Search found 66 matches
- Fri Dec 06, 2019 2:21 am
- Forum: Properties of Light
- Topic: Light Absorbed/ emitted
- Replies: 4
- Views: 224
Re: Light Absorbed/ emitted
If there is a jump in energy levels then the light is absorbed. if there is a drop in energy levels then the light is emitted.
- Fri Dec 06, 2019 2:02 am
- Forum: Amphoteric Compounds
- Topic: Amphiprotic vs Amphoteric
- Replies: 5
- Views: 245
Re: Amphiprotic vs Amphoteric
Amphiprotic is losing and gaining an electron, while amphoteric is being able to act as an acid and base.
- Fri Dec 06, 2019 2:00 am
- Forum: Octet Exceptions
- Topic: Incomplete octets
- Replies: 1
- Views: 126
Re: Incomplete octets
Incomplete octets can be formed because there are certain atoms of certain elements that can exist in stable compounds, thus forming bonds with less than 8 valence electrons.
- Fri Dec 06, 2019 12:16 am
- Forum: Significant Figures
- Topic: Sig Figs on Tests
- Replies: 24
- Views: 1207
Re: Sig Figs on Tests
The answer should have the same number of sig figs as the number (of sig figs) in the question.
- Fri Dec 06, 2019 12:12 am
- Forum: Hybridization
- Topic: Determining Hybridization
- Replies: 4
- Views: 65
Re: Determining Hybridization
By determining the regions of electron density and then make orbitals with this number in mind.
- Sun Dec 01, 2019 8:13 pm
- Forum: Lewis Acids & Bases
- Topic: Proton acceptor and proton donor?
- Replies: 33
- Views: 508
Re: Proton acceptor and proton donor?
An acid donates a proton, while a base accepts a proton.
- Sun Dec 01, 2019 8:12 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma Bond
- Replies: 10
- Views: 198
Re: Sigma Bond
Single bonds are sigma bonds but they can also exist in double and triple bonds.
- Sun Dec 01, 2019 8:11 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Inorganic and organic
- Replies: 3
- Views: 58
Re: Inorganic and organic
Organic ones contain carbon, while inorganic ones do not contain carbon.
- Sun Dec 01, 2019 8:09 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Final: Strong/ Weak Acids/Bases
- Replies: 11
- Views: 1001
Re: Final: Strong/ Weak Acids/Bases
I think its best if we know them. Just to be safe!
- Sun Dec 01, 2019 8:08 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Inorganic or Organic
- Replies: 6
- Views: 126
Re: Inorganic or Organic
Inorganic acids don to have carbon and organic acids do contain carbon.
- Sun Dec 01, 2019 8:06 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 4
- Views: 94
Re: Coordination Number
Yes I think that the coordination number is the number of bonds on the central atom.
- Sun Nov 24, 2019 5:13 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 16
- Views: 403
Re: Electronegativity
The higher the electronegativity the stronger the bond. When the bond is stronger is shorter.
- Sun Nov 24, 2019 4:58 pm
- Forum: Student Social/Study Group
- Topic: Test 2 and Final
- Replies: 18
- Views: 339
Re: Test 2 and Final
The final is cumulative and regarding test 2, I believe we'll be getting that back during discussion.
- Sun Nov 24, 2019 4:50 pm
- Forum: Hybridization
- Topic: Sigma and Pi bonds
- Replies: 13
- Views: 225
Re: Sigma and Pi bonds
I hope this is helpful! The two outer ones are pi bonds and the center one is a sigma bond.
- Sun Nov 24, 2019 4:44 pm
- Forum: Resonance Structures
- Topic: Resonance structures
- Replies: 15
- Views: 391
Re: Resonance structures
They are the various ways that a lewis structure can be drawn.
Re: Prefixes
They are used to determine the number of times a single ligand attaches to the central metal.
- Sun Nov 24, 2019 4:35 pm
- Forum: Hybridization
- Topic: Hybrid orbitals
- Replies: 5
- Views: 97
Re: Hybrid orbitals
You can find hybrid orbitals by looking at the lewis structure.
- Sun Nov 17, 2019 7:45 pm
- Forum: Student Social/Study Group
- Topic: What will Test 2 be on?
- Replies: 8
- Views: 213
Re: What will Test 2 be on?
I would look at outlines 3 and 4!
- Sun Nov 17, 2019 7:44 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 2
- Replies: 19
- Views: 371
Re: Test 2
Drawing the lewis structure can be really helpful if you're not completely sure and want to be safe!
