Search found 52 matches
- Sun Dec 08, 2019 1:20 am
- Forum: Identifying Acidic & Basic Salts
- Topic: Acidic Rain
- Replies: 3
- Views: 382
Re: Acidic Rain
Rain becomes acidic when water combines with pollutants in the air, such as SO2.
- Sun Dec 08, 2019 1:19 am
- Forum: Biological Examples
- Topic: Final
- Replies: 6
- Views: 510
Re: Final
The most important biological examples to know are DNA bonding, cisplatin, and hemoglobin and myoglobin.
- Sun Dec 08, 2019 1:17 am
- Forum: Biological Examples
- Topic: Cisplatin
- Replies: 5
- Views: 527
Re: Cisplatin
In the cis- molecule, the chlorines occur on the same side. In the trans- molecule, chlorine occurs on the opposite side
- Sun Dec 08, 2019 1:13 am
- Forum: Naming
- Topic: Ferrate and Cuprate? [ENDORSED]
- Replies: 5
- Views: 542
Re: Ferrate and Cuprate? [ENDORSED]
they are used when iron and copper occur as the anion in the coordination compound
- Sun Dec 08, 2019 1:11 am
- Forum: Student Social/Study Group
- Topic: Curve?
- Replies: 50
- Views: 6331
Re: Curve?
The class is technically not curved, but rather scale based. So depending on what the overall class average is, the scale will be shifted and grades will be assigned accordingly I'm pretty sure.
- Sun Dec 08, 2019 1:10 am
- Forum: Student Social/Study Group
- Topic: Final Jitters
- Replies: 457
- Views: 357647
Re: Final Jitters
Go to the final early so you aren't too flustered. If you have trouble with a question, don't sweat it and just come back to it later. Focus on the test itself rather than the final outcome and just try your best!
- Sun Dec 01, 2019 12:47 pm
- Forum: Air Pollution & Acid Rain
- Topic: Acid Rain
- Replies: 24
- Views: 3931
Re: Acid Rain
Acid rain is formed when pollutants in the air such as sulfur dioxide combine with water, causing the pH of rain to decrease and become more acidic.
- Sun Dec 01, 2019 12:45 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis vs Bronsted
- Replies: 4
- Views: 317
Re: Lewis vs Bronsted
yes, they are essentially the same, just worded differently. for example, a Lewis base and a Bronsted base are the same. this is because when an acid gains a proton, it loses a lone pair.
- Sun Dec 01, 2019 12:42 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Final: Strong/ Weak Acids/Bases
- Replies: 11
- Views: 1526
Re: Final: Strong/ Weak Acids/Bases
Most likely, we will only need to know strong acids and bases. But just to be safe, you could also memorize salts but it is not completely necessary.
- Sun Dec 01, 2019 12:40 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Base and Acid
- Replies: 5
- Views: 423
Re: Bronsted Base and Acid
Yes, because a Bronsted base accepts a proton while a Bronsted acid donates a proton.
- Sun Dec 01, 2019 12:39 pm
- Forum: Lewis Acids & Bases
- Topic: acid v. base?
- Replies: 16
- Views: 957
Re: acid v. base?
Lewis acids accept an electron pair while Lewis bases contain electron pairs.
- Thu Nov 21, 2019 11:14 pm
- Forum: Dipole Moments
- Topic: Elongated vs. Spherical Molecules
- Replies: 3
- Views: 290
Re: Elongated vs. Spherical Molecules
It is best to look at the formula and draw the lewis structure. Compounds with longer formulas tend to be elongated.
- Thu Nov 21, 2019 11:13 pm
- Forum: Dipole Moments
- Topic: Intermolecular Forces
- Replies: 7
- Views: 476
Re: Intermolecular Forces
To determine intermolecular forces, you have to look at what elements are involved, how they are bonded, and their polarity. If there is an H in the compound, it is likely there is hydrogen bonding. If the atoms are non polar, it is likely the forces are London dispersion.
