Search found 100 matches

by Juana Abana 1G
Sat Mar 14, 2020 3:39 pm
Forum: Zero Order Reactions
Topic: Example Help
Replies: 6
Views: 76

Re: Example Help

Michael Nguyen 1E wrote:If you see a graph of [A] v. t and it is linear with a negative slope, you know that the reaction is zero-order with respect to that reactanct. The rate constant k is equal to the negative of the slope.



Thank you this is very helpful.
by Juana Abana 1G
Sat Mar 14, 2020 3:34 pm
Forum: Zero Order Reactions
Topic: 0 order
Replies: 6
Views: 36

Re: 0 order

In a zero order reaction concentration of the reactants does not affect rate.
by Juana Abana 1G
Fri Mar 06, 2020 7:26 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Finding Q
Replies: 7
Views: 77

Re: Finding Q

Brooke Yasuda 2J wrote:Yes, the anode is the product and the cathode is the reactant. This makes sense because in the anode the concentrations of reactant are decreasing as it forms product in the cathode.



So then the anode is always the product and the cathode is always the reactant?
by Juana Abana 1G
Fri Mar 06, 2020 7:13 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Inert electrodes
Replies: 5
Views: 50

Re: Inert electrodes

If there isn't a solid electrode in the half reaction then you would add an inert electrode such as Pt.
by Juana Abana 1G
Fri Mar 06, 2020 7:02 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: galvanic cells
Replies: 8
Views: 79

Re: galvanic cells

Daniela Shatzki 2E wrote:if two are given you can't use the formula Ecell = Ecathode - Eanode and then decide which is which based on which arrangement will give you a positive overall value.



Does this work all the time?
by Juana Abana 1G
Fri Mar 06, 2020 6:59 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagram Order
Replies: 8
Views: 74

Re: Cell Diagram Order

Anode || Cathode
s | g | aq || aq | g | s
by Juana Abana 1G
Fri Mar 06, 2020 6:42 am
Forum: Balancing Redox Reactions
Topic: oxidizing and reducing agents
Replies: 10
Views: 61

Re: oxidizing and reducing agents

I find it very helpful to write out the half reactions to really gain an understanding of the redox reaction. To do this, you will have to determine the oxidation numbers of the elements being reduced and oxidized. Toolbox K.1 on page F80 is very useful to refresh on oxidation numbers. Thanks this ...
by Juana Abana 1G
Fri Mar 06, 2020 6:39 am
Forum: Balancing Redox Reactions
Topic: Balancing half reactions in acidic conditions
Replies: 8
Views: 57

Re: Balancing half reactions in acidic conditions

You would use H+ to balance out the hydrogens.
by Juana Abana 1G
Thu Mar 05, 2020 7:23 pm
Forum: Balancing Redox Reactions
Topic: Simplifying
Replies: 7
Views: 78

Re: Simplifying

Simplifying can be done after adding both half reactions.
by Juana Abana 1G
Thu Mar 05, 2020 7:16 pm
Forum: Balancing Redox Reactions
Topic: Half rxns
Replies: 27
Views: 216

Re: Half rxns

To balance acidic solutions you add H2O to balance the O's and then add H+ to balance the H's. Then you balance the electrons. However when balancing basic solutions you add H2O to balance the O's and then add H+ to balance the H's, but for every proton that you add you also add OH- to both sides of...
by Juana Abana 1G
Thu Feb 27, 2020 9:42 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Where to find Ecell values
Replies: 15
Views: 99

Re: Where to find Ecell values

They are located in Appendix 2B in the textbook.
by Juana Abana 1G
Thu Feb 27, 2020 9:35 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: nerst
Replies: 7
Views: 56

Re: nerst

Your n value is found by balancing the equation and determining the number of electrons that it took to balance it. So basically your n value is the number of electrons that it took to balance the equation.
by Juana Abana 1G
Thu Feb 27, 2020 9:11 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: When to apply Pt into cell diagrams
Replies: 9
Views: 73

Re: When to apply Pt into cell diagrams

You would use Pt(S) in a cell diagram if there is no other metal present in the reaction that can be used as the conductor.
by Juana Abana 1G
Thu Feb 27, 2020 9:00 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cells
Replies: 5
Views: 29

Re: cells

BAlvarado_1L wrote:galvanic cells are positive while electrolysis is negative a helpful way to remember this is by knowing that electrolysis requires electricity to occur


Thank you, this is a very helpful way to remember!
by Juana Abana 1G
Thu Feb 27, 2020 8:57 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Potentials on Test 2
Replies: 3
Views: 22

Re: Cell Potentials on Test 2

Yes, they most likely will provide those values on the formula sheet.
by Juana Abana 1G
Thu Feb 27, 2020 8:52 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Drawing Cell Diagram
Replies: 7
Views: 43

Re: Drawing Cell Diagram

No, you do not need to include the coefficient of the molecules. You only include their states.
by Juana Abana 1G
Thu Feb 27, 2020 8:44 pm
Forum: Balancing Redox Reactions
Topic: How to tell if its being reduced or oxidized
Replies: 15
Views: 90

Re: How to tell if its being reduced or oxidized

i get confused on how to figure out which one is being reduced and oxidized in redox rxns. Does anyone know how I can tell the difference for example MnO4^- to Mn^2+. Since it is going from a negative to positive charge in the end wouldn't it mean that it is being oxidized? Yes, I also get confused...
by Juana Abana 1G
Wed Feb 19, 2020 9:15 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: spontaneity
Replies: 34
Views: 340

