Search found 19 matches

by Grace Lee 3G
Sat Dec 09, 2017 11:05 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic Ionic Radius
Replies: 2
Views: 208

Isoelectronic Ionic Radius

From the midterm practice test,

6. a) Arrange S2-, Cl-, and P3- in order of increasing ionic radius.

Since they all have the same number of electrons, wouldn't their radii be the same length?
by Grace Lee 3G
Sat Dec 09, 2017 10:44 pm
Forum: Photoelectric Effect
Topic: Midterm Practice Test #4b
Replies: 3
Views: 866

Midterm Practice Test #4b

A newly designed laser pointer with a certain frequency is pointed at a sodium metal surface. An electron is ejected from the metal surface with wavelength 1.10 nm. What is the frequency of the light from the laser pointer? The work function of sodium is 150.6 kJ∙mol-1. I got 2.89 x 10^17 Hz and was...
by Grace Lee 3G
Thu Dec 07, 2017 10:47 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Electron Withdrawing Power
Replies: 3
Views: 218

Electron Withdrawing Power

What is an atom's electron withdrawing power? Is it the same as electronegativity?
by Grace Lee 3G
Wed Dec 06, 2017 9:31 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Relative Acidity Concept Question
Replies: 4
Views: 321

Relative Acidity Concept Question

If an atom has a higher electronegativity, is it a stronger acid?
by Grace Lee 3G
Mon Dec 04, 2017 7:56 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Chem. Equilibrium Part 3 Post-Assess. #19
Replies: 3
Views: 358

Re: Chem. Equilibrium Part 3 Post-Assess. #19

@Suhail's reply

I know when we assume x is small we can drop the -x, but how come the square after .0482 is dropped as well? Like in the first equation it is .0482^2-x but the second equation is just .0482.
by Grace Lee 3G
Mon Dec 04, 2017 4:56 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Chem. Equilibrium Part 3 Post-Assess. #19
Replies: 3
Views: 358

Chem. Equilibrium Part 3 Post-Assess. #19

19. 0.482 mol N2 and 0.933 mol O2 are placed in a 10.0 L reaction vessel and form N2O (dinitrogen oxide): 2N2(g) + O2(g) ⇌ 2N2O(g) KC = 2.0 x 10^-37 What is the composition of the equilibrium mixture? A. [N2] = 0.0482 mol.L-1; [O2] = 0.0933 mol.L-1; [N2O] = 6.6 x 10-21 mol.L-1 B. [N2] = 0.0933 mol.L...
by Grace Lee 3G
Wed Nov 29, 2017 11:00 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Chem. Equilibrium Part 2 Post-Module Assess. #26 [ENDORSED]
Replies: 2
Views: 345

Chem. Equilibrium Part 2 Post-Module Assess. #26 [ENDORSED]

26. A mixture initially consisting of 0.250 N2 (g) and 0.500 M H2 (g) reacts to form NH3 (g) which is 0.15 M NH3 (g) at equilibrium. Calculate the concentration of N2 (g) at equilibrium for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g).

A. 0.18 M

B. 0.10 M

C. 0.33 M

D. 0.40 M
by Grace Lee 3G
Wed Nov 29, 2017 9:21 pm
Forum: Ideal Gases
Topic: Chem. Equilibrium Part 1B Post-Module Assess. #44 [ENDORSED]
Replies: 1
Views: 305

Chem. Equilibrium Part 1B Post-Module Assess. #44 [ENDORSED]

Calculate the concentration of CO(g) in mol.m^-3 at 423 K and 0.8 atm using R = 8.206 × 10-5 m^3.atm.K^-1.mol^-1 and assuming only CO(g) is present. A. 23 mol.m-3 B. 2.3 mol.m-3 C. 0.23 mol.m-3 D. 4.6 mol.m-3 E. None of the above After using the ideal gas law and cancelling out the units, I'm left w...
by Grace Lee 3G
Wed Nov 29, 2017 11:03 am
Forum: Naming
Topic: 17.31 (d) (diaqua)
Replies: 1
Views: 138

17.31 (d) (diaqua)

Sodium bisoxalato (diaqua) ferrate (III)

Why is diaqua in parenthesis?
by Grace Lee 3G
Tue Nov 28, 2017 10:47 pm
Forum: Naming
Topic: Adding o to end of anion name
Replies: 1
Views: 162

Adding o to end of anion name

I know ide changes to ido, ate changes to ato, and ite changes to ito. But how can I tell if an anion originally ends in ide, ate, or ite?
by Grace Lee 3G
Tue Nov 28, 2017 10:18 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelates
Replies: 2
Views: 208

Chelates

How do ligands "form a ring of atoms"?
by Grace Lee 3G
Sat Nov 25, 2017 11:54 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: KC/KP/QC/QP
Replies: 2
Views: 2647

KC/KP/QC/QP

Sorry I'm a little confused. What's the difference between KC, KP, QC, and QP?
by Grace Lee 3G
Mon Nov 06, 2017 11:13 pm
Forum: Limiting Reactant Calculations
Topic: Post-Module Assess. #31 and #33
Replies: 1
Views: 212

Post-Module Assess. #31 and #33

For both questions: 2A + 1B ---> 3C

31. 1 mol B reacts with 2 mol A, but there is only 1 mol A present, so it is the limiting reagent.
How much of B would be used?

33. What is the maximum amount of product that can be produced?

Can someone please explain this to me?
by Grace Lee 3G
Mon Nov 06, 2017 11:07 pm
Forum: Empirical & Molecular Formulas
Topic: Post-Module Assess. #14
Replies: 2
Views: 231

Re: Post-Module Assess. #14

Thanks!
by Grace Lee 3G
Mon Nov 06, 2017 9:30 pm
Forum: Empirical & Molecular Formulas
Topic: Post-Module Assess. #14
Replies: 2
Views: 231

Post-Module Assess. #14

339.20 g of a cobalt metal is reacted with fluorine gas to produce 996.08 g of a compound. What is the empirical formula of the new compound?

How do I solve this?
by Grace Lee 3G
Mon Nov 06, 2017 11:04 am
Forum: Lewis Structures
Topic: 11/5 Review Sess. [S3N3]^-1
Replies: 2
Views: 336

Re: 11/5 Review Sess. [S3N3]^-1

Thanks!
by Grace Lee 3G
Sun Nov 05, 2017 10:52 pm
Forum: Lewis Structures
Topic: 11/5 Review Sess. [S3N3]^-1
Replies: 2
Views: 336

11/5 Review Sess. [S3N3]^-1

How would the Lewis Structure for [S3N3]^-1 look like? Is it circular?
by Grace Lee 3G
Mon Oct 30, 2017 3:06 pm
Forum: Formal Charge and Oxidation Numbers
Topic: 3.49 (c) Oxygen's electrons
Replies: 3
Views: 329

3.49 (c) Oxygen's electrons

How come the solutions manual shows oxygen as having 5 electrons when the periodic table's oxygen has 6 electrons?
by Grace Lee 3G
Sun Oct 22, 2017 5:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2.43 (a) Silver
Replies: 4
Views: 296

2.43 (a) Silver

How come the ground-state electron configuration for silver is [Kr]4d^10 5s^1? I put [Kr]4d^9 5s^2 as my answer but I don't seem to understand how that's incorrect.

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