## Search found 56 matches

Sun Jan 17, 2021 4:24 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: q vs k
Replies: 62
Views: 161

### Re: q vs k

Q is the reaction quotient and can be used to figure out which direction the reaction will shift in order to reach equilibrium. K > Q: reaction proceeds forward, R --> P. K < Q: reaction proceeds in reverse direction, P --> R. Q = K: system is at equilibrium, no shift to either left or right Thank ...
Sun Jan 17, 2021 4:21 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Using Ka vs Kb
Replies: 8
Views: 31

### Re: Using Ka vs Kb

Hannah Biju 1E wrote:If there is formation of an acid (H3O+), then you should use Ka. If there is formation of a base (OH-), then you should use Kb.

Sun Jan 17, 2021 4:18 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc vs. Q
Replies: 5
Views: 15

### Re: Kc vs. Q

Q and K don't represent the same number. K is a constant that stays the same (unless you change the temp) and shows you the ratio of the concentration of products over the concentration of reactants. Q actually can help you determine if a reaction is at equilibrium and if it isn't how it will shift...
Sun Jan 17, 2021 4:16 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Replies: 7
Views: 19

I'm also struggling on the application of the quadratic equation. I'm not sure how to use it correctly or when to use it :,)
Sun Jan 17, 2021 4:14 am
Forum: Ideal Gases
Topic: Gas constant R
Replies: 26
Views: 88

### Re: Gas constant R

As many before me have said, it is a constant :)
R = 8.3144598 J/mol·K
Sun Dec 13, 2020 12:54 am
Forum: Dipole Moments
Topic: Hydrogen Bonding
Replies: 6
Views: 48

### Re: Hydrogen Bonding

Mohamed Mido wrote:Any NOF atom that has lone pairs can H-bond. Alos all hydrogens bonded to NOF can H-Bond. It can be tricky because Hydrogen atoms that are bonded to Carbon can't H-bond, but NOF atoms bonded to Carbon can, so you'll have to remember that.

Thank you for this!
Sun Dec 13, 2020 12:52 am
Forum: Bronsted Acids & Bases
Topic: Sapling #12
Replies: 6
Views: 40

### Re: Sapling #12

I remember hearing that since O is pulling towards H, it means a weak bond. As you mentioned, their electronegativity is involved :)
Sun Dec 13, 2020 12:50 am
Forum: Trends in The Periodic Table
Topic: O versus N Ionization Energy
Replies: 5
Views: 37

### Re: O versus N Ionization Energy

I myself am not entirely sure. I just know it has something to do with their electron configuration. Thank you for asking this question since I was also wondering the same thing!
Fri Dec 11, 2020 3:20 am
Forum: Polyprotic Acids & Bases
Topic: How can you tell
Replies: 18
Views: 368

### Re: How can you tell

The anion has to have more than one h atom :)
Fri Dec 11, 2020 3:09 am
Forum: Resonance Structures
Topic: Resonance Hyrbid
Replies: 11
Views: 84

### Re: Resonance Hyrbid

this is a bit of a dumb question but what exactly do we mean when we say something is delocalized? i've seen it in a couple of posts and im a bit confused as to what that exactly means Hi the term delocalized is used to refer to an electrons activity! so if it is delocalized, it means that it is no...
Sun Dec 06, 2020 2:11 am
Forum: Bronsted Acids & Bases
Topic: neutralization
Replies: 3
Views: 39

### Re: neutralization

connie ma 2B wrote:to clarify what someone else said, complete neutralization only occurs if its a strong acid reacting with a strong base. if its strong/weak or weak/weak then i dont think complete neutralization occurs.

Thank you for this! I found it much easier to understand.
Sun Dec 06, 2020 2:09 am
Forum: Hybridization
Topic: Unhybridized Orbitals in Relation to Hybridized Orbitals
Replies: 4
Views: 54

### Re: Unhybridized Orbitals in Relation to Hybridized Orbitals

Well it depends. If you remember earlier in the quarter, when we first reviewed unhybridized orbitals, we learned that p orbitals have 3 different orientations-- px, py, and pz. Each p orbital was on a different axis. The reason the unhybridized p orbital was perpendicular rather than in plane was ...
Sun Dec 06, 2020 2:03 am
Forum: Resonance Structures
Topic: Stability
Replies: 13
Views: 104

### Re: Stability

Because electrons are delocalized (meaning they are not bound to just one location, for example, a double bond), this makes the molecule more stable. Resonance structures allow for different bond configurations between atoms in a molecule. The electrons have "different options" in terms o...
Sun Dec 06, 2020 2:02 am
Forum: Significant Figures
Topic: When should I start looking at sig figs?
Replies: 31
Views: 231

