Search found 62 matches

by danielruiz1G
Sun Jun 10, 2018 9:58 pm
Forum: Polyprotic Acids & Bases
Topic: ligand bonds
Replies: 2
Views: 123

ligand bonds

In discussion when written as an example when written as a ligand bond, our TA told us that water was written as OH2 because O is the atom that reacts with the metal but what does writing it this way have to do with the bond structure?
by danielruiz1G
Sun Jun 10, 2018 9:54 pm
Forum: Polyprotic Acids & Bases
Topic: Coordination number [ENDORSED]
Replies: 3
Views: 371

Coordination number [ENDORSED]

In section our TA talked about coordination number, what does this have to do with oxidation number or the central metal
by danielruiz1G
Fri Jun 08, 2018 3:37 pm
Forum: Sigma & Pi Bonds
Topic: exceptions
Replies: 2
Views: 138

exceptions

In the book, it says there a few exceptions where a double bond is sometimes two pi bonds instead of one sigma and one pi. Are we expected to know these instances and are there any other exceptions that we need to know?
by danielruiz1G
Thu Jun 07, 2018 5:54 pm
Forum: Lewis Acids & Bases
Topic: HW J9
Replies: 2
Views: 141

Re: HW J9

Since it has no bonds it would be easier to donate H+ protons making it a strong acid.
by danielruiz1G
Thu Jun 07, 2018 5:50 pm
Forum: Lewis Structures
Topic: Valence Electrons for d-Block Elements?
Replies: 2
Views: 97

Re: Valence Electrons for d-Block Elements?

for transition metals on the periodic table, they cant be assigned traditional valence electrons like the rest of the table according to the group, but in the d block it ranges from group 3 to 12 and all but group 3 that has 3 valence e-, can have a different number of valence e- depending on the si...
by danielruiz1G
Thu Jun 07, 2018 5:40 pm
Forum: Hybridization
Topic: Composition of a bond (Sigma and Pi Bonds)
Replies: 3
Views: 151

Re: Composition of a bond (Sigma and Pi Bonds)

I believe this is the period that this atom belongs to on the periodic table.
by danielruiz1G
Sun Jun 03, 2018 9:51 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: AXE formula
Replies: 18
Views: 527

AXE formula

is it possible to determine the shape of a molecule if you're only given the AXE formula, if so how do you do it?
by danielruiz1G
Sun Jun 03, 2018 9:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Radical
Replies: 4
Views: 87

Re: Radical

E represents lone electron pairs. so to my understanding, it has to be a pair, if not then it is not counted for.
by danielruiz1G
Sun Jun 03, 2018 9:40 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Atom Distance, repulsion?
Replies: 6
Views: 171

Re: Atom Distance, repulsion?

the negative charge of electrons repel other negatively charged electrons making them try to be as far apart from each other as possible
by danielruiz1G
Sun Jun 03, 2018 9:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR and Lewis
Replies: 2
Views: 44

Re: VSEPR and Lewis

In the correct Lewis structure for boron trifluoride, the bond angles are 120 degrees. because the have to be equally spaced because of the electron repulsion.
by danielruiz1G
Thu May 31, 2018 10:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: regions of e- density
Replies: 4
Views: 89

regions of e- density

do the number of regions of electron density always directly correspond to molecular shapes or are there exceptions?
by danielruiz1G
Tue May 29, 2018 10:57 am
Forum: Determining Molecular Shape (VSEPR)
Topic: single electron and shape
Replies: 3
Views: 42

single electron and shape

How does a single electron effect molecular shape? Does it effect shape the same as how a lone pair does?
by danielruiz1G
Sun May 27, 2018 8:29 pm
Forum: Ionic & Covalent Bonds
Topic: Difference between polar covalent and ionic bond?
Replies: 2
Views: 95

Re: Difference between polar covalent and ionic bond?

Also a covalent bond the electrons are shred between the atoms and in an ionic bond the more electronegative atom takes the electron to fulfill its octet and the other gives up it's electron and they bond because of the negative and positive charges cause them to attract.
by danielruiz1G
Sun May 27, 2018 8:26 pm
Forum: Ionic & Covalent Bonds
Topic: Partial charge or full charge
Replies: 4
Views: 128

Re: Partial charge or full charge

Also by finding the formal charge you can see charges and how the affect each other as well as how they cancel out in stable molecules
by danielruiz1G
Sun May 27, 2018 1:29 pm
Forum: Lewis Structures
Topic: Single electron
Replies: 5
Views: 69

Re: Single electron

Yes, like if it is how is it made stable?
by danielruiz1G
Sun May 27, 2018 1:25 pm
Forum: Hybridization
Topic: Hybridization
Replies: 2
Views: 51

