Search found 104 matches

by Abigail Menchaca_1H
Sun Mar 15, 2020 11:52 pm
Forum: Zero Order Reactions
Topic: Half life
Replies: 1
Views: 50

Half life

Where do you start when you determine the half life for a zero order reaction?
by Abigail Menchaca_1H
Sun Mar 15, 2020 11:42 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U
Replies: 4
Views: 107

Delta U

When calculating the internal energy of the system how do you know when to change the sign of q/w?
by Abigail Menchaca_1H
Sun Mar 15, 2020 11:25 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: ΔGionization
Replies: 8
Views: 172

ΔGionization

Is there a different way to calculate ΔG ionization?
by Abigail Menchaca_1H
Sun Mar 15, 2020 11:19 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Lewis structures
Replies: 4
Views: 80

Lewis structures

How can you tell if a reaction is endothermic or exothermic with just the lewis structures of the species?
by Abigail Menchaca_1H
Sun Mar 15, 2020 11:10 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: reverse half reaction
Replies: 4
Views: 118

reverse half reaction

How do you know which half redox reaction to reverse and change the sign of the potential?
by Abigail Menchaca_1H
Sun Mar 08, 2020 11:51 pm
Forum: General Rate Laws
Topic: Amount of product formed
Replies: 2
Views: 36

Amount of product formed

Why is it easier to study initial rate when little product formed?
by Abigail Menchaca_1H
Sun Mar 08, 2020 11:41 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Limit on reaction
Replies: 1
Views: 26

Limit on reaction

How is the reaction rate limited by K?
by Abigail Menchaca_1H
Sun Mar 08, 2020 11:33 pm
Forum: General Rate Laws
Topic: Enzyme saturation
Replies: 6
Views: 44

Enzyme saturation

What does the saturation of an enzyme contribute to the rate of reaction?
by Abigail Menchaca_1H
Sun Mar 08, 2020 11:29 pm
Forum: General Rate Laws
Topic: Pseudo rate law
Replies: 3
Views: 26

Pseudo rate law

Can someone explain what psuedo rate laws are and why they're significant?
by Abigail Menchaca_1H
Sun Mar 01, 2020 11:58 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: calomel electrode
Replies: 1
Views: 26

Re: calomel electrode

It's a type of half cell in which the electrode is mercury coated with calomel and the electrolyte is a solution of potassium chloride and saturated calomel and used to measure pH and electrical potentials in solutions.
by Abigail Menchaca_1H
Sun Mar 01, 2020 11:51 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Overall reaction order
Replies: 3
Views: 54

Overall reaction order

What is m in the overall reaction order equation
by Abigail Menchaca_1H
Sun Mar 01, 2020 11:45 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: observing initial rates
Replies: 3
Views: 49

observing initial rates

Why is it easier to observe initial rates when t is close to t=0
by Abigail Menchaca_1H
Sun Mar 01, 2020 11:38 pm
Forum: First Order Reactions
Topic: First order plot
Replies: 3
Views: 49

First order plot

What does the straight line plot of the natural log of reactants vs. time say about the reaction?
by Abigail Menchaca_1H
Sun Mar 01, 2020 11:34 pm
Forum: First Order Reactions
Topic: First Order Reaction
Replies: 4
Views: 60

First Order Reaction

What are characteristics that indicate a first order reaction
by Abigail Menchaca_1H
Thu Feb 27, 2020 9:32 am
Forum: General Rate Laws
Topic: Unique Rate
Replies: 4
Views: 48

Unique Rate

What is the unique rate equation telling us?
by Abigail Menchaca_1H
Mon Feb 24, 2020 10:45 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Free energy difference
Replies: 2
Views: 38

Free energy difference

What does it mean by max cell potential is related to free energy difference between reactants and products?
by Abigail Menchaca_1H
Mon Feb 24, 2020 10:44 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: work max
Replies: 2
Views: 45

work max

What is the maximum work that is done in a system?
by Abigail Menchaca_1H
Mon Feb 24, 2020 10:37 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Usage for Nernst equation
Replies: 7
Views: 163

Usage for Nernst equation

What does it mean by non standard conditions when determining the direction of electron transfer?
by Abigail Menchaca_1H
Mon Feb 24, 2020 10:35 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Salt bridge
Replies: 6
Views: 74

