Search found 52 matches
- Sun Dec 08, 2019 11:02 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: bent v. angular
- Replies: 27
- Views: 1531
Re: bent v. angular
Bent and angular are the same shape.
- Sun Dec 08, 2019 10:51 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent Shape
- Replies: 31
- Views: 3016
Re: Bent Shape
A bent shape can have either one lone pair or two lone pairs depending on their electron geometry.
- Sun Dec 08, 2019 10:48 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Cis vs Trans
- Replies: 22
- Views: 1763
Re: Cis vs Trans
Cis molecules are polar whereas trans molecules are nonpolar.
- Sun Dec 08, 2019 10:46 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: -ate
- Replies: 11
- Views: 736
Re: -ate
You would add an -ate to the end of metal when the overall charge of the coordination complex is negative.
Re: "Ferrate"
When the coordination compund has an overall negative charge, you would use ferrate instead of iron as the metals in a negative coordination complex end in
-ate.
-ate.
- Sun Dec 08, 2019 10:40 pm
- Forum: Naming
- Topic: Ferrate and Cuprate? [ENDORSED]
- Replies: 5
- Views: 554
Re: Ferrate and Cuprate? [ENDORSED]
The the coordination complex has an overall negative charge, you would use ferrate instead of iron and cuprate instead of copper.
Re: Naming
When the ligand already has a prefix, including polydentate ligands, you would use those prefixes.
- Sat Nov 30, 2019 4:30 pm
- Forum: Resonance Structures
- Topic: Formal Charge Question
- Replies: 16
- Views: 938
Re: Formal Charge Question
The formal charge of a resonance structure should be equal to the atom's overall charge.
- Sat Nov 30, 2019 4:28 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Shortcut for Formal Charge
- Replies: 19
- Views: 1686
Re: Shortcut for Formal Charge
A quick way to calculate formal charge is to count subtract the sum of the number of lone electrons and bonds by the number of valence electrons.
- Sat Nov 30, 2019 4:25 pm
- Forum: Dipole Moments
- Topic: Dipole Induced- Dipole Induced
- Replies: 13
- Views: 1184
Re: Dipole Induced- Dipole Induced
Induced dipole-induced dipole forces are the weakest intermolecular force and occur between nonpolar molecules.
- Sat Nov 30, 2019 4:23 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma & Pi Bonds
- Replies: 9
- Views: 640
Re: Sigma & Pi Bonds
Sigma bonds are stronger than pi bonds because the atomic orbitals forming sigma bonds overlap to a greater extent than the orbitals forming pi bonds.
- Sat Nov 30, 2019 4:19 pm
- Forum: Bond Lengths & Energies
- Topic: Strongest Bonds
- Replies: 11
- Views: 915
Re: Strongest Bonds
The next favorable bond would be ion-dipole.
- Tue Nov 26, 2019 11:42 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 9
- Views: 830
Re: Formal Charge
I write the calculations on the side and write the final answer next to each atom.
- Tue Nov 26, 2019 11:35 am
- Forum: Bond Lengths & Energies
- Topic: Bond Length
- Replies: 22
- Views: 1297
Re: Bond Length
The exact bond length is derived from experiments, but relative bond lengths can be determined from bond order.
- Tue Nov 26, 2019 11:33 am
- Forum: Dipole Moments
- Topic: Dipole Moment
- Replies: 10
- Views: 875
Re: Dipole Moment
The periodic table provides a general trend of electronegativity, and you can determine whether a molecule has a dipole moment and is polar from the shape using the VSEPR model.
- Tue Nov 26, 2019 11:28 am
- Forum: Dipole Moments
- Topic: Hydrogen Bonding
- Replies: 20
- Views: 1172
Re: Hydrogen Bonding
Yes, an H atom has to bond with an N, O, or F atom to be considered as a hydrogen bond.
- Tue Nov 26, 2019 11:24 am
- Forum: Sigma & Pi Bonds
- Topic: Molecular Shape
- Replies: 11
- Views: 736
Re: Molecular Shape
Sigma bonds allow for rotation whereas pi bonds do not. However, single, double, and triple bonds are all considered as only one region of electron density.
- Sun Nov 17, 2019 8:35 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent or Angular
- Replies: 13
- Views: 1133
Re: Bent or Angular
Bent and angular are synonymous, but the textbook uses the term "angular."
