Search found 50 matches
- Sun Dec 08, 2019 10:09 pm
- Forum: Biological Examples
- Topic: Cisplatin [ENDORSED]
- Replies: 19
- Views: 1249
Re: Cisplatin [ENDORSED]
It is more effective than transplatin because it binds twice instead of once making it more effective.
- Sun Dec 08, 2019 10:02 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL
- Replies: 7
- Views: 551
Re: FINAL
I thought it was pretty difficult compared to the questions we practiced :(.
- Sun Dec 08, 2019 10:01 pm
- Forum: Hybridization
- Topic: 2sp2 and sp2
- Replies: 10
- Views: 804
Re: 2sp2 and sp2
I think you only need to write 2 if the questions asks for it specifically.
- Sun Dec 08, 2019 10:00 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: -ido vs -o
- Replies: 5
- Views: 592
Re: -ido vs -o
-ido is the most updated IUPAC naming, but either works.
- Fri Dec 06, 2019 12:42 pm
- Forum: Biological Examples
- Topic: EDTA
- Replies: 1
- Views: 239
Re: EDTA
EDTA prevents enzymatic activity, is hexadentate, and removes metals from solutions.
- Thu Dec 05, 2019 1:53 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate compounds
- Replies: 1
- Views: 141
Re: Polydentate compounds
I think a single lone pair can be counted because in lecture, he used the example NH3 with only one lone pair.
- Thu Dec 05, 2019 1:51 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: chelate
- Replies: 3
- Views: 199
Re: chelate
A ligand chelates when when it forms a ring including the central atom. It must be polydentate.
- Thu Dec 05, 2019 1:49 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Weak vs Strong acids and bases
- Replies: 6
- Views: 451
Re: Weak vs Strong acids and bases
A strong base would have a higher pH because it accepts more protons.
- Thu Dec 05, 2019 1:47 pm
- Forum: Biological Examples
- Topic: Biological questions on the final
- Replies: 5
- Views: 461
Re: Biological questions on the final
I would know the examples that he explained during lecture, such as hemoglobin.
- Thu Dec 05, 2019 1:45 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: -ate
- Replies: 11
- Views: 686
Re: -ate
Add -ate to the end of the metal name if the complex is negative
- Fri Nov 22, 2019 5:43 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis & Bronsted
- Replies: 3
- Views: 243
Re: Lewis & Bronsted
Same concept, just named after different people/theories.
- Fri Nov 22, 2019 5:42 pm
- Forum: Coordinate Covalent Bonds
- Topic: Coordinate vs polar covalent
- Replies: 10
- Views: 2408
Re: Coordinate vs polar covalent
For the post above, a bronsted acid is a proton donor and a lewis acid in an e- acceptor.
- Fri Nov 22, 2019 5:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: T-shaped v. Trigonal pyramid
- Replies: 9
- Views: 518
Re: T-shaped v. Trigonal pyramid
Yes, that is correct!
- Mon Nov 18, 2019 12:59 pm
- Forum: Student Social/Study Group
- Topic: Test 2
- Replies: 5
- Views: 313
Re: Test 2
Shapes, polarity, and sigma/pi bonds will be on the test. So up to Monday's first slide!
- Mon Nov 18, 2019 12:56 pm
- Forum: Bond Lengths & Energies
- Topic: Curve
- Replies: 4
- Views: 403
Re: Curve
I don't think the midterm grades itself are curved. Only the class at the end.
- Fri Nov 15, 2019 11:47 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: regions of electron density
- Replies: 7
- Views: 522
Re: regions of electron density
lone pair, bond, or radical
- Fri Nov 15, 2019 11:37 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 9
- Views: 782
Re: Formal Charge
A side question: is there a way to tell just by looking because some people derive it really quickly in their head. Just wondering.
- Fri Nov 15, 2019 11:35 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 Topics
- Replies: 11
- Views: 719
Re: Test Topics
In class he said everything up to sigma and pi bonds (which we will learn on Monday), so IMF, shapes, and bonds.
- Fri Nov 15, 2019 11:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining if a molecule is polar or non polar
- Replies: 9
- Views: 843
Re: Determining if a molecule is polar or non polar
I don't think we need to know exact values, but we should know generally which atom is the most electronegative in relation to others in the molecule.
- Thu Nov 14, 2019 4:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: why are double bonds equally weighted as single ones when drawing models?
- Replies: 10
- Views: 1943
Re: why are double bonds equally weighted as single ones when drawing models?
I am not completely sure, but yes they are only counted as one. Maybe because e- are so light that it is insignificant.
