Search found 64 matches

by Tiffanny_Carranza_2D
Sat Dec 12, 2020 7:54 pm
Forum: Balancing Chemical Reactions
Topic: stoichiometric
Replies: 1
Views: 37

stoichiometric

can someone clarify this question? I am not sure what it is asking
maybe i just don't know how to start it.

Without using a calculator, estimate what amount of Br 2 (in
moles) can be obtained from 0.30 mol ClO 2 in the reaction
6 ClO2(g) 1 2 BrF3(l) S 6 ClO2F(s) 1 Br2(l).
by Tiffanny_Carranza_2D
Sat Dec 12, 2020 2:39 pm
Forum: Conjugate Acids & Bases
Topic: sapling question 14
Replies: 7
Views: 77

sapling question 14

for sapling question 14

we get that the pka is 8.49

and the ph is 6.10

how are we supposed to know whether it is charged, neutral or unknown?

thankyou
by Tiffanny_Carranza_2D
Sat Dec 12, 2020 1:15 pm
Forum: Conjugate Acids & Bases
Topic: classifying acids and bases
Replies: 2
Views: 34

classifying acids and bases

I am having trouble classify acids and bases
for example sapling problem #7

Classify these salts as acidic, basic, or neutral

K2SO3, NH4Br, Na2S, KCl,LiBr
by Tiffanny_Carranza_2D
Sat Dec 12, 2020 12:32 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculation OH- sapling
Replies: 4
Views: 38

Calculation OH- sapling

Hello, what equation do we use to find OH-?

for example in
Determine the [OH−] , pH, and pOH of a solution with a [H+] of 7.9×10−7 M at 25 °C.
thank you.
by Tiffanny_Carranza_2D
Fri Dec 11, 2020 2:33 pm
Forum: Hybridization
Topic: hybridization
Replies: 10
Views: 88

hybridization

what is the hybridization of N in NH3?

I didn't understand How professor got SP3 can someone clarify the steps? thank you
by Tiffanny_Carranza_2D
Tue Dec 08, 2020 10:12 pm
Forum: Conjugate Acids & Bases
Topic: conjugate acids and bases
Replies: 6
Views: 49

conjugate acids and bases

How do I find a conjugate base and acid of a formula for example HSO4-

please help, thank you.
by Tiffanny_Carranza_2D
Tue Dec 08, 2020 10:03 pm
Forum: Amphoteric Compounds
Topic: How to determine amphoteric compounds
Replies: 5
Views: 17369

Re: How to determine amphoteric compounds

Could someone elaborate more on Kyle's process of easily identifying the amphoteric substance out of a list of substances that you are given? I still do not quite understand. Are there any patterns we should look out for? I read that you could figure it out by seeing which compound has hydrogen the...
by Tiffanny_Carranza_2D
Tue Dec 08, 2020 9:59 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: strong or weak acids and bases
Replies: 4
Views: 25

Re: strong or weak acids and bases

hello how does one decide whether a formula is a strong acid, weak acid, strong base, or weak base? for example how would i figure out what Ba(OH)2 is? thank you Strong Acid: Big size | Longer Bond Length | Weaker Bonds | Easily donates Proton -> Stronger Acid orrrrr if Resonance to stabilize acid ...
by Tiffanny_Carranza_2D
Tue Dec 08, 2020 9:32 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: strong or weak acids and bases
Replies: 4
Views: 25

strong or weak acids and bases

hello how does one decide whether a formula is a strong acid, weak acid, strong base, or weak base?
for example how would i figure out what Ba(OH)2 is?

thank you
by Tiffanny_Carranza_2D
Fri Dec 04, 2020 9:57 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ligands
Replies: 11
Views: 90

ligands

How are the NH3 ligands neutral ?
by Tiffanny_Carranza_2D
Fri Dec 04, 2020 9:48 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number for en
Replies: 2
Views: 27