- Sun Nov 17, 2019 8:33 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: seesaw
- Replies: 9
- Views: 672
Re: seesaw
When a molecule has 4 bonding pairs and 1 lone pair, the shape is seesaw.
- Sun Nov 17, 2019 8:32 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs
- Replies: 6
- Views: 620
Re: Lone Pairs
The actual shape of the molecule is dependent on the bonding electron pairs.
- Sun Nov 17, 2019 8:30 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Electronegativity
- Replies: 5
- Views: 311
Re: Electronegativity
You should know the general periodic table trend for electronegativity because it's relevant when drawing Lewis structures.
- Sun Nov 17, 2019 8:27 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: What is VSPER
- Replies: 14
- Views: 1019
Re: What is VSPER
VSEPR stands for "valence shell electron pair repulsion" and we don't need to have the acronym memorized.
- Sun Nov 10, 2019 2:16 pm
- Forum: Dipole Moments
- Topic: Polar
- Replies: 9
- Views: 589
Re: Polar
A higher difference in electronegativity results in a polar molecule.
- Sun Nov 10, 2019 2:14 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarisability vs Polarizing Power
- Replies: 15
- Views: 1171
Re: Polarisability vs Polarizing Power
Smaller cations with a larger effective nuclear charge have a higher polarizing power whereas larger anions are have a higher polarizability.
- Sun Nov 10, 2019 2:11 pm
- Forum: Bond Lengths & Energies
- Topic: Test 2 Topics
- Replies: 40
- Views: 2271
Re: Test 2 Topics
Test 2 covers what we learn after the midterm.
- Sun Nov 10, 2019 2:10 pm
- Forum: Electronegativity
- Topic: Periodic Trend
- Replies: 13
- Views: 823
Re: Periodic Trend
Electronegativity increases up the group and across a period.
- Sun Nov 10, 2019 2:08 pm
- Forum: Octet Exceptions
- Topic: octet exceptions
- Replies: 11
- Views: 598
Re: octet exceptions
All elements in period 3 and after can have an expanded octet.
- Sat Nov 02, 2019 10:43 am
- Forum: Lewis Structures
- Topic: Valence Electrons from Periodic Table
- Replies: 10
- Views: 692
Re: Valence Electrons from Periodic Table
The number of valence electrons is determined by the group number.
- Sat Nov 02, 2019 10:37 am
- Forum: Octet Exceptions
- Topic: More than 8 valence e-
- Replies: 8
- Views: 419
Re: More than 8 valence e-
Why can d orbitals carry extra electrons?
- Sat Nov 02, 2019 10:35 am
- Forum: Bond Lengths & Energies
- Topic: Single bond vs double bond
- Replies: 14
- Views: 899
Re: Single bond vs double bond
The Angstrom is the unit that describes bond length. A double bond has a shorter bond length than a single bond.
- Sat Nov 02, 2019 10:29 am
- Forum: Electronegativity
- Topic: Electronegativity on Test
- Replies: 7
- Views: 263
Re: Electronegativity on Test
How should we take account of electronegativity when drawing Lewis structures?
- Sat Nov 02, 2019 10:25 am
- Forum: General Science Questions
- Topic: Can We Take The Final In Pencil?
- Replies: 14
- Views: 1631
Re: Can We Take The Final In Pencil?
All tests and midterms have to written in pen.
- Sat Oct 26, 2019 11:13 pm
- Forum: Ionic & Covalent Bonds
- Topic: Cation
- Replies: 23
- Views: 1837
Re: Cation
Another difference between cations and anions is that cations are usually smaller than their parent atom and anions are usually larger than their parent atom.
- Sat Oct 26, 2019 11:10 pm
- Forum: Trends in The Periodic Table
- Topic: blocks
- Replies: 13
- Views: 659
Re: blocks
Yes, knowing the blocks is very beneficial when writing out electron configurations.
- Sat Oct 26, 2019 11:07 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Midterm
- Replies: 11
- Views: 565
Re: Midterm
Will the midterm cover the chemical bond section?
- Sat Oct 26, 2019 11:05 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Extra help
- Replies: 8
- Views: 502
Re: Extra help
I like watching Khan Academy and Organic Chemistry both to reinforce and clarify certain topics!
