Search found 68 matches
- Sat Dec 07, 2019 4:07 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: dien
- Replies: 3
- Views: 278
dien
What dentate is dien, nitrite and carbonate-?
- Sat Dec 07, 2019 3:24 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
- Replies: 115
- Views: 12369
Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Lyndon, I want to see the video you were trying to show during the review. Pls post it king.
- Fri Dec 06, 2019 2:41 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelate
- Replies: 1
- Views: 171
Chelate
How do we know if something can form a chelating complex like in 9C7?
- Fri Dec 06, 2019 2:27 am
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pKa and Ka
- Replies: 10
- Views: 586
pKa and Ka
Hello! What exactly are pKa and Ka and what are they used? Thanks.
- Fri Dec 06, 2019 2:12 am
- Forum: Bronsted Acids & Bases
- Topic: Strong Acids and Bases
- Replies: 2
- Views: 214
Strong Acids and Bases
Hello! Can anyone list the strong acids and bases we had to memorize please? Thanks!
- Fri Dec 06, 2019 2:07 am
- Forum: Calculating the pH of Salt Solutions
- Topic: 6D11 E and F
- Replies: 1
- Views: 197
6D11 E and F
Hello! Can anyone help me with E and F on 6D11? How do I write the chemical equation for those? Thanks! Decide whether an aqueous solution of each of the follow- ing salts has a pH equal to, greater than, or less than 7. If pH . 7 or pH , 7, write a chemical equation to justify your answer. (a) NH4B...
- Thu Dec 05, 2019 9:43 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Sig Figs?
- Replies: 1
- Views: 140
Sig Figs?
Do we have to follow sig figs for pH and pOH calculations?
- Thu Dec 05, 2019 9:05 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 6B1
- Replies: 2
- Views: 194
6B1
Hello! How do I get the molar concentration for this question? Thanks!
The molar concentration of HCl in hydrochloric acid is reduced to 12% of its initial value by dilution. What is the differ- ence in the pH values of the two solutions?
The molar concentration of HCl in hydrochloric acid is reduced to 12% of its initial value by dilution. What is the differ- ence in the pH values of the two solutions?
- Sun Dec 01, 2019 7:28 pm
- Forum: Conjugate Acids & Bases
- Topic: Difference
- Replies: 2
- Views: 162
Difference
Whats the difference between a conjugate acid and base?
- Sun Dec 01, 2019 7:24 pm
- Forum: Naming
- Topic: Naming Order
- Replies: 5
- Views: 346
Naming Order
What was the naming order again. and what is a good way to memorize it?
- Sun Dec 01, 2019 7:21 pm
- Forum: Hybridization
- Topic: Textbook Focus
- Replies: 2
- Views: 223
Textbook Focus
Hello! The textbook puts a big focus on the sp^3 hybrid orbital. Why is that? I just want to know why it is important
- Sun Dec 01, 2019 7:19 pm
- Forum: Hybridization
- Topic: Order When Writing
- Replies: 5
- Views: 280
Order When Writing
Simple question but on the final do we write the Hybridization as dsp^3 and d^2sp^3 or sp^3d and sp^3d^2?
- Sun Dec 01, 2019 7:17 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Difference in Concentrations
- Replies: 3
- Views: 148
Difference in Concentrations
Why do acids have a higher H30+ concentration and why do bases have a higher OH- concentration?
- Sun Dec 01, 2019 7:15 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pH of Weak Acid and Bases
- Replies: 4
- Views: 330
pH of Weak Acid and Bases
Hello! How do we calculate the pH when the acid or base is weak?
- Sun Nov 24, 2019 2:47 am
- Forum: Biological Examples
- Topic: Transplatin?
- Replies: 3
- Views: 234
Transplatin?
Why is cisplatin able to be used as an anticancer treatment, but transplatin isn't? How does their structures change their functions?
- Sun Nov 24, 2019 2:44 am
- Forum: Sigma & Pi Bonds
- Topic: Rotation
- Replies: 3
- Views: 229
Rotation
Why can sigma bonds rotate but pi bonds can't?
- Sun Nov 24, 2019 2:42 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Organic vs Inorganic Acids
- Replies: 1
- Views: 128
Organic vs Inorganic Acids
Why do organic acid tend to be weaker than inorganic acids? What is the difference in their structure?
- Wed Nov 20, 2019 9:54 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: Ionic
- Replies: 6
- Views: 429
Ionic
So is ionic an inter and intramolecular force?
