Search found 65 matches

by Juana Abana 1G
Mon Jan 20, 2020 10:46 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Autoprotolysis
Replies: 4
Views: 31

Re: Autoprotolysis

Sofia Barker 2C wrote:I believe Dr. Lavelle covered autoprotolysis as a way of explaining how 10^-14 = Kw = Ka * Kb, an equation crucial to calculating equilibrium constants and pH / pOH. Other than that, I don't think there's anything else important to know about autoprotolysis.


Oh okay this makes sense...thank you.
by Juana Abana 1G
Mon Jan 20, 2020 10:40 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: temperature
Replies: 10
Views: 32

Re: temperature

Temperature changes the equilibrium constant (K).
by Juana Abana 1G
Mon Jan 20, 2020 10:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Percent Ionization
Replies: 10
Views: 37

Re: Percent Ionization

Yes, as long as the percent Ionization is less than 5% we don't have to do the quadratic equation.
by Juana Abana 1G
Mon Jan 20, 2020 10:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH sig figs
Replies: 9
Views: 21

Re: pH sig figs

For the pH value only the numbers after the decimal point count as significant figures.
by Juana Abana 1G
Mon Jan 20, 2020 10:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ice Box
Replies: 9
Views: 38

Re: Ice Box

I believe that based on the information you are given, like whether the products or the reactants are increasing or decreasing, would determine whether the change is positive or negative. Something to keep in mind: -If you are given initial concentrations and all of them are nonzero, calculate the ...
by Juana Abana 1G
Mon Jan 20, 2020 10:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K
Replies: 5
Views: 17

Re: K

K only changes when the temperature changes.
by Juana Abana 1G
Mon Jan 20, 2020 10:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Writing K Expression
Replies: 6
Views: 14

Re: Writing K Expression

Yes, H20 is included in the K and the Q equation when it is a gas. The only things that you do not include in these equations are solids and liquids.
by Juana Abana 1G
Mon Jan 20, 2020 9:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Converting K to Kc
Replies: 4
Views: 28

Re: Converting K to Kc

PV=nRT is used to convert between Kc and Kp.
by Juana Abana 1G
Mon Jan 20, 2020 9:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Does order matter?
Replies: 5
Views: 15

Re: Does order matter?

No, the order that the reactants and products are written should not matter as long as the products are in the numerator and the reactants are in the denominator.
by Juana Abana 1G
Mon Jan 20, 2020 9:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: parts of salts that don't affect pH
Replies: 4
Views: 19

Re: parts of salts that don't affect pH

All the conjugate base/acid of a strong acid or base will not affect the pH of the solution because they are the extremely weak conjugate base and acid of strong acid and base and therefore will not play a role in changing the pH level. Oh okay... this makes sense as to why strong acids and bases w...
by Juana Abana 1G
Thu Jan 09, 2020 11:56 am
Forum: Ideal Gases
Topic: Units for Pressure
Replies: 6
Views: 41

Re: Units for Pressure

Natalie Benitez 1C wrote:What is the difference between the bar unit and the atm unit for pressure?


Yes, I have the same question.
by Juana Abana 1G
Thu Jan 09, 2020 11:52 am
Forum: Ideal Gases
Topic: The Difference between Q and Kc [ENDORSED]
Replies: 18
Views: 882

Re: The Difference between Q and Kc [ENDORSED]

Q and K are calculated using the same equation however, K calculates the reaction at equilibrium meanwhile Q can calculate a particular point in a reaction.
by Juana Abana 1G
Thu Jan 09, 2020 11:48 am
Forum: Ideal Gases
Topic: Understanding Q
Replies: 19
Views: 67

Re: Understanding Q

Yes, you solve for Q the same way you would solve for K.
by Juana Abana 1G
Thu Jan 09, 2020 11:45 am
Forum: Ideal Gases
Topic: Understanding Q
Replies: 13
Views: 60

Re: Understanding Q

Yes you would leave out solids and liquids.
by Juana Abana 1G
Thu Jan 09, 2020 11:28 am
Forum: Ideal Gases
Topic: K and Q
Replies: 13
Views: 48

Re: K and Q

Use K when the reaction is at equilibrium.
Use Q at any point in the reaction (when the reaction is not at equilibrium).
by Juana Abana 1G
Mon Dec 02, 2019 8:03 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Relative Acidity
Replies: 4
Views: 32

Re: Relative Acidity

oh okay, so the more electronegative the more stable the anion?
by Juana Abana 1G
Mon Dec 02, 2019 7:27 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH formula?
Replies: 21
Views: 386

Re: pH formula?

