Search found 61 matches

by Jimmy lira-1G
Sun Jun 10, 2018 10:06 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Oxides
Replies: 4
Views: 196

Re: Amphoteric Oxides

I'm not sure if we have to memorize this for the test but here is a vid that would help you out

https://www.youtube.com/watch?v=G01ybx24hJg

-Jimmy Lira 1G
by Jimmy lira-1G
Sun Jun 10, 2018 10:04 pm
Forum: Naming
Topic: Naming
Replies: 5
Views: 235

Re: Naming

I believe it is 72 and 90 degrees

check out this link!

https://chemistryonline.guru/hybridization-sp3d3/

-Jimmy Lira 1g
by Jimmy lira-1G
Sun Jun 10, 2018 10:01 pm
Forum: Polyprotic Acids & Bases
Topic: ligand bonds
Replies: 2
Views: 123

Re: ligand bonds

Writing it in this order shows which element is going to be bonded by the metal; your question is somewhat unclear but I hope this answers your question!

-Jimmy Lira 1G
by Jimmy lira-1G
Sat Jun 09, 2018 11:06 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand shape
Replies: 2
Views: 58

Ligand shape

If a molecule forms a ring structure with a ligand and metal does that always mean this ring shape is a polydentate ligand??

-Jimmy Lira 1G
by Jimmy lira-1G
Sat Jun 09, 2018 10:50 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand bind to metal
Replies: 2
Views: 58

Ligand bind to metal

Can a ligand bind to a metal if it has a double bond? In section we discussed how it is harder for double bonds to stretch and rotate to bind to a specific metal, does that mean all double bonds don't bind to metals?


-Jimmy Lira 1 G
by Jimmy lira-1G
Sat Jun 09, 2018 10:39 am
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Difference
Replies: 1
Views: 133

Difference

What is the difference between pKA and KA for in terms of acidity?

-Jimmy Lira 1G
by Jimmy lira-1G
Sun Jun 03, 2018 7:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 7
Views: 148

Re: Lone pairs

To answer your question: "Lone pairs have the greatest repelling effect because they are closer to the nucleus of the central atom compared to the bonding pairs, therefore they repel other lone pairs greater compared to bonding pairs. Bonding pairs have a bond between the nucleus of the central...
by Jimmy lira-1G
Sun Jun 03, 2018 7:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 5
Views: 103

Re: Lone pairs

To see more details about lone pairs and how they affect bond angles check out this file!





-Jimmy Lira 1G
by Jimmy lira-1G
Sun Jun 03, 2018 7:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Ch 4 clarification
Replies: 2
Views: 75

Re: Ch 4 clarification

So when describing the structure in terms of hybrid orbitals it is referring to hybridization where you would 1. Look at the atom. 2. Count the number of atoms connected to it (not bonds – atoms). 3. Count the number of lone pairs attached to it. 4. Add these two numbers together. 5. put this number...
by Jimmy lira-1G
Sun Jun 03, 2018 7:03 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bonds
Replies: 2
Views: 159

Bonds

How are anti-bonding orbitals and bonding orbitals created/formed?


-Jimmy Lira 1G
by Jimmy lira-1G
Thu May 31, 2018 5:56 pm
Forum: Hybridization
Topic: Hybridization exceptions
Replies: 1
Views: 60

Hybridization exceptions

I was just wondering if there are any exceptions to hybridization of molecules? Also, will we see anything bigger than an octahedral (sp3d2) on the test?


-Jimmy Lira 1G
by Jimmy lira-1G
Wed May 30, 2018 1:30 pm
Forum: Hybridization
Topic: Hybrid
Replies: 1
Views: 37

Hybrid

Are the # of regions of e- density always the same as the # of hybrid orbitals?