- Wed Nov 20, 2019 9:46 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: Order of Strength
- Replies: 2
- Views: 175
Re: Order of Strength
Thanks!
- Wed Nov 20, 2019 9:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 2
- Replies: 7
- Views: 514
Test 2
If a structure is bent, do have to explicitly say that it is a ?bent trigonal planar and a bent tetrahedral" or can we just say "bent"?
- Wed Nov 20, 2019 9:33 pm
- Forum: Sigma & Pi Bonds
- Topic: Pz Sigma Bond
- Replies: 1
- Views: 142
Pz Sigma Bond
Hello! Why does Pz form a sigma bond while the other p orbitals form a pi bond?
- Wed Nov 20, 2019 9:29 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: Order of Strength
- Replies: 2
- Views: 175
Order of Strength
Hello! Can anyone help me by ordering the intermolecular forces from weakest to strongest.
- Fri Nov 15, 2019 12:58 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Remembering Molecular Geometric Shapes
- Replies: 2
- Views: 147
Re: Remembering Molecular Geometric Shapes
You could examine the amount of lone pairs would impact electron repulsion in turn impacting the shape.
- Fri Nov 15, 2019 12:55 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Octahedral
- Replies: 5
- Views: 383
Re: Octahedral
The presence of lone pairs and number of bonded atoms is the difference in the shapes. Octahedral has no lone pairs with 6 bonded atoms. Square Pyramidal has one lone pair with 5 bonded atoms. Square planar has two lone pairs with 4 bonded atoms. The single lone pair of Square Pyramidal creates a re...
- Fri Nov 15, 2019 12:45 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent shape and angles
- Replies: 6
- Views: 370
Re: Bent shape and angles
AX2E has a bond angle near 120 degrees while AX2E2 has a bond angle near 109.5 degrees.
- Fri Nov 15, 2019 12:39 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T shape
- Replies: 7
- Views: 465
Re: T shape
A T-Shape is created when there is one central atom with two lone pairs and three bonded atoms. The shape comes from the electron repulsion of the lone pairs. Some examples are ClF3 and BrF3.
- Fri Nov 15, 2019 12:33 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: bond angles
- Replies: 10
- Views: 465
Re: bond angles
I think the key would be just memorizing the bond angles of each shape, or at least see the pattern of what shapes look like and how similar shapes have similar or same bond angles.
- Fri Nov 15, 2019 12:13 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Other shapes
- Replies: 3
- Views: 213
Other shapes
For the test, do we need need to know t-shaped and see-saw? I saw it in the practice and the textbook, but it wasn't mentioned in Wednesday's lecture.
- Mon Nov 11, 2019 10:51 am
- Forum: Electronegativity
- Topic: Noble Gases
- Replies: 40
- Views: 12569
Re: Noble Gases
They are typically not included in the trend since the electronegativity trend is used for bonding. Noble gases already have full valence shells, so they tend not to bond with other elements, resulting in there not being a need for their inclusion in the trend.
- Mon Nov 11, 2019 10:46 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: Hydrogen Bonding in Biology
- Replies: 2
- Views: 146
Hydrogen Bonding in Biology
Why is hydrogen bonding so important in parts of biology such as DNA structure?
- Mon Nov 11, 2019 10:39 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: The Strength of Hydrogen Bonding
- Replies: 4
- Views: 126
The Strength of Hydrogen Bonding
Are hydrogen bonds the strongest intermolecular force? If so why? Thanks.
- Mon Nov 11, 2019 10:31 am
- Forum: Bond Lengths & Energies
- Topic: Jokes
- Replies: 1
- Views: 70
Re: Jokes
This is some quality content.
- Mon Nov 11, 2019 10:30 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: Hydrogen Bonding with Elements
- Replies: 2
- Views: 114
Hydrogen Bonding with Elements
Why are Nitrogen, Oxygen and Fluorine the main atoms in hydrogen bonding? Thanks.
- Mon Nov 11, 2019 10:27 am
- Forum: Bond Lengths & Energies
- Topic: Shorter bond lengths
- Replies: 12
- Views: 669
Shorter bond lengths
Why do more bonds lead to shorter bond lengths? Like why are double bonds shorter than single bonds?
- Mon Nov 11, 2019 10:25 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: London Forces??
- Replies: 3
- Views: 174
London Forces??
Do all molecules have London forces? If so why? Thanks.
- Sat Nov 02, 2019 2:13 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 4pi?
- Replies: 2
- Views: 158
4pi?
Hello! I just have a conceptual question about the equation. Why is Planck's constant divided by 4pi?