- Sat Oct 26, 2019 11:03 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Online Modules
- Replies: 7
- Views: 239
Re: Online Modules
As of right now, the modules cover Week 1 and 2 material.
- Sun Oct 20, 2019 4:18 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Advice for studying
- Replies: 92
- Views: 7822
Re: Advice for studying
After going to lecture, I like to immediately read the material covered in the textbook to solidify the concepts. I also try to do the corresponding homework problems right away and I'll go to TA hours if I'm confused about anything.
- Sat Oct 19, 2019 9:45 pm
- Forum: Properties of Electrons
- Topic: Angstrom Conversion
- Replies: 12
- Views: 481
Re: Angstrom Conversion
An angstrom is equivalent to 1*10^(-10) meters and is usually used to measure bond length.
- Sat Oct 19, 2019 9:42 pm
- Forum: Einstein Equation
- Topic: E=hv [ENDORSED]
- Replies: 52
- Views: 18463
Re: E=hv [ENDORSED]
With this particle equation, E represents the energy of the photon.
- Sat Oct 19, 2019 9:39 pm
- Forum: Properties of Light
- Topic: Baler v. Lyman Series
- Replies: 10
- Views: 538
Re: Baler v. Lyman Series
The Balmer series applies to the visible light region and the Lyman series applies to the UV region of the spectrum.
- Sat Oct 19, 2019 9:35 pm
- Forum: General Science Questions
- Topic: Tests
- Replies: 9
- Views: 436
Re: Tests
Although Test 1 contained all the unit conversions needed, I believe it will be safer and easier to memorize the main conversions especially for the midterm.
- Sat Oct 12, 2019 7:56 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Test 1 [ENDORSED]
- Replies: 107
- Views: 23370
Re: Test 1 [ENDORSED]
We'll most likely get our tests back during our next discussion.
- Sat Oct 12, 2019 7:48 pm
- Forum: Properties of Light
- Topic: Frequency vs. Wavelength
- Replies: 15
- Views: 718
Re: Frequency vs. Wavelength
Frequency and wavelength have an inverse relationship as when the frequency increases, the wavelength decreases and vice versa.
- Sat Oct 12, 2019 7:43 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 7955
Re: Week 2 Homework Problems [ENDORSED]
I think we're only supposed to turn in problems from the quantum section this week.
- Sat Oct 12, 2019 7:33 pm
- Forum: Properties of Light
- Topic: Speed of Light
- Replies: 41
- Views: 2866
Re: Speed of Light
The speed of light is a constant as it doesn't change.
- Sat Oct 12, 2019 7:27 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3705953
Re: Post All Chemistry Jokes Here
What should you do if no one laughs at your chemistry jokes?
Keep telling them until you get a reaction.
Keep telling them until you get a reaction.
- Sun Oct 06, 2019 10:20 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 152581
Re: Reading the textbook
I personally find reading the textbook very beneficial just so I can go in depth on the topics covered. I usually have to read the text more than once to really comprehend the material so I break the text into small sections.
- Sun Oct 06, 2019 10:12 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Reactions
- Replies: 25
- Views: 2170
Re: Balancing Reactions
Chemical reactions have to be balanced in order to satisfy the law of conservation of matter which states that matter is neither created nor destroyed in a closed system. Therefore, the amount of element in the reactant and poduct sides have to be equal.
- Sun Oct 06, 2019 10:02 pm
- Forum: Empirical & Molecular Formulas
- Topic: What decimal place to round to when taking masses from the Periodic Table?
- Replies: 19
- Views: 2990
Re: What decimal place to round to when taking masses from the Periodic Table?
I would say to use the entire number given on the periodic table and then to round your final answer based on the rules of sig figs.
- Sun Oct 06, 2019 9:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student - Part II [ENDORSED]
- Replies: 298
- Views: 278621
Re: Advice from a Medical Student - Part II [ENDORSED]
It was super inspiring and motivating to hear your experience as a medical student! As a first year premed, I'm wondering how you were able to balance your social and academic life?
- Sun Oct 06, 2019 9:51 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 382418
Re: Final Jitters
One of the most helpful things I've learned over the past couple years on how to ease jitters before exams is to not discuss the content or try to cram in last minute material right before taking the test. Instead, I like to take deep breathes in order to calm myself down and get myself in the right...