CHEMISTRY COMMUNITY

Alma Cruz 1A

"HCOONa...Matata, what a wonderful phrase" -The Lion King & Chemistry

Alma Cruz 1A

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

-2 Na

Alma Cruz 1A

While writing equilibrium equations with acids and bases, does the order of reactants matter? (Are acids always written first in an equation? )

Alma Cruz 1A

When writing the equilibrium equations, is it necessary to state whether the acids/bases are considered liquids (l) or aqueous(aq)?

Alma Cruz 1A

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!

Alma Cruz 1A

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+

Alma Cruz 1A

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.

Alma Cruz 1A

Does chemical equilibrium only work and be applied to when all reactant and products are in gas phase?
Thanks in advance.

Alma Cruz 1A

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?

Alma Cruz 1A

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.

Alma Cruz 1A

Hello,
I think that Nahal meant to say 2n to the power of 2+, as in two extra protons.
I may be wrong though.

Alma Cruz 1A

Jynelle, electron affinity increases from down to up and left to right on the periodic table.

Alma Cruz 1A

Okay, thank you!

Alma Cruz 1A

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

Alma Cruz 1A

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...

Alma Cruz 1A

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?

Alma Cruz 1A

Is it a given rule that 4s has slightly less energy than 3d for both Potassium and Calcium?

Alma Cruz 1A

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.

Alma Cruz 1A

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...

Alma Cruz 1A

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...

Alma Cruz 1A

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.

CHEMISTRY COMMUNITY

Search found 21 matches

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

Equilibrium Equations with acids

Question 12.3

Chapter 3, Question 73

Chapter 3, Question 61

Equilibrium Constant

Chemical Equilibrium

Lewis Base and Lewis Acid

Re: Electron Configurations

Re: Unpaired electrons

Re: Electron Affinity Trend

Re: Question 2.49

Re: Electron Configuration

Re: Electron configurations

Question 2.49

Re: Electron Configuration

Re: Amplitude versus wavelength

Chapter 1: Exercise 15

Significant Figures involving constants

Re: Whole Number Coefficients