- Sat Nov 02, 2019 2:11 pm
- Forum: Octet Exceptions
- Topic: Exceptions?
- Replies: 5
- Views: 230
Exceptions?
How do we know which elements typically are exceptions to the octet rule? Do we have to memorize them or is there a specific trend or group in the periodic table?
- Sat Nov 02, 2019 2:02 pm
- Forum: Trends in The Periodic Table
- Topic: Exceptions
- Replies: 3
- Views: 103
Exceptions
Can someone please tell me some exceptions to the Periodic Table trends?
- Sat Nov 02, 2019 2:02 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy from the Review
- Replies: 4
- Views: 138
Ionization Energy from the Review
Yesterday, Lyndon showed an exception to the Ionization Energy trend where Nitrogen had more than Oxygen. Can someone please explain why?
- Sat Nov 02, 2019 1:57 pm
- Forum: Electronegativity
- Topic: Figuring it out without the trend?
- Replies: 4
- Views: 126
Figuring it out without the trend?
Hello! If two elements seem like they are the about the same distance from the top right of the periodic table, how do we determine which one is more electronegative?
- Tue Oct 29, 2019 3:29 am
- Forum: Ionic & Covalent Bonds
- Topic: Valence Electrons?
- Replies: 15
- Views: 944
Valence Electrons?
Hello! This is a really simple question, but how do you find the number of valence electrons for transition metals? Thanks. :)
- Sat Oct 26, 2019 2:17 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Checking bonding
- Replies: 3
- Views: 193
Checking bonding
Is checking the formal charge the only way to make sure your lewis structure is correct? Or is there another method?
- Sat Oct 26, 2019 2:12 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Noble Gas Configuration
- Replies: 2
- Views: 227
Noble Gas Configuration
For the test do you guys know if we have to write the whole electron configuration or can we just write the noble gas configuration? Thanks :)
- Sat Oct 26, 2019 2:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: Atomic Radius
- Replies: 4
- Views: 380
Atomic Radius
Why does atomic radius decrease from left to right and increase down the period. Thanks :)
- Sat Oct 26, 2019 2:07 pm
- Forum: Lewis Structures
- Topic: Shape of bonds?
- Replies: 2
- Views: 101
Shape of bonds?
Hello! For the test do we need to know what shapes the bond make like squares or rings? If so, how do I determine what shape the molecule makes.
- Sat Oct 26, 2019 2:03 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Special elements
- Replies: 2
- Views: 103
Special elements
Hello! Professor Lavelle was talking about specific elements like chromium that don't follow typical electron configuration. Can anyone tell me what are the other ones pls. :)
- Thu Oct 24, 2019 5:36 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration p orbital
- Replies: 2
- Views: 102
Electron Configuration p orbital
For tests, do we have to show the p orbital as px, py and pz or can we just leave it as p?
- Fri Oct 18, 2019 12:50 am
- Forum: DeBroglie Equation
- Topic: 1A13
- Replies: 1
- Views: 111
1A13
I am really stuck. Can anyone help me understand how to approach this problem? Thanks :) 1A.13 Use the Rydberg formula for atomic hydrogen to calculate the wavelength of radiation generated by the transition from n = 2 to n = 1. (b) What is the name given to the spectroscopic series to which this tr...
- Fri Oct 18, 2019 12:45 am
- Forum: Properties of Light
- Topic: Where to find equations?
- Replies: 5
- Views: 172
Where to find equations?
Is there a source in the textbook or online where I can find the equations needed to complete questions in the quantum section?
- Fri Oct 18, 2019 12:44 am
- Forum: Properties of Light
- Topic: What are the units of hertz
- Replies: 41
- Views: 1998
Re: What are the units of hertz
1 cycle * s^(-1)
- Fri Oct 18, 2019 12:39 am
- Forum: Einstein Equation
- Topic: Joules units
- Replies: 6
- Views: 910
Joules units
Hello can anyone explain to me why Joules in Planck's Constant is kg x m^2 x s? Thanks.
- Fri Oct 18, 2019 12:36 am
- Forum: Einstein Equation
- Topic: Mass of a proton and neutron
- Replies: 3
- Views: 181
Mass of a proton and neutron
Hello where do we find the mass of a proton and neutron?
- Fri Oct 18, 2019 12:35 am
- Forum: Properties of Light
- Topic: 1A9 Table
- Replies: 2
- Views: 148
1A9 Table
In 1A9 how do I figure out what type of radiation each event matches to thanks? 1A9. A college student recently had a busy day. Each of the stu- dent’s activities on that day (reading, getting a dental x-ray, mak- ing popcorn in a microwave oven, and acquiring a suntan) involved radiation from a dif...