-Jimmy Lira 1G
by Jimmy lira-1G
Sun May 27, 2018 10:19 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Ionisation [ENDORSED]
Replies: 2
Views: 209

Re: Ionisation [ENDORSED]

So I looked up your question and did some research and found link that is really helpful check it out !!

https://courses.lumenlearning.com/chemi ... constants/


-Jimmy Lira 1g
by Jimmy lira-1G
Sun May 27, 2018 10:13 pm
Forum: Resonance Structures
Topic: Resonance [ENDORSED]
Replies: 5
Views: 235

Re: Resonance [ENDORSED]

I believe that this means which has more resonance structures . So whichever has more structures that contribute to resonance has the most resonance .

-Jimmy Lira 1G
by Jimmy lira-1G
Sun May 27, 2018 10:06 pm
Forum: Octet Exceptions
Topic: Expanded Octet
Replies: 2
Views: 214

Re: Expanded Octet

As stated above , yes it is because of the d orbital as the d contains 10 , so these elements can have an expanded octet as they can have the d orbital
-Jimmy Lira 1g
by Jimmy lira-1G
Sun May 27, 2018 10:00 pm
Forum: Dipole Moments
Topic: Dipole
Replies: 4
Views: 128

Dipole

Which effects dipole more radius size or ionization ? Or do these factors not effect dipole ? Only electronegativity effects dipole ?


-Jimmy Lira 1g
by Jimmy lira-1G
Sat May 26, 2018 2:48 pm
Forum: Ionic & Covalent Bonds
Topic: Group 17
Replies: 2
Views: 72

Group 17

For group 17 elements, I understand that they can only form one bond with other elements since they already have 7 electrons; however, is there any exceptions that would allow group 17 elements to obtain a double bond or triple bond? Just curious

-Jimmy Lira 1g
by Jimmy lira-1G
Mon May 21, 2018 7:47 pm
Forum: Bond Lengths & Energies
Topic: Bond Order
Replies: 4
Views: 174

Bond Order

What equation do we use to find bond order, as it relates to bond length?

Like I know the higher the bond order the shorter the bond length

-Jimmy Lira 1G
by Jimmy lira-1G
Sun May 20, 2018 10:28 pm
Forum: Resonance Structures
Topic: Double bonds
Replies: 3
Views: 135

Re: Double bonds

Your question is kind of confusing, but I'm going to attempt to help you out! So double bonds are used simply when they are needed to fill the octet rule and shelves of certain combinations of elements. Whether the molecules are large or small, double bonds are used to fulfill the octet rule and mak...
by Jimmy lira-1G
Sun May 20, 2018 10:14 pm
Forum: Electronegativity
Topic: Electronegativiry vs electron affinity [ENDORSED]
Replies: 4
Views: 193

Re: Electronegativiry vs electron affinity [ENDORSED]

I found a couple of sources which could answer your question, check these links out! https://socratic.org/questions/what-is-the-difference-between-electronegativity-and-electron-affinity "1. Electronegativity is a numerical value associated with an atoms ability to form a covalent bond 2. Elect...
by Jimmy lira-1G
Sun May 20, 2018 10:11 pm
Forum: Properties of Electrons
Topic: Midterm #2 question 4a,b
Replies: 5
Views: 211

Midterm #2 question 4a,b

For question 4 on Midterm 2 it asks to find the wavelength of the ejected electron, which I knew how to do; however 4b asks "can the wavelike properties of ejected electrons in part A be detected?" and this question threw me off can someone explain the conceptual answer to this question; d...
by Jimmy lira-1G
Sun May 20, 2018 7:33 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Order of Increasing Polarization
Replies: 2
Views: 147

Re: Order of Increasing Polarization

More shells means that these electrons are easier to be taken away , thus more polarizability.
Also , polarizing power is the power to take electrons , while polarization is the ability to let go of your electrons .

-Jimmy Lira 1g
by Jimmy lira-1G
Thu May 17, 2018 5:54 pm
Forum: Electronegativity
Topic: Connection
Replies: 3
Views: 156

Connection

How are polarizability and electronegativity connected? Which effects which?


