Search found 30 matches

by Jackie Ngo 1C
Sun Dec 09, 2018 11:44 pm
Forum: Lewis Acids & Bases
Topic: table 12.6
Replies: 1
Views: 177

table 12.6

"Correlation of Acid Strength and Oxidation Number": is this chart basically saying that in order for an acid to be stronger, there has to be more atoms in the molecule? (Bigger the molecule, the stronger the acid?) Or is it more complex than that? I remember the last part of the final, it...
by Jackie Ngo 1C
Sun Dec 09, 2018 11:39 pm
Forum: Lewis Structures
Topic: drawing complex lewis structures
Replies: 1
Views: 191

drawing complex lewis structures

how does one draw the lewis structure of a molecule as complex as CH3COOH? it's written in that order for a reason right? I totally get how to draw the simple ones like CH4, but for complex molecules, I don't even know where to start. Help please!! thanks!!!
by Jackie Ngo 1C
Sun Dec 09, 2018 11:17 pm
Forum: Amphoteric Compounds
Topic: acidic oxide [ENDORSED]
Replies: 3
Views: 237

acidic oxide [ENDORSED]

hi!! can someone dumb down the concept of acidic oxides for me please?? I'm trying to understand it from the textbook but it's so complex and I really don't get it, as many times as I reread it over and over again. thankssss!!
by Jackie Ngo 1C
Sun Dec 09, 2018 11:08 pm
Forum: Lewis Acids & Bases
Topic: Lewis and Bronsted-Lowry Acids and Bases
Replies: 1
Views: 113

Lewis and Bronsted-Lowry Acids and Bases

What's the main difference between them two? The textbook is really confusing me
by Jackie Ngo 1C
Sun Dec 09, 2018 8:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885903

Re: Post All Chemistry Jokes Here

"you must be made of copper and tellurium! because you're so CuTe" ;)
by Jackie Ngo 1C
Sun Dec 09, 2018 8:25 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885903

Re: Post All Chemistry Jokes Here

"Why do chemists find working with ammonia easy?"
"Because it's some pretty basic stuff"
by Jackie Ngo 1C
Sun Dec 09, 2018 8:22 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885903

Re: Post All Chemistry Jokes Here

"What's the chemical formula for banana?"
"BaNa2"
by Jackie Ngo 1C
Sun Dec 09, 2018 8:20 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885903

Re: Post All Chemistry Jokes Here

"Anyone know any jokes about sodium?"
"Na"
by Jackie Ngo 1C
Sun Dec 09, 2018 8:09 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 885903

Re: Post All Chemistry Jokes Here

"What kind of bear is soluble in water?"
"A polar bear!!!"
by Jackie Ngo 1C
Sun Dec 02, 2018 11:52 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: chelates
Replies: 5
Views: 107

chelates

do chelates have a distinct shape? or do they just need to have the basis of a central atom?
by Jackie Ngo 1C
Sun Dec 02, 2018 11:50 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: what is a ligand?
Replies: 8
Views: 148

what is a ligand?

sorry this is a really dumb question, but is a ligand basically an atom that is attached to a central atom? what is it about ligands that makes them so important in this chapter?
by Jackie Ngo 1C
Sun Dec 02, 2018 11:47 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: identifying strong/weak acids and bases
Replies: 1
Views: 59

identifying strong/weak acids and bases

how can you identify if a molecule is a strong acid, strong base, weak acid, or weak base? is it just memorization or can you use the periodic table trends?
by Jackie Ngo 1C
Sun Nov 25, 2018 11:50 pm
Forum: Hybridization
Topic: degeneracy
Replies: 2
Views: 68

degeneracy

Why is degeneracy important when it comes to hybridization? What role does it play onto hybrid orbitals?
by Jackie Ngo 1C
Sun Nov 25, 2018 11:47 pm
Forum: Hybridization
Topic: Test 3
Replies: 7
Views: 134

Re: Test 3

lavelle hasn't mentioned the same exact number of problems yet, but if it's consistent with his previous two tests, it should be around 5-8 questions with several parts per question.
by Jackie Ngo 1C
Sun Nov 25, 2018 11:38 pm
Forum: Hybridization
Topic: sigma/pi bonds
Replies: 7
Views: 84

Re: sigma/pi bonds

If you went to Lavelle's lectures, you'd know that he made the pi bond and sigma bond analogy with his fingers -- if you put both your index fingers up and parallel to each other, that represents a pi bond, which is a bond that cannot rotate, whereas if you put the end of your index fingers together...
by Jackie Ngo 1C
Sun Nov 11, 2018 11:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 5
Views: 91

Re: Molecular Shape

The difference between a bent molecule and a linear one is that the bent molecule has lone pairs whereas the linear one doesn't. This makes sense because the lone pair on the central atom creates a charge that pushes the outside atoms away, consequently bending the molecule.
by Jackie Ngo 1C
Sun Nov 11, 2018 11:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How do you utilize the VSEPR model?
Replies: 4
Views: 60

How do you utilize the VSEPR model?