Salt bridge

What does the salt bridge do in the cell diagram?
by Abigail Menchaca_1H
Mon Feb 24, 2020 10:29 am
Forum: Balancing Redox Reactions
Topic: Platinum in cell diagram
Replies: 10
Views: 93

Platinum in cell diagram

Why do we use Platinum when drawing the cell diagram?
by Abigail Menchaca_1H
Sun Feb 16, 2020 11:34 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Signs for Gibbs Free Energy
Replies: 11
Views: 133

Signs for Gibbs Free Energy

What does it mean when Gibbs Free Energy is negative or positive?
by Abigail Menchaca_1H
Sun Feb 16, 2020 10:50 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: ΔU Equal 0
Replies: 4
Views: 202

ΔU Equal 0

If ΔU is zero why does the gas expand
by Abigail Menchaca_1H
Sun Feb 16, 2020 10:28 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Positional entropy
Replies: 3
Views: 78

Positional entropy

What does positional entropy mean and what’s the difference from thermal entropy?
by Abigail Menchaca_1H
Sun Feb 16, 2020 8:34 pm
Forum: Calculating Work of Expansion
Topic: Work without volume
Replies: 5
Views: 123

Work without volume

Can we calculate work without knowing change in volume?
by Abigail Menchaca_1H
Sun Feb 16, 2020 8:26 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Irreversible isothermal expansion of gas
Replies: 4
Views: 74

Irreversible isothermal expansion of gas

How do you solve for the total change in entropy for an isothermally irreversible free expansion of gas?
by Abigail Menchaca_1H
Sun Feb 09, 2020 10:35 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Comparing entropy change
Replies: 2
Views: 35

Comparing entropy change

How would you be able to tell that an entropy change is larger or smaller?
by Abigail Menchaca_1H
Sun Feb 09, 2020 10:33 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Intensive
Replies: 8
Views: 103

Intensive

what does it mean when it says that entropy is an intensive property?
by Abigail Menchaca_1H
Sun Feb 09, 2020 10:30 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Gas v Liquids
Replies: 4
Views: 45

Gas v Liquids

Why do gases have a higher entropy than liquids?
by Abigail Menchaca_1H
Sun Feb 09, 2020 10:19 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: positive-negative entropy
Replies: 1
Views: 22

positive-negative entropy

What are some qualities of a reaction that would determine whether the entropy of the reaction is positive or negative?
by Abigail Menchaca_1H
Sun Feb 09, 2020 9:58 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: use for a calorimeter?
Replies: 2
Views: 32

Re: use for a calorimeter?

Calorimeters measure the heat involved in a chemical reaction. We would use them with exothermic reactions since the solution is absorbing the heat that is produced by the reaction, increasing its temperature.
by Abigail Menchaca_1H
Sun Feb 02, 2020 7:29 pm
Forum: Phase Changes & Related Calculations
Topic: State functions
Replies: 7
Views: 81

State functions

What is the importance of state functions in a system?
by Abigail Menchaca_1H
Sun Feb 02, 2020 7:25 pm
Forum: Calculating Work of Expansion
Topic: Expansion/Extension
Replies: 2
Views: 49

Expansion/Extension

What are examples for work of expansion and work of extension?
by Abigail Menchaca_1H
Sun Feb 02, 2020 7:20 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 4A1
Replies: 2
Views: 35

4A1

What kind of system is a bomb calorimeter in which benzene is burned? and why?
by Abigail Menchaca_1H
Sun Feb 02, 2020 6:54 pm
Forum: General Science Questions
Topic: Midterm
Replies: 17
Views: 362

Re: Midterm

Will they post practice midterm problems on chemistry community like last quarter?
by Abigail Menchaca_1H
Sun Feb 02, 2020 6:50 pm
Forum: General Science Questions
Topic: Midterms
Replies: 22
Views: 337

Re: Midterms

MTanikella_1K wrote:The midterm will cover content from outlines 1-3 and part of outline 4.

