Search found 33 matches

by chrisdinkel_4E
Wed Feb 13, 2019 10:54 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Internal Energy and Enthalpy
Replies: 3
Views: 10

Internal Energy and Enthalpy

Can someone please explain to me the relationship between Internal Energy (U) and Enthalpy (H)
by chrisdinkel_4E
Wed Feb 13, 2019 10:53 am
Forum: Calculating Work of Expansion
Topic: Integrals
Replies: 4
Views: 20

Integrals

I'm assuming we have to know the concept behind the integral equations (for example the reversible isothermal reaction), but will we need to know how to use it in mathematical practice?
by chrisdinkel_4E
Sun Dec 09, 2018 1:14 am
Forum: Electronegativity
Topic: Polarizing Power and Polarizability
Replies: 2
Views: 34

Polarizing Power and Polarizability

why does Li+ have more polarizing power than Mg^2+ even though Mg^2+ has a stronger positive charge?
Why is Br- more polarizable than P^3- for the same logic??
by chrisdinkel_4E
Sat Dec 08, 2018 7:18 pm
Forum: Naming
Topic: Do we need to know which atom in the ligand is attached to the central atom?
Replies: 1
Views: 21

Do we need to know which atom in the ligand is attached to the central atom?

Do we need to know which atom in the ligand is attached to the central atom? For example, do we need to write out -kE (E being the attached atom) when writing the formula name out?
by chrisdinkel_4E
Sat Dec 08, 2018 6:49 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Memorizing Acids by name
Replies: 3
Views: 44

Memorizing Acids by name

Should we memorize all of the strong acids/bases by name? Or are they going to give us the molecular formula?
I can just imagine an easy question that could be asked but not knowing the formula for the acid messes everything up
by chrisdinkel_4E
Sat Dec 08, 2018 5:03 pm
Forum: Bronsted Acids & Bases
Topic: How to tell the difference between Lewis + Bronsted
Replies: 1
Views: 33

How to tell the difference between Lewis + Bronsted

I understand the electron/proton acceptor/donor concept, but how can you tell if a molecule is a Lewis acid/base or Bronsted acid/base?
Examples would be much appreciated
by chrisdinkel_4E
Sat Dec 08, 2018 4:35 pm
Forum: Bronsted Acids & Bases
Topic: Why is this not a proton transfer. (7th ed. 6A.9)
Replies: 1
Views: 38

Why is this not a proton transfer. (7th ed. 6A.9)

in the equation CH3COOH + NH3 ---> CH3CONH2 + H2O
Why is this not a proton transfer?
It seems to me that the H+ proton from the NH3 combines with the OH from the compound, no?
by chrisdinkel_4E
Sat Dec 08, 2018 12:57 pm
Forum: Naming
Topic: Latin Names
Replies: 2
Views: 24

Latin Names

Is it expected that we know the Latin names, like Ferrum (Fe) for example
by chrisdinkel_4E
Sat Dec 08, 2018 12:35 pm
Forum: Naming
Topic: Naming
Replies: 3
Views: 38

Re: Naming

sheesh I ain't ready
by chrisdinkel_4E
Sat Dec 08, 2018 11:59 am
Forum: Naming
Topic: Naming
Replies: 3
Views: 38

Naming

We fr need to memorize all those names???
by chrisdinkel_4E
Sat Dec 08, 2018 11:52 am
Forum: Dipole Moments
Topic: Dipole Moments signifying polarity
Replies: 2
Views: 26

Dipole Moments signifying polarity

how can we know if the dipole moment is strong enough for the molecule to be considered "polar"?
by chrisdinkel_4E
Fri Dec 07, 2018 4:08 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7023
Views: 772335

Re: Post All Chemistry Jokes Here

VSPER? I hardly know her!!
by chrisdinkel_4E
Fri Nov 30, 2018 8:30 am
Forum: Electronegativity
Topic: SO2
Replies: 1
Views: 35

SO2

SO2 has a bent shape because of the lone pair. Because the electronegativities are different between S and O, there is said to be a dipole moment with the O's being negative and the S being positive.

Where does the Lone Pair come into play though? why doesn't the lone pair cancel S's positive charge?
by chrisdinkel_4E
Thu Nov 29, 2018 9:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Bipyramidal
Replies: 6
Views: 76

Trigonal Bipyramidal

When replacing an atom with a lone pair (molecule with 3 bonds and 2 electron pairs), why do you take away from the equatorial atoms and not the axial atoms?
by chrisdinkel_4E
Tue Nov 27, 2018 2:12 am
Forum: Electronegativity
Topic: Electronegativity
Replies: 4
Views: 46

Electronegativity

do we have to determine relative Electronegativites by periodic trends or is it given?
by chrisdinkel_4E
Tue Nov 27, 2018 2:06 am
Forum: Hybridization
Topic: hybridization and radicals
Replies: 2
Views: 26

hybridization and radicals

How do radicals influence hybridization of an atom?
by chrisdinkel_4E
Mon Nov 05, 2018 12:05 am
Forum: Octet Exceptions
Topic: EXPANDED OCTET
Replies: 5
Views: 86