- Thu Nov 07, 2019 11:08 am
- Forum: Trends in The Periodic Table
- Topic: Midterm Review Problem 10 d
- Replies: 5
- Views: 462
Re: Midterm Review Problem 10 d
If you draw out the three orbitals, N is more stable because they are each filled with one e-, thus O would want to lose one to become more stable.
- Thu Nov 07, 2019 11:06 am
- Forum: Photoelectric Effect
- Topic: Midterm 1
- Replies: 9
- Views: 654
Re: Midterm 1
I also struggled with this. I was thinking it has something to do with Avogadro's number? I'm not completely sure.
- Thu Nov 07, 2019 11:04 am
- Forum: Student Social/Study Group
- Topic: Class Grading
- Replies: 44
- Views: 3516
Re: Class Grading
How exactly does this work? So is the class curved in the end?
- Thu Nov 07, 2019 10:58 am
- Forum: Photoelectric Effect
- Topic: Maximum Wavelength
- Replies: 2
- Views: 254
Re: Maximum Wavelength
I agree with the answer above, but shorter wavelengths have more energy so I'm assuming by "maximum wavelength" they mean the longest and least energy wavelength it would take to eject an electron.
- Thu Nov 07, 2019 10:52 am
- Forum: Lewis Structures
- Topic: Does the shape that I draw the Lewis structure matter?
- Replies: 14
- Views: 945
Re: Does the shape that I draw the Lewis structure matter?
Not for now, but we probably will have to take it into account when we learn about different shapes later!
- Sun Nov 03, 2019 10:16 am
- Forum: Electronegativity
- Topic: electronegativity trend
- Replies: 9
- Views: 633
Re: electronegativity trend
The distance between the nucleus and the electrons increase, therefore decreasing the attraction for e-.
- Fri Nov 01, 2019 11:37 am
- Forum: Ionic & Covalent Bonds
- Topic: How does one find a most likely charge for ions for a given element?
- Replies: 6
- Views: 470
Re: How does one find a most likely charge for ions for a given element?
The atom would lose its unpaired electrons to become an ion or gain e- to fill its shell. For example, H would lose 1 e- to become H+1 and F would gain an e- to fill its shell to come F-1.
- Thu Oct 31, 2019 5:05 pm
- Forum: Bond Lengths & Energies
- Topic: Bond energies
- Replies: 4
- Views: 208
Re: Bond energies
I am not entirely sure in which context you are asking, but triple > double > single bonds in decreasing order.
- Wed Oct 30, 2019 9:30 pm
- Forum: Ionic & Covalent Bonds
- Topic: Radicals
- Replies: 9
- Views: 584
Re: Radicals
For example, CH3 is a radical because there is an unpaired electron. Food supplements, such as vitamins, can react with radicals before they cause damage.
- Wed Oct 30, 2019 9:26 pm
- Forum: Electronegativity
- Topic: Electronegativity vs. Electron Affinity
- Replies: 7
- Views: 286
Re: Electronegativity vs. Electron Affinity
Electronegativity is how "greedy" atoms are for e-. So atoms with 7 valence e- are more electronegative than atoms with 8e-. Electron affinity is the amount of energy released when an electron is added to a neutral atom.
- Sun Oct 27, 2019 11:51 pm
- Forum: Student Social/Study Group
- Topic: Study Tips
- Replies: 58
- Views: 4312
Re: Study Tips
I like the compile my notes into one big study guide on google docs and also do (redo) practice problems from the homework.
- Thu Oct 24, 2019 4:33 pm
- Forum: Properties of Electrons
- Topic: hw
- Replies: 6
- Views: 342
Re: hw
I think we can because we were finishing up the chapter this week in lecture.
- Thu Oct 24, 2019 4:06 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: HW 1E.23
- Replies: 4
- Views: 239
HW 1E.23
I am a little confused on how to figure out the number of unpaired electrons for question 1E.23. For example, how many unpaired e- would be in Ga or Ge? Can someone explain? Thanks!
- Thu Oct 24, 2019 1:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: strength of bonds
- Replies: 14
- Views: 959
Re: strength of bonds
Usually shorter bonds (in distance, Angstroms) are stronger than longer bonds.
- Wed Oct 23, 2019 6:01 pm
- Forum: Lewis Structures
- Topic: chemical formulas
- Replies: 3
- Views: 142
Re: chemical formulas
I am not completely sure, but in the examples in class, they were given. For more commonly known compounds, we should be able to derive the chemical formula with the name.
- Wed Oct 16, 2019 9:08 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Stern and Gerlach
- Replies: 5
- Views: 243
Re: Stern and Gerlach
I wrote down in my notes that this experiment discovered the electron spin. Silver atoms with one unpair e- split into two beam. Thus, e- can spin up or down, so we use quantum numbers ms=+1/2 and ms=-1/2.