### Re: When should I start looking at sig figs?

I always keep as many decimal points while I'm working on the math and once I've got my final answer, I focus on sig figs :)
Sun Dec 06, 2020 1:53 am
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bonds and Covalent Bonds
Replies: 7
Views: 70

### Re: Coordinate Covalent Bonds and Covalent Bonds

coordinate covalent: 1 atom donates BOTH electrons

regular covalent: 2 atoms share 1 electron
Fri Nov 27, 2020 9:03 pm
Forum: Lewis Structures
Topic: Ring structures
Replies: 4
Views: 47

### Re: Ring structures

CesarLec1 wrote:I believe that for our purposes, when we see a molecule with 6 carbon atoms, it will most likely be in a ring structure

Thank you for explaining this, I did not know that was the case! :)
Fri Nov 27, 2020 8:59 pm
Forum: Trends in The Periodic Table
Replies: 7
Views: 103

Hi! As the charge become more positive, the ionic radius usually decreases. This is because there are fewer electrons in the atom. As there are fewer electrons, the electrons are pulled closer to the nucleus of the atom. When an ion is more negative, the ionic radius increases because the electrons...
Fri Nov 27, 2020 8:54 pm
Forum: Empirical & Molecular Formulas
Topic: Periodic Table and Calculations
Replies: 20
Views: 158

### Re: Periodic Table and Calculations

jordanginyard_ wrote:What is a good calculator to use for chemistry? what's a good periodic table because sometimes I get the problems wrong with the numbers that are used on the periodic table?

I currently use the ti-84 just because it's the one calculator I'm familiar with! :)
Fri Nov 27, 2020 8:47 pm
Forum: Octet Exceptions
Replies: 7
Views: 51

VSU_2G wrote:As others have said, I believe they're the same thing! Free radicals are involved in oxidizing elements, and I feel like an element with an odd number of electrons would want electrons from other substances, so I believe they are interchangeable terms.

Thanks for the clarification!
Fri Nov 27, 2020 8:46 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: ionic liquids
Replies: 7
Views: 87

### Re: ionic liquids

It's a salt in it's liquid state and as many have said, it has a low melting point :)
Sat Nov 21, 2020 2:21 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Determining Polarity
Replies: 6
Views: 51

### Re: Determining Polarity

I use the electronegativity trend and shape to help me find out if the molecule is polar. So, if a molecule is polar, that means one side is hogging the electrons more than the other. So if more electronegative atoms are on one side of the molecule, then it is polar. If the electronegative molecule...
Sat Nov 21, 2020 2:18 am
Forum: Sigma & Pi Bonds
Topic: Hybridization
Replies: 7
Views: 91

### Re: Hybridization

Is there a specific benefit for hybridization? Why does it occur in the first place? Hybridization occurs to fix the imbalance in the energy levels of the electrons when an atom bonds using electrons from different orbitals. This will result in a more stable molecule! Thank you for clarifying! I di...
Sat Nov 21, 2020 2:17 am
Forum: Ionic & Covalent Bonds
Topic: Covalent Character
Replies: 33
Views: 200

### Re: Covalent Character

I just remember that the smaller the difference in electronegativity, the more covalent it is! :)
Sat Nov 21, 2020 2:16 am
Forum: Lewis Structures
Topic: Identifying Lewis Acids and Bases
Replies: 8
Views: 57

### Re: Identifying Lewis Acids and Bases

I'm working on this too because I get confused at times, but the Lewis structures (of course) help me with identifying the Lewis Acids and Bases. If a molecule for example has lone pairs to give would be examples of bases. Central atoms that are electron deficient (maybe having a positive formal ch...
Sat Nov 21, 2020 2:14 am
Forum: Student Social/Study Group
Topic: Post Midterm Blues
Replies: 71
Views: 602

### Re: Post Midterm Blues

I'm already scared for our final knowing how I did for our second midterm... ;-;
Sun Nov 15, 2020 1:10 pm
Forum: Lewis Structures
Topic: Nitrite vs Nitrate
Replies: 17
Views: 130

### Re: Nitrite vs Nitrate

I hope we won't have to know what they are based on their names because I'm confused on how to do that, but I don't think we'll need to because he hasn't taught us. I agree but thankfully many have mentioned that we are not required to memorize them and that they will be provided for us should it c...
Sun Nov 15, 2020 1:07 pm
Forum: Coordinate Covalent Bonds
Topic: When do we use it
Replies: 9
Views: 59

### Re: When do we use it

Thu Nov 12, 2020 4:54 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation Number
Replies: 11
Views: 106

