Search found 52 matches

by selatran1h
Sun Dec 08, 2019 1:20 am
Forum: Identifying Acidic & Basic Salts
Topic: Acidic Rain
Replies: 3
Views: 44

Re: Acidic Rain

Rain becomes acidic when water combines with pollutants in the air, such as SO2.
by selatran1h
Sun Dec 08, 2019 1:19 am
Forum: Biological Examples
Topic: Final
Replies: 6
Views: 58

Re: Final

The most important biological examples to know are DNA bonding, cisplatin, and hemoglobin and myoglobin.
by selatran1h
Sun Dec 08, 2019 1:17 am
Forum: Biological Examples
Topic: Cisplatin
Replies: 5
Views: 46

Re: Cisplatin

In the cis- molecule, the chlorines occur on the same side. In the trans- molecule, chlorine occurs on the opposite side
by selatran1h
Sun Dec 08, 2019 1:13 am
Forum: Naming
Topic: Ferrate and Cuprate? [ENDORSED]
Replies: 5
Views: 42

Re: Ferrate and Cuprate? [ENDORSED]

they are used when iron and copper occur as the anion in the coordination compound
by selatran1h
Sun Dec 08, 2019 1:11 am
Forum: Student Social/Study Group
Topic: Curve?
Replies: 10
Views: 485

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.
by selatran1h
Sun Dec 08, 2019 1:10 am
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 95
Views: 19706

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!
by selatran1h
Sun Dec 01, 2019 12:47 pm
Forum: Air Pollution & Acid Rain
Topic: Acid Rain
Replies: 15
Views: 1071

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.
by selatran1h
Sun Dec 01, 2019 12:45 pm
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted
Replies: 4
Views: 26

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.
by selatran1h
Sun Dec 01, 2019 12:42 pm
Forum: Identifying Acidic & Basic Salts
Topic: Final: Strong/ Weak Acids/Bases
Replies: 11
Views: 712

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.
by selatran1h
Sun Dec 01, 2019 12:40 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Base and Acid
Replies: 5
Views: 31

Re: Bronsted Base and Acid

Yes, because a Bronsted base accepts a proton while a Bronsted acid donates a proton.
by selatran1h
Sun Dec 01, 2019 12:39 pm
Forum: Lewis Acids & Bases
Topic: acid v. base?
Replies: 16
Views: 71

Re: acid v. base?

Lewis acids accept an electron pair while Lewis bases contain electron pairs.
by selatran1h
Thu Nov 21, 2019 11:14 pm
Forum: Dipole Moments
Topic: Elongated vs. Spherical Molecules
Replies: 3
Views: 31

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.
by selatran1h
Thu Nov 21, 2019 11:13 pm
Forum: Dipole Moments
Topic: Intermolecular Forces
Replies: 7
Views: 56

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.
by selatran1h
Thu Nov 21, 2019 11:10 pm
Forum: Biological Examples
Topic: VSEPR model
Replies: 2
Views: 186

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...
by selatran1h
Thu Nov 21, 2019 11:07 pm
Forum: Naming
Topic: Chloro vs Chlorito
Replies: 10
Views: 367

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.
by selatran1h
Thu Nov 21, 2019 11:05 pm
Forum: Naming
Topic: Cation/Anion
Replies: 7
Views: 218

Re: Cation/Anion

In chemical formulas, the cation is listed first and then the anion.
by selatran1h
Wed Nov 13, 2019 1:14 am
Forum: Coordinate Covalent Bonds
Topic: Electronegativity
Replies: 12
Views: 380

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.
by selatran1h
Wed Nov 13, 2019 1:10 am
Forum: Bond Lengths & Energies
Topic: Week 7 Homework
Replies: 15
Views: 147

Re: Week 7 Homework

I think we can turn in homework from section 3f on problems that were not covered by the midterm.
by selatran1h
Wed Nov 13, 2019 1:08 am
Forum: Electronegativity
Topic: Noble Gases
Replies: 19
Views: 149

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.
by selatran1h
Wed Nov 13, 2019 1:06 am
Forum: Electronegativity
Topic: Ionization Energy vs. Electronegativity
Replies: 9
Views: 44

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.
by selatran1h
Wed Nov 13, 2019 1:03 am
Forum: Coordinate Covalent Bonds
Topic: Determining bonds
Replies: 4
Views: 49

Re: Determining bonds

ionic bonds are between a nonmetal and metal while covalent bonds are between two nonmetals.
by selatran1h
Thu Nov 07, 2019 1:23 pm
Forum: Formal Charge and Oxidation Numbers
Topic: central atom
Replies: 21
Views: 103

Re: central atom

yes, ideally the central atom should have a formal charge of zero to create the most stable lewis structure.
by selatran1h
Thu Nov 07, 2019 1:22 pm
Forum: Ionic & Covalent Bonds
Topic: Names and chemical formulas
Replies: 5
Views: 29

