Search found 32 matches

by Andrea Raymundo 1B
Thu Jun 14, 2018 2:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: french toast #15
Replies: 3
Views: 196

Re: french toast #15

in the test you can use either bent or angular becuase they are interchangeable
by Andrea Raymundo 1B
Thu Jun 14, 2018 2:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-Shape
Replies: 6
Views: 239

Re: T-Shape

one has to realize that there are 5 regions of electron density which would usually be 120 and 90 degrees but since two of these are lon pairs it makes the angles smaller because the lone pairs push the bonds away.
by Andrea Raymundo 1B
Thu Jun 14, 2018 1:42 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: shells versus orbitals
Replies: 3
Views: 231

Re: shells versus orbitals

a shell contains orbitals (subshells)
for example in the second shell there is the s orbital and the p orbital
shell correlated to the period and subshells to the blocks
by Andrea Raymundo 1B
Thu Jun 14, 2018 1:38 pm
Forum: Bronsted Acids & Bases
Topic: bronstead vs lewis
Replies: 2
Views: 180

Re: bronstead vs lewis

not really, lewis acid is pretty much like a bronsted acid but juse deifned in a different way and same goes with lewis base and bronsted base a lewis acid is one that accepts electrons and the base donates an eelctron a bronsted acid donates a proton which technically means there is a more negative...
by Andrea Raymundo 1B
Thu Jun 14, 2018 1:34 pm
Forum: Trends in The Periodic Table
Topic: 7p orbital on periodic table
Replies: 1
Views: 106

Re: 7p orbital on periodic table

it is from Ununtrium to Ununoctium
by Andrea Raymundo 1B
Thu Jun 14, 2018 2:19 am
Forum: Photoelectric Effect
Topic: test 2 q. 7
Replies: 1
Views: 151

test 2 q. 7

the question is : COpper is used widely in electrical wiring due to its high electrical conductivity and malleability. The threshold energy or "work fucntion" of the copper atom is 7.52 *10^{-19} J . What is the maximum wavelength of light (lowest energy) you need to shine onto copper meta...
by Andrea Raymundo 1B
Thu Jun 14, 2018 1:23 am
Forum: Molarity, Solutions, Dilutions
Topic: midterm q.1c
Replies: 1
Views: 149

midterm q.1c

im confused as how to go on about this question Potassium permangante, KMnO_{4} , is an organic chemical compound used for cleaning wounds. 5.00 g of KMnO_{4} is dissolved in a 150.00 mL flask of water. If 20.00 mL of this solution is removed and placed in a new 2nd 250.00 mL flask and filled with w...
by Andrea Raymundo 1B
Thu Jun 14, 2018 1:05 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination and oxidation numbers [ENDORSED]
Replies: 1
Views: 254

coordination and oxidation numbers [ENDORSED]

what is the difference between these two numbers and how do we find them ?
by Andrea Raymundo 1B
Thu Jun 14, 2018 1:03 am
Forum: Lewis Structures
Topic: Radical HW 3.59
Replies: 6
Views: 282

Re: Radical HW 3.59

YeseniaGomez_1L wrote:I don't really understand how you all are finding radicals. For example question 3.55 asks us to identify which of the following are radicals: NO2-, CH3, OH, CH2O.
How do you know which are radicals?

radicals are those that have odd number of valence electrons
by Andrea Raymundo 1B
Thu Jun 14, 2018 12:58 am
Forum: Lewis Structures
Topic: Central atom and octet rule?
Replies: 12
Views: 584

Re: Central atom and octet rule?

Amanda 1A wrote:is there a rule to know when some atoms are okay with having less than 8 electrons? or should we just memorize some of them and hope for the best?

i think it is just memorization but its basically just group 13 and H, He, Li, Be
by Andrea Raymundo 1B
Thu Jun 14, 2018 12:56 am
Forum: Lewis Structures
Topic: Breaking the Octet Rule
Replies: 3
Views: 144

Re: Breaking the Octet Rule

victoriatanaka1C wrote:And just to clarify, the elements that can break the octet rule are H, He, Li, Be, Column 13 and Row 3 and below?

yes, group 13 can have less than 8 valence elctrons and period 3 and under can have more than 8 valence electrons
by Andrea Raymundo 1B
Wed Jun 13, 2018 2:18 am
Forum: Molarity, Solutions, Dilutions
Topic: test 1 Q.1 Help?
Replies: 1
Views: 165

test 1 Q.1 Help?

lithium carbonate, , is a salt which is used for the treatment of bipolar disorder. A solution of lithium carbonate is prepared by dissolving 2.00 g of salt to 1.00 L water.
A. what is the concentration of lithium ions for the above solution?
by Andrea Raymundo 1B
Wed Jun 13, 2018 1:52 am
Forum: Molarity, Solutions, Dilutions
Topic: test 1 Q. 2
Replies: 1
Views: 136

test 1 Q. 2

kinda a old question but i was still confused on how to solve this question and also are there any other similar question like these in the book ? One industrial application of anelectrolyte solution is electroplating of metals. In this process, an aqueous solution of metal ions is prepared and elec...
by Andrea Raymundo 1B
Wed Jun 13, 2018 1:14 am
Forum: Determining Molecular Shape (VSEPR)
Topic: sigma and pi bond
Replies: 2
Views: 149

Re: sigma and pi bond

not sure if you were confused on this too but when given a lewis structure, a single bond is a sigma bond while double and triple bonds are pi bonds :)
by Andrea Raymundo 1B
Wed Jun 13, 2018 1:11 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Helpful Chart
Replies: 18
Views: 525