-Jimmy Lira 1G
by Jimmy lira-1G
Wed May 16, 2018 3:01 pm
Forum: Bond Lengths & Energies
Topic: exceptions
Replies: 1
Views: 101

exceptions

Are there any exceptions to the bond length and energy rules that we went over in class today ?


-Jimmy Lira 1g
by Jimmy lira-1G
Sun May 13, 2018 7:32 pm
Forum: Lewis Structures
Topic: Cations and Anions
Replies: 3
Views: 90

Re: Cations and Anions

Yes, it is possible the lewis structure would be placed in brackets with the correct cation or anion. This should help: http://butane.chem.uiuc.edu/pshapley/GenChem2/A1/2.html "By convention, the cation goes before the anion in a formula. Write out the Lewis structure of each atom or ion separa...
by Jimmy lira-1G
Sun May 13, 2018 7:20 pm
Forum: Electronegativity
Topic: Helium
Replies: 2
Views: 152

Re: Helium

I just answered this previously check this out abetterchemtext.com/Periodicity/exceptions.htm "This is the easiest of the exceptions. We have said that electronegativity increases to the right. This is true except that the trend does NOT include the noble gases. That means that fluorine has the...
by Jimmy lira-1G
Sun May 13, 2018 7:19 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Fornal Charge Exceptions?
Replies: 1
Views: 71

Re: Fornal Charge Exceptions?

I think I may have found one check this link out http://www.chem.ucla.edu/~harding/tutorials/formalcharge.pdf "(The rare exception is a pure covalent bond between two identical atoms such as in molecular chlorine, Cl-Cl.) Because of this uneven sharing atoms have fractional, rather than integer...
by Jimmy lira-1G
Tue May 08, 2018 8:42 pm
Forum: Trends in The Periodic Table
Topic: Ionization
Replies: 1
Views: 125

Ionization

How do the ionization trends work for the periodic table ? For 1st ionization ? For 2nd ionization ?
For finding greatest or least of ionization

-Jimmy Lira 1G
by Jimmy lira-1G
Tue May 08, 2018 2:36 pm
Forum: Trends in The Periodic Table
Topic: Increasing Ionic radius
Replies: 2
Views: 136

Increasing Ionic radius

What do the anions have to do with the organization of the ionic radius
for example
order these :

s^2- , cl-, p^3-

Answer : p^3-, s^2-, cl-
How do I organize by increasing ionic radius with regard to the anions ?

-Jimmy Lira 1G
by Jimmy lira-1G
Mon May 07, 2018 6:17 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Ground state elec. config.
Replies: 3
Views: 127

Ground state elec. config.

Give the ground state electron configuration for the following:

Sn^ 4+

- I did this practice problem, but I got
[Kr]5s^2 5p^2 4d^10
However i know we have to take away the 4+ , but how do I know which to take it from ? why can't I take it away from the d ?
the answer is [Kr]4d^10

Jimmy Lira 1-G
by Jimmy lira-1G
Sun May 06, 2018 10:24 pm
Forum: Ionic & Covalent Bonds
Topic: van der waals forces [ENDORSED]
Replies: 3
Views: 84

van der waals forces [ENDORSED]

Will we need to know about van der waals forces? If so can somone explain how these forces work and if they are stronger than ionic or covalent bonds? Where would these forces apply in chem ?


-Jimmy Lira 1 G
by Jimmy lira-1G
Sun May 06, 2018 10:18 pm
Forum: Properties of Light
Topic: Test 2 Question 4
Replies: 8
Views: 231

Re: Test 2 Question 4

To further explain , it is from n=x to n=2 You would use the wav= h/m*v put this into terms of v and solve using 700nm given for wavelength then when v is found find energy E=hv after this En=-hR/n^2 , put in terms of n and solve when you get n then use the En=-hR/n^2 equation again with that n foun...
by Jimmy lira-1G
Sun May 06, 2018 8:32 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3d before 4s
Replies: 9
Views: 190

