Search found 58 matches
- Sun Dec 08, 2019 6:20 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T-shape
- Replies: 21
- Views: 1596
Re: T-shape
A t-shape molecule has 3 atoms attached to it with 2 lone pairs
- Sun Dec 08, 2019 6:19 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AXE formula
- Replies: 7
- Views: 501
Re: AXE formula
It is only on the central atom
- Thu Dec 05, 2019 11:27 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: 6C.21b
- Replies: 3
- Views: 411
Re: 6C.21b
How can we tell that acetic acid is electron donating?
- Thu Dec 05, 2019 11:23 pm
- Forum: Bronsted Acids & Bases
- Topic: 6c 17
- Replies: 2
- Views: 181
Re: 6c 17
Are we expected to know the K values from memory?
- Thu Dec 05, 2019 2:24 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: J.9
- Replies: 4
- Views: 268
Re: J.9
The answer to part a is CH3CO2K, potassium acetate. part b is (NH4)3P04, ammonium phosphate. part c is Ca(BrO2)2, calcium bromite. Part d is Na2S, sodium sulfide.
- Sat Nov 30, 2019 5:11 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Shortcut for Formal Charge
- Replies: 19
- Views: 1592
Re: Shortcut for Formal Charge
I have a shortcut for H O N C. If Hydrogen has 1 bond, oxygen 2, nitrogen 3, carbon 4 then the formal charges will be 0.
- Sat Nov 30, 2019 3:41 pm
- Forum: Hybridization
- Topic: Pi vs Sigma Bonds
- Replies: 10
- Views: 624
Re: Pi vs Sigma Bonds
On test 2, we were asked to label sigma and pi bonds. I only knew that sigma bonds were for single bonds and double bonds had pi bonds. Can someone explain how we were supposed to label them?
- Sat Nov 30, 2019 2:33 pm
- Forum: Industrial Examples
- Topic: What do we need to know?
- Replies: 15
- Views: 1529
Re: What do we need to know?
What is one biological example of coordination compounds?
- Sat Nov 30, 2019 2:24 pm
- Forum: Air Pollution & Acid Rain
- Topic: Clean Coal vs Dirty Coal?
- Replies: 16
- Views: 1377
Re: Clean Coal vs Dirty Coal?
I believe Dr. Lavelle said that dirty coal has a higher sulfur content than clean coal
- Sat Nov 30, 2019 2:22 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 333898
Re: Final Jitters
Malik Oda 1F wrote:Working out really helps and being overconfident to keep a cool mind
Yes! Working out also really helps me with stress. :) Keep your mind and body healthy guys!
- Sat Nov 30, 2019 2:21 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 333898
Re: Final Jitters
Does anyone know when Test 2 will be passed back?
- Sat Nov 30, 2019 2:19 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: Test 2 Number of Hydrogen Bonding Sites on Caffeine
- Replies: 2
- Views: 315
Re: Test 2 Number of Hydrogen Bonding Sites on Caffeine
The correct answer is 3 but I also got it incorrect so cannot help on the why part. Hopefully someone else can help us both :)
- Sat Nov 23, 2019 2:49 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Chelates
- Replies: 1
- Views: 178
Re: Chelates
Could someone also explain what a chelate is exactly?
- Sat Nov 23, 2019 2:48 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxalato
- Replies: 3
- Views: 232
Re: Oxalato
-2
- Sat Nov 23, 2019 2:46 pm
- Forum: Naming
- Topic: Naming Rules
- Replies: 2
- Views: 193
Re: Naming Rules
I think he said he posted a list on his website. I'm not sure though, it might've been for something else.
- Sat Nov 23, 2019 2:46 pm
- Forum: Bronsted Acids & Bases
- Topic: Naming Acids and Bases
- Replies: 2
- Views: 186
Re: Naming Acids and Bases
Yes, I definitely think we will need to know the prefixes and other rules
- Wed Nov 20, 2019 2:14 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E.7
- Replies: 3
- Views: 204
Re: 2E.7
Although the answer for part C is "slightly less than 109.5", will we get credit for answering "109.5?"
- Sun Nov 17, 2019 11:36 pm
- Forum: Bond Lengths & Energies
- Topic: Test 2 Topics
- Replies: 40
- Views: 2050
Re: Test 2 Topics
Thank you so much! I didn't know what to study because I couldn't remember what was on the midterm or not. :)
- Sun Nov 17, 2019 11:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 9
- Views: 490
Re: Bond Angles
I think we will have to memorize the basic ones.
- Sun Nov 17, 2019 11:31 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Resonance and VSEPR
- Replies: 9
- Views: 535
- Sun Nov 17, 2019 11:24 pm
- Forum: Ionic & Covalent Bonds
- Topic: Study Group
- Replies: 8
- Views: 470
Re: Study Group
Ok I'll see if my schedule lines up at all!