- Thu Nov 21, 2019 11:10 pm
- Forum: Biological Examples
- Topic: VSEPR model
- Replies: 2
- Views: 2546
Re: VSEPR model
VSEPR has to do with the molecular shape, so how the other atoms are positioned around the central atom and how the lone pairs use repulsion to create bond angles with the atoms. Hybridization has to do with the actual orbitals of each of the atoms, usually the central atom. Hybridization is very cl...
- Thu Nov 21, 2019 11:07 pm
- Forum: Naming
- Topic: Chloro vs Chlorito
- Replies: 10
- Views: 1240
Re: Chloro vs Chlorito
I believe both are acceptable, but I would stick with chloro like in the lecture notes just to be sure since that is the convention used by the professor.
- Thu Nov 21, 2019 11:05 pm
- Forum: Naming
- Topic: Cation/Anion
- Replies: 7
- Views: 860
Re: Cation/Anion
In chemical formulas, the cation is listed first and then the anion.
- Wed Nov 13, 2019 1:14 am
- Forum: Coordinate Covalent Bonds
- Topic: Electronegativity
- Replies: 12
- Views: 1739
Re: Electronegativity
Fluorine has the highest electronegativity since it is the smallest of the halogens atoms. Bigger halogens have more electrons and thus have more electron shielding, so the force of attraction for another electron is not as high as fluorine.
- Wed Nov 13, 2019 1:10 am
- Forum: Bond Lengths & Energies
- Topic: Week 7 Homework
- Replies: 15
- Views: 860
Re: Week 7 Homework
I think we can turn in homework from section 3f on problems that were not covered by the midterm.
- Wed Nov 13, 2019 1:08 am
- Forum: Electronegativity
- Topic: Noble Gases
- Replies: 40
- Views: 12756
Re: Noble Gases
Since noble gases already have a full octet, they do not attract electrons. So , they are not included in electronegativity and fluorine is the most electronegative element on the periodic table.
- Wed Nov 13, 2019 1:06 am
- Forum: Electronegativity
- Topic: Ionization Energy vs. Electronegativity
- Replies: 9
- Views: 9846
Re: Ionization Energy vs. Electronegativity
Ionization energy is the amount of energy it takes to remove an electron from an atom while electronegativity is the atom's ability to attract an electron.
- Wed Nov 13, 2019 1:03 am
- Forum: Coordinate Covalent Bonds
- Topic: Determining bonds
- Replies: 4
- Views: 478
Re: Determining bonds
ionic bonds are between a nonmetal and metal while covalent bonds are between two nonmetals.
- Thu Nov 07, 2019 1:23 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: central atom
- Replies: 21
- Views: 1031
Re: central atom
yes, ideally the central atom should have a formal charge of zero to create the most stable lewis structure.
- Thu Nov 07, 2019 1:22 pm
- Forum: Ionic & Covalent Bonds
- Topic: Names and chemical formulas
- Replies: 5
- Views: 448
Re: Names and chemical formulas
most questions on the exams will give the chemical formula. however, if you would like to memorize some of the chemical formulas, there is a chart in the fundamentals section of the textbook of the main ones you should know.
- Thu Nov 07, 2019 1:19 pm
- Forum: Ionic & Covalent Bonds
- Topic: Why is the ionization energy of nitrogen higher than that of oxygen's?
- Replies: 11
- Views: 1002
Re: Why is the ionization energy of nitrogen higher than that of oxygen's?
nitrogen has all three of its sub shells filled while oxygen has unpaired electrons in its sub shells. this makes nitrogen more stable compared to oxygen. it is easier to remove these unpaired electrons from oxygen, giving it a lower ionization energy since it does not require as much energy as it w...
- Thu Nov 07, 2019 1:16 pm
- Forum: Lewis Structures
- Topic: When to draw Resonance Structures
- Replies: 14
- Views: 1007
Re: When to draw Resonance Structures
you should always draw resonance structures unless otherwise stated just to be safe.