### Re: Oxidation Number

To find the oxidation number of ClO4- you can use a simple equation. Assuming oxygen will have a (-2) oxidation number and knowing the total charge of the molecule is (-1) you can write the equation Cl+4(-2)=-1. Solving for Cl gets you Cl=7, which means the oxidation number for Cl is +7. I apologiz...
Thu Nov 12, 2020 4:49 pm
Forum: Octet Exceptions
Topic: How to tell
Replies: 6
Views: 84

### Re: How to tell

An element can have an expanded octet if its energy level has access to a d orbital. For example, the elements in the 3rd period have access to the 3d subshell, so elements like Phosphorus and Sulfur can have more than the traditional octet. However, elements in the second period like Nitrogen or O...
Thu Nov 12, 2020 4:30 pm
Forum: Sigma & Pi Bonds
Topic: Triple bond?
Replies: 21
Views: 165

### Re: Triple bond?

darchen3G wrote:Single bond: 1 sigma
Double bond: 1 sigma 1 pi
Triple bond: 1 sigma 2 pi
Quadruple bond: 1 sigma 2 pi 1 delta

Thank you for this!!!
Sat Nov 07, 2020 6:34 pm
Forum: Einstein Equation
Topic: E=hv vs E=hf
Replies: 15
Views: 120

### Re: E=hv vs E=hf

Brian Bui 2A wrote:As others said, they are interchangeable! However v (Greek letter) for frequency has a little curve on the left while v for velocity is just straight, if that helps. Very nit-picky details!

Thanks for this! I probably would not have noticed that tiny detail.
Sat Nov 07, 2020 6:26 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Equations Coefficient Question
Replies: 15
Views: 108

### Re: Balancing Equations Coefficient Question

As everyone has said, as long as you multiply both by the same number, you should be fine! :)
Sat Nov 07, 2020 6:11 pm
Forum: SI Units, Unit Conversions
Topic: Using a Calculator
Replies: 10
Views: 86

### Re: Using a Calculator

Another good tip for scientific calculators is to set it SCI mode. Usually, the default is on FLO, but SCI shows results in scientific notation which saves time from homework and test questions. I believe our week 0 sapling optional homework noted this. I didn't know this was a feature! Thank you f...
Sat Nov 07, 2020 6:10 pm
Forum: SI Units, Unit Conversions
Topic: Using a Calculator
Replies: 10
Views: 86

### Re: Using a Calculator

Yes!! If I don't add parenthesis in some occasions, it gives me a totally wrong exponent and it messes everything up!
Sat Nov 07, 2020 6:06 pm
Forum: Significant Figures
Topic: How to use Scientific Notation
Replies: 9
Views: 106

### Re: How to use Scientific Notation

When multiplying two numbers in scientific notation, multiply their coefficients and add their exponents. When dividing two numbers in scientific notation, divide their coefficients and subtract their exponents. If you remember from math where we were taught how to multiply and divide with exponent...
Sat Nov 07, 2020 6:04 pm
Forum: SI Units, Unit Conversions
Topic: SI Unit for Mass
Replies: 10
Views: 101

### Re: SI Unit for Mass

Hi! I am pretty sure mass has to be in kg. In examples where I'm given grams, I convert to kg before using any equation.
Sat Oct 31, 2020 1:05 am
Forum: Properties of Electrons
Topic: Constructive vs Destructive
Replies: 6
Views: 77

### Re: Constructive vs Destructive

Hello! Conceptually, constructive interference occurs when the troughs line up with each other, and when the peaks line up with each other. This results in constructive interference because in either case, the amplitude will increase . And because the amplitude increases, this signals that construc...
Sat Oct 31, 2020 12:54 am
Forum: DeBroglie Equation
Topic: Electron Affinity Sapling
Replies: 6
Views: 94

### Re: Electron Affinity Sapling

Edward Tang 2E wrote:Actually I dont think you need the wavelength equation. Just do e=(c/wavelength)*plancks to figure out the energy of the photon, convert that to eV by dividing 1.602e-19 and you're good

Literally thank you so much for this. I've been struggling with a similar question the entire week.
Sat Oct 31, 2020 12:52 am
Forum: Balancing Chemical Reactions
Topic: Molar Mass
Replies: 23
Views: 181

### Re: Molar Mass

What I normally do is use the entire number from the periodic table and after I'm done with calculations, I round. :)
Sat Oct 31, 2020 12:45 am
Forum: SI Units, Unit Conversions
Topic: Angstrom
Replies: 6
Views: 66

### Re: Angstrom

Hi! I usually put the 2 units I want to convert into a fraction. For example, I know that 1m=100cm, so the fraction can be \frac{1m}{100cm} or \frac{100cm}{1m} . Because the denominator and numerator are the same, both fractions equal to 1. Then, I can multiply a value by this fraction, and cancel ...
Sat Oct 31, 2020 12:43 am
Forum: Ionic & Covalent Bonds
Topic: ligands
Replies: 7
Views: 238