- Sun Nov 17, 2019 11:17 pm
- Forum: Ionic & Covalent Bonds
- Topic: Study Group
- Replies: 8
- Views: 470
Re: Study Group
What days are you planning to study?
- Wed Nov 13, 2019 3:54 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Diatomic Molecules
- Replies: 6
- Views: 351
Re: Diatomic Molecules
Sorry I read my work incorrectly, I don't need an answer
- Wed Nov 13, 2019 3:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Diatomic Molecules
- Replies: 6
- Views: 351
Re: Diatomic Molecules
When calculating the molar mass of 2 moles , I calculated the 14.0067 x 4 because I thought it was equivalent to 4 nitrogen atoms. Can someone explain why I'm wrong please? I know now that the molar mass should have been just 14.0067 x 2.
- Sat Nov 09, 2019 3:20 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Distorted e- as highly polarizable
- Replies: 5
- Views: 458
Re: Distorted e- as highly polarizable
What causes electrons to be distorted?
- Sat Nov 09, 2019 3:18 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: 1A.11
- Replies: 3
- Views: 293
Re: 1A.11
I remember Balmer is n=2 because it sounds like palms and you have 2 palms :)
- Sat Nov 09, 2019 3:09 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Best Way To Study?
- Replies: 56
- Views: 3343
Re: Best Way To Study?
Doing all the homework definitely helped me prepare for the midterm.
- Sat Nov 09, 2019 3:05 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bond Strength
- Replies: 12
- Views: 1031
Re: Bond Strength
Ionic bonds are stronger because of the contrast in electronegativity.
- Sat Nov 09, 2019 3:03 pm
- Forum: Student Social/Study Group
- Topic: Test 2
- Replies: 3
- Views: 327
Re: Test 2
I might be down
- Sun Nov 03, 2019 1:09 am
- Forum: Bond Lengths & Energies
- Topic: bond length
- Replies: 6
- Views: 243
Re: bond length
Also, triple bonds are shorter and stronger than double bonds :)
- Sun Nov 03, 2019 1:06 am
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizable vs Polarizing
- Replies: 6
- Views: 270
Re: Polarizable vs Polarizing
Covalent character is a measure of how little a bond is polarized.
- Sun Nov 03, 2019 1:02 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: When to calculate formal charge
- Replies: 7
- Views: 336
Re: When to calculate formal charge
Yes that is correct. Hope this helps! :)Debora Fernandez Clemente_ 4H wrote:When determining the most stable structure do you choose the Lewis structure with the least formal charges on each atom?
- Sat Nov 02, 2019 3:55 pm
- Forum: Ionic & Covalent Bonds
- Topic: covalent character of ionic bonds
- Replies: 4
- Views: 110
Re: covalent character of ionic bonds
Is covalent character the tendency of an atom to attract electrons to itself?
- Sat Nov 02, 2019 3:47 pm
- Forum: Resonance Structures
- Topic: Delocalization
- Replies: 4
- Views: 157
Re: Delocalization
What exactly are resonance structures? All I know is that they are brought up when delocalization occurs.
- Sat Oct 26, 2019 1:45 pm
- Forum: Ionic & Covalent Bonds
- Topic: ionization
- Replies: 8
- Views: 229
Re: ionization
Removing the first electron results in a positive charge. This charge has more attraction to the electron, thus making removing the second electron more difficult.
- Sat Oct 26, 2019 1:32 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization energy
- Replies: 12
- Views: 554
Re: Ionization energy
The atomic radius generally increases from right to left across a group. It also normally increases top to bottom within a group. I use the periodic table and the inverse relationship between atomic radius and ionization energy to help with ionization energy problems.
- Sat Oct 26, 2019 1:29 pm
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 58
- Views: 4295
Re: Study Tips
Watching youtube videos from Crash Course helped me a lot in high school when reviewing concepts. When I was looking for more specific review, I would search for certain topics on Khan academy.
- Sat Oct 26, 2019 1:26 pm
- Forum: Lewis Structures
- Topic: Knowing bond types
- Replies: 2
- Views: 131
Re: Knowing bond types
The acronym HONC helps me with bonds. Hydrogen (H) prefers 1 bond, Oxygen (O) prefers 2 bonds, Nitrogen (N) prefers 3 bonds, and Carbon (C) prefers 4 bonds.
- Sat Oct 26, 2019 1:22 pm
- Forum: Ionic & Covalent Bonds
- Topic: Cation
- Replies: 23
- Views: 1615
Re: Cation
A helpful way to remember is to see the "t" in cation as a plus!
- Sat Oct 26, 2019 1:14 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Same spin
- Replies: 10
- Views: 479
Re: Same spin
Thank you for the clarification! :)
- Sat Oct 26, 2019 1:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm Format
- Replies: 11
- Views: 453
Re: Midterm Format
Does anyone know if there will be mutiple choice? Or will it solely be problems?