- Thu Nov 07, 2019 1:15 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Shortcut for Formal Charge
- Replies: 19
- Views: 1666
Re: Shortcut for Formal Charge
to calculate formal charge, add up the number of electrons surrounding the atom in the lewis structure with the number of bonds attached to it. subtract this value from the number of valence electrons the original atom has to find the formal charge
- Sun Nov 03, 2019 8:04 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: isoelectronic definition
- Replies: 7
- Views: 273
Re: isoelectronic definition
Isoelectronic refers to atoms and ions that have the same number of electrons and thus have the same electron configurations.
- Sun Nov 03, 2019 8:02 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Magnetic Quantum Number
- Replies: 5
- Views: 172
Re: Magnetic Quantum Number
The 5 just means that there are 5 total values for the magnetic quantum number, so you would still have to write out all of the actual values.
- Sun Nov 03, 2019 8:01 pm
- Forum: Resonance Structures
- Topic: moving an electron
- Replies: 4
- Views: 264
Re: moving an electron
Resonance structures involve moving, adding, or subtracting bonds from a structure between the various atoms. This is because multiple forms of the actual structure of the compound exists since electrons are never only in one place and are constantly moving. Thus, resonance structures imply moving e...
- Sun Nov 03, 2019 7:58 pm
- Forum: Ionic & Covalent Bonds
- Topic: middle atom
- Replies: 13
- Views: 545
Re: middle atom
The atom with the lowest ionization energy is usually the central atom.
- Sun Nov 03, 2019 7:57 pm
- Forum: Ionic & Covalent Bonds
- Topic: In what order do electrons get removed?
- Replies: 7
- Views: 35733
Re: In what order do electrons get removed?
Valence electrons are removed first since they are in the outermost orbital of the atom and are thus the easiest to remove. Then, the order continues going inward.
- Mon Oct 21, 2019 9:13 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy
- Replies: 8
- Views: 326
Re: Ionization Energy
Once one electron is removed, the effective nuclear charge increases, making the remaining valence electrons pulled closer to the nucleus. This makes it more difficult for the second or third electron to be removed.
- Mon Oct 21, 2019 9:08 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic Radii
- Replies: 10
- Views: 591
Re: Atomic Radii
Atomic radii decreases across a period since electrons are located in the same shell and the increasing number of protons increases the nuclear charge, pulling the electrons towards the nucleus to decrease the radius.
- Mon Oct 21, 2019 9:06 pm
- Forum: Trends in The Periodic Table
- Topic: Isoelectronic Atoms
- Replies: 6
- Views: 447
Re: Isoelectronic Atoms
Isoelectronic atoms are atoms and ions with the same number of electrons.
- Mon Oct 21, 2019 9:04 pm
- Forum: Trends in The Periodic Table
- Topic: Ionic radii
- Replies: 11
- Views: 369
Re: Ionic radii
Ionic radii increase down a group due to the fact that, since electrons are added to valence shells, these additional shells are further from the nucleus, increasing the ionic radius of the atom.
- Mon Oct 21, 2019 9:01 pm
- Forum: Trends in The Periodic Table
- Topic: Electron Affinity
- Replies: 6
- Views: 310
Re: Electron Affinity
Electron affinity is the energy released when an electron is added to the gas phase of an atom. It increases up a group and across a period from left to right. The elements with the highest electron affinities are located in the top right corner of the periodic table in group 17.
- Tue Oct 15, 2019 8:23 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Uncertainty Equation
- Replies: 4
- Views: 167
Re: Uncertainty Equation
Yes, the more you know about the position, the less you will know about the momentum. Based on the uncertainty equation, you can see that the two are inversely related.
- Tue Oct 15, 2019 8:12 pm
- Forum: Properties of Light
- Topic: Variables and what they mean
- Replies: 9
- Views: 508
Re: Variables and what they mean
The greek letter lambda stands for wavelength while the v is the lowercase greek letter nu which stands for frequency.
- Tue Oct 15, 2019 8:09 pm
- Forum: Properties of Electrons
- Topic: atomic spectroscopy
- Replies: 5
- Views: 409
Re: atomic spectroscopy
Yes, atomic spectroscopy can be used to identify elements. In each element, electrons are at varying energy levels which can be used to identify the different elements.
