Search found 21 matches
- Mon Jul 31, 2017 12:10 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2986978
Re: Post All Chemistry Jokes Here
"HCOONa...Matata, what a wonderful phrase" -The Lion King & Chemistry
- Sun Jul 30, 2017 9:26 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2986978
Re: Post All Chemistry Jokes Here
What do you call a fish that is only made up of two sodium atoms?
-2 Na
-2 Na
- Sun Jul 30, 2017 10:45 am
- Forum: Bronsted Acids & Bases
- Topic: Equilibrium Equations with acids
- Replies: 1
- Views: 297
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? )
- Sat Jul 29, 2017 1:01 pm
- Forum: Conjugate Acids & Bases
- Topic: Question 12.3
- Replies: 2
- Views: 643
Question 12.3
When writing the equilibrium equations, is it necessary to state whether the acids/bases are considered liquids (l) or aqueous(aq)?
- Sat Jul 22, 2017 8:10 pm
- Forum: Ionic & Covalent Bonds
- Topic: Chapter 3, Question 73
- Replies: 1
- Views: 429
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!
- Sat Jul 22, 2017 7:45 pm
- Forum: Lewis Structures
- Topic: Chapter 3, Question 61
- Replies: 1
- Views: 300
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+
Ex) [molecular compound] ^2+
- Wed Jul 19, 2017 5:49 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium Constant
- Replies: 2
- Views: 432
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.
Thank you in advance.
- Wed Jul 19, 2017 3:19 pm
- Forum: Ideal Gases
- Topic: Chemical Equilibrium
- Replies: 3
- Views: 577
Chemical Equilibrium
Does chemical equilibrium only work and be applied to when all reactant and products are in gas phase?
Thanks in advance.
Thanks in advance.
- Sun Jul 16, 2017 9:07 pm
- Forum: Lewis Structures
- Topic: Lewis Base and Lewis Acid
- Replies: 1
- Views: 396
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?
How can we determine which is the acid or base in an equation or structure, if given one?
- Sun Jul 16, 2017 8:20 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configurations
- Replies: 4
- Views: 821
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.
- Sun Jul 16, 2017 8:08 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Unpaired electrons
- Replies: 4
- Views: 771
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.
I think that Nahal meant to say 2n to the power of 2+, as in two extra protons.
I may be wrong though.
- Sun Jul 16, 2017 6:30 am
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity Trend
- Replies: 3
- Views: 697
Re: Electron Affinity Trend
Jynelle, electron affinity increases from down to up and left to right on the periodic table.
- Tue Jul 11, 2017 8:41 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Question 2.49
- Replies: 2
- Views: 532
Re: Question 2.49
Okay, thank you!
- Sun Jul 09, 2017 9:49 pm
- Forum: Properties of Light
- Topic: Electron Configuration
- Replies: 4
- Views: 611
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 shortcut, I mean using the noble gas? [He] 2s^2, 2p^3
- Sun Jul 09, 2017 9:17 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Electron configurations
- Replies: 3
- Views: 693
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...
- Sun Jul 09, 2017 9:01 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Question 2.49
- Replies: 2
- Views: 532
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?
- Sun Jul 09, 2017 8:45 pm
- Forum: Student Social/Study Group
- Topic: Electron Configuration
- Replies: 2
- Views: 570
Re: Electron Configuration
Is it a given rule that 4s has slightly less energy than 3d for both Potassium and Calcium?
- Sun Jul 02, 2017 8:37 pm
- Forum: Properties of Light
- Topic: Amplitude versus wavelength
- Replies: 4
- Views: 697
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.
- Sun Jul 02, 2017 12:45 pm
- Forum: Properties of Light
- Topic: Chapter 1: Exercise 15
- Replies: 4
- Views: 868
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...
- Sun Jul 02, 2017 12:35 pm
- Forum: Significant Figures
- Topic: Significant Figures involving constants
- Replies: 2
- Views: 898
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...
- Sat Jul 01, 2017 2:13 pm
- Forum: Empirical & Molecular Formulas
- Topic: Whole Number Coefficients
- Replies: 5
- Views: 1450
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.
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.