Re: 3d before 4s

Your question is unclear, but I do believe your statement is true , and the only exceptions are Cr and Cu, as I remember him saying that in lecture ;hope this helps https://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Electronic_Structure_of_Atoms_and_Molecules/Electronic_Configuratio...
by Jimmy lira-1G
Sun May 06, 2018 8:22 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent vs. Ionic
Replies: 3
Views: 111

Re: Covalent vs. Ionic

They are significantly different. Cavelent bonds are bonds formed between 2 nonmetals , which share their electrons to become stable. It is chemical bonding Ionic bonds are bonds formed between a nonmetal and metal ; nonmetals are stronger than metals and can get electrons from the metal. It is an e...
by Jimmy lira-1G
Wed May 02, 2018 4:41 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.25 hw
Replies: 2
Views: 74

2.25 hw

For 2.29 it gives orbitals and the block of the orbital for example 4p orbital It asks how many electrons are available at this orbital? I got 6 electrons for 4p, but I'm not sure if I did this right can somone explain the correlation of orbitals and blocks to electron availability ? I used the peri...
by Jimmy lira-1G
Wed May 02, 2018 3:44 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: hw qs 2.19
Replies: 1
Views: 44

hw qs 2.19

I'm confused on where the 6d subshell (n=7) came from is it given ? Also, do I use ml= l,l-1,...-l to find how many ml values a 6d subshell has?
-Jimmy Lira1-G
by Jimmy lira-1G
Wed May 02, 2018 1:05 pm
Forum: Trends in The Periodic Table
Topic: Decrease across a period
Replies: 3
Views: 109

Decrease across a period

Why do the elements in the periodic table cause a decrease across a period of ionic radius? I understand they decrease, but why do the specific elements cause this ?

-Jimmy Lira 1G
by Jimmy lira-1G
Sun Apr 29, 2018 11:02 pm
Forum: *Shrodinger Equation
Topic: Energy equation
Replies: 1
Views: 132

Energy equation

for
energy of photon -threshold = kinetic energy
if we have to solve for kinetic do we use
e= 1/2 mv^2 or do we just use energies that are gven in the problem ??


-Jimmy Lira- 1g
by Jimmy lira-1G
Sun Apr 29, 2018 11:00 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: test
Replies: 3
Views: 119

test

for the test we took there was a problem that gave us the type of light and said to find resting and excited states of n and calculate n , how would this be solved without knowing the value of n??

-Jimmy Lira -1g
by Jimmy lira-1G
Sun Apr 29, 2018 10:58 pm
Forum: DeBroglie Equation
Topic: work threshold
Replies: 1
Views: 92

work threshold

for threshold or work when solving for it can we use
wavlength= hc/ work ??
I have seen many people do this but still confused

-Jimmy Lira 1-g
by Jimmy lira-1G
Sun Apr 29, 2018 10:57 pm
Forum: Properties of Electrons
Topic: ejecting electrons
Replies: 4
Views: 137

Re: ejecting electrons

wavelenght does but amplitude doesn't, so shortning the wavlenght will help ejection but amplitude will have no effect

-Jimmy Lira 1-g
by Jimmy lira-1G
Sun Apr 29, 2018 10:51 pm
Forum: Trends in The Periodic Table
Topic: S and d orbitals [ENDORSED]
Replies: 2
Views: 61

Re: S and d orbitals [ENDORSED]

4s orbitals have lower energy than 3d , so 4s are filled first ; 4s electrons are lost first during ionization so the 4s orbitals must have a higher energy then 3d orbitals which is why 3d comes after 4s Here's a helpful link https://chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Electr...
by Jimmy lira-1G
Sun Apr 29, 2018 10:43 pm
Forum: Properties of Electrons
Topic: Question about n and energy levels
Replies: 3
Views: 164

Re: Question about n and energy levels

The n refers to the number of shelves ^ as stated above and can be applied to the lyman series n ≥ 2 to n = 1 (where n is the principal quantum number) and balmer series n ≥ 3 to n = 2
It can be applied to the rydberg equation