- Tue Oct 15, 2019 8:05 pm
- Forum: Einstein Equation
- Topic: E=hv [ENDORSED]
- Replies: 52
- Views: 18403
Re: E=hv [ENDORSED]
E represents the energy of the photon while work represents the amount of energy it takes to remove the electron from the metal
- Tue Oct 15, 2019 8:03 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How to find my posts
- Replies: 163
- Views: 166194
Re: How to find my posts
in the left hand corner there is a link called quick links. click on the tab that says your posts and you should be able to see your past posts.
- Tue Oct 08, 2019 3:39 pm
- Forum: Ideal Gases
- Topic: Reading the textbook
- Replies: 262
- Views: 150021
Re: Reading the textbook
I personally think reading the textbook helps a lot since it helps to clarify certain conceptual topics that are difficult or were not covered as much in lecture. The textbook also has a lot of sample problems that are helpful when doing homework.
- Tue Oct 08, 2019 3:37 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Test 1 [ENDORSED]
- Replies: 107
- Views: 20486
Re: Test 1 [ENDORSED]
No, we do not need a blue book for the test. All materials, including a periodic table and constants sheet with equations, will be provided.
- Tue Oct 08, 2019 3:35 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Formatting homework
- Replies: 12
- Views: 656
Re: Formatting homework
On lined paper, clearly write out what questions you are doing and make sure that you include your name, discussion section number, and ID number in the header.
- Tue Oct 08, 2019 3:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 7622
Re: Week 2 Homework Problems [ENDORSED]
We are allowed to do our homework either on quantum or on the review sections as long as it is five problems total.
- Tue Oct 08, 2019 3:32 pm
- Forum: Significant Figures
- Topic: Clarification with sig figs
- Replies: 6
- Views: 224
Re: Clarification with sig figs
Do not round until the final answer, which should be in 3 significant figures. During the calculation process, use the exact measurements stated by your calculator.
- Tue Oct 08, 2019 3:31 pm
- Forum: Limiting Reactant Calculations
- Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
- Replies: 68
- Views: 6919
Re: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Yes, as long as you follow all of the steps to show the limiting reactant calculations you should receive full credit.
- Tue Oct 01, 2019 3:34 pm
- Forum: Balancing Chemical Reactions
- Topic: Tips on what number to multiply the entire equation if needed
- Replies: 8
- Views: 1679
Re: Tips on what number to multiply the entire equation if needed
The objective is to make all of the stoichiometric coefficients into integers. If they are written in fractions, then multiply the entire equation by the least common denominator to both sides.
- Tue Oct 01, 2019 3:31 pm
- Forum: Empirical & Molecular Formulas
- Topic: 5 Homework Problems Due
- Replies: 21
- Views: 924
Re: 5 Homework Problems Due
The five homework problems can be from any of the sections and it is due this Friday, October 4.
- Tue Oct 01, 2019 3:24 pm
- Forum: Balancing Chemical Reactions
- Topic: State Symbols in Equations
- Replies: 8
- Views: 790
Re: State Symbols in Equations
Yes, I would recommend writing down the states of each reactant and products as it helps you visualize what is actually occurring in the reaction. This will become more beneficial once we get to more complex reactions such as acids and bases.
- Tue Oct 01, 2019 3:22 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Symbol for Molarity
- Replies: 7
- Views: 774
Re: Symbol for Molarity
The symbol for molarity is M and the units are mol/L while the units for molar mass are grams/mol.
- Tue Oct 01, 2019 3:13 pm
- Forum: Significant Figures
- Topic: How to Write Out Final Answers
- Replies: 5
- Views: 316
Re: How to Write Out Final Answers
If not specified, it is fine to leave the answer in scientific notation as in liters with the correct amount of significant figures. However, for the sake of an experiment, it would be optimal to convert it to milliliters, as it is easier to measure and will thus minimize experimental error.