Re: coordination number for en

If you draw the molecule en, you will notice that the two nitrogens on either side of the molecule each have a lone pair, and there are spacers in between the nitrogens, indicating that two bonds can be formed between this ligand and the metal atom. Therefore, en is bidentate, and it has a coordina...
by Tiffanny_Carranza_2D
Fri Dec 04, 2020 9:39 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number for en
Replies: 2
Views: 27

coordination number for en

is the coordination number for (en) 2?

if it is do you guys know why it isn't 1?
by Tiffanny_Carranza_2D
Fri Dec 04, 2020 9:05 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: coordination number
Replies: 2
Views: 15

coordination number

hello, how does one find a coordination number?
by Tiffanny_Carranza_2D
Fri Dec 04, 2020 8:51 pm
Forum: Naming
Topic: oxidation number
Replies: 3
Views: 35

oxidation number

hello I cannot figure out the oxidation number of this compound, i thought it was -6 or -8 because cl has 6 and then there is a 2- but both of those arr incorrect.

[PtCl6]2−
by Tiffanny_Carranza_2D
Fri Dec 04, 2020 8:23 pm
Forum: Naming
Topic: sapling problem #1
Replies: 5
Views: 61

sapling problem #1

I am having trouble knowing how to name compounds so far I got this:

[Co(NH3)4Cl2]Cl
tetra ammine chloro colbat (II) chloride

im not sure what is wrong about that
by Tiffanny_Carranza_2D
Sat Nov 28, 2020 8:13 pm
Forum: Lewis Acids & Bases
Topic: question 17 sapling
Replies: 7
Views: 54

Re: question 17 sapling

Ralph Zhang 2L wrote:There should be no resonance structures, the last one you are missing is the carbons forming a triangle shape with their bonds.

hi when do we know not to include a resonance structure? or should we just assume that for all questions?

thank you so much for your response btw
by Tiffanny_Carranza_2D
Sat Nov 28, 2020 8:04 pm
Forum: Lewis Acids & Bases
Topic: question 17 sapling
Replies: 7
Views: 54

question 17 sapling

i keep getting question 17 wrong on sapling it say to draw 3 structures of c3h4 I am not sure what I am doing wrong because I got one structure with two double bonds and 2 Hydrogens on ea. end the other two are the same but flipped with one triple bond 1 hydrogen on one end and 3 hydrogens on the ot...
by Tiffanny_Carranza_2D
Sat Nov 28, 2020 6:23 pm
Forum: Lewis Acids & Bases
Topic: angle size
Replies: 11
Views: 78

angle size

hello, I wanted to know how did you do sapling hw question 17

I am not sure how to recognize angle size yet, how did you guys figure it out or how did you get yourself to remember?

thank you
by Tiffanny_Carranza_2D
Tue Nov 24, 2020 11:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: sapling HW question three
Replies: 5
Views: 61

Re: sapling HW question three

magalysantos_1F wrote:I think what it's really asking is the smallest bond angle possible, and because this is a linear shape, it would be 180 degrees. These measurements were talked about in the lectures, so you don't have to necessarily do any calculations :)

thank you!
by Tiffanny_Carranza_2D
Tue Nov 24, 2020 9:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: sapling HW question three
Replies: 5
Views: 61

sapling HW question three

Question three is telling me to to say which what the smallest angle would be
X-Y-X ( Y has 2 lone pairs on top and one lone pair on the bottom?

How does one determine the angle?
thank you.
by Tiffanny_Carranza_2D
Mon Nov 23, 2020 1:33 pm
Forum: Hybridization
Topic: hybridize
Replies: 3
Views: 70

hybridize

in today's lecture I did not understand why parts of C2H4 had SP2 and others had SP3, I thought that they were all supposed to be SP2.
by Tiffanny_Carranza_2D
Mon Nov 23, 2020 1:32 pm
Forum: Hybridization
Topic: regions of electron density
Replies: 7
Views: 56

regions of electron density

how do you determine the amount of regions of electron density?