- Wed Oct 16, 2019 9:03 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: What does the "x" indicate in (i.e.) the 2px state? [ENDORSED]
- Replies: 5
- Views: 368
Re: What does the "x" indicate in (i.e.) the 2px state? [ENDORSED]
I think x,y, and z correlate to the planes. He derived x by looking at the table from the slides.
- Wed Oct 16, 2019 4:23 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic radii
- Replies: 9
- Views: 503
Re: Atomic radii
Since the number of protons is increasing as you go right on the periodic table, the the effective nuclear charge increases and the nuclear pull is greater, thus resulting in a smaller radii.
- Wed Oct 16, 2019 3:31 pm
- Forum: Photoelectric Effect
- Topic: Particle vs. Wave Model
- Replies: 5
- Views: 238
Re: Particle vs. Wave Model
I think you are correct. Light is a wave because it demonstrates wave properties, but when considered as packets of photons, it own demonstrate particle-like properties. This is called wave-particle duality. It depends on the circumstances and what effects you're studying.
- Wed Oct 16, 2019 2:56 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: X Y and Z
- Replies: 7
- Views: 236
X Y and Z
I kind of have an idea of this, but can someone clarify how to determine the if an e- is in the X Y or Z plane? Thanks!
- Fri Oct 11, 2019 7:00 pm
- Forum: Limiting Reactant Calculations
- Topic: Exercise M.1
- Replies: 3
- Views: 406
Re: Exercise M.1
You would have to use stoichiometry. Set up a dimensional analysis to find the grams of hydrazine given 35g of ammonia. The solution to your dimensional analysis is the expected yield. Divide 25.2g (actual) by your solution (expected), then multiply by 100 to get your percent yield.
- Fri Oct 11, 2019 6:48 pm
- Forum: Einstein Equation
- Topic: E=hv
- Replies: 8
- Views: 224
Re: E=hv
I agree with the person above^. Also, if you ever forget, it's listed on top of the formula sheet we get during the test.
- Fri Oct 11, 2019 4:36 pm
- Forum: DeBroglie Equation
- Topic: Applying the DeBroglie Equation
- Replies: 6
- Views: 101
Re: Applying the DeBroglie Equation
The De Broglie Equation is used for any particle with momentum and has wavelike properties with a wavelength. Remember to not use EM equations for electrons!
- Fri Oct 11, 2019 4:34 pm
- Forum: Empirical & Molecular Formulas
- Topic: empirical = molecular?
- Replies: 15
- Views: 904
empirical = molecular?
If the molar mass of the empirical formula is the same as the one given in the question, is the molecular formula the same as the empirical? Or is there no molecular formula?
- Thu Oct 10, 2019 4:36 pm
- Forum: Empirical & Molecular Formulas
- Topic: Homework F9
- Replies: 4
- Views: 150
Homework F9
For F9, I understand all the steps until you multiply to get the molecular formula. How do you know to multiply 3? Do you just keep multiplying until you get whole coefficients?
- Thu Oct 03, 2019 10:40 pm
- Forum: Properties of Light
- Topic: Spectroscopy
- Replies: 4
- Views: 192
Re: Spectroscopy
Blue light has more energy because it has a shorter wavelength. Blue light has a higher frequency than red light.
- Thu Oct 03, 2019 10:20 pm
- Forum: Balancing Chemical Reactions
- Topic: Diatomic elements?
- Replies: 8
- Views: 318
Re: Diatomic elements?
I think that's just how they naturally occur. For example, you won't find just one singular oxygen atom, thus we make them diatomic in chemical equations.
- Thu Oct 03, 2019 11:56 am
- Forum: Empirical & Molecular Formulas
- Topic: Homework L39
- Replies: 5
- Views: 147
Re: Homework L39
The roman numeral in the parenthesis represent the charge since those metals have various charges. Since 02 is -4, tin must be +4 (IV).
- Thu Oct 03, 2019 11:32 am
- Forum: SI Units, Unit Conversions
- Topic: Sig Fig Mistakes
- Replies: 17
- Views: 810
Re: Sig Fig Mistakes
I agree with the post above. I remember from high school chem there were certain sig figs rules. For example, when multiplying or dividing, you answer with the least number of sig figs in the problem. For addition and subtraction, the answer can not contain more decimal places than the least precise...
- Wed Oct 02, 2019 5:35 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: HW problem G21
- Replies: 3
- Views: 165
Re: HW problem G21
Molarity is moles/volume of solution. So to use (b) as an example, first I would find the moles of S ions in 0.500g of K2S with stoichiometry --> 0.500g K2S x 1 mol K2S/110.26g x 1 mol S/ 1 mol K2S. Then convert 500. mL of volume to 0.5 L. Finally, divide the number of moles by volume to get M. Hope...