Search found 18 matches

by Alejandra Reyna 1E
Mon Jul 31, 2017 12:45 am
Forum: Conjugate Acids & Bases
Topic: Properties of an acid strong or a base weak
Replies: 1
Views: 223

Properties of an acid strong or a base weak

In comparing the acidity of Cl-O-H, Br-O-H, and I-O-H, the course reader states, "for Cl-O, Cl has a higher electronegativity than Br & I and stabilizes the VE charge on O by withdrawing e- density."

Could someone explain what this means? Thank you!
by Alejandra Reyna 1E
Sun Jul 30, 2017 11:05 pm
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted-Lowry Acids
Replies: 2
Views: 210

Lewis vs Bronsted-Lowry Acids

I am having a hard time distinguishing a lewis acid from a bronsted-lowry acid. Is there something to look for specifically when looking at chemical formulas?
by Alejandra Reyna 1E
Sun Jul 30, 2017 4:44 pm
Forum: Bronsted Acids & Bases
Topic: HCl vs. HF
Replies: 2
Views: 214

Re: HCl vs. HF

Correct me if I am wrong but from my understanding, the difference in electronegativity between H and F is very high making the H-F bond very strong. The HF bond only dissociates partially in water making it a weak acid. I was able to read through a few forums online and formulated my answer through...
by Alejandra Reyna 1E
Thu Jul 27, 2017 4:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ka/Kb/Kc? Can we assume they'd be the same?
Replies: 1
Views: 376

Re: Ka/Kb/Kc? Can we assume they'd be the same?

Correct me if I am wrong but I believe you would label it as Ka since you are being asked to find the equilibrium constant of an acid.
by Alejandra Reyna 1E
Mon Jul 24, 2017 3:47 pm
Forum: Ideal Gases
Topic: Equilibrium Module Part 1 - Q.64
Replies: 1
Views: 192

Equilibrium Module Part 1 - Q.64

The problem states, "Calculate the concentration of CO(g) in mol.m-3 at 423 K and 0.8 atm using R = 8.206 × 10-5 m3.atm.K-1.mol-1 and assuming only CO(g) is present."

I understand: P=0.8 atm, R is given, T=423 K. How do we know what value to use for the volume? Thank you.
by Alejandra Reyna 1E
Sun Jul 23, 2017 1:08 am
Forum: Naming
Topic: HW Question 17.31
Replies: 4
Views: 402

HW Question 17.31

The problem states to write the formula for each coordination compound. My confusion is with parts C and D. Part C: tetraamminediaquacobalt(III)bromide Formula -> [Co(NH3)4(H2O)2]Br3 Part D: sodium bisoxalato(diaqua)ferrate(III) Formula -> Na[Fe(OH2)2(C2O4)2] I noticed both C and D contain diaqua bu...
by Alejandra Reyna 1E
Sun Jul 23, 2017 12:58 am
Forum: Naming
Topic: Naming Ligands
Replies: 4
Views: 343

Re: Naming Ligands

I began using this method where I wrote down the name of each formula on a notecard and placed them in front of me when working out problems. It became repetitive and stuck a little more each time. Hope this helps!
by Alejandra Reyna 1E
Fri Jul 21, 2017 2:49 am
Forum: Ionic & Covalent Bonds
Topic: HW Question 3.77
Replies: 1
Views: 524

HW Question 3.77

The problem asks which compound has bonds with greater ionic character. The options include: a) HCl or HI b) CH4 or CF4 c) CO2 or CS2 My answers were HI, CH4 and CO2. I was incorrect for parts a and b and was hoping someone could clarify as to why those bonds have a greater ionic character. Thank you!
by Alejandra Reyna 1E
Tue Jul 18, 2017 10:38 pm
Forum: Dipole Moments
Topic: Polarity vs Non-Polarity
Replies: 3
Views: 343

Polarity vs Non-Polarity

Could someone help me understand how Lewis structures help in determining polarity? I've noticed there are arrows that either point towards or away from the central atom but I do not understand why. Thank you!
by Alejandra Reyna 1E
Sun Jul 09, 2017 10:48 pm
Forum: Resonance Structures
Topic: Resonance vs. Lewis Structure?
Replies: 9
Views: 970

Re: Resonance vs. Lewis Structure?