In my notes from Lavelle's lecture, it says that the "VSEPR Model explains experimentally observed shape of molecules," but how so? I have a whole chart with arrows pointing down but I'm not exactly sure what it means. If someone can decipher / elaborate on it, that'd be great!!
by Jackie Ngo 1C
Sun Nov 11, 2018 11:35 pm
Forum: Coordinate Covalent Bonds
Topic: Shape of the Molecule Contributes to Strength of Interaction
Replies: 2
Views: 188

Shape of the Molecule Contributes to Strength of Interaction

In this section of the notes from Friday's lecture, it was said that Pentane and 2,2-Dimethylpropane have the same molecular formula, but are physically shaped differently. How is that so? I jotted the notes down really fast so after glancing over them again, I don't quite get it conceptually.
by Jackie Ngo 1C
Sun Nov 04, 2018 5:05 pm
Forum: Lewis Structures
Topic: 12b from the GarBreadium worksheet
Replies: 3
Views: 53

12b from the GarBreadium worksheet

"draw the lowest energy Lewis structure for ClO4-" --> I know that if there's a minus sign in the molecular formula, you'd have to take it into account when adding up the valence electrons and drawing it into your Lewis structure, but when you had the brackets over the entire Lewis structu...
by Jackie Ngo 1C
Sun Nov 04, 2018 4:51 pm
Forum: Sigma & Pi Bonds
Topic: Midterm1
Replies: 10
Views: 279

Midterm1

Do we need to know Sigma and Pi bonds for this upcoming midterm? From the past review sessions I've been going to, I haven't seen any TAs go over this, so I'm guessing it's probably not going to be on it??
by Jackie Ngo 1C
Sun Nov 04, 2018 4:49 pm
Forum: Electronegativity
Topic: (10d) are Ionization Energy trends different from Electron Affinity trends?
Replies: 1
Views: 51

(10d) are Ionization Energy trends different from Electron Affinity trends?

This is from problem 10d from the Garbreadium worksheet problems given at Lyndon's Saturday review session! It was said that the answer for "rank the following in order of increasing ionization energies" for the elements C, N, O, and F are C<O<N<F. However, Lyndon also brought up that for ...
by Jackie Ngo 1C
Sun Oct 28, 2018 10:19 pm
Forum: Lewis Structures
Topic: Dots in Lewis Stucture
Replies: 14
Views: 275

Re: Dots in Lewis Stucture

It doesn't matter where the dots are placed as long as they're distributed as evenly as possible.
by Jackie Ngo 1C
Sun Oct 28, 2018 10:04 pm
Forum: Ionic & Covalent Bonds
Topic: Question regarding ionic bonds
Replies: 9
Views: 118

Re: Question regarding ionic bonds

Yes, always! And that's because ionic bonds are formed between a cation and anion, and cations are usually within metals, and anions are usually within nonmetals.
by Jackie Ngo 1C
Sun Oct 28, 2018 9:49 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity Trend
Replies: 9
Views: 181

Re: Electron Affinity Trend

As you travel up and towards the right across the periodic table, elements become more and more electronegative, therefore have a higher electron affinity (attractiveness). This is because as you go right, there's an increase in valence electrons, and electrons are more attracted to valence shells t...
by Jackie Ngo 1C
Sun Oct 21, 2018 11:58 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Uncertainty Question
Replies: 3
Views: 130

Heisenberg Uncertainty Question

I am confused about the overall concept of the Heisienberg Uncertainty Equation, as in how it derived? My TA explained in in my section, and that honestly confused me even more. I tried googling it too, but it just doesn't clear anything up for me. How can you determine the general position/velocity...
by Jackie Ngo 1C
Sun Oct 21, 2018 11:53 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: h with a line through it?
Replies: 8
Views: 151

Re: h with a line through it?

h bar is essentially another way to say h/2pi. it can also be called Planck's constant, in case you didn't already know (I just discovered this in my discussion section)
by Jackie Ngo 1C
Sun Oct 21, 2018 11:50 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Energy levels of orbitals?
Replies: 10
Views: 113

Re: Energy levels of orbitals?

The order would go s<p<d<f, and that is because s is known to typically be the ground state, and in order for it jump to another orbital, it needs to be excited. Therefore, more energy is put into the system to stabilize it at that higher orbital --> energy level goes up
by Jackie Ngo 1C
Thu Oct 04, 2018 11:48 pm
Forum: Balancing Chemical Reactions
Topic: Mole Coefficients in Chemical Equations
Replies: 6
Views: 257

Mole Coefficients in Chemical Equations

for example, in 2Na + 2H2O --> 2NaOH + H2, the formula, in Mole terms is essentially 2 moles + 2 moles --> 2 moles + 1 mole. Why aren't the mole coefficients equal on both sides?
by Jackie Ngo 1C
Thu Oct 04, 2018 11:39 pm
Forum: Significant Figures
Topic: sig figs urgent question!
Replies: 12
Views: 513

sig figs urgent question!

Hello! I have a quick general question on significant figures. If 0.001 has one sig fig, and 1.00 has three sig figs, how many sig figs would 1.001 have? Would you ignore the 0's in between the two 1's and say it has 2 sig figs, or would you take it into consideration and call it 4 sig figs? Thank y...
by Jackie Ngo 1C
Thu Oct 04, 2018 11:30 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: writing the formula of a molecule
Replies: 5
Views: 231

writing the formula of a molecule

hi! I'm stuck on question E9 of the Review of Chemical & Physical Principles. it lists that I need to write magnesium sulfate heptahydrate as a formula. how would I do that/read it? thanks so much for your time!

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