Search found 51 matches
- Sat Dec 07, 2019 10:39 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final exam
- Replies: 9
- Views: 600
Re: final exam
The final will be 8 questions. One of the questions should be a homework problem.
- Sat Dec 07, 2019 10:34 pm
- Forum: Naming
- Topic: Numerical Prefixes
- Replies: 2
- Views: 193
Re: Numerical Prefixes
You use bis, tris, and tetrakis if the compound is polydentate and the regular prefixes in any other instance.
- Sat Dec 07, 2019 10:29 pm
- Forum: Bronsted Acids & Bases
- Topic: Amphoteric
- Replies: 2
- Views: 218
Amphoteric
How can you tell if a molecule is amphoteric given its chemical formula?
- Sat Dec 07, 2019 10:26 pm
- Forum: Air Pollution & Acid Rain
- Topic: acid rain
- Replies: 5
- Views: 458
Re: acid rain
Know the reactions for carbonic acid and sulfuric acid.
- Sat Dec 07, 2019 10:21 pm
- Forum: Biological Examples
- Topic: Chemotherapy drugs
- Replies: 7
- Views: 473
Re: Chemotherapy drugs
Yes, cisplatin is the main compound. I believe we're supposed to know how it functions through its structure as well as possibly knowing how to draw it.
- Sat Dec 07, 2019 10:15 pm
- Forum: Bronsted Acids & Bases
- Topic: Strong Acids and Bases
- Replies: 2
- Views: 283
Re: Strong Acids and Bases
This would help because if you memorize the strong acids and bases, you can also determine whichever ones are weak. I would recommend it if you haven't already.
- Sun Dec 01, 2019 4:14 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pH Scale is broken?
- Replies: 6
- Views: 525
Re: pH Scale is broken?
Superacids and superbases were briefly mentioned in class, but I believe we don't accommodate for them because they are extreme cases. For the most part, acids and bases should fall within the 0-14 pH scale.
- Sun Dec 01, 2019 4:10 pm
- Forum: Student Social/Study Group
- Topic: readings
- Replies: 13
- Views: 874
Re: readings
Professor Lavelle seems to expect us to read the sections corresponding to the current homework of the week. I feel like if you understand all of the homework problems though, you should be fine. Just tailor your studying to your weaknesses and focus on what you feel you don't understand.
- Sun Dec 01, 2019 4:05 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Base and Acid
- Replies: 5
- Views: 395
Re: Bronsted Base and Acid
Yes, a Bronsted acid is the proton donor and a Bronsted base is the proton acceptor. This is based on the Bronsted-Lowry definition of acids and bases.
- Sun Dec 01, 2019 4:01 pm
- Forum: Lewis Acids & Bases
- Topic: Define Acid and Base
- Replies: 7
- Views: 752
Re: Define Acid and Base
The definition of acid and base depends on which definition you're referring to. Solely considering the Lewis acid and base definition, an acid is an electron acceptor and a base is an electron donor.
- Sat Nov 30, 2019 12:35 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Difference between Arrhenius, Bronsted, and Lewis
- Replies: 5
- Views: 8488
Difference between Arrhenius, Bronsted, and Lewis
What are the differences between Arrhenius, Bronsted, and Lewis acids and bases?
- Sun Nov 24, 2019 11:12 pm
- Forum: Dipole Moments
- Topic: benzene polarity
- Replies: 4
- Views: 441
Re: benzene polarity
Benzene is nonpolar. Search up the shape and you'll see the symmetrical structure.
- Sun Nov 24, 2019 11:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: final exam
- Replies: 9
- Views: 600
Re: final exam
The number of questions hasn't been given yet, but the length of the final is around 3 hours.
- Sun Nov 24, 2019 10:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Drawing molecules
- Replies: 7
- Views: 458
Re: Drawing molecules
Drawing line structures most likely won't be covered in our class. It's mainly for ochem.
- Sun Nov 24, 2019 10:19 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: AXE Format
- Replies: 34
- Views: 1085
Re: AXE Format
Simply write the letter X or E for a subscript of 1. In addition, if it's a subscript of 0, don't write the letter.
- Sun Nov 24, 2019 10:08 pm
- Forum: Biological Examples
- Topic: Cisplatin [ENDORSED]
- Replies: 19
- Views: 1249
Re: Cisplatin [ENDORSED]
It is used to stop cell division for cancer treatment, but it also stops healthy cell division.
- Sun Nov 17, 2019 11:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Resonance and VSEPR
- Replies: 9
- Views: 535
Re: Resonance and VSEPR
They aren't. VSEPR is only determined by the regions of electron density and amount of bonding/lone pairs.
- Sun Nov 17, 2019 11:32 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizable vs polarizing power
- Replies: 6
- Views: 438
Re: Polarizable vs polarizing power
These terms are used to describe the characteristics of ions. Polarizability is generally associated with anions and polarizing power with cations, but this isn't a steadfast rule by any means.