Re: Helpful Chart

when one of those regions is lone pair or pairs, is it basically the same thing but just with > or < ?
by Andrea Raymundo 1B
Wed Jun 13, 2018 1:10 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Helpful Chart
Replies: 18
Views: 525

Re: Helpful Chart

when one of those regions is lone pair or pairs, is it basically the same thing but just with > or < ?
by Andrea Raymundo 1B
Wed Jun 13, 2018 1:03 am
Forum: Bond Lengths & Energies
Topic: Bond Angles
Replies: 3
Views: 237

Re: Bond Angles

i was told that when there is one lone pair, the angles between the lone pair and the atom would be >109.5 and the angles between two atoms would be <109.5 .
by Andrea Raymundo 1B
Wed Jun 13, 2018 12:58 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Homework 4.13
Replies: 2
Views: 162

Re: Homework 4.13

the only way that it would be bent if the central atom had two lone pairs. with three long pairs you can kinda picture it like a trigonal bipyramidal, the three lone pairs are 120 degrees from one another leaving the two other atoms being directly across from each other (180 degrees)
by Andrea Raymundo 1B
Wed Jun 13, 2018 12:53 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Van Der Waal forces
Replies: 3
Views: 568

Van Der Waal forces

could anyone explain to me what the differences are between diople-dipole forces, london forces, ion-dipole, and hydrogen bonding?! How could we identify them when given molecular substances? Like in question 6.1
by Andrea Raymundo 1B
Tue Jun 12, 2018 7:40 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: series
Replies: 1
Views: 134

series

for the final are we expected to just knowthe balmer and lyman series or also the paschen, brackett, and pfund series??
by Andrea Raymundo 1B
Tue Jun 12, 2018 6:09 pm
Forum: Balancing Chemical Reactions
Topic: oxidation and reduction
Replies: 1
Views: 125

oxidation and reduction

Im not sure if i remember there being a mention of oxidation and reduction, would it be something mentioned on the final
by Andrea Raymundo 1B
Sat Jun 09, 2018 8:22 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: electron configuration of Palladium
Replies: 2
Views: 228

electron configuration of Palladium

i would usually expect it to be [Kr] 5s^{2}4d^{8} but I looked this up online and it said that it is [Kr] 4d^{10} beacause it is most stable. I remember professor Lavelle mentioning something similiar but when it would be d^{4} or d^{^{9}} but is d^{8} another exception or is the exception just pall...
by Andrea Raymundo 1B
Wed Jun 06, 2018 2:15 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: question 17.35 and 17.36
Replies: 1
Views: 83

question 17.35 and 17.36

17.35 asks to determine if the isomers of diaminobenzene can form chelating complexes and similarly 17.36 asks to ligands do you expect to form chelating complexes, how is one supposed to determine that from just looking at the pictures ??
by Andrea Raymundo 1B
Wed Jun 06, 2018 2:11 am
Forum: Hybridization
Topic: Hybridization
Replies: 3
Views: 121

Hybridization

I am not sure if i heard right but when figuring out how many hybridization orbitals one has to use, is it the same as the number of regions of electron desnities??
by Andrea Raymundo 1B
Wed Jun 06, 2018 2:05 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Ax?e?
Replies: 1
Views: 110

Re: Ax?e?

A represents the central atoms, X represents the numebr of atoms bonded to the central atom, and E is the number of long pairs. For example, CF_{4} has a VSEPR formula of AX_{4} , there is the 4 as subscript on the X becuase there are 4 Fs bonded to C. Another example (with lone pairs) could be XeF_...
by Andrea Raymundo 1B
Thu May 31, 2018 5:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: HW Question 4.25
Replies: 1
Views: 60

HW Question 4.25

part A asks to find whether is polar or nonpolar, do we find out based on the Lewis Structure or the actually shape of the molecule.
by Andrea Raymundo 1B
Tue May 08, 2018 2:17 am
Forum: Trends in The Periodic Table
Topic: Difference between Periodic trends [ENDORSED]
Replies: 4
Views: 269

Re: Difference between Periodic trends [ENDORSED]

Electron affinity is a measure of energy change when an electron is added while electronegativity is how attracted an atom is to electrons. While electron affinity is increasing, electronegativity is decreasing since as an atom is less attractive to electrons, it requires more energy to add an elec...
by Andrea Raymundo 1B
Tue May 08, 2018 2:06 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Test 2 Q.4
Replies: 3
Views: 241

Test 2 Q.4

Q: A cotton ball soaked in CaCl_{2} is lit on fire. The flame is a dark orange color (\lambda =630.nm) . A scientist claims that the color arises from the transition of an electron from its excited state to its ground state. What is the difference in energy between these two states? Help?? I...
by Andrea Raymundo 1B
Mon May 07, 2018 7:15 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Unicorn Practice Midterm #8
Replies: 3
Views: 304

Unicorn Practice Midterm #8

A bullet of mass 2.8 g travels at 373.23 ± .34 m/s. What is the indeterminacy of position?

could anyone help on where to start on this
by Andrea Raymundo 1B
Tue Apr 24, 2018 1:18 am
Forum: Properties of Electrons
Topic: Homework 1.15
Replies: 1
Views: 180

Homework 1.15

15. In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line.

How would one know like where to start and which equation to use??
by Andrea Raymundo 1B
Mon Apr 16, 2018 11:09 am
Forum: Properties of Light
Topic: wavelength [ENDORSED]
Replies: 3
Views: 115

wavelength [ENDORSED]

when asked to find the wavelength of a a light we one divide c by the frequency given right?

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