thank you
by Tiffanny_Carranza_2D
Tue Nov 17, 2020 12:06 am
Forum: Lewis Structures
Topic: lewis structure
Replies: 2
Views: 28

lewis structure

hello

on problem 2B9

the lewis structures are different for example b) k3P

is drawn out [k]+[k]+[k]+ [p]-3 ( p has 6 electron pairs)

why arent the answers shown with bonds, the atoms are separate like that but in question 2B11 the answers are given with bonds?

thank you.
by Tiffanny_Carranza_2D
Mon Nov 16, 2020 4:50 pm
Forum: Lewis Structures
Topic: electron configuration
Replies: 4
Views: 35

electron configuration

hello,
i am a little confused about problem 2 A 5 in the textbook hw

for a) Cu+ I got [Ar] 3d8 4s2

but I know the answer is [Ar] 3d10

i would like an explanation as to why 4s2 was dropped, if 4s is supposed to fill up first?
by Tiffanny_Carranza_2D
Mon Nov 16, 2020 2:37 pm
Forum: Trends in The Periodic Table
Topic: Textbook Exercise 1F.3
Replies: 3
Views: 46

Re: Textbook Exercise 1F.3

the answer key says that the answer is p3-,s2-, cl-

but the order i got was cl-,s2-, p3- because the question asked to put them in order of increasing radius, is the book mistaken or is my order wrong?

thank you
by Tiffanny_Carranza_2D
Sun Nov 15, 2020 10:32 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Determining Number of Orbitals
Replies: 3
Views: 43

Re: Determining Number of Orbitals

for n=4 l=2 ml= -2 you get 4D the D orbital would mean that ml= -2,-1,0,+1,+2 since there is (x,y,z) and ml=-2 then we would be within the first aspect of the D orbital, x. what would be an example of being in the second aspect of the D orbital y? and then would the number of orbitals be 2? thank you.
by Tiffanny_Carranza_2D
Sat Nov 14, 2020 5:49 pm
Forum: Resonance Structures
Topic: bond length
Replies: 37
Views: 192

bond length

are we supposed to know how to calculate bond length?

if so what equation or how do we do that?
thank you
by Tiffanny_Carranza_2D
Fri Nov 13, 2020 6:47 pm
Forum: Resonance Structures
Topic: formal charges
Replies: 2
Views: 21

Re: formal charges

Ashley Kim 3I wrote:Are you referring to electronegativity trends in general? Because if so, the electronegativity trend happens to be that across a period is more electronegative, and up a group is more electronegative.


yes thank you!
by Tiffanny_Carranza_2D
Fri Nov 13, 2020 6:43 pm
Forum: Resonance Structures
Topic: bond length
Replies: 6
Views: 25

bond length

hello

how do you check on a periodic table the length of the bond length?

thank you
by Tiffanny_Carranza_2D
Fri Nov 13, 2020 6:19 pm
Forum: Resonance Structures
Topic: plausible perchlorate ion
Replies: 3
Views: 50

plausible perchlorate ion

hi I am having trouble starting problem 9 on sapling

Which of the Lewis structures of the perchlorate ion are most plausible based on formal charge?

im not sure what its asking

thank you
by Tiffanny_Carranza_2D
Fri Nov 13, 2020 5:13 pm
Forum: Resonance Structures
Topic: lewis base or acid
Replies: 15
Views: 125

lewis base or acid

can anyone explain how do you know when a species is an acid or a base?

thank you
by Tiffanny_Carranza_2D
Fri Nov 13, 2020 3:09 pm
Forum: Resonance Structures
Topic: formal charges
Replies: 2
Views: 21

formal charges

how does one know which atom is the most electronegative?
by Tiffanny_Carranza_2D
Thu Nov 12, 2020 7:48 pm
Forum: Lewis Structures
Topic: formal charges
Replies: 2
Views: 33

formal charges

hello, i am currently doing a problem for CO3^2-

so far I got
.. ..
: O -----C------O:
.. || ..
O
..
I am not sure where to put the formal charge. I got -2.
by Tiffanny_Carranza_2D
Mon Nov 09, 2020 1:15 pm
Forum: Ionic & Covalent Bonds
Topic: delta + or -
Replies: 12
Views: 98

delta + or -

how do we know when something is delta + or -

at the end of lecture today, professor did H-o-H and he said O was delta -


how did he know?