Hybridization

I understand how to find hybridization for problems but I don't exactly understand what it has to do with. Can someone explain?
by danielruiz1G
Sun May 27, 2018 1:21 pm
Forum: Hybridization
Topic: basics of hybridization
Replies: 18
Views: 449

Re: basics of hybridization

If you want more practice with hybridization I think this explains it pretty well.
https://youtu.be/4xl0BD-tMeA
by danielruiz1G
Sun May 27, 2018 12:19 pm
Forum: Lewis Structures
Topic: Single electron
Replies: 5
Views: 69

Single electron

When there is a single electron left why isn't it just a cation to add another electron?Wouldn't it be more stable this way?
by danielruiz1G
Sun May 27, 2018 11:48 am
Forum: Lewis Structures
Topic: 2 lone pairs
Replies: 5
Views: 131

2 lone pairs

On a structure that has 2 lone pairs on the center atom, how are we supposed to know when the strcutes go on the top and bottom or both stay on the top side?
by danielruiz1G
Sun May 20, 2018 10:55 pm
Forum: Dipole Moments
Topic: lone pairs
Replies: 3
Views: 82

lone pairs

do lone pairs contribute and have dipole moments?
by danielruiz1G
Sun May 20, 2018 10:47 pm
Forum: Octet Exceptions
Topic: Octet Exception
Replies: 7
Views: 244

Re: Octet Exception

I think we just have to memorize the certain ones but what makes them exceptions are if certain molecules have an odd number of electrons, if one of the atoms in the molecules has more than eight electrons, or if one atom has less than eight electrons
by danielruiz1G
Sun May 20, 2018 10:42 pm
Forum: Ionic & Covalent Bonds
Topic: ionic and covalent character
Replies: 7
Views: 154

ionic and covalent character

when seeing if a bond is ionic or covalent with the few exceptions is there a way to figure this out or do we just have to know the exceptions
by danielruiz1G
Sun May 20, 2018 10:28 pm
Forum: Lewis Structures
Topic: central atom
Replies: 7
Views: 80

central atom

how exactly do you know which atom is the central atom when drawing Lewis structures?
by danielruiz1G
Sun May 20, 2018 10:18 pm
Forum: Ionic & Covalent Bonds
Topic: Properties of Hydrogen
Replies: 3
Views: 69

Re: Properties of Hydrogen

Hydrogen is actually a gas and forms binds with non metals
by danielruiz1G
Sun May 20, 2018 10:16 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Character?
Replies: 3
Views: 124

Re: Covalent Character?

Covalent character is shown by electronegativity or how much an atom attracts electron pairs to it.
by danielruiz1G
Sun May 13, 2018 10:26 pm
Forum: Lewis Structures
Topic: Valence Electrons [ENDORSED]
Replies: 2
Views: 46

Re: Valence Electrons [ENDORSED]

Valence electrons are the outmost electrons in an atom. these electrons are the electrons that are involved in reactions that form compounds and things like cations and anions.
by danielruiz1G
Sun May 13, 2018 10:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions [ENDORSED]
Replies: 3
Views: 117

Exceptions [ENDORSED]

So I know that there are exceptions for chromium and copper when doing electron configurations, but does anyone know exactly why this happens? My first thought is that it takes away an electron from another orbital, is this close to being correct?
by danielruiz1G
Sun May 13, 2018 10:20 pm
Forum: Lewis Structures
Topic: Benzine
Replies: 3
Views: 88

Re: Benzine

unless we're asked to draw out every possible structure of electrons in a compound then yes, but if not then I don't think so.
by danielruiz1G
Sun May 13, 2018 10:14 pm
Forum: Ionic & Covalent Bonds
Topic: octet explanation [ENDORSED]
Replies: 3
Views: 72

octet explanation [ENDORSED]

In the definition of the octet rule in the textbook what exactly is meant when it says atoms go "as far as possible" toward completing their octets?
by danielruiz1G
Sun May 13, 2018 10:03 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Bonds
Replies: 4
Views: 105

Re: Ionic Bonds

To answer the last part of your question, ionic bonds are formed by nonmetals and metal atoms while covalent is between two nonmetals.
by danielruiz1G
Tue May 08, 2018 3:54 pm
Forum: Trends in The Periodic Table
Topic: 2.67 part b
Replies: 2
Views: 108

Re: 2.67 part b

i meant to the right of the m=table in the question up above
by danielruiz1G
Tue May 08, 2018 3:45 pm
Forum: Trends in The Periodic Table
Topic: 2.67 part b
Replies: 2
Views: 108

2.67 part b

Why does Carbon have a higher electron affinity than Nitrogen when the periodic trend shows that electron affinity increases as you go up and to the left of the table?
by danielruiz1G
Sun May 06, 2018 10:30 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration-(Sn)
Replies: 5
Views: 190