Do you know until which focus of outline 4?
by Abigail Menchaca_1H
Sun Jan 26, 2020 7:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp to Kc
Replies: 11
Views: 79

Kp to Kc

If H2O is a gas in Kp, would it be included in the Kc calculation since it's a gas?
by Abigail Menchaca_1H
Sun Jan 26, 2020 6:49 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Delta U
Replies: 3
Views: 35

Delta U

Is there a difference between delta H and delta U?
by Abigail Menchaca_1H
Sun Jan 26, 2020 6:14 pm
Forum: Phase Changes & Related Calculations
Topic: Phase changes
Replies: 8
Views: 72

Phase changes

How do phase changes play a role in standard enthalpy calculations?
by Abigail Menchaca_1H
Sun Jan 26, 2020 5:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH
Replies: 7
Views: 85

pH

How would you find the pH of a solution only given the pKa?
by Abigail Menchaca_1H
Sun Jan 26, 2020 5:26 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Pressure and equilibrium
Replies: 9
Views: 83

Pressure and equilibrium

What effect does pressure have on the equilibrium of the reaction?
by Abigail Menchaca_1H
Sun Jan 19, 2020 11:54 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding a catalyst
Replies: 7
Views: 60

Adding a catalyst

How will adding a catalyst change a reaction's equilibrium state?
by Abigail Menchaca_1H
Sun Jan 19, 2020 11:49 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Halogens
Replies: 2
Views: 58

Halogens

What role to halogens play when it comes to determining the equilibria of a reaction?
by Abigail Menchaca_1H
Sun Jan 19, 2020 11:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5% rule
Replies: 2
Views: 25

5% rule

What is this rule telling us?
by Abigail Menchaca_1H
Sun Jan 19, 2020 11:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q
Replies: 6
Views: 107

Q

When is Q used and what's the difference between it and K?
by Abigail Menchaca_1H
Sun Jan 19, 2020 11:12 pm
Forum: Ideal Gases
Topic: Partial Pressures
Replies: 4
Views: 60

Partial Pressures

What happens to the other reactant partial pressure when one of the reactant partial pressures increases?
by Abigail Menchaca_1H
Sun Jan 12, 2020 5:03 pm
Forum: Ideal Gases
Topic: P=(n/v)RT
Replies: 12
Views: 117

Re: P=(n/v)RT

I think it just means concentration multiplied by the constant and temperature
by Abigail Menchaca_1H
Sun Jan 12, 2020 4:59 pm
Forum: Ideal Gases
Topic: Kc and Kp
Replies: 8
Views: 64

Re: Kc and Kp

Kc also uses brackets whereas Kp uses parentheses
by Abigail Menchaca_1H
Sun Jan 12, 2020 4:57 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc
Replies: 5
Views: 45

Kc

So solids and aqueous solutions can be used to solve for Kc?
by Abigail Menchaca_1H
Sun Jan 12, 2020 4:53 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Thinking point 5J
Replies: 4
Views: 44

Thinking point 5J

"Suppose one of the products of a reaction at equilibrium is a pure solid. How will the equilibrium be affected if some of the solid is removed? If all the solid is removed?"
by Abigail Menchaca_1H
Sun Jan 12, 2020 4:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Finding K: liquids and aqueous
Replies: 7
Views: 73

Finding K: liquids and aqueous

Why do we keep aqueous solutions in the concentration equations and not liquids?
by Abigail Menchaca_1H
Sun Dec 08, 2019 10:16 pm
Forum: Student Social/Study Group
Topic: Week 10 Chemistry Community
Replies: 9
Views: 319

Re: Week 10 Chemistry Community

AGaeta_4E wrote:I think my number of posts is off by one, is this a problem for anyone else?

Maybe depending on the recency of the post your page is currently on might show one less but you still have that post
by Abigail Menchaca_1H
Sun Dec 08, 2019 10:12 pm
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 5002

Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]

For #17 on the marshmallow final, why is the pi bond composition for oxygen is O2p, C2sp2? I thought it only used the p orbital?
by Abigail Menchaca_1H
Sun Dec 08, 2019 10:07 pm
Forum: Student Social/Study Group
Topic: Class Grading
Replies: 44
Views: 2050

Re: Class Grading

Let's hope it gets curved!
by Abigail Menchaca_1H
Sun Dec 08, 2019 9:58 pm
Forum: Student Social/Study Group
Topic: Cyanide
Replies: 5
Views: 204

Cyanide

How do you calculate the formal charges for each atom in CN-?
by Abigail Menchaca_1H
Sun Dec 08, 2019 9:57 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 4
Views: 185