Re: spontaneity

If the delta g value is negative then the reaction is considered spontaneous.
by Juana Abana 1G
Wed Feb 19, 2020 8:05 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Enthalpy
Replies: 12
Views: 159

Re: Enthalpy

The value of a state function is only dependent on the initial value and the final value.
by Juana Abana 1G
Tue Feb 18, 2020 10:28 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U = 0
Replies: 8
Views: 114

Re: Delta U = 0

Delta U is zero when there is no change in temperature.
by Juana Abana 1G
Tue Feb 18, 2020 10:22 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Work
Replies: 14
Views: 135

Re: Work

When a system does work then work is positive, but when work is being done on a system then work is negative.
by Juana Abana 1G
Tue Feb 18, 2020 10:16 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Intensive vs. Extensive
Replies: 15
Views: 123

Re: Intensive vs. Extensive

Extensive properties depend on the amount of matter being measured meanwhile intensive properties don't.
by Juana Abana 1G
Tue Feb 18, 2020 9:13 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Kelvin or Celsius?
Replies: 47
Views: 528

Re: Kelvin or Celsius?

You would use kelvin.
by Juana Abana 1G
Tue Feb 18, 2020 9:07 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated vs Closed [ENDORSED]
Replies: 34
Views: 316

Re: Isolated vs Closed [ENDORSED]

An insulated water bottle can be considered an isolated system because it can neither exchange any substances nor energy with its surrounding.
by Juana Abana 1G
Tue Feb 18, 2020 8:53 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Constant R
Replies: 15
Views: 135

Re: Constant R

To determine when to use which it is best to look at the units to see which units will cancel out and also see what units you will be left with.
by Juana Abana 1G
Sun Feb 02, 2020 11:40 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE BOX
Replies: 27
Views: 180

Re: ICE BOX

When the K value is less than 10^-3 then you can assume that the K value it is too small to affect the concentration.
by Juana Abana 1G
Sun Feb 02, 2020 11:35 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: H2O as a Gas
Replies: 12
Views: 92

Re: H2O as a Gas

Yes, you would include it if it was a gas.
by Juana Abana 1G
Sun Feb 02, 2020 11:28 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature
Replies: 14
Views: 75

Re: Temperature

A negative delta H is exothermic since energy is being released.
by Juana Abana 1G
Sun Feb 02, 2020 11:10 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Forming bonds
Replies: 8
Views: 42

Re: Forming bonds

When bonds are formed they become more stable and therefore release energy.
by Juana Abana 1G
Sun Feb 02, 2020 11:02 pm
Forum: Phase Changes & Related Calculations
Topic: Reversible and Irreversible
Replies: 5
Views: 47

Re: Reversible and Irreversible

Michael Du 1E wrote:Can anyone please clarify the differences between the reversible and irreversible process? thank you


Yes, I am confused on this as well.
by Juana Abana 1G
Sun Feb 02, 2020 10:58 pm
Forum: Phase Changes & Related Calculations
Topic: Calorimeters
Replies: 8
Views: 47

Re: Calorimeters

If a bomb calorimeter is used then it is an isolated system
by Juana Abana 1G
Sun Feb 02, 2020 10:52 pm
Forum: Phase Changes & Related Calculations
Topic: State functions
Replies: 7
Views: 60

Re: State functions

State functions are properties whose value does not depend on the path taken to reach that specific value. Some examples are internal energy, enthalpy, and entropy. However, things like heat and work aren't state functions, because they depend on the path taken from the initial to the final values....
by Juana Abana 1G
Sun Feb 02, 2020 10:45 pm
Forum: Phase Changes & Related Calculations
Topic: Why does steam cause burns?
Replies: 29
Views: 171

Re: Why does steam cause burns?

Steam causes severe burns since it experiences a phase change and releases a big amount of heat when it comes into contact with skin
by Juana Abana 1G
Sun Feb 02, 2020 10:20 pm
Forum: Phase Changes & Related Calculations
Topic: Pressure in an Open Beaker
Replies: 10
Views: 47

Re: Pressure in an Open Beaker

Because of the fact that the beaker is open and exposed to the atmosphere that is very large in comparison to the beaker, the pressure within the beaker remains constant.
by Juana Abana 1G
Sun Feb 02, 2020 9:28 pm
Forum: Phase Changes & Related Calculations
Topic: Open vs Isolated System
Replies: 15
Views: 87

Re: Open vs Isolated System

An open system can exchange matter and energy with its environment, a closed system can exchange only energy with its environment, and an isolated can not exchanged anything with its environment.
by Juana Abana 1G
Mon Jan 20, 2020 10:46 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Autoprotolysis
Replies: 5
Views: 74

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: 62

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: 11
Views: 89

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: 42

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: 70

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: 37

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: 38

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: 43

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: 30

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: 34

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: 63

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: 1444

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: 116

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: 97

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: 82

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: 49

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: 540

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: 36

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: 84

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: 44

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: 226

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: 35

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: 167

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: 120

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: 177

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: 188

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: 45

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: 42

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: 172

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: 294

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: 48

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: 109

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: 278

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: 185

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: 129

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: 166

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: 268

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: 124

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: 81

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: 503

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: 607

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: 157

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: 21
Views: 2049

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: 258

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: 151

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: 60

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: 973

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: 66

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: 61

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: 77

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: 112

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: 303

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: 106

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: 353

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: 229

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: 133

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: 175

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: 298

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: 86

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: 198

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: 142

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: 316

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: 136

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: 152

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: 316

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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