- Sun Nov 17, 2019 7:43 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: dipole moments
- Replies: 7
- Views: 89
Re: dipole moments
Yes, the difference in electronegativity can cause a dipole moment.
- Sun Nov 17, 2019 7:38 pm
- Forum: Student Social/Study Group
- Topic: Test 2 Topics
- Replies: 3
- Views: 103
Re: Test 2 Topics
All material that was not on the midterm and up until this point.
- Sun Nov 17, 2019 7:33 pm
- Forum: Ionic & Covalent Bonds
- Topic: Dipole-Dipole Interactions
- Replies: 3
- Views: 61
Re: Dipole-Dipole Interactions
Here is an example of a dipole-dipole moment.
- Sun Nov 17, 2019 7:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angles for all VSEPR shapes?
- Replies: 2
- Views: 58
Re: Bond angles for all VSEPR shapes?
Yes, we need to know them.
- Sun Nov 10, 2019 8:12 pm
- Forum: General Science Questions
- Topic: London
- Replies: 4
- Views: 105
Re: London
London refers to London forces. It's an intermolecular force and the weakest.
- Sun Nov 10, 2019 8:08 pm
- Forum: Dipole Moments
- Topic: arrows for dipole moments
- Replies: 3
- Views: 48
Re: arrows for dipole moments
This is an example of a dipole moment. The arrow is pointing towards the atom with a partial negative charge.
- Sun Nov 10, 2019 8:00 pm
- Forum: Electronegativity
- Topic: Ionization energy and electronegativity
- Replies: 8
- Views: 125
Re: Ionization energy and electronegativity
Yes. The trends for ionization energy, electron affinity and electronegativity are the same.
- Sun Nov 10, 2019 7:57 pm
- Forum: Bond Lengths & Energies
- Topic: bond lengths
- Replies: 3
- Views: 50
Re: bond lengths
The length of a bond is determined by the number of bonded electrons. The higher the bond order then the stronger the pull between the two atoms and the shorter the bond length.
- Sun Nov 10, 2019 7:52 pm
- Forum: Dipole Moments
- Topic: Temporary Dipole Moment?
- Replies: 4
- Views: 46
Re: Temporary Dipole Moment?
Dipole moments are temporary as they are areas where an electron(s) can be found.
- Sun Nov 10, 2019 7:44 pm
- Forum: Student Social/Study Group
- Topic: Chemistry Youtube Channels
- Replies: 8
- Views: 195
Re: Chemistry Youtube Channels
Tyler DeWitt and Organic Chemistry Tutor are really great!
- Tue Nov 05, 2019 10:22 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers Question
- Replies: 2
- Views: 51
Re: Quantum Numbers Question
I believe it is 4 orbitals.
- Sun Nov 03, 2019 10:35 pm
- Forum: *Shrodinger Equation
- Topic: past exam questions session
- Replies: 2
- Views: 142
Re: past exam questions session
Ohh okay thank you so much!!
- Sun Nov 03, 2019 9:26 pm
- Forum: *Shrodinger Equation
- Topic: past exam questions session
- Replies: 2
- Views: 142
past exam questions session
Does anyone know if Dr. Lavelle's sessions tomorrow will all have the same past exam questions in all three sessions? Or will they be different in each session? Thanks in advance!
- Sun Nov 03, 2019 7:43 pm
- Forum: Electronegativity
- Topic: definitions
- Replies: 8
- Views: 183
Re: definitions
Electron affinity gives the amount of energy released when an atom gains an electron. The ionization energy is the amount of energy required to remove an electron from an atom.
- Sun Nov 03, 2019 7:40 pm
- Forum: Significant Figures
- Topic: Sig figs on midterm
- Replies: 5
- Views: 204
Re: Sig figs on midterm
We should base our sig figs based on the number of sig figs given in the question.
- Sun Nov 03, 2019 7:40 pm
- Forum: Lewis Structures
- Topic: Drawing Lewis Structures
- Replies: 5
- Views: 74
Re: Drawing Lewis Structures
Typically the structure with the most charges on the atoms closest to zero is the more stable lewis structure. Hope this makes sense!
- Sun Nov 03, 2019 7:37 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Strength
- Replies: 6
- Views: 89
Re: Bond Strength
In shorter bonds, there is more electrons closer to the nucleus. This proximity makes it so you need more energy to brake the bond. This is why shorter bond lengths are stronger.