so is it fine to just know the pH formula?
by Juana Abana 1G
Mon Dec 02, 2019 7:07 pm
Forum: Amphoteric Compounds
Topic: water
Replies: 3
Views: 21

Re: water

Yes, water is an amphoteric compound because it can act as a base or as an acid.
by Juana Abana 1G
Mon Dec 02, 2019 6:59 pm
Forum: Lewis Acids & Bases
Topic: lewis vs. bronsted
Replies: 10
Views: 57

Re: lewis vs. bronsted

A Bronsted Acid is a proton donor, a Lewis Acid accepts an electron pair. These are interchangeable because they are saying the same thing. When a proton is donated, the molecule becomes more negative, which is like accepting an electron pair. Bronsted and Lewis acids are the same thing, just a dif...
by Juana Abana 1G
Mon Dec 02, 2019 8:49 am
Forum: Lewis Acids & Bases
Topic: Homework
Replies: 4
Views: 28

Re: Homework

Yes, we have to turn in homework for last week and this week.
by Juana Abana 1G
Sun Dec 01, 2019 9:55 pm
Forum: Lewis Acids & Bases
Topic: Proton acceptor and proton donor?
Replies: 33
Views: 133

Re: Proton acceptor and proton donor?

Acids are proton donors and bases are proton acceptors.
by Juana Abana 1G
Sun Dec 01, 2019 9:53 pm
Forum: Lewis Acids & Bases
Topic: Final
Replies: 4
Views: 19

Re: Final

Yes, I feel like most of the final will consist more on what we covered more recently.
by Juana Abana 1G
Sun Dec 01, 2019 9:43 pm
Forum: Air Pollution & Acid Rain
Topic: Clean Coal vs Dirty Coal?
Replies: 16
Views: 119

Re: Clean Coal vs Dirty Coal?

Clean coal has less sulfur which contributes less to acid rain.
by Juana Abana 1G
Sun Dec 01, 2019 9:00 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 12
Views: 88

Re: Cisplatin

I think the important thing about cisplatin is the way its structure affects its biological function. Because the two chlorine atoms are next to each other instead of across, they can bond to both sides of DNA's double helix, preventing it from "unzipping" and therefore stopping replicati...
by Juana Abana 1G
Sun Dec 01, 2019 8:10 pm
Forum: Naming
Topic: Final Exam?
Replies: 20
Views: 128

Re: Final Exam?

Yeah, the final exam is cumulative.
by Juana Abana 1G
Sun Nov 24, 2019 9:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE Format
Replies: 34
Views: 121

Re: AXE Format

You don't have to write a subscript if it is just 1 but you can if you want.
by Juana Abana 1G
Sun Nov 24, 2019 9:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 5
Views: 28

Re: Polarity

If a molecule has dipole moments that do not cancel, then it is polar. If the dipole moments do cancel, then it is non-polar. One general rule to know is that molecules with a tetrahedral shape generally are non-polar unless the the outer atoms are not identical. Also while linear shaped molecules ...
by Juana Abana 1G
Sun Nov 24, 2019 9:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 2
Views: 29

Re: Test 2

Yeah, you maybe able to get the test back during office hours but I'm not sure.
by Juana Abana 1G
Sun Nov 24, 2019 9:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw
Replies: 23
Views: 124

Re: Seesaw

Yes, it should be less than 90 or 120 because of the lone pair repulsion.
by Juana Abana 1G
Sun Nov 24, 2019 9:01 pm
Forum: Dipole Moments
Topic: Hydrogen Bonding
Replies: 17
Views: 188

Re: Hydrogen Bonding

Yes, hydrogen bonding can only occur if an H atom is bonded with a N, O, or F atom.
by Juana Abana 1G
Thu Nov 14, 2019 6:31 pm
Forum: Sigma & Pi Bonds
Topic: Drawing
Replies: 6
Views: 32

Re: Drawing

We would have to be able to identify the shape as well as the angles between the atoms.
by Juana Abana 1G
Thu Nov 14, 2019 6:28 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 12
Views: 75

Re: Polarity

Andrew Liang 4G wrote:Another tip that I learned from my TA today was that most of the time when the central atom has lone pairs then the molecule is most likely to be polar.