thank you
by Tiffanny_Carranza_2D
Sun Nov 08, 2020 11:59 pm
Forum: Lewis Structures
Topic: interactions between ions
Replies: 1
Views: 39

interactions between ions

Na+(g) + Cl- (g) --> NaCl(s)
energy released = 787 kJmol-1

how is the energy released found?
by Tiffanny_Carranza_2D
Sun Nov 08, 2020 9:00 pm
Forum: Lewis Structures
Topic: lewis structure
Replies: 17
Views: 50

Re: lewis structure

The negative or positive sign outside the brackets represents the charge of the molecule. For example, if you are drawing the lewis structure of NO3-, you would put a - outside the bracket. If you are drawing SO42-, you would put 2- outside of the brackets. Hope this helps! thank you for your help....
by Tiffanny_Carranza_2D
Sun Nov 08, 2020 8:57 pm
Forum: Lewis Structures
Topic: lewis structure
Replies: 10
Views: 88

Re: lewis structure

Hi, so to assign formal charges for each atom in a molecule you, would use the formula: Formal Charge = Valence electrons - (shared electrons/2 + lone pairs). For instance, in NH4, each hydrogen has 1 valence electron, 2 shared electrons between it and nitrogen, and no lone pairs. You would plug th...
by Tiffanny_Carranza_2D
Fri Nov 06, 2020 11:13 pm
Forum: Lewis Structures
Topic: lewis structure
Replies: 17
Views: 50

lewis structure

something I was confused about in lecture was when professor put a negative sign outside of the brackets of a lewis structure

[Leis Structure]-

how do we know when to put a negative or a +?

thank you.
by Tiffanny_Carranza_2D
Fri Nov 06, 2020 10:48 pm
Forum: Dipole Moments
Topic: Water and NaCl Solubility
Replies: 4
Views: 19

Re: Water and NaCl Solubility

The water pulls apart Na and Cl which breaks the ionic bond
by Tiffanny_Carranza_2D
Fri Nov 06, 2020 8:51 pm
Forum: Lewis Structures
Topic: lewis structure
Replies: 10
Views: 88

lewis structure

hello, I am a little confused on how to assign "formal charges", for example in the sapling Hw problem #2 for NH4+

thank you
by Tiffanny_Carranza_2D
Fri Oct 30, 2020 3:06 pm
Forum: Lewis Structures
Topic: polyatomic species
Replies: 3
Views: 43

polyatomic species

today in lecture, professor this math :
O

O S O

O

SO4^2-

S=6e-

4x6e-= 24e-
2e-
----------
32 e-


I want to know where he got 6e- from and how did 32e- result from all of that?

thank you.
by Tiffanny_Carranza_2D
Tue Oct 27, 2020 4:32 pm
Forum: DeBroglie Equation
Topic: Sapling Homework - electron affinity
Replies: 9
Views: 132

Re: Sapling Homework - electron affinity

hello I am having a lot of trouble with this problem for the energy of an electron. I did: Ke=1/2(m)(v^2) for m i put in the mass of an electron: 9.109x10^-31 I got v from: v= (3.0x10^8 m/s)/(2.1x10^-6 m)= 1.42x10^14s Ke= 1/2(9.109x10^-31 kg )((1.42x10^14 s) ^2) the answer I got was Ke= 9.18x10^-3....
by Tiffanny_Carranza_2D
Tue Oct 27, 2020 3:56 pm
Forum: DeBroglie Equation
Topic: Sapling Homework - electron affinity
Replies: 9
Views: 132