- Sun Nov 03, 2019 7:32 pm
- Forum: Ionic & Covalent Bonds
- Topic: Strength and Length
- Replies: 18
- Views: 299
Re: Strength and Length
The longer the bond length, the weaker the bond is and the shorter the bond length, the stronger the bond is.
- Sun Oct 27, 2019 11:06 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Bonds confusion
- Replies: 7
- Views: 111
Re: Ionic Bonds confusion
I am pretty sure it is only from metal to nonmetal.
- Sun Oct 27, 2019 7:50 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 14
- Views: 179
Re: Electronegativity
The way to know electronegativity is through the periodic table. Electronegativity increases as you move to the right and it decreases as you go down the periodic table.
- Sun Oct 27, 2019 7:47 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron configurations
- Replies: 3
- Views: 58
Re: Electron configurations
The x, y, z are used to be more specific than the s,p,d,f orbitals. It helps categorize the electrons into their subsets in an orbital.
- Sun Oct 27, 2019 7:38 pm
- Forum: Bond Lengths & Energies
- Topic: Single bond vs double bond
- Replies: 14
- Views: 319
Re: Single bond vs double bond
I believe the numbers represent the length of the bonds. As for delocalized electrons, that means that electrons in a molecule are not associated with a single atom or covalent bond.
- Sun Oct 27, 2019 7:25 pm
- Forum: Ionic & Covalent Bonds
- Topic: Homework
- Replies: 13
- Views: 236
Homework
Is the next homework assignment only on the chemical bonds section?
- Thu Oct 24, 2019 11:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Accessing homework
- Replies: 2
- Views: 43
Re: Accessing homework
Thank you so much!!!
- Thu Oct 24, 2019 11:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Accessing homework
- Replies: 2
- Views: 43
Accessing homework
Can someone share the password that we need to use in order to access the class website? Please and thank you!
- Sun Oct 20, 2019 11:01 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: d block
- Replies: 2
- Views: 32
d block
Can someone explain the importance of the d-block when doing electron configurations? Please and thank you!
- Sun Oct 20, 2019 10:52 pm
- Forum: *Shrodinger Equation
- Topic: Schrodinger equation
- Replies: 4
- Views: 79
Schrodinger equation
Can someone explain the Schrodinger equation and how to know when we need to use it?
- Sun Oct 20, 2019 10:34 pm
- Forum: *Black Body Radiation
- Topic: What is it?
- Replies: 6
- Views: 299
Re: What is it?
He said that we were not going to cover black bodies so I wouldn't worry about it.
- Sun Oct 20, 2019 10:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem revision help
- Replies: 2
- Views: 33
Re: Chem revision help
Crash course videos, the organic chem tutor, and Tyler DeWitt are some good channels. They are straight forward and really helpful!
- Thu Oct 17, 2019 10:51 pm
- Forum: Properties of Light
- Topic: Homework 1B. 15
- Replies: 2
- Views: 50
Homework 1B. 15
The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 3 103 km.s2^-1. (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50 3 1016 Hz. How much energy is requir...
- Sun Oct 13, 2019 8:44 pm
- Forum: Properties of Light
- Topic: Quick question on equations
- Replies: 5
- Views: 54
Re: Quick question on equations
I'm sure that if we are given the equations we are then expected to know what the variables mean and how to use them to solve the problems.
- Sun Oct 13, 2019 8:08 pm
- Forum: Properties of Light
- Topic: 1F.5
- Replies: 1
- Views: 18
1F.5
State the hybridization of the atom in boldface red type in
each of the following molecules and ions: (a) Be Cl 2 ; (b) B H 3 ; (c) B H 42 ; (d) Si F 4 .
Can someone explain how I would complete this? Thanks!
each of the following molecules and ions: (a) Be Cl 2 ; (b) B H 3 ; (c) B H 42 ; (d) Si F 4 .
Can someone explain how I would complete this? Thanks!
- Sat Oct 12, 2019 8:15 pm
- Forum: Properties of Light
- Topic: Wave Properties of electrons
- Replies: 7
- Views: 126
Wave Properties of electrons
In the wave of properties of electrons Lecture diffraction was mentioned. Dr. Lavelle mentioned that light waves in general show diffraction patterns. I am confused as to what exactly diffraction patterns are. Can someone please explain? Thanks!