Final

Did anyone know how to do that one question where it asked to draw cyanide and a heme complex and where it attached?
by Abigail Menchaca_1H
Sun Dec 01, 2019 11:39 pm
Forum: Lewis Acids & Bases
Topic: Lewis acid & Bronstead Acid
Replies: 3
Views: 55

Lewis acid & Bronstead Acid

What's the difference between a Lewis acid and a Bronstead acid?
by Abigail Menchaca_1H
Sun Dec 01, 2019 11:25 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: electronegativity
Replies: 4
Views: 57

electronegativity

How do you know when an atom has higher electronegativity? ex) ClO, BrO, IO
by Abigail Menchaca_1H
Sun Dec 01, 2019 11:20 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Trichloroacetic acid
Replies: 2
Views: 46

Trichloroacetic acid

Why is trichloroacetic acid a stronger acid than acetic acid?
by Abigail Menchaca_1H
Sun Dec 01, 2019 11:18 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pka v. ka
Replies: 4
Views: 73

pka v. ka

What is the difference between pKA and KA?
by Abigail Menchaca_1H
Sun Dec 01, 2019 11:16 pm
Forum: Lewis Acids & Bases
Topic: Long bonds vs Short bonds?
Replies: 9
Views: 146

Long bonds vs Short bonds?

Why are long bonds weaker than short bonds?
by Abigail Menchaca_1H
Sun Nov 24, 2019 9:04 pm
Forum: Hybridization
Topic: Shapes
Replies: 3
Views: 46

Shapes

How do different shapes contribute to different hybridizations?
by Abigail Menchaca_1H
Sun Nov 24, 2019 8:57 pm
Forum: Hybridization
Topic: d orbital
Replies: 4
Views: 54

d orbital

why is the d orbital written before the s and p orbital when writing the hybridization state?
by Abigail Menchaca_1H
Sun Nov 24, 2019 8:52 pm
Forum: Hybridization
Topic: C2H4
Replies: 2
Views: 50

C2H4

In class when we wrote the hybridization for C2H4, why is it written as 3sp^2 when there's only 2 central atoms?
by Abigail Menchaca_1H
Sun Nov 24, 2019 8:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 4
Views: 50

Polarity

How can you tell when forces within a molecule cancel out?
by Abigail Menchaca_1H
Sun Nov 24, 2019 6:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: H3O+
Replies: 11
Views: 6139

Re: H3O+

sbeall_1C wrote:Hi!

H3O+ has a molecular geometry of tetrahedral, since there are 4 regions of electron density surrounding the central O atom (3 Hydrogens and 1 lone pair of electrons). The VSEPR shape would be trigonal pyramidal.


What does this mean in terms of bond angles?
by Abigail Menchaca_1H
Sun Nov 24, 2019 2:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: H3O+
Replies: 11
Views: 6139

H3O+

Why is H3O+ tetrahedral?
by Abigail Menchaca_1H
Sun Nov 17, 2019 11:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion strength
Replies: 5
Views: 54

Repulsion strength

Is the repulsion strength stronger when electrons are closer or further apart?
by Abigail Menchaca_1H
Sun Nov 17, 2019 11:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Additional lone pairs
Replies: 2
Views: 28

Additional lone pairs

How do additional lone pairs force bonding electrons closer together?
by Abigail Menchaca_1H
Sun Nov 17, 2019 11:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: electronegativity
Replies: 6
Views: 62

electronegativity

How can you determine high electronegativity in a molecule?
by Abigail Menchaca_1H
Sun Nov 17, 2019 11:25 pm
Forum: Bond Lengths & Energies
Topic: Test 2 Topics
Replies: 40
Views: 828

Re: Test 2 Topics

Does anyone know what sections of the book/homework problems the test covers?
by Abigail Menchaca_1H
Sun Nov 17, 2019 11:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: IMF
Replies: 3
Views: 47

IMF

How can you tell when a molecule has dipole-dipole vs. ion-dipole forces?
by Abigail Menchaca_1H
Sun Nov 10, 2019 7:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: molar mass and attractive interactions
Replies: 3
Views: 45

molar mass and attractive interactions

Why does the increase in molar mass lead to stronger attractive interactions?
by Abigail Menchaca_1H
Sun Nov 10, 2019 7:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Interaction Potential Energy
Replies: 1
Views: 31