Re: Electron Configuration-(Sn)

When writing this out just remember that it is written from the lower energy levels to highest so "p,s,d,f" and must be filled in that order.
by danielruiz1G
Sun May 06, 2018 10:26 pm
Forum: Ionic & Covalent Bonds
Topic: van der waals forces [ENDORSED]
Replies: 3
Views: 84

Re: van der waals forces [ENDORSED]

I know we learned about this is the 7 series but I don't think we need to know this since it's not too relevant to chemical bonds right now.
by danielruiz1G
Sun May 06, 2018 10:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.27 [ENDORSED]
Replies: 1
Views: 73

2.27 [ENDORSED]

In problem 2.27 you're asked to find the subshell notation and are given "n" and "l" and I get how to you use the "n" and the "l" but how come the "l" given doesn't correspond with the "n" given, like wouldn't you usually use the "n&qu...
by danielruiz1G
Sun May 06, 2018 10:05 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: How many significant figures? [ENDORSED]
Replies: 5
Views: 135

Re: How many significant figures? [ENDORSED]

Just remember to use the rules of sig figs when either multiplying/dividing or adding/subtracting. With multi./division you keep the same number of digits as the smallest number of sig figs in your problem and for addition/subtraction, you keep the sig fig until the digit of the least accuracy.
by danielruiz1G
Wed May 02, 2018 4:58 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2.25 [ENDORSED]
Replies: 3
Views: 125

2.25 [ENDORSED]

In 2.25 I get the correlation of maximum electrons and orbitals for the most part, except for in part c wherein the 1s block the answer is 2 e, when i thought hydrogen could only have 1 electron. how can this be?
by danielruiz1G
Wed May 02, 2018 1:05 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: d block electron configuration
Replies: 5
Views: 180

d block electron configuration

In electron configuration why do we start from 3 in period 4 when working in the d block?
by danielruiz1G
Sun Apr 29, 2018 10:45 pm
Forum: Properties of Electrons
Topic: ejecting electrons
Replies: 4
Views: 137

ejecting electrons

when ejecting electrons does amplitude of wavelength have anything to do with it?
by danielruiz1G
Sun Apr 29, 2018 10:33 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: test 2 #4
Replies: 4
Views: 141

test 2 #4

On test 2 on question we had to find the energy difference but were not given then levels like n=? so how would we go about doing this?
by danielruiz1G
Sun Apr 29, 2018 10:31 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: E=R(1/n-1/n)?
Replies: 7
Views: 243

E=R(1/n-1/n)?

I'm confused on how exactly Borh's equation is turned into E=R(1/n-1/n) when finding the difference in energy level?
by danielruiz1G
Sun Apr 29, 2018 10:28 pm
Forum: Photoelectric Effect
Topic: Calculating kinetic energy of an emitted electron [ENDORSED]
Replies: 3
Views: 141

Re: Calculating kinetic energy of an emitted electron [ENDORSED]

The mass of an electron is a constant that you use in the equation for kinetic energy the only other way that you have to worry about mass is when it's asking for the energy of a molecule or atom where you would them have to use the periodic table to find its mass.
by danielruiz1G
Sun Apr 29, 2018 10:25 pm
Forum: Einstein Equation
Topic: Difference Between Equations
Replies: 4
Views: 152

Re: Difference Between Equations

In the E=hv equation, you use Planck's constant and frequency to find the energy of a photon, while with the E=1/2mv^2, you use mass and velocity to find the kinetic energy.
by danielruiz1G
Sun Apr 29, 2018 10:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodes
Replies: 2
Views: 52

Re: Nodes

Radial nodes are nodes inside the orbital lobes and by looking at s -orbitals, you can see that they only have radial nodes and an angular node is fixed at certain angles.
by danielruiz1G
Sun Apr 22, 2018 10:39 pm
Forum: Einstein Equation
Topic: finding frequency from Einstein's equation [ENDORSED]
Replies: 3
Views: 150

finding frequency from Einstein's equation [ENDORSED]

How exactly in a problem would you find frequency when given momentum?
by danielruiz1G
Sun Apr 22, 2018 10:36 pm
Forum: Einstein Equation
Topic: de brogile equation
Replies: 4
Views: 186

de brogile equation

in the de Broglie equation why does it state that any moving "particle" , when the examples talk about cars. can any moving object talk have a wavelength?
by danielruiz1G
Sun Apr 22, 2018 10:32 pm
Forum: Properties of Electrons
Topic: properties of electrons
Replies: 1
Views: 120

properties of electrons

What exactly is meant by a circular standing wave around a nucleus and how is this relevant to the spectra?
by danielruiz1G
Sun Apr 22, 2018 10:03 pm
Forum: Significant Figures
Topic: Use of sigfigs
Replies: 8
Views: 280