- Sat Oct 19, 2019 12:49 pm
- Forum: Properties of Light
- Topic: Midterm Exam
- Replies: 21
- Views: 561
Re: Midterm Exam
Is there going to be a curve for the midterm? Or is grade based on raw score?
- Sat Oct 19, 2019 12:48 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: how to prepare
- Replies: 22
- Views: 813
Re: how to prepare
I also find that attempting to do the homework and then looking at the book when you are stuck has worked better for me than simply reading the book before doing homework problems.
- Sat Oct 19, 2019 12:42 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Same spin
- Replies: 10
- Views: 479
Re: Same spin
When drawing spin, is there a reason why only half of the arrow point is used?
- Sat Oct 19, 2019 12:40 pm
- Forum: Photoelectric Effect
- Topic: 1B 15 Part C
- Replies: 4
- Views: 356
Re: 1B 15 Part C
Thank you Maeve! This helped a lot.
- Wed Oct 16, 2019 3:24 pm
- Forum: Photoelectric Effect
- Topic: 1B 15 Part C
- Replies: 4
- Views: 356
Re: 1B 15 Part C
Part A asks, "What is the wavelength of the ejected electron?" The velocity of the electron that is emitted from a metallic surface by a photon is 3.6 x 10^3 km.s^-1. Part B states no electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50x10^1...
- Wed Oct 16, 2019 12:19 pm
- Forum: DeBroglie Equation
- Topic: 1B.9 HW Question
- Replies: 8
- Views: 210
Re: 1B.9 HW Question
Thank you! This helped a lot :)
- Wed Oct 16, 2019 11:25 am
- Forum: DeBroglie Equation
- Topic: 1B.9 HW Question
- Replies: 8
- Views: 210
Re: 1B.9 HW Question
When converting from photons to moles, would it be 6.022 x 10^23 photons to 1 mole?
- Sun Oct 13, 2019 2:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How to check how many points I have this week for posting on Chemistry Community?
- Replies: 11
- Views: 346
Re: How to check how many points I have this week for posting on Chemistry Community?
I still don't know what to post to chemistry community. Is it a good idea to ask about homework questions or concepts? I feel like a lot of the questions I would ask are already answered.
- Sun Oct 13, 2019 2:53 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 416137
Re: Rusty on High School Chem [ENDORSED]
Is there anyone else that hasn't done chemistry since sophomore year? I did not even do AP, so my knowledge of chemistry in very minimal.
- Sun Oct 13, 2019 2:49 pm
- Forum: Properties of Light
- Topic: speed of light
- Replies: 10
- Views: 283
Re: speed of light
I remember learning in physics something about mediums and light. I know that a vacuum is where light can travel fastest. What is the next fastest medium?
- Sun Oct 13, 2019 2:47 pm
- Forum: Student Social/Study Group
- Topic: Turning in Extra HW problems
- Replies: 10
- Views: 400
Re: Turning in Extra HW problems
Is it effective to do the whole homework list? Or should I focus on doing a few problems from each section?
- Sun Oct 13, 2019 2:44 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Test 1 Grading
- Replies: 12
- Views: 913
Re: Test 1 Grading
Will the grading on test 1 be similar to AP style grading? Certain lines of work that demonstrate what you know can get you partial points?
- Fri Oct 04, 2019 11:45 am
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 58
- Views: 4295
Re: Study Tips
Is it a good idea to review online modules before lectures so that I can be familiar with what is going to be lectured on? Or should I review after I have had the lecture? Thank you :)
- Fri Oct 04, 2019 11:42 am
- Forum: Administrative Questions and Class Announcements
- Topic: First Test in Discussion
- Replies: 13
- Views: 690
Re: First Test in Discussion
How can I make sure that I am getting a variety of homework problems done without doing all of them? I want to do problems that will help prepare me for the test without doing too many and frying my brain.
- Fri Oct 04, 2019 11:35 am
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 333898
Re: Final Jitters
When studying, is there a schedule anyone here has for breaks? I cannot focus as long as I used to lol and can't figure how long I should study for, when to take breaks, and for how long. Does anyone have tips on how to manage time better while studying?
- Thu Oct 03, 2019 12:13 pm
- Forum: SI Units, Unit Conversions
- Topic: Sig Fig Mistakes
- Replies: 17
- Views: 806
Re: Sig Fig Mistakes
Can someone please explain the sig fig rules regarding addition and subtraction as well as multiplication and division? I forget which one is about having the same amount of decimal places and which needs the same amount of sig figs. Thank you!
- Mon Sep 30, 2019 12:05 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Question E.9 - Writing Molecular Formula + Mole Calculations
- Replies: 6
- Views: 296
Re: Question E.9 - Writing Molecular Formula + Mole Calculations
Does anyone know if we will have to memorize the basic polyatomic ions for tests?