Re: Sapling Homework - electron affinity

hello I am having a lot of trouble with this problem for the energy of an electron. I did: Ke=1/2(m)(v^2) for m i put in the mass of an electron: 9.109x10^-31 I got v from: v= (3.0x10^8 m/s)/(2.1x10^-6 m)= 1.42x10^14s Ke= 1/2(9.109x10^-31 kg )((1.42x10^14 s) ^2) the answer I got was Ke= 9.18x10^-3. ...
by Tiffanny_Carranza_2D
Mon Oct 26, 2020 11:54 pm
Forum: DeBroglie Equation
Topic: Sapling Week 2-4 HW Question 24
Replies: 11
Views: 131

Re: Sapling Week 2-4 HW Question 24

I believe that the first and second waves in the right column would work! Basically, if you repeated this same wave segment where the previous wave segment ended, it should create a continuous wave. Because the first and the second waves create a pattern in which the last iteration of the wave coul...
by Tiffanny_Carranza_2D
Mon Oct 26, 2020 8:48 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: sapling question 27
Replies: 3
Views: 44

sapling question 27

in this question they want us to find Δx and they give us two numbers " what is the uncertainty in the position of an electron moving at 8x10^6 m/s with an uncertainty of Δv= 0.01x10^6m/s?" how do I know which number to use? I used the second one but I would like to know why they gave us 8...
by Tiffanny_Carranza_2D
Mon Oct 26, 2020 5:13 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbitals
Replies: 5
Views: 72

orbitals

hi, I didn't understand why professor would put different elements when talking about a certain one, for example:

Cr:[Ar] 3d^5,4s

please help, thank you.
by Tiffanny_Carranza_2D
Mon Oct 26, 2020 3:27 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbitals
Replies: 1
Views: 21

orbitals

can anyone explain how professor got C: 1s^2, 2s^2, 2Px,2py

I didn't really understand this part of lecture.

thank you!
by Tiffanny_Carranza_2D
Fri Oct 23, 2020 9:32 pm
Forum: DeBroglie Equation
Topic: question 9 sapling
Replies: 4
Views: 88

question 9 sapling

For this problem I watched a video that told me to plug in the work function for e in λ= hc/e. But I am not sure why it is okay to plug in the workfunction for e. thank you.
by Tiffanny_Carranza_2D
Fri Oct 23, 2020 9:25 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: quantum numbers
Replies: 2
Views: 59

quantum numbers

I am unsure what to do when n=6 for example. in sapling question 13 how do you know how to solve for the electrons. i thought you couldn't have a number over 3. thank you
by Tiffanny_Carranza_2D
Thu Oct 22, 2020 10:10 pm
Forum: DeBroglie Equation
Topic: sapling [ENDORSED]
Replies: 3
Views: 89

Re: sapling [ENDORSED]

thank you!
by Tiffanny_Carranza_2D
Wed Oct 21, 2020 10:20 pm
Forum: DeBroglie Equation
Topic: sapling [ENDORSED]
Replies: 3
Views: 89

sapling [ENDORSED]

Professor's email said to turn of randomization on Sapling, does anyone know how to do that I can't figure it out. thank you !
by Tiffanny_Carranza_2D
Mon Oct 19, 2020 9:00 pm
Forum: Properties of Light
Topic: Sapling HW Week 2, 3, 4 Question #7
Replies: 10
Views: 120

Re: Sapling HW Week 2, 3, 4 Question #7

I am confused on this problem, I keep getting it wrong: i multiplied the 445g of ice by the enthalpy of fusion which was 333.6j/g and I got 1.48x10^5j then I used E=hc/wavelength, THE WAVELENGTH FOR ME WAS 843nm so i converted to meters and got 8.43x10^-16 E= ((6.626x10^-34j.s)(3.0x10^8m.s))/(8.43x1...
by Tiffanny_Carranza_2D
Mon Oct 19, 2020 7:23 pm
Forum: SI Units, Unit Conversions
Topic: unit convertion
Replies: 4
Views: 43