EXPANDED OCTET

Why can group 13 elements have incomplete octets?
by chrisdinkel_4E
Sun Nov 04, 2018 9:05 pm
Forum: Lewis Structures
Topic: Garlic Bread Review 12b
Replies: 2
Views: 32

Re: Garlic Bread Review 12b

12b) Draw the lowest energy Lewis structure for ClO4- Why is the lowest energy Lewis structure have one of the three Oxygen atoms with 6 lone pairs instead of doing a double bond with Cl and 4 lone pairs like the rest of the oxygen atoms? The formal charges are the same, either Cl has -1 or the O h...
by chrisdinkel_4E
Sun Nov 04, 2018 8:59 pm
Forum: Administrative Questions and Class Announcements
Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Replies: 121
Views: 4205

Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]

Olivia L 3D wrote:For question 12c, why is it better to have a triple bond with the two nitrogen atoms instead of double bonds on nitrogen and oxygen? The charge is both the same.


It is better to have a triple bond as opposed to a double bond because Oxygen is the more electronegative atom.
by chrisdinkel_4E
Sun Nov 04, 2018 8:54 pm
Forum: Administrative Questions and Class Announcements
Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Replies: 121
Views: 4205

Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]

For question 13A, can someone please explain why the answer is 2.681x10^-26? I got the 2.681, but for some reason I got x10^-23.
by chrisdinkel_4E
Thu Oct 25, 2018 9:12 pm
Forum: Properties of Light
Topic: Chapter 1.15 6th Edition
Replies: 2
Views: 66

Chapter 1.15 6th Edition

this question covers the rydberg equation. in the solution, it assumes that n(final) is 1 and uses that assumption to find that n(initial) is 3.
Can someone explain if this assumption is always valid? Thanks
by chrisdinkel_4E
Thu Oct 25, 2018 8:21 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic Atoms
Replies: 4
Views: 63

Re: Isoelectronic Atoms

Ahh thanks!
by chrisdinkel_4E
Thu Oct 25, 2018 8:15 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy Equation
Replies: 4
Views: 81

Heisenberg Indeterminacy Equation

Is this formula basically only used to prove why electrons cannot exist directly on the nucleus because their velocity would be higher than the speed of light?
by chrisdinkel_4E
Thu Oct 25, 2018 8:13 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic Atoms
Replies: 4
Views: 63

Isoelectronic Atoms

I am confused by if two different atom have the same valence (i.e. one atom gain/lost an electron) why they wouldn't have the same structural size.
It makes sense that they would have very different properties.
by chrisdinkel_4E
Thu Oct 25, 2018 7:59 pm
Forum: Properties of Light
Topic: Electromagnetic Spectrum
Replies: 5
Views: 95

Electromagnetic Spectrum

For test 2 specifically, is it relevant to memorize the electromagnetic spectrum?
As in, the nm boundaries for the wavelengths of light
by chrisdinkel_4E
Thu Oct 25, 2018 7:57 pm
Forum: *Shrodinger Equation
Topic: Help on how to find l, ml, and ms
Replies: 6
Views: 127

Re: Help on how to find l, ml, and ms

So, say for Ca, the quantum numbers would be:
n=4 (4th row)
l=0 (s block)
ml=0 (s block)
ms= -1/2 (2nd one of the s block)
by chrisdinkel_4E
Thu Oct 25, 2018 6:26 pm
Forum: *Shrodinger Equation
Topic: Help on how to find l, ml, and ms
Replies: 6
Views: 127

Help on how to find l, ml, and ms

Can someone please explain how to find these quantum numbers?
by chrisdinkel_4E
Sun Oct 21, 2018 9:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Exam 2
Replies: 4
Views: 86

Re: Exam 2

We will always be given equations and constants for the exams, midterm, and final.
by chrisdinkel_4E
Sun Oct 21, 2018 8:54 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Atomic Orbitals
Replies: 3
Views: 54

Re: Atomic Orbitals

The orbitals are also relevant with energy levels. For example, s-electrons have a lower energy state than p-electrons in the same shell.
Within the shell, the order is s<p<d<f.
by chrisdinkel_4E
Sun Oct 21, 2018 8:41 pm
Forum: Student Social/Study Group
Topic: Note Taking
Replies: 25
Views: 790

Re: Note Taking

Throughout the course, I have just been writing down everything that is on the powerpoint slides and some extra clarification notes from how he explains the concepts. This strategy will probably not work out well in the end because I have no idea to do the homework problems!
by chrisdinkel_4E
Sun Oct 21, 2018 8:28 pm
Forum: Properties of Light
Topic: Equations
Replies: 6
Views: 65

Re: Equations

Yes, all relevant constants will be given as well.
by chrisdinkel_4E
Thu Oct 11, 2018 7:33 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Mass percent composition [ENDORSED]
Replies: 4
Views: 171

Mass percent composition [ENDORSED]

Is mass percent composition simply the percent of each atom in a molecule based on the molar mass of each atom?
by chrisdinkel_4E
Thu Oct 11, 2018 7:31 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework Week 2
Replies: 5
Views: 89

Homework Week 2

We can choose to do problems from chemistry review and/or from the quantum world, correct?

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