Search found 21 matches

by Alma Cruz 1A
Mon Jul 31, 2017 12:10 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7578
Views: 1012592

Re: Post All Chemistry Jokes Here

"HCOONa...Matata, what a wonderful phrase" -The Lion King & Chemistry
by Alma Cruz 1A
Sun Jul 30, 2017 9:26 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7578
Views: 1012592

Re: Post All Chemistry Jokes Here

What do you call a fish that is only made up of two sodium atoms?

-2 Na
by Alma Cruz 1A
Sun Jul 30, 2017 10:45 am
Forum: Bronsted Acids & Bases
Topic: Equilibrium Equations with acids
Replies: 1
Views: 127

Equilibrium Equations with acids

While writing equilibrium equations with acids and bases, does the order of reactants matter? (Are acids always written first in an equation? )
by Alma Cruz 1A
Sat Jul 29, 2017 1:01 pm
Forum: Conjugate Acids & Bases
Topic: Question 12.3
Replies: 2
Views: 382

Question 12.3

When writing the equilibrium equations, is it necessary to state whether the acids/bases are considered liquids (l) or aqueous(aq)?
by Alma Cruz 1A
Sat Jul 22, 2017 8:10 pm
Forum: Ionic & Covalent Bonds
Topic: Chapter 3, Question 73
Replies: 1
Views: 218

Chapter 3, Question 73

I was looking at the solutions manual for question 73 in chapter 3 and noticed that there are numbers next to the element listed when asked to order them in increasing electronegativity: In(1.78)<Sn(1.96)<Sb(2.05)<Se(2.55) Can someone please explain where the numbers come from? Thanks in advance!
by Alma Cruz 1A
Sat Jul 22, 2017 7:45 pm
Forum: Lewis Structures
Topic: Chapter 3, Question 61
Replies: 1
Views: 174

Chapter 3, Question 61

When drawing lewis structures and finding their formal charge, if we end up with a positive or negative formal charge, do we add the charge next to the element or do we add it around the brackets
Ex) [molecular compound] ^2+
by Alma Cruz 1A
Wed Jul 19, 2017 5:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant
Replies: 2
Views: 218

Equilibrium Constant

I was reading over the course reader and was wondering if there is a difference between K_c=[C]^c[D]^d/[A]^a[B]^b and K_p=[Products]/[Reactants] ?

Thank you in advance.
by Alma Cruz 1A
Wed Jul 19, 2017 3:19 pm
Forum: Ideal Gases
Topic: Chemical Equilibrium
Replies: 3
Views: 301

Chemical Equilibrium

Does chemical equilibrium only work and be applied to when all reactant and products are in gas phase?
Thanks in advance.
by Alma Cruz 1A
Sun Jul 16, 2017 9:07 pm
Forum: Lewis Structures
Topic: Lewis Base and Lewis Acid
Replies: 1
Views: 178

Lewis Base and Lewis Acid

Can someone please explain the difference between a lewis acid and a lewis base?
How can we determine which is the acid or base in an equation or structure, if given one?
by Alma Cruz 1A
Sun Jul 16, 2017 8:20 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations
Replies: 4
Views: 342

Re: Electron Configurations

The periodic table is grouped into four groups, the s,d,p, and f group. One has to use the periodic table and go off the "long" or "short" version of the electron configuration with the element given.
by Alma Cruz 1A
Sun Jul 16, 2017 8:08 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Unpaired electrons
Replies: 4
Views: 414

Re: Unpaired electrons

Hello,
I think that Nahal meant to say 2n to the power of 2+, as in two extra protons.
I may be wrong though.
by Alma Cruz 1A
Sun Jul 16, 2017 6:30 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity Trend
Replies: 3
Views: 386

Re: Electron Affinity Trend

Jynelle, electron affinity increases from down to up and left to right on the periodic table.
by Alma Cruz 1A
Tue Jul 11, 2017 8:41 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question 2.49
Replies: 2
Views: 272

Re: Question 2.49

Okay, thank you!
by Alma Cruz 1A
Sun Jul 09, 2017 9:49 pm
Forum: Properties of Light
Topic: Electron Configuration
Replies: 4
Views: 273

Re: Electron Configuration

How do we know when we are able to use the "shortcut"? Or will both be accepted?
By shortcut, I mean using the noble gas? [He] 2s^2, 2p^3
by Alma Cruz 1A
Sun Jul 09, 2017 9:17 pm
Forum: Quantum Numbers and The H-Atom
Topic: Electron configurations
Replies: 3
Views: 319

Re: Electron configurations

Just like Sandra said, there may not be any particular reason for writing the electron configuration shorter. We may be asked to write them out both ways, using the original element, or using its noble gas. We use the noble gas from the previous row the actual element is on when using the short vers...
by Alma Cruz 1A
Sun Jul 09, 2017 9:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question 2.49
Replies: 2
Views: 272

Question 2.49

I understand part a, b, and c of this question, but can someone please explain part d) W. Why the number of valence electrons for W is 20?
by Alma Cruz 1A
Sun Jul 09, 2017 8:45 pm
Forum: Student Social/Study Group
Topic: Electron Configuration
Replies: 2
Views: 297

Re: Electron Configuration

Is it a given rule that 4s has slightly less energy than 3d for both Potassium and Calcium?
by Alma Cruz 1A
Sun Jul 02, 2017 8:37 pm
Forum: Properties of Light
Topic: Amplitude versus wavelength
Replies: 4
Views: 304

Re: Amplitude versus wavelength

Page 45 of the course reader also gives a summary, explaining the inverse relationship between wavelength and frequency in regards to electrons being ejected and the number of photons present.
by Alma Cruz 1A
Sun Jul 02, 2017 12:45 pm
Forum: Properties of Light
Topic: Chapter 1: Exercise 15
Replies: 4
Views: 382

Chapter 1: Exercise 15

For exercise 1.15, I understand that we have to use Rydberg's equation to solve for n2. However, when I compared my answers to the one in the solutions manual, I noticed that frequency is not included. My question is, why do we not include frequency(lambda) when using Rydberg's equation when solving...
by Alma Cruz 1A
Sun Jul 02, 2017 12:35 pm
Forum: Significant Figures
Topic: Significant Figures involving constants
Replies: 2
Views: 398

Significant Figures involving constants

When calculating problems involving constants such as the speed of light, do we use the number provided in the solutions manual (c=2.998x10^8) or the one provided in the list of equations and constants (c=2.99792x10^8)? In other words, how do we know how many significant figures to correctly use and...
by Alma Cruz 1A
Sat Jul 01, 2017 2:13 pm
Forum: Empirical & Molecular Formulas
Topic: Whole Number Coefficients
Replies: 5
Views: 457

Re: Whole Number Coefficients

Try to multiply it by a number that will give you the decimal closest to a whole number (if yet not given a whole number).
For example, let's say your number is 1.33, one would multiply it by a 3 in order to obtain 3.9970..., which would give you the closest to a whole number, 4.

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