Interaction Potential Energy

What is the difference between the equation for the interaction potential energy equation Ep a -a1a2/r^6 and 1/r^6
by Abigail Menchaca_1H
Sun Nov 10, 2019 7:09 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: interactions
Replies: 2
Views: 49

Re: interactions

dipole-induced dipole is a weak attraction that results when a polar molecule induces a dipole in an atom or in a nonpolar molecule by disturbing the arrangement of electrons in the nonpolar species. Dipole-dipole interactions align the molecules to increase the attraction.A dipole is two opposite c...
by Abigail Menchaca_1H
Sun Nov 10, 2019 6:58 pm
Forum: Student Social/Study Group
Topic: Chemistry Youtube Channels
Replies: 8
Views: 140

Re: Chemistry Youtube Channels

The Organic Chemistry Tutor is a helpful channel
by Abigail Menchaca_1H
Sun Nov 10, 2019 6:56 pm
Forum: Hybridization
Topic: 2F.5
Replies: 4
Views: 55

Re: 2F.5

You find the hybridization of an atom by finding its steric number: the number of atoms bonded to the atom + the number of lone pairs the atom has.
by Abigail Menchaca_1H
Sun Nov 03, 2019 11:58 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Electron configuration
Replies: 7
Views: 204

Electron configuration

Does anyone know the factual reasoning behind why we fill up the 4s orbital before the 3d orbital?
by Abigail Menchaca_1H
Sun Nov 03, 2019 11:55 pm
Forum: Quantum Numbers and The H-Atom
Topic: n, l ,ml, ms
Replies: 13
Views: 505

n, l ,ml, ms

I am confused on what to write for ms = ... I am not sure if we are supposed to pick -1/2, +1/2 or both or just how we get an answer for it
by Abigail Menchaca_1H
Sun Nov 03, 2019 11:51 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and covalent bonds
Replies: 2
Views: 47

Ionic and covalent bonds

What is the difference with ionic and covalent bonds when drawing lewis structures?
by Abigail Menchaca_1H
Sun Nov 03, 2019 11:49 pm
Forum: Lewis Structures
Topic: formal charge
Replies: 4
Views: 70

Re: formal charge

formal charge just keeps track of the electrons and whether they are being given away(+) or gained (-)
by Abigail Menchaca_1H
Sun Nov 03, 2019 11:47 pm
Forum: Lewis Structures
Topic: Lewis Structures
Replies: 3
Views: 39

Lewis Structures

How would I know when it is right to use a double bond or triple bond? For example CO
by Abigail Menchaca_1H
Sun Oct 27, 2019 8:25 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2A.15
Replies: 3
Views: 38

Re: 2A.15

I think it is based off the valence electrons and how many are needed or exceeding the number allowed on each shell
by Abigail Menchaca_1H
Sun Oct 27, 2019 7:20 pm
Forum: Ionic & Covalent Bonds
Topic: 2A 19
Replies: 2
Views: 31

Re: 2A 19

Maybe because it is already more than half full, it more favorable to have a full d-orbital and donate the electrons from the highest shell (4s-shell)
by Abigail Menchaca_1H
Sun Oct 27, 2019 6:40 pm
Forum: Ionic & Covalent Bonds
Topic: Charges
Replies: 4
Views: 61

Re: Charges

An S atom has 6 valence electrons and an O atom has 6 valence electrons so when finding the valence electrons for the SO4 compound, you get 30 electrons. 32 valence electrons are needed for 4 full outer shells but SO4 has 30 electrons. So, the charge is 2-.
by Abigail Menchaca_1H
Sun Oct 27, 2019 6:33 pm
Forum: General Science Questions
Topic: Midterms
Replies: 22
Views: 337

Re: Midterms

Jessica Tejero 3L wrote:Midterms are just the prior info given before the test. I believe the finals are cumulative.