Thanks for the tip this is really helpful.
by Juana Abana 1G
Thu Nov 14, 2019 6:26 pm
Forum: Electronegativity
Topic: Atom size
Replies: 16
Views: 159

Re: Atom size

Atomic radius increases as you move down a group as well as when you move from right to left on a period. It is basically the opposite of electronegativity.
by Juana Abana 1G
Thu Nov 14, 2019 6:06 pm
Forum: Bond Lengths & Energies
Topic: Week 7 Homework
Replies: 15
Views: 147

Re: Week 7 Homework

I think you can in questions from the chemical bonds section or the molecular shape and structure section.
by Juana Abana 1G
Thu Nov 14, 2019 6:03 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Best Formal Charge
Replies: 7
Views: 82

Re: Best Formal Charge

Yes, the most electronegative atom should be the one to carry the negative charge since it has a stronger pull of electrons.
by Juana Abana 1G
Thu Nov 07, 2019 9:54 pm
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 22
Views: 101

Re: Trend of Electronegativity

On the periodic table electronegativity increases from left to right and decreases from top to bottom.
by Juana Abana 1G
Thu Nov 07, 2019 9:20 pm
Forum: Bond Lengths & Energies
Topic: Why Are Double Bonds Shorter
Replies: 16
Views: 173

Re: Why Are Double Bonds Shorter

Double bonds are shorter and stronger since the electrons between the two elements are pulled closer together.
by Juana Abana 1G
Thu Nov 07, 2019 8:55 pm
Forum: Bond Lengths & Energies
Topic: Midterm
Replies: 9
Views: 101

Re: Midterm

The midterm should be graded by next week.
by Juana Abana 1G
Thu Nov 07, 2019 8:51 pm
Forum: Bond Lengths & Energies
Topic: Bonding
Replies: 7
Views: 61

Re: Bonding

Anything from the third row the periodic table and the rows that follow can have expanded octets.
by Juana Abana 1G
Thu Nov 07, 2019 8:29 pm
Forum: Bond Lengths & Energies
Topic: Test 2 Topics
Replies: 40
Views: 362

Re: Test 2 Topics

Jorge Ramirez_4H wrote:What week is this test?


Test 2 will be given on week 8.
by Juana Abana 1G
Sat Nov 02, 2019 4:04 pm
Forum: General Science Questions
Topic: Can We Take The Final In Pencil?
Replies: 14
Views: 511

Re: Can We Take The Final In Pencil?

Unfortunately the final will be have to be written in pen just like the midterm and the tests.
by Juana Abana 1G
Sat Nov 02, 2019 3:58 pm
Forum: Sigma & Pi Bonds
Topic: Double bond
Replies: 15
Views: 107

Re: Double bond

You add double bonds to a lewis structure in order to satisfy the octet rule and make the molecule more stable. You would also add double bonds in order to decrease the formal charges of the molecule.
by Juana Abana 1G
Sat Nov 02, 2019 3:51 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E-textbook [ENDORSED]
Replies: 20
Views: 1092

Re: Accessing the E-textbook [ENDORSED]

Kennedi3K wrote:Does anyone know if Sapling is mandatory?

No you don't have to buy it. It is another additional resource that you can use.
by Juana Abana 1G
Fri Nov 01, 2019 9:01 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm
Replies: 28
Views: 182

Re: Midterm

Yes, the midterm will include everything up to week five.
by Juana Abana 1G
Mon Oct 28, 2019 9:20 am
Forum: Ionic & Covalent Bonds
Topic: Homework
Replies: 13
Views: 109

Re: Homework

Yeah, most likely since that is what we are going over in lecture.
by Juana Abana 1G
Mon Oct 28, 2019 9:16 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: electron configuration
Replies: 4
Views: 38

Re: electron configuration

If I understood correctly the 4s sublevel is lower in energy and that is why it is filled before the 3d sublevel because the 4s is lower in energy. However, after the 4s state is occupied the 3rd state becomes lower in energy. Because the 4s orbital then behaves as the outermost, highest energy orb...
by Juana Abana 1G
Mon Oct 28, 2019 9:13 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 58
Views: 506

Re: Advice for studying

JohannaPerezH3D wrote:I've also been struggling a lot with keeping up with the material, so if anyone wants to study together and prepare lemme know but I think something that is definitely important is to prepare before the week starts


Yes, me too.
by Juana Abana 1G
Mon Oct 28, 2019 9:07 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Useful YouTube videos?
Replies: 6
Views: 38

Re: Useful YouTube videos?

Yess Bozeman science does really help.
by Juana Abana 1G
Mon Oct 28, 2019 9:05 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: oribital numbers
Replies: 7
Views: 38

Re: oribital numbers

You can generally memorize the number of orbitals, but if you want to be technical... You can figure out the number of orbitals per sub shell through the quantum numbers! The subshells are depicted by l = 0,1,2,3 (which is s,p,d, and f, respectively). The magnetic quantum number m represents the in...
by Juana Abana 1G
Mon Oct 28, 2019 9:03 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Octet Rules
Replies: 8
Views: 45

Re: Octet Rules

jeffreygong1I wrote:It just means that most atoms prefer to have(are most stable with) eight valence electrons, although there are exceptions...