- Jimmy Lira 1-G
by Jimmy lira-1G
Sun Apr 22, 2018 10:45 pm
Forum: Properties of Electrons
Topic: properties of electrons
Replies: 1
Views: 120

Re: properties of electrons

Well Danny, A standing wave intereferes with itself, (constructively), so it doesn't show acceleration and no loss of energy Non standing waves are deconstructive, showing acceleration and loss of energy this should help: https://www.lucamoroni.it/simulations/standing-waves-in-bohrs-atomic-model/ It...
by Jimmy lira-1G
Sun Apr 22, 2018 10:32 pm
Forum: Einstein Equation
Topic: Graph using einstein equation
Replies: 2
Views: 108

Graph using einstein equation

I saw a question on review that asked: Draw a graph comparing the inverse wavelength of a photon versus the energy of photon (label axis) - I understand that the einstein equation us used and the equation to graph is E= hc/wavelength, however I was unclear how they graphed a line from this equation,...
by Jimmy lira-1G
Sun Apr 22, 2018 10:20 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty equation [ENDORSED]
Replies: 3
Views: 116

Uncertainty equation [ENDORSED]

The equation is
change P x change X >= h/4pi

I understand how to use the equation, but was uncertain on why the pi is used in this equation, can someone please clarify?

-Jimmy Lira 1G
by Jimmy lira-1G
Sun Apr 22, 2018 10:13 pm
Forum: DeBroglie Equation
Topic: question 1.41
Replies: 1
Views: 57

question 1.41

For hw question 1.41 , I used debrogile equation, however I was confused on the mass of a neutron, it isn't given , so is this common information we need to know ? If so I didn't know which mass of a neutron to use as the internet had different amounts for the neutron I found 1.6749 x 10-27 kg. do i...
by Jimmy lira-1G
Sun Apr 22, 2018 10:04 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Memorizing spectrum
Replies: 5
Views: 139

Re: Memorizing spectrum

Well Marina, you can memorize it and this will help https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=2ahUKEwiNsLC328_aAhVJ3GMKHZuPD3gQjRx6BAgAEAU&url=https%3A%2F%2Fcommons.wikimedia.org%2Fwiki%2FFile%3AEM_Spectrum_Properties_edit.svg&psig=AOvVaw0s...
by Jimmy lira-1G
Sun Apr 22, 2018 9:48 pm
Forum: DeBroglie Equation
Topic: How do you calculate speed using the De Broglie equation? [ENDORSED]
Replies: 6
Views: 129

Re: How do you calculate speed using the De Broglie equation? [ENDORSED]

Just to clarify,

wavelength= h / m
h= plancks constant 6.626 x 10^-34 j s
m= momentum= velocity x mass
so
m= h/ wavelength
velocity= h/ wavelength / mass
- Jimmy lira 1g
by Jimmy lira-1G
Sun Apr 15, 2018 10:03 pm
Forum: Properties of Light
Topic: Wave particle duality
Replies: 3
Views: 51

Wave particle duality

If there are waves in constructive or destructive interference is there a limit to the amount of waves that can be joined together? Can there be more than 2 waves joined for these interferences to occur, if so do the wavelengths create like a mean wavelength overall, not speaking about amplitude, bu...
by Jimmy lira-1G
Sun Apr 15, 2018 9:53 pm
Forum: Properties of Light
Topic: Series of light
Replies: 4
Views: 131

Series of light

I'm confused on what the difference is between the Lyman series and the Balmer series, I kind of understand it, but I just need clarification on the differences? Does the Balmer series in the ultraviolet region of the spectrum?
-Jimmy Lira 1-G
by Jimmy lira-1G
Sun Apr 15, 2018 9:47 pm
Forum: Properties of Light
Topic: Wavelength [ENDORSED]
Replies: 9
Views: 237

Wavelength [ENDORSED]