- Sat Oct 12, 2019 7:58 pm
- Forum: Properties of Light
- Topic: Homework 1B.9
- Replies: 3
- Views: 83
Re: Homework 1B.9
Thank you!
- Sat Oct 12, 2019 6:52 pm
- Forum: Properties of Light
- Topic: Homework 1B.9
- Replies: 3
- Views: 83
Homework 1B.9
A lamp rated at 32 W (1 W 5 1 J*s) emits violet light of
wavelength 420 nm. How many photons of violet light can the
lamp generate in 2.0 s? How many moles of photons are emitted
in that time interval?
Can some explain how I would approach this question? Thanks!
wavelength 420 nm. How many photons of violet light can the
lamp generate in 2.0 s? How many moles of photons are emitted
in that time interval?
Can some explain how I would approach this question? Thanks!
- Sat Oct 12, 2019 6:33 pm
- Forum: SI Units, Unit Conversions
- Topic: Weekly Posts
- Replies: 7
- Views: 122
Weekly Posts
Do we have to have the 5 posts by today or if we post Sunday will they still be counted?
- Fri Oct 11, 2019 12:11 am
- Forum: Molarity, Solutions, Dilutions
- Topic: Homework L7
- Replies: 4
- Views: 437
Re: Homework L7
Thank you, these are really helpful!
- Thu Oct 10, 2019 11:16 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Homework L7
- Replies: 4
- Views: 437
Homework L7
The camel stores the fat tristearin, C 57 H 110 O 6, in its hump. As well as being a source of energy, the fat is also a source of water because, when it is used, the reaction 2 C57H110O6(s) + 163 O2(g)---> S 114 CO2(g) + 110 H2O(l) takes place. (a) What mass of water is available from 1.00 pound (4...
- Thu Oct 03, 2019 10:12 pm
- Forum: SI Units, Unit Conversions
- Topic: Homework
- Replies: 9
- Views: 242
Homework
Does anyone know if we're supposed to write our homework in pen? Or is that just for tests?
- Thu Oct 03, 2019 9:42 pm
- Forum: Balancing Chemical Reactions
- Topic: H.5
- Replies: 2
- Views: 83
H.5
(b) Mg(N3)2(s) + H2O(l) ---> Mg(OH)2(aq) + HN3(aq)
Can someone explain how to balance this equation? I get stuck after a few steps. Thanks!
Can someone explain how to balance this equation? I get stuck after a few steps. Thanks!
- Thu Oct 03, 2019 9:20 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: HW E. 1
- Replies: 3
- Views: 123
Re: HW E. 1
Since the diameter is twice the radius, 144pm (the radius that is given) is multiplied by 2. That would be 288pm.
- Thu Oct 03, 2019 8:57 pm
- Forum: SI Units, Unit Conversions
- Topic: E.9
- Replies: 2
- Views: 71
Re: E.9
Thank you! This really helps!
- Thu Oct 03, 2019 8:56 pm
- Forum: Limiting Reactant Calculations
- Topic: Study Strategies/Youtube Videos
- Replies: 14
- Views: 286
Re: Study Strategies/Youtube Videos
I really like the way topics are explained on KhanAcademy and crash course! They are straight forward and after a few videos, they give examples for you to do.
- Thu Oct 03, 2019 8:10 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Rounding
- Replies: 12
- Views: 413
Re: Rounding
Abbey Brandt 4E wrote:The best rule I can give you is to use the least specific number of sig figs used in the question itself. For example, if in the equation there are measurements including the digits 4.98, 5.667, and 0.2, you would use 1 significant figure. Does that help?
Yes, it does. Thanks!
- Thu Oct 03, 2019 7:48 pm
- Forum: SI Units, Unit Conversions
- Topic: E.9
- Replies: 2
- Views: 71
E.9
Epsom salts consist of magnesium sulfate heptahydrate. Write its formula. (a) How many atoms of oxygen are in 5.15 g of Epsom salts? (b) How many formula units of the compound are present in 5.15 g? (c) How many moles of water molecules are in 5.15 g of Epsom salts? I am not sure how to go about thi...
- Thu Oct 03, 2019 7:33 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Rounding
- Replies: 12
- Views: 413
Re: Rounding
Okay, thank you!
- Thu Oct 03, 2019 7:27 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Rounding
- Replies: 12
- Views: 413
Rounding
How do I know when I need to round? For instance, if I were to use Lithium, which is 6.94, would it be that exact number or can I round to 7?