- Sun Nov 17, 2019 11:26 pm
- Forum: Bond Lengths & Energies
- Topic: Test 2 Topics
- Replies: 40
- Views: 2061
Re: Test 2 Topics
The topics we've covered so far since the midterm are VSEPR, bond angles, and intermolecular forces. We will also be tested on what we learn Monday which will include pi and sigma bonds along with other material.
- Sun Nov 17, 2019 11:22 pm
- Forum: Trends in The Periodic Table
- Topic: electron affinity
- Replies: 7
- Views: 648
Re: electron affinity
Electron affinity has a similar trend to electronegativity and ionization energy. (it increases going up and to the right)
- Sun Nov 17, 2019 11:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Naming the Molecular Shapes
- Replies: 7
- Views: 473
Re: Naming the Molecular Shapes
Visualizing the shapes in my head helps me remember them because the names of the shapes are based off of how they're formed in real life i.e. trigonal planar is a flat triangle or seesaw is shaped like a seesaw.
- Mon Nov 11, 2019 10:34 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: london forces
- Replies: 6
- Views: 270
Re: london forces
Yes, all molecules have london dispersion forces. However, the more electrons a molecule has, the stronger the forces are.
- Mon Nov 11, 2019 10:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: central atoms
- Replies: 7
- Views: 333
Re: central atoms
The central atom is typically determined by whichever atom has the lowest electronegativity. Aside from this, the atom which is alone or has the lowest quantity is usually in the center.
- Mon Nov 11, 2019 10:24 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge
- Replies: 16
- Views: 855
Re: Formal charge
Getting close to 0 is ideal, but the "next best" option would be giving a more electronegative atom like oxygen a negative charge.
- Mon Nov 11, 2019 10:23 pm
- Forum: Lewis Structures
- Topic: Test Questions regarding Electronegativity
- Replies: 2
- Views: 206
Re: Test Questions regarding Electronegativity
I believe so because we used a chart to determine electronegativity difference in lecture. Generally, anything we need should be provided for us on the test.
- Mon Nov 11, 2019 10:21 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing Power
- Replies: 6
- Views: 1231
Re: Polarizing Power
A cation's ability to distort an anion's electron cloud is polarizing power. Polarizability is the tendency of a cation to be affected by an anion's polarizing power.
- Sun Nov 03, 2019 8:39 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 4s or 3d first?
- Replies: 14
- Views: 787
Re: 4s or 3d first?
Lavelle wants us to write 3d before 4s, but I in general it isn't incorrect to write 4s before 3d. I think you should maintain class expectations for the test though.
- Sun Nov 03, 2019 8:36 pm
- Forum: *Black Body Radiation
- Topic: Info for Midterm
- Replies: 13
- Views: 1046
Re: Info for Midterm
He mentioned this briefly, but stated it will not be tested in this class.
- Sun Nov 03, 2019 8:32 pm
- Forum: Resonance Structures
- Topic: Do we always need to draw resonance?
- Replies: 1
- Views: 109
Do we always need to draw resonance?
If a molecule has resonance structures, but they are not explicitly asked for in the problem, do we still need to draw them?
- Sun Nov 03, 2019 8:31 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 1
- Views: 153
Resonance Structures
How do we determine if a molecule has resonance structures?
- Sun Nov 03, 2019 8:13 pm
- Forum: Octet Exceptions
- Topic: Elements with Exceptions to Octet Rule
- Replies: 1
- Views: 106
Elements with Exceptions to Octet Rule
Which elements have exceptions to the octet rule? i.e. Phosphorous which can have an expanded octet or Boron which doesn't need a full octet
- Sun Oct 27, 2019 8:57 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonds
- Replies: 14
- Views: 956
Re: Covalent Bonds
Yes, it's only between nonmetals. If other metals were involved, it would probably be a different type of bond.
- Sun Oct 27, 2019 8:47 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 3
- Views: 173
Re: Resonance Structures
Resonant structures allow for greater accuracy when modeling certain molecules because they show us that those molecules have delocalized electrons which can move around. You don't "need" to move the bond, but it is good to know that the bond can move.
- Sun Oct 27, 2019 8:40 pm
- Forum: Bond Lengths & Energies
- Topic: bond lengths for single or double bonds
- Replies: 7
- Views: 412
Re: bond lengths for single or double bonds
The stronger the bond, the shorter the bond length, so double bonds will be shorter than single bonds.
- Sun Oct 27, 2019 6:03 pm
- Forum: Properties of Electrons
- Topic: Determining Number of Valence Electrons
- Replies: 2
- Views: 172
Determining Number of Valence Electrons
Are we expected to know the number of valence electrons in transition metals? It was a homework problem, so I wanted to make sure. The problem stated to identify the number of valence electrons (including d electrons) in magnesium. If we are expected to know this, how would we determine the number?
- Sun Oct 27, 2019 1:26 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration Special Cases
- Replies: 6
- Views: 465
Electron Configuration Special Cases
Aside from chromium and copper, are there any other elements that have "exceptions" in electron configuration?