### Re: ligands

They're electron pair donors!
Sat Oct 24, 2020 8:39 pm
Forum: SI Units, Unit Conversions
Topic: Midterm
Replies: 26
Views: 222

### Re: Midterm

Thankfully it's a multiple choice midterm and if I remember correctly, my TA said there weren't going to be too many questions.
Sat Oct 24, 2020 8:32 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty equation with ±
Replies: 10
Views: 57

### Re: Uncertainty equation with ±

Thank you for asking this question! I have been looking for answers for some time now!
Sat Oct 24, 2020 7:57 pm
Forum: Significant Figures
Topic: How would you round these numbers
Replies: 10
Views: 118

### Re: How would you round these numbers

You actually did it correctly!! I also had my doubts about my rounding at first.
Sat Oct 24, 2020 7:47 pm
Topic: Midterm
Replies: 14
Views: 238

### Re: Midterm

Nope! It's not going to be on our midterm (thankfully)!!
Sat Oct 24, 2020 7:35 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Replies: 92
Views: 2030

I personally just plan on working on practice problems and rewatching the video modules since those really seem to help me. I'm also going to try to make time to attend workshops before my midterm. Good luck studying!!
Sun Oct 18, 2020 7:19 pm
Forum: Significant Figures
Topic: rounding during equations
Replies: 14
Views: 106

### Re: rounding during equations

I've found out the hard way that it's best not to round until we are finished with our problem. If we don't, the answer might be off.
Sun Oct 18, 2020 6:20 pm
Forum: Photoelectric Effect
Topic: Light Intensity
Replies: 23
Views: 107

### Re: Light Intensity

Hi there! You are correct, the wavelength/frequency did not change. It is the photons that affect the brightness of light, so it increased.
Sun Oct 18, 2020 6:01 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions Order
Replies: 31
Views: 236

### Re: Balancing Chemical Reactions Order

Hi! I personally do not really have a particular order I follow when I'm balancing chemical equations. However, I have heard that you should first start off with the element that is repeated the most.

I hope that helps!
Sun Oct 18, 2020 5:53 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 5
Views: 42

### Re: Sig Figs

Hi Heather! I also have some trouble with sig figs but I remember someone shared this website so I hope it help you as much as it helped me!

http://chemistry.bd.psu.edu/jircitano/sigfigs.html
Sun Oct 18, 2020 5:48 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Equations
Replies: 11
Views: 104

### Re: Balancing Chemical Equations

Hi there! For the example, CO4, the correct answer would be:

C= 1 and O=4

simply because there is no coefficient next to carbon the same way there is one for hydrogen.
Sat Oct 10, 2020 3:27 pm
Forum: Empirical & Molecular Formulas
Topic: Sapling Week 1 #8
Replies: 23
Views: 234

### Re: Sapling Week 1 #8

Hi! I remember when I saw this problem and was completely overwhelmed but it's actually a lot easier than it seems! To find the molecular formula, simply count how many of each there are for C, H, and O. Upon counting, you'll see you have C6H8O6. To find the mass of the compound, you have to multipl...
Sat Oct 10, 2020 2:54 pm
Forum: Molarity, Solutions, Dilutions
Topic: sapling hw #7
Replies: 17
Views: 165

### Re: sapling hw #7

After reading some of the replies, I'm afraid I have a silly question.
People are saying to "multiply 0.325 with 590.1g" but my question is what they did to get 0.325 and why.
Thank you!
Sat Oct 10, 2020 2:39 pm
Forum: Balancing Chemical Reactions
Topic: Order of Balancing Rxns
Replies: 23
Views: 115

### Re: Order of Balancing Rxns

Hi! So, what I usually do is I try to balance the element that there is more of. Afterwards, I sort of "wing it" and try different numbers until the equation is balanced. I know it's not the best method because it requires some time but I'd like to hear other ways to do so! In regards to k...
Sat Oct 10, 2020 2:34 pm
Forum: Significant Figures
Topic: How to deal with significant figures in decimals with zeros.
Replies: 20
Views: 194

### Re: How to deal with significant figures in decimals with zeros.

Hi Jenaye! I literally was so confused as well when I was working on the Sapling homework not too long ago. But riding off of what others have said, the numbers are important if they're between 2 integers. However, I am still having some trouble understanding the decimal rule.
Sat Oct 10, 2020 2:25 pm
Forum: Molarity, Solutions, Dilutions
Topic: Stuck on Sapling HW
Replies: 14
Views: 199

### Re: Stuck on Sapling HW

I was also confused at first but, you must convert CuNO3 into moles. After you find that number, use the formula: (v=m/n). Remember that the equation gives you the answer in liters to make sure to convert it to milliliters!