Darren Nguyen 1F
Tue Nov 05, 2019 4:54 pm
Forum: Trends in The Periodic Table
Topic: Why does having more polar ions create more covalent character?
Replies: 2
Views: 59

Why does having more polar ions create more covalent character?

A larger difference in electronegativity (>2) is considered ionic. So shouldn't having a more highly polarizable anion make the bond more ionic, rather than covalent?
by Darren Nguyen 1F
Sun Nov 03, 2019 8:27 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 4s or 3d first?
Replies: 14
Views: 392

4s or 3d first?

I wrote "4s before 3d" in my notes but google says the config for Sc is [Ar] 3d1 4s2
by Darren Nguyen 1F
Sun Nov 03, 2019 8:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Do we use coulomb's law for anything?
Replies: 1
Views: 36

Do we use coulomb's law for anything?

I don't remember doing a single problem using it
by Darren Nguyen 1F
Sun Nov 03, 2019 8:16 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Why does the D block start with 3d?
Replies: 1
Views: 47

Why does the D block start with 3d?

Shouldn't it be 4d? Why is it offset?
by Darren Nguyen 1F
Sun Nov 03, 2019 8:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Finding electron configurations
Replies: 4
Views: 74

Re: Finding electron configurations

Gallium would be [Ar] 4s2 3d10 4p1 . You use the noble gas as a shortcut/checkpoint so you don't have to write everything above. Then you just start with the next row like normal.
by Darren Nguyen 1F
Sun Nov 03, 2019 8:06 pm
Forum: SI Units, Unit Conversions
Topic: Do you always convert to SI units for calculations?
Replies: 3
Views: 170

Do you always convert to SI units for calculations?

Like for empirical formula you use grams, not Kg. Then what is the point of SI units?
by Darren Nguyen 1F
Sun Nov 03, 2019 7:58 pm
Forum: Electronegativity
Topic: Electron affinity vs electronegativity
Replies: 4
Views: 61

Electron affinity vs electronegativity

Is there a difference?
by Darren Nguyen 1F
Tue Oct 29, 2019 7:31 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: What is the x, y, z?
Replies: 4
Views: 82

What is the x, y, z?

In there configuration for Carbon there was a 2px and 2py. What does that mean and do we have to write those?
by Darren Nguyen 1F
Tue Oct 29, 2019 7:10 pm
Forum: Electronegativity
Topic: Is there a relationship between ionization energy and electronegativity?
Replies: 2
Views: 41

Is there a relationship between ionization energy and electronegativity?

It seems that more electronegative elements have low ionization energy, which makes sense conceptually? Is that coincidence or is there a relationship?
by Darren Nguyen 1F
Tue Oct 29, 2019 7:08 pm
Forum: Electronegativity
Topic: Exceptions to ionization energy trend?
Replies: 2
Views: 42

Exceptions to ionization energy trend?

What are the exceptions to the trend on the periodic table?
by Darren Nguyen 1F
Tue Oct 29, 2019 7:06 pm
Forum: Octet Exceptions
Topic: Can P,S,Cl have less than 8 electrons?
Replies: 3
Views: 55

Can P,S,Cl have less than 8 electrons?

Or just more?
by Darren Nguyen 1F
Mon Oct 21, 2019 9:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Where to find what material you missed if you missed a class?
Replies: 4
Views: 66

Where to find what material you missed if you missed a class?

Is there an outline of what is covered each class or access to the slides somewhere?
by Darren Nguyen 1F
Mon Oct 14, 2019 9:54 am
Forum: Administrative Questions and Class Announcements
Topic: Where are the problems for Quantum World?
Replies: 2
Views: 29

Where are the problems for Quantum World?

I don't see a section 1A. Is this because I'm using the 6th edition?
by Darren Nguyen 1F
Sun Oct 13, 2019 8:31 pm
Forum: Photoelectric Effect
Topic: Avogadro's number
Replies: 7
Views: 129

Re: Avogadro's number

Any time you go from molecules to moles or vice versa it's involved
by Darren Nguyen 1F
Sun Oct 13, 2019 8:24 pm
Forum: DeBroglie Equation
Topic: When to use DeBroglie Equation
Replies: 16
Views: 321

Re: When to use DeBroglie Equation

Not light because it doesn't have mass
by Darren Nguyen 1F
Tue Oct 08, 2019 5:41 pm
Forum: Molarity, Solutions, Dilutions
Topic: Clarification for problem G.21?
Replies: 3
Views: 98

Clarification for problem G.21?

We did this during discussion but I didn't understand something. When going from grams to moles, he did 0.500 g K2S / 110.27 g * 2 mol K / 1 mol KCl. What was that 2 mol K per 1 mol KCl part? When do we need to do that?
by Darren Nguyen 1F
Thu Oct 03, 2019 4:53 pm
Forum: Limiting Reactant Calculations
Topic: Fundamentals M.17
Replies: 6
Views: 138

Re: Fundamentals M.17

Samuel Tzeng 1H wrote:Molar mass of XA = total mass - mass of H2O


How do I get total mass?
by Darren Nguyen 1F
Thu Oct 03, 2019 4:39 pm
Forum: Limiting Reactant Calculations
Topic: Fundamentals M.17
Replies: 6
Views: 138

Fundamentals M.17

HA + XOH makes H2O + XA I solved for the moles of the reactants: 0.0106 mol HA and 0.012 mol XOH. So HA is limiting. Meaning 0.0106 moles of XA are being produced. I need theoretical yield in grams now, but I need molar mass of XA for that right? How do I find that? Or if I'm wrong somewhere else le...
by Darren Nguyen 1F
Thu Oct 03, 2019 2:43 pm
Forum: Limiting Reactant Calculations
Topic: M. Limiting Reactants
Replies: 4
Views: 63

Re: M. Limiting Reactants

A) The equation is balanced so we can jump right into it. There is a 6:2 ratio on the reactant side, but 12:5 moles are being used in the experiment. By comparing the ratios we see the 5 mol BrF 3 is in excess. B) The number of moles of the limiting reactant (CLO 2 ) will determine how much product ...
by Darren Nguyen 1F
Thu Oct 03, 2019 2:43 pm
Forum: Limiting Reactant Calculations
Topic: M. Limiting Reactants
Replies: 4
Views: 63

Re: M. Limiting Reactants

A) The equation is balanced so we can jump right into it. There is a 6:2 ratio on the reactant side, but 12:5 moles are being used in the experiment. By comparing the ratios we see the 5 mol BrF 3 is in excess. B) The number of moles of the limiting reactant (CLO 2 ) will determine how much product ...
by Darren Nguyen 1F
Thu Oct 03, 2019 2:28 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular formula
Replies: 2
Views: 59

Re: Molecular formula

You use "(molar mass of ACTUAL molecule / molar mass of emirical formula)" any time the question asks for molecular formula. Whatever factor it turns out to be, you multiply each atom in the empirical formula with it. This will give you molecular formula.
by Darren Nguyen 1F
Wed Oct 02, 2019 11:30 pm
Forum: Ideal Gases
Topic: Module Questions- Balancing Equations
Replies: 4
Views: 150

Re: Module Questions- Balancing Equations

Subtract the total number of moles on the product side from the total number of moles on the reactant side.
by Darren Nguyen 1F
Wed Oct 02, 2019 11:13 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass
Replies: 10
Views: 151

Re: Molar Mass

You should be able to calculate it from the periodic table by looking at atomic weight. For example H2O. Hydrogen has atomic weight of 1. Oxygen in 16. 1+1+16=18.

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