I believe you can move the double bonds around as long as the Octet rule is being satisfied.
by Alejandra Reyna 1E
Sun Jul 09, 2017 10:45 pm
Forum: Ionic & Covalent Bonds
Topic: Effective Charge of an Atom
Replies: 2
Views: 370

Re: Effective Charge of an Atom

The effective nuclear charge is dependent on the number of electrons present in an atom because the nuclear charge increases from bottom to top and right to left. For example, Lithium (row 2) would have a higher nuclear charge than Potassium (row 4). Another example would be Carbon (column 14) havin...
by Alejandra Reyna 1E
Sun Jul 09, 2017 10:30 pm
Forum: *Shrodinger Equation
Topic: Shrodinger Equation
Replies: 1
Views: 248

Shrodinger Equation

I believe somebody asked a similar question, but I wanted to make sure I wasn't missing something. Will we be applying the Shrodinger equation to anything mathematically or simply conceptually?
by Alejandra Reyna 1E
Wed Jul 05, 2017 7:58 pm
Forum: DeBroglie Equation
Topic: De Broglie Equation - Course Reader
Replies: 2
Views: 339

De Broglie Equation - Course Reader

In the worked examples from the course reader, one question states, "Calculate the De Broglie wavelength of an electron traveling at 5.3 x 10^6 m.s-1". In the provided solution, there is a mass of 9.11 x 10^-31 kg. I was wondering if this was something that was given to us or calculated? I...
by Alejandra Reyna 1E
Sun Jul 02, 2017 11:03 pm
Forum: Empirical & Molecular Formulas
Topic: Whole Number Coefficients
Replies: 5
Views: 457

Re: Whole Number Coefficients

I definitely agree with Dabin Kang. It becomes much easier when you convert to fractions rather than multiplying by big numbers from the beginning. It lessens the time to determine your final formulas and is a lot simpler.
by Alejandra Reyna 1E
Sun Jul 02, 2017 9:03 pm
Forum: Molarity, Solutions, Dilutions
Topic: Problem G.25 in Fundamentals
Replies: 3
Views: 292

Problem G.25 in Fundamentals

The problem states: "To explore this question, suppose that you prepare a solution of a supposedly active substance, X, with a molarity of 0.10 mol.L-1. Then you dilute 10. mL of that solution by doubling the volume, doubling it again and so on, for 90 doublings in all. How many molecules of X ...
by Alejandra Reyna 1E
Sun Jul 02, 2017 7:15 pm
Forum: Molarity, Solutions, Dilutions
Topic: homework G5
Replies: 6
Views: 510

Re: homework G5

I could be wrong, but I believe Professor Lavelle said we would be given the chemical formula for our exams. Please correct me if I am wrong!
by Alejandra Reyna 1E
Sat Jul 01, 2017 5:00 pm
Forum: Molarity, Solutions, Dilutions
Topic: Problem E.15 in Fundamentals
Replies: 3
Views: 353

Re: Problem E.15 in Fundamentals

Oh, I get it now! Thank you!
by Alejandra Reyna 1E
Sat Jul 01, 2017 3:01 pm
Forum: Molarity, Solutions, Dilutions
Topic: Problem E.15 in Fundamentals
Replies: 3
Views: 353

Problem E.15 in Fundamentals

Problem: The molar mass of the metal hydroxide M(OH)2 is 74.10 g.mol-1. What is the molar mass of the sulfide of this metal? I am having a lot of trouble approaching the question because I am still very unsure as to what it is asking. I've tried looking at the solution but became more confused. Any ...

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