Re: Use of sigfigs

Sig figs are used to make sure your answers are accurate and remember that it depends if you are multiplying/dividing or adding/ subtracting that you either use the least amount of sig figs when you add and subtract or use the least amount decimal places when mult. / dividing.
by danielruiz1G
Sat Apr 21, 2018 11:10 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Discrepancy in Rydberg equation [ENDORSED]
Replies: 1
Views: 68

Re: Discrepancy in Rydberg equation [ENDORSED]

It has no negative in front because it just doesn't make sense for a wavelength to be negative.
by danielruiz1G
Sat Apr 21, 2018 11:07 pm
Forum: Einstein Equation
Topic: Planck's Constant Value [ENDORSED]
Replies: 7
Views: 2709

Re: Planck's Constant Value [ENDORSED]

It depends on significant figures rules and if you're multiplying/dividing or adding/subtracting
by danielruiz1G
Sun Apr 15, 2018 10:55 pm
Forum: Properties of Light
Topic: plancks constant
Replies: 2
Views: 55

plancks constant

how exactly is Planck's constant of 6.63x10j*s^-34 relevant to the equation and what does it stand for?
by danielruiz1G
Sun Apr 15, 2018 10:50 pm
Forum: Molarity, Solutions, Dilutions
Topic: concentration
Replies: 2
Views: 75

concentration

how do we find the mass of a solute when given the concentration using the equation given to us in class.
by danielruiz1G
Sun Apr 15, 2018 10:42 pm
Forum: Significant Figures
Topic: diference in sig figs
Replies: 5
Views: 172

diference in sig figs

What is the difference when multiplying, dividing, adding, subtracting when accounting for significant figures?
by danielruiz1G
Sun Apr 15, 2018 10:36 pm
Forum: Empirical & Molecular Formulas
Topic: empirical vs molecular
Replies: 5
Views: 221

empirical vs molecular

why when solved are the outcomes so different like in the example Dr. Lavelle gave us with glucose, CH2O(empirical) and C6H12O6(molecular)?
by danielruiz1G
Sun Apr 15, 2018 10:14 pm
Forum: Properties of Light
Topic: Experiments in Chemistry
Replies: 2
Views: 66

Re: Experiments in Chemistry

most of these experiments are there as examples that are relevant to equations or many of the ideas in chemistry.
by danielruiz1G
Sun Apr 15, 2018 10:12 pm
Forum: Properties of Light
Topic: Wave particle duality
Replies: 3
Views: 51

Re: Wave particle duality

in wavelength duality, the wavelength itself is not changed by interference only the amplitude is.
by danielruiz1G
Sun Apr 15, 2018 10:09 pm
Forum: Properties of Light
Topic: Frequency 1/s or s^-1 [ENDORSED]
Replies: 3
Views: 51

Re: Frequency 1/s or s^-1 [ENDORSED]

So the notation s^-1 is just another way of saying 1/s and are interchangeable.
by danielruiz1G
Sun Apr 15, 2018 9:50 pm
Forum: Properties of Light
Topic: Wavelength [ENDORSED]
Replies: 9
Views: 237

Re: Wavelength [ENDORSED]

Hi Jimmy, no measuring a wavelength does not have to be peak to peak, but it is just an easier way to visualize each wave. a wave can measured from any spot to the same spot after a complete cycle has passed. hope this helps.
by danielruiz1G
Sun Apr 15, 2018 9:47 pm
Forum: Properties of Light
Topic: wave length
Replies: 5
Views: 93

wave length

I'm confused on how exactly amplitude plays a role in oscillations and wavelength. can some explain this to me?
by danielruiz1G
Sun Apr 08, 2018 10:57 pm
Forum: Empirical & Molecular Formulas
Topic: f11
Replies: 3
Views: 128

f11

For f11 in the homework, when converting the mass percentages into its mass percentage in grams, how exactly can I convert it?
by danielruiz1G
Sun Apr 08, 2018 10:54 pm
Forum: Balancing Chemical Reactions
Topic: Fractions in chemical equations [ENDORSED]
Replies: 5
Views: 172

Re: Fractions in chemical equations [ENDORSED]

you can't have fractions when balancing equations because it wouldn't make sense to have 3/4 of a carbon atom when you cant just split atoms in ordinary chemical equations. Hope this helps.
by danielruiz1G
Sun Apr 08, 2018 10:49 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Definition of moles [ENDORSED]
Replies: 5
Views: 180

Re: Definition of moles [ENDORSED]

A mol is a unit of measurement for an amount of a specific substance such as carbon or hydrogen, and they are different because they are completely different chemical substances and Avogadro's number (6.022 x 10^23 mol^-1) is just a constant when converting grams to atomic mass. I hope this helps.

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