So from fundamentals to whatever topic before the midterm?
by Abigail Menchaca_1H
Sun Oct 27, 2019 6:31 pm
Forum: Ionic & Covalent Bonds
Topic: 2A 5
Replies: 2
Views: 38

Re: 2A 5

It's because a full d- orbital is more energetically favorable than a full s- orbital and since it is a Cu + atom, it is removing one electron from the "highest" shell which in this case would be the 4s- shell.
by Abigail Menchaca_1H
Sun Oct 20, 2019 6:43 pm
Forum: Properties of Light
Topic: Wien's Law
Replies: 2
Views: 51

Wien's Law

When are we supposed to use Wien's law? Is it going to be any problem with temperature associated with max wavelength or is it finding the temperature of particular things?
by Abigail Menchaca_1H
Sun Oct 20, 2019 6:38 pm
Forum: Properties of Light
Topic: Week 3 Homework
Replies: 9
Views: 166

Re: Week 3 Homework

I think you can still turn in quantum homework problems since we technically are still working on them this week (Monday).
by Abigail Menchaca_1H
Sun Oct 20, 2019 6:36 pm
Forum: Student Social/Study Group
Topic: Lecture on friday
Replies: 4
Views: 80

Re: Lecture on friday

We went over multielectron atoms and their potential energies of electrons [(q1)(q2)/r] and we talked about electron configurations and the order in which each orbital fills up and writing their structures [1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, (8s, 5g, 6f, 7d, ...
by Abigail Menchaca_1H
Sun Oct 20, 2019 6:16 pm
Forum: Properties of Light
Topic: 1B. 5
Replies: 2
Views: 49

1B. 5

"The y-ray photons emitted by the nuclear decay of a technetium-99 atom used in radiopharmaceuticals have an energy of 140.511 keV. Calculate the wavelength of the these y-rays."
I'm not sure where to start with this problem.
by Abigail Menchaca_1H
Sun Oct 20, 2019 3:59 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 5
Views: 78

Re: Electron Configuration

The order of electrons that fill up orbitals are written as 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, and so on.
by Abigail Menchaca_1H
Tue Oct 08, 2019 11:40 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular to Empirical Formula
Replies: 10
Views: 366

Molecular to Empirical Formula

Does anyone know how to get the molecular formula being given only the empirical formula?
by Abigail Menchaca_1H
Tue Oct 08, 2019 11:36 pm
Forum: Empirical & Molecular Formulas
Topic: Formula Units
Replies: 10
Views: 167

Re: Formula Units

It's used for conversion to atoms, compounds, and molecules.
by Abigail Menchaca_1H
Tue Oct 08, 2019 11:30 pm
Forum: SI Units, Unit Conversions
Topic: Problem G.23
Replies: 3
Views: 91

Re: Problem G.23

You just find the moles of each compound and add them together and divide the sum by the volume in liters.
by Abigail Menchaca_1H
Tue Oct 08, 2019 11:22 pm
Forum: SI Units, Unit Conversions
Topic: Will we have to know how to convert from Fahrenheit, Celsius, and Kelvin?
Replies: 4
Views: 113

Re: Will we have to know how to convert from Fahrenheit, Celsius, and Kelvin?

The formulas are pretty simple and majority of the time the problems are asking for conversion of fahrenheit to celsius or Kelvin.
by Abigail Menchaca_1H
Tue Oct 08, 2019 11:18 pm
Forum: Trends in The Periodic Table
Topic: Chemistry Community
Replies: 4
Views: 85

Re: Chemistry Community

I believe it's due Sunday night at 11:59 pm.
by Abigail Menchaca_1H
Tue Oct 08, 2019 11:17 pm
Forum: Significant Figures
Topic: Significant Figures for Test 1
Replies: 3
Views: 81

Re: Significant Figures for Test 1

I think you should round early on because that l.2595611317x10^-3 is too large and is closer to 1.30x10^-3.
by Abigail Menchaca_1H
Tue Oct 01, 2019 10:45 pm
Forum: Molarity, Solutions, Dilutions
Topic: How to do E15
Replies: 4
Views: 69

Re: How to do E15

Since you don't know what the metal is in this metal hydroxide, you will have to find that first. You want to subtract the hydroxide from the metal 74.10 - (2x1.008 + 2x15.999)= 39.94g/mol. On the periodic table, that mass is closest to Calcium. So your metal is Calcium! Now you want to add the mola...
by Abigail Menchaca_1H
Tue Oct 01, 2019 10:28 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units
Replies: 6
Views: 125

Re: Formula Units

Avogadro's number doesn't really have an assigned unit except for the fact moles can go into it. I think it's useful when you have a value already in moles and you want to convert it to something like atoms or formula units.

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