Yup, I agree.
by Juana Abana 1G
Sun Oct 20, 2019 7:52 pm
Forum: Properties of Light
Topic: MidTerms and Finals
Replies: 11
Views: 85

Re: MidTerms and Finals

Only test 2 will be given in discussion. The midterm and final will be given outside of discussion at different locations and at different times.
by Juana Abana 1G
Sat Oct 19, 2019 4:48 pm
Forum: Properties of Light
Topic: Next test
Replies: 23
Views: 195

Re: Next test

The equation sheet we got on the first test will be given to us for all the other tests.
by Juana Abana 1G
Sat Oct 19, 2019 4:45 pm
Forum: Properties of Light
Topic: 1A.9 Energy of Photon
Replies: 12
Views: 79

Re: 1A.9 Energy of Photon

You would use the equation: E = hv
by Juana Abana 1G
Sat Oct 19, 2019 4:43 pm
Forum: Properties of Light
Topic: What are the units of hertz
Replies: 41
Views: 235

Re: What are the units of hertz

The units for hertz is one cycle per second (s^-1)
by Juana Abana 1G
Sat Oct 19, 2019 4:40 pm
Forum: Properties of Light
Topic: Midterm Exam
Replies: 21
Views: 184

Re: Midterm Exam

Drake Choi_1I wrote:Is there going to be a curve for the midterm? Or is grade based on raw score?


The syllabus mentions that the tests aren't curved.
by Juana Abana 1G
Fri Oct 11, 2019 2:32 pm
Forum: SI Units, Unit Conversions
Topic: Course Reader
Replies: 6
Views: 99

Re: Course Reader

There is no course reader for the class.
by Juana Abana 1G
Fri Oct 11, 2019 2:30 pm
Forum: Empirical & Molecular Formulas
Topic: Converting from grams to percentage
Replies: 11
Views: 106

Re: Converting from grams to percentage

In order to find the empirical formula, you should first turn the grams given into a percentage. Then divide by the molar mass, and then divide by the smallest value.
by Juana Abana 1G
Fri Oct 11, 2019 8:46 am
Forum: Balancing Chemical Reactions
Topic: Fractions
Replies: 20
Views: 187

Re: Fractions

I think it would be better to multiply the faction in order to get an integer.
by Juana Abana 1G
Fri Oct 11, 2019 8:34 am
Forum: Empirical & Molecular Formulas
Topic: Empirical Ratio Rounding
Replies: 6
Views: 70

Re: Empirical Ratio Rounding

I think if after dividing you get .9 then it is okay to round up in order to get the empirical formula.
by Juana Abana 1G
Fri Oct 11, 2019 8:28 am
Forum: Significant Figures
Topic: %Mass Composition
Replies: 12
Views: 129

Re: %Mass Composition

The number of sig figs depends on the lowest number that they give you in the problem.
by Juana Abana 1G
Fri Oct 04, 2019 6:38 pm
Forum: Molarity, Solutions, Dilutions
Topic: Clarification
Replies: 7
Views: 101

Re: Clarification

magaliolide1D wrote:Do the moles of a solute change when being diluted at all, in any instance? If not, why?


Yes I was confused on this as well.
by Juana Abana 1G
Fri Oct 04, 2019 6:34 pm
Forum: SI Units, Unit Conversions
Topic: Homework for Week 1
Replies: 16
Views: 258

Re: Homework for Week 1

Does anyone know if the homework needs to be written in pen or is it fine to write it in pencil?
by Juana Abana 1G
Fri Oct 04, 2019 6:31 pm
Forum: Balancing Chemical Reactions
Topic: Fractions in front of compounds
Replies: 12
Views: 93

Re: Fractions in front of compounds

Yes, you have to multiply both sides of the equation by the smallest factor in order to get rid of the fraction.
by Juana Abana 1G
Thu Oct 03, 2019 4:51 pm
Forum: Empirical & Molecular Formulas
Topic: Rounding [ENDORSED]
Replies: 12
Views: 133

Re: Rounding [ENDORSED]

"Sig figs" is a shorthand term for "significant figures," a term in chemistry used to help gauge level of accuracy as well as error. The general rule is that your answer should contain the same number of significant figures as the term in the problem with the lowest number. Exam...
by Juana Abana 1G
Thu Oct 03, 2019 4:36 pm
Forum: SI Units, Unit Conversions
Topic: Question about Showing Work
Replies: 22
Views: 212

Re: Question about Showing Work

I definitely suggest showing your work because it's easier to go back and see what you did step by step when you need to study for the test/midterm/final.

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