unit convertion

when converting a unit fir example 5.11x10^-4CM to meters do we just mulitply by 10^-2? i got the correct answer doing this but I would just like some reasurance that it is the right way to do it?
by Tiffanny_Carranza_2D
Fri Oct 16, 2020 1:48 pm
Forum: Properties of Light
Topic: rydberg equation
Replies: 7
Views: 61

rydberg equation

will we be required to know how to use the rydberg equation? or is it okay to do the problem the way that professor did it today in class?
by Tiffanny_Carranza_2D
Fri Oct 16, 2020 1:06 pm
Forum: Properties of Light
Topic: first worked example
Replies: 3
Views: 43

first worked example

Does anyone know where professor got -1/16 and -1/4 when doing the first worked example? he did -1/16HR-(-1/4HR)
by Tiffanny_Carranza_2D
Wed Oct 14, 2020 10:55 am
Forum: Properties of Light
Topic: work function
Replies: 15
Views: 169

work function

for work function problems how do we do the math? do we just use a calculator for problems like this? (6.626x10^-34)(3x10^8)/3.61x10^-19
by Tiffanny_Carranza_2D
Mon Oct 12, 2020 1:20 pm
Forum: Quantum Numbers and The H-Atom
Topic: high intensity light
Replies: 3
Views: 60

high intensity light

if increasing the wave amplitude of light didn't eject electrons, then what does? why did they switch from one light to the UV light? was the UV light an increase in the amplitude of light or what caused the metal to release electrons if it wasn't because of the wave amplitude?
by Tiffanny_Carranza_2D
Mon Oct 12, 2020 12:09 pm
Forum: Quantum Numbers and The H-Atom
Topic: atomic spectra
Replies: 7
Views: 72

atomic spectra

hi, can anyone please explain atomic spectra from today's lecture? I didn't understand thank you.
by Tiffanny_Carranza_2D
Sun Oct 11, 2020 5:19 pm
Forum: Administrative Questions and Class Announcements
Topic: Homework
Replies: 6
Views: 52

Re: Homework

Tiffanny_Carranza_2D

Does anyone know if this applies for the textbook homework as well? I'm not sure if we are supposed to turn it in somewhere.
by Tiffanny_Carranza_2D
Sun Oct 11, 2020 5:17 pm
Forum: Student Social/Study Group
Topic: On Campus Study Group
Replies: 2
Views: 41

Re: On Campus Study Group

Tiffanny_Carranza_2D

thank you so much for this! I will definitely try to participate in this. It is very important to stay connected especially with a challenging subject like 14A.
by Tiffanny_Carranza_2D
Sun Oct 11, 2020 3:15 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E-textbook [ENDORSED]
Replies: 107
Views: 7315

Re: Accessing the E-textbook [ENDORSED]

Tiffanny_Carranza_2D

Does anyone know where to find a physical copy of the textbook? I bought the e-book but I would really like a physical copy.
thank you (:
by Tiffanny_Carranza_2D
Sun Oct 11, 2020 3:07 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Calculating Molar Mass (Sapling Week 1 #10)
Replies: 6
Views: 78

Re: Calculating Molar Mass (Sapling Week 1 #10)

Tiffanny_carranza_2D

I just want to say thank you to all of you under this post, it has been very helpful in completing the homework
by Tiffanny_Carranza_2D
Wed Oct 07, 2020 9:37 am
Forum: Molarity, Solutions, Dilutions
Topic: theoretical and actual yeild
Replies: 4
Views: 56

theoretical and actual yeild

Tiffanny_Carranza_2D In todays lecture professor was going over the problem " what is the limiting reactant when 100g, H20, reacts with 100g CaC2?" After calculating the reactant moles and got CaC2= 1.56mol and H20=5.55mol, he said that CaC2 was the limiting reactant because it wasn't at a...
by Tiffanny_Carranza_2D
Tue Oct 06, 2020 9:20 pm
Forum: SI Units, Unit Conversions
Topic: Textbook
Replies: 22
Views: 182

Textbook

HI, Does anyone where to access the textbook homework? I haven't received my textbook from the uclastore yet.

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