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.
by selatran1h
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: 65

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...
by selatran1h
Thu Nov 07, 2019 1:16 pm
Forum: Lewis Structures
Topic: When to draw Resonance Structures
Replies: 14
Views: 81

Re: When to draw Resonance Structures

you should always draw resonance structures unless otherwise stated just to be safe.
by selatran1h
Thu Nov 07, 2019 1:15 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Shortcut for Formal Charge
Replies: 14
Views: 91

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
by selatran1h
Sun Nov 03, 2019 8:04 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: isoelectronic definition
Replies: 7
Views: 42

Re: isoelectronic definition

Isoelectronic refers to atoms and ions that have the same number of electrons and thus have the same electron configurations.
by selatran1h
Sun Nov 03, 2019 8:02 pm
Forum: Quantum Numbers and The H-Atom
Topic: Magnetic Quantum Number
Replies: 5
Views: 36

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.
by selatran1h
Sun Nov 03, 2019 8:01 pm
Forum: Resonance Structures
Topic: moving an electron
Replies: 4
Views: 28

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...
by selatran1h
Sun Nov 03, 2019 7:58 pm
Forum: Ionic & Covalent Bonds
Topic: middle atom
Replies: 13
Views: 60

Re: middle atom

The atom with the lowest ionization energy is usually the central atom.
by selatran1h
Sun Nov 03, 2019 7:57 pm
Forum: Ionic & Covalent Bonds
Topic: In what order do electrons get removed?
Replies: 7
Views: 8302

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.
by selatran1h
Mon Oct 21, 2019 9:13 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy
Replies: 8
Views: 71

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.
by selatran1h
Mon Oct 21, 2019 9:08 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radii
Replies: 10
Views: 67

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.
by selatran1h
Mon Oct 21, 2019 9:06 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic Atoms
Replies: 6
Views: 50

Re: Isoelectronic Atoms

Isoelectronic atoms are atoms and ions with the same number of electrons.
by selatran1h
Mon Oct 21, 2019 9:04 pm
Forum: Trends in The Periodic Table
Topic: Ionic radii
Replies: 11
Views: 67

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.
by selatran1h
Mon Oct 21, 2019 9:01 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 6
Views: 45

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.
by selatran1h
Tue Oct 15, 2019 8:23 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty Equation
Replies: 4
Views: 30

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.
by selatran1h
Tue Oct 15, 2019 8:12 pm
Forum: Properties of Light
Topic: Variables and what they mean
Replies: 9
Views: 67

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.
by selatran1h
Tue Oct 15, 2019 8:09 pm
Forum: Properties of Electrons
Topic: atomic spectroscopy
Replies: 5
Views: 31

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.
by selatran1h
Tue Oct 15, 2019 8:05 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 43
Views: 1958

Re: E=hv

E represents the energy of the photon while work represents the amount of energy it takes to remove the electron from the metal
by selatran1h
Tue Oct 15, 2019 8:03 pm
Forum: Administrative Questions and Class Announcements
Topic: How to find my posts
Replies: 48
Views: 37605

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.
by selatran1h
Tue Oct 08, 2019 3:39 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 132
Views: 76636

Re: Reading the textbook [ENDORSED]

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.
by selatran1h
Tue Oct 08, 2019 3:37 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 2731

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.
by selatran1h
Tue Oct 08, 2019 3:35 pm
Forum: Administrative Questions and Class Announcements
Topic: Formatting homework
Replies: 12
Views: 152

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.
by selatran1h
Tue Oct 08, 2019 3:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 1574

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.
by selatran1h
Tue Oct 08, 2019 3:32 pm
Forum: Significant Figures
Topic: Clarification with sig figs
Replies: 6
Views: 63

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.
by selatran1h
Tue Oct 08, 2019 3:31 pm
Forum: Limiting Reactant Calculations
Topic: Showing Work for Limiting Reactant Calculations on Tests [ENDORSED]
Replies: 68
Views: 1571

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.
by selatran1h
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: 114

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.
by selatran1h
Tue Oct 01, 2019 3:31 pm
Forum: Empirical & Molecular Formulas
Topic: 5 Homework Problems Due
Replies: 21
Views: 216

Re: 5 Homework Problems Due

The five homework problems can be from any of the sections and it is due this Friday, October 4.
by selatran1h
Tue Oct 01, 2019 3:24 pm
Forum: Balancing Chemical Reactions
Topic: State Symbols in Equations
Replies: 8
Views: 86

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.
by selatran1h
Tue Oct 01, 2019 3:22 pm
Forum: Molarity, Solutions, Dilutions
Topic: Symbol for Molarity
Replies: 7
Views: 76

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.
by selatran1h
Tue Oct 01, 2019 3:13 pm
Forum: Significant Figures
Topic: How to Write Out Final Answers
Replies: 5
Views: 54

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.

Go to advanced search