Does wavelength have to be from peak to peak, because I saw many example from the book where the wavelength wasn't exactly peak to peak but a certain place on the wave to another certain place?
-Jimmy Lira 1-G
by Jimmy lira-1G
Sun Apr 15, 2018 9:44 pm
Forum: Properties of Electrons
Topic: Geiger -Marsden experiment [ENDORSED]
Replies: 5
Views: 147

Geiger -Marsden experiment [ENDORSED]

What was the importance of the Geiger -Marsden experiment in terms of electrons, protons, neutrons?
-Jimmy Lira 1-G
by Jimmy lira-1G
Sun Apr 15, 2018 9:30 pm
Forum: Properties of Light
Topic: Equations in Quantum
Replies: 2
Views: 68

Equations in Quantum

What did professor Lavelle mean by equations in Quantum mechanics have variables that are quantized , or discrete ?
-Jimmy Lira 1-G
by Jimmy lira-1G
Sun Apr 15, 2018 9:24 pm
Forum: Properties of Light
Topic: Bright Lines and the Atomic Spectra
Replies: 2
Views: 60

Re: Bright Lines and the Atomic Spectra

Does this mean that other light is emitted but red is the brightest because when the excited hydrogen atoms give off em radiation, 656nm em radiation is the most prevalent? To answer your question, when the excited hydrogen atoms give off em radiation at 656nm em radiation the only color present is ...
by Jimmy lira-1G
Sun Apr 15, 2018 9:11 pm
Forum: Properties of Light
Topic: Difference between wave model and particle model? [ENDORSED]
Replies: 6
Views: 1037

Re: Difference between wave model and particle model? [ENDORSED]

Re: Difference between wave model and particle model?
There are many differences among the wave and particle model, I found a comparison chart that might help with your dilema.
-Jimmy Lira -1G
by Jimmy lira-1G
Sun Apr 15, 2018 9:04 pm
Forum: Properties of Light
Topic: Photoelectric Effect
Replies: 1
Views: 64

Re: Photoelectric Effect

Why was it important for scientists to undergo this experiment? What questions led to their conclusion and what real contribution did they expect to make with their initial hypothesis? To answer your question , the photoelectric experiment was very important as it is used now to determine electron e...
by Jimmy lira-1G
Sun Apr 15, 2018 8:57 pm
Forum: Properties of Light
Topic: The Electromagnetic spectrum
Replies: 5
Views: 83

Re: The Electromagnetic spectrum

Do we have to memorize the spectrum if not how do we calculate its energy in order? I'm not really sure we have to memorize the spectrum, but I feel it would be very helpful. To answer your question, to calculate the energy first use (c = λ × ν), then after finding the frequency use Plank's equation...
by Jimmy lira-1G
Sun Apr 08, 2018 10:59 pm
Forum: Empirical & Molecular Formulas
Topic: f11
Replies: 3
Views: 128

Re: f11

Hello danny ! Well this is quite simple actually, you probably missed the example showing how to do this process; if the mass percentage is 65.5% the the mass percentage into grams is simply 65.5g , it is exactly the percentage without the % symbol, hope thats helpful !!!
by Jimmy lira-1G
Sun Apr 08, 2018 10:47 pm
Forum: Balancing Chemical Reactions
Topic: Fractions in chemical equations [ENDORSED]
Replies: 5
Views: 172

Fractions in chemical equations [ENDORSED]

I don't understand why we can't leave fractions in front of a element in a chemical equation when balancing; why is it required to get rid of fractions, is there a scientific reason for this or just simply so that the ratios of the balanced chemical equation have whole #s? \

-Jimmy Lira- 1G
by Jimmy lira-1G
Sun Apr 08, 2018 10:45 am
Forum: Empirical & Molecular Formulas
Topic: Homework Problem F9
Replies: 2
Views: 116

Re: Homework Problem F9

Yes, it is asking to find the empirical formula from the mass percentages of Vanillin. They give you mass percentages of 63.15% C, 5.30% H, and 31.55% O. The mass percentage of each element X, m(X), in exactly 100g of the compound is equal to its mass percentage in grams; so 63.15% is 63.15g and so ...

Go to advanced search