- Mon Oct 21, 2019 2:27 am
- Forum: Trends in The Periodic Table
- Topic: Difference between electron affinity and electronegativity?
- Replies: 3
- Views: 122
Re: Difference between electron affinity and electronegativity?
Electron affinity is the likelihood of an atom gaining an electron, while electronegativity is the tendency of an atom to attract electrons.
- Mon Oct 21, 2019 2:04 am
- Forum: Photoelectric Effect
- Topic: Threshold Energy
- Replies: 7
- Views: 491
Re: Threshold Energy
I'm also confused how an electron is "ejected" with no kinetic energy. Could someone clarify further?
- Mon Oct 21, 2019 1:15 am
- Forum: Properties of Light
- Topic: Balmer and Lyman Series
- Replies: 5
- Views: 212
Re: Balmer and Lyman Series
The electron moving from n1 to n2 is the process of it being excited. The Lyman and Balmer series describe the electron as it is falling back down to lower energy levels from its excited state.
- Mon Oct 21, 2019 12:55 am
- Forum: Administrative Questions and Class Announcements
- Topic: Periodic Table on the Test
- Replies: 7
- Views: 422
Re: Periodic Table on the Test
You're provided a periodic table, along with an equation sheet, so I believe you should use those so that your answers will be more accurate. (:
- Mon Oct 21, 2019 12:42 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: What's the right equation?
- Replies: 7
- Views: 232
Re: What's the right equation?
If you're referring to the Heisenberg Uncertainty Equation, it should be the first one.
- Mon Oct 14, 2019 9:22 am
- Forum: Properties of Light
- Topic: Wave Frequency
- Replies: 9
- Views: 460
Re: Wave Frequency
I also believe it is the amount of energy per photon because photons are essentially discrete packets of energy in the form of waves.
- Mon Oct 14, 2019 9:12 am
- Forum: Properties of Light
- Topic: Quantum Levels
- Replies: 1
- Views: 180
Re: Quantum Levels
If you're asking whether or not a quanta can have a value other than a whole number then this is not possible. They can, however, have values that continue to infinity as long as they're whole.
- Mon Oct 14, 2019 8:44 am
- Forum: Properties of Light
- Topic: Memorizing Values for Tests
- Replies: 3
- Views: 172
Re: Memorizing Values for Tests
The values will be provided for you on the formula sheet, so you don't have to memorize them. However, I would try to memorize ones that reoccur often like Planck's constant.
- Mon Oct 14, 2019 8:34 am
- Forum: Student Social/Study Group
- Topic: Best Sessions
- Replies: 12
- Views: 427
Re: Best Sessions
The step-up sessions help me a lot because they go at a slower pace. In workshops, you're expected to know the material.
- Sun Oct 06, 2019 11:56 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Theoretical vs. Actual Yield
- Replies: 38
- Views: 13868
Re: Theoretical vs. Actual Yield
The actual yield is generally not equal to the theoretical yield because of impurities during experimentation or other factors such as solution staying on the sides of the beaker. In order for the actual yield to equal the theoretical yield, the experiment would need to be executed perfectly.
- Sun Oct 06, 2019 11:49 pm
- Forum: Balancing Chemical Reactions
- Topic: Naming/Polyatomic ions
- Replies: 4
- Views: 197
Re: Naming/Polyatomic ions
I was told by my TA that it would definitely be useful to memorize the polyatomic ions, but I don't think they'll be particularly relevant to the test.
- Sun Oct 06, 2019 11:46 pm
- Forum: Limiting Reactant Calculations
- Topic: Question about Calculating Limiting Reactants
- Replies: 5
- Views: 218
Question about Calculating Limiting Reactants
Are you allowed to simply calculate the moles of each reactant and then compare them to find the limiting reagent?
- Sun Oct 06, 2019 3:18 pm
- Forum: Significant Figures
- Topic: Inaccurate Answer
- Replies: 4
- Views: 198
Inaccurate Answer
I don't know what my problem is, but I seem to always be slightly off the answer. Could I get some advice? For example, I'll calculate the molar mass of C6H12O6 and get 180.14 g/mol rather than 180.15 g/mol like the book says. The way I've been doing it is I keep the values of the atomic masses the ...
- Sat Oct 05, 2019 6:15 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Atoms, Molecules, and Formula Units
- Replies: 4
- Views: 298
Atoms, Molecules, and Formula Units
How is it possible that Avogadro's Constant can be used to find atoms, molecules, and formula units? Does whichever item you're finding depend on the substance involved in the problem?
- Fri Oct 04, 2019 12:40 pm
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 334137
Re: Final Jitters
I think many people experience test anxiety and that's okay! I usually cope by doing something I enjoy before a test such as playing piano or reading a book. I'm still a first year though so my experience is also limited. I think the best strategy is to simply be prepared. If you feel ready, that sh...