- Sun Oct 13, 2019 7:59 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Angstrom's Constant
- Replies: 5
- Views: 349
Re: Angstrom's Constant
You would convert it like any other prefix for SI Units. So you would multiply by 10s if it is less than an angstrom and divide by 10s if it is more than an angstrom.
- Fri Oct 11, 2019 12:07 am
- Forum: Molarity, Solutions, Dilutions
- Topic: G5
- Replies: 2
- Views: 388
G5
Hello I need help on G5. How would I approach the problem? A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0-mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transf...
- Fri Oct 11, 2019 12:01 am
- Forum: Limiting Reactant Calculations
- Topic: Actual Yield
- Replies: 6
- Views: 542
Re: Actual Yield
The actual yield must be given because it is based off the product measured in the experimental data. However, the theoretical yield will have to be found in some questions.
- Thu Oct 10, 2019 11:58 pm
- Forum: Photoelectric Effect
- Topic: Wavelengths?
- Replies: 8
- Views: 495
Wavelengths?
Hello. I forgot the reasoning behind why light with shorter wavelengths results in more electron emissions. Can someone please help? :)
- Thu Oct 10, 2019 11:52 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Homework L7
- Replies: 4
- Views: 1109
Re: Homework L7
You would approach both part a and b the same way you would approach others problems in the L section. 1)Divided by the molar mass of the molecule that is given (C57 H110 O6) 2)Multiply by (moles of the mole it is asking for divided by moles of the molecule that is given) 3)Multiply by the molar mas...
- Thu Oct 10, 2019 7:55 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Module Question Help
- Replies: 2
- Views: 444
Module Question Help
Can someone help me with this question from the module pls? 5.00 g of KMnO4 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 water, what is the concentration of the solution in the 2nd flask? Molar Masses: K (...
- Thu Oct 10, 2019 7:23 pm
- Forum: Properties of Light
- Topic: Frequency
- Replies: 2
- Views: 121
Frequency
Can someone explain to me why frequency is represented as "v" in the equation c = v ( lambda)?
- Thu Oct 03, 2019 11:16 pm
- Forum: Empirical & Molecular Formulas
- Topic: 100 Gram Procedure
- Replies: 4
- Views: 185
Re: 100 Gram Procedure
Using 100 grams makes it easier to convert from percentages to grams. For example, if the percentage is 48% then you can convert it to 48 grams since they are both out of 100. This helps you avoid extra steps and extra work to convert the percentages to masses. Hope this helps. :)
- Thu Oct 03, 2019 11:09 pm
- Forum: Balancing Chemical Reactions
- Topic: Diatomic elements?
- Replies: 8
- Views: 323
Re: Diatomic elements?
Thank you guys for the help :)
- Thu Oct 03, 2019 11:05 pm
- Forum: Significant Figures
- Topic: When to round for sig figs?
- Replies: 12
- Views: 487
When to round for sig figs?
Hey I was wondering when we should round for sig figs during our calculations? Should we do it after each step or at the end of our calculation?
- Thu Oct 03, 2019 10:49 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Does the state of matter mean anything right now?
- Replies: 4
- Views: 131
Does the state of matter mean anything right now?
Hey guys! Is the state of matter for the reactants and products significant for what we are doing right now in chemistry? Like will it impact balancing equations?
- Thu Oct 03, 2019 10:20 pm
- Forum: Balancing Chemical Reactions
- Topic: State Symbols
- Replies: 5
- Views: 321
Re: State Symbols
I would include the state of matter because it helps show what is actually going on in the chemical reaction. Also, it is just good to get into the habit for later on in the course. :)
- Thu Oct 03, 2019 10:13 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro's number
- Replies: 9
- Views: 500
Re: Avogadro's number
Thank you Charlee!
- Thu Oct 03, 2019 10:12 pm
- Forum: Balancing Chemical Reactions
- Topic: Diatomic elements?
- Replies: 8
- Views: 323
Diatomic elements?
Why do the seven diatomic elements (Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Iodine, and Bromine) have to come in pairs? Why can they not stand alone in a chemical equation?
- Thu Oct 03, 2019 10:09 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro's number
- Replies: 9
- Views: 500
Avogadro's number
Hey, I was just curious. What does Avogadro's number actually represent? Thank you guys. :)