## Search found 60 matches

Fri Mar 15, 2019 12:12 am
Forum: First Order Reactions
Topic: Order of reactions plots
Replies: 2
Views: 116

### Order of reactions plots

Which plots are associated with which reaction order? I remember they are all linear but I don't remember the axis
Fri Mar 15, 2019 12:11 am
Forum: First Order Reactions
Topic: Linear plots problem 15.99
Replies: 1
Views: 61

### Linear plots problem 15.99

How do you know if a plot is linear or not?
Fri Mar 15, 2019 12:08 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrehnius Equation
Replies: 2
Views: 96

### Arrehnius Equation

Will the formula ln(k'/k)=(Ea/R)((T'-T/TT')) be given? Did we go over its derivation in class before?
Mon Mar 11, 2019 1:12 am
Forum: Zero Order Reactions
Topic: Zero Order Reactions
Replies: 8
Views: 525

### Zero Order Reactions

What is the difference between zero, first, and second order reactions? What do they actually represent?
Mon Mar 11, 2019 1:11 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell Diagrams
Replies: 1
Views: 115

### Cell Diagrams

What are the rules and symbols for drawing cell diagrams?
Mon Mar 11, 2019 1:10 am
Forum: Balancing Redox Reactions
Topic: Balancing redox rxns in basic solution
Replies: 2
Views: 135

### Balancing redox rxns in basic solution

How do you balance redox rxns in basic solution? Is there a process or steps that can be taken for any given problem?
Mon Feb 25, 2019 3:36 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic cells [ENDORSED]
Replies: 1
Views: 80

### Galvanic cells[ENDORSED]

Do galvanic cells have real applications or do they just show electron transfer
Mon Feb 25, 2019 3:33 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Porous disk [ENDORSED]
Replies: 1
Views: 95

### Porous disk[ENDORSED]

What is the purpose of a porous disk instead of two separate beakers?
Mon Feb 25, 2019 3:31 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: E and Enaught [ENDORSED]
Replies: 1
Views: 128

### E and Enaught[ENDORSED]

What's the difference between E and Enaught?
Mon Feb 25, 2019 3:27 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: DeltaG [ENDORSED]
Replies: 1
Views: 103

### DeltaG[ENDORSED]

Is the equation deltaG=nFE calculating the free energy of the cell?
Mon Feb 25, 2019 3:27 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst equation [ENDORSED]
Replies: 2
Views: 270

### Nernst equation[ENDORSED]

What's the purpose of the nernst equation and how do we use it?
Mon Feb 25, 2019 3:26 pm
Forum: Balancing Redox Reactions
Topic: Balancing half reactions [ENDORSED]
Replies: 1
Views: 62

### Balancing half reactions[ENDORSED]

How exactly do you balance half reactions and what's the purpose?
Tue Feb 19, 2019 11:08 pm
Forum: Van't Hoff Equation
Topic: Equation Purpose
Replies: 2
Views: 160

### Equation Purpose

What is the purpose of the Van't Hoff equation?
Tue Feb 19, 2019 11:08 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs concept
Replies: 7
Views: 357

### Gibbs concept

Is gibbs basically the total change in enthalpy and entropy of a system?
Tue Feb 19, 2019 11:07 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs equation
Replies: 2
Views: 121

### Gibbs equation

In terms of this new equation, does it mean that deltaH negative no longer implies spontaneous reactions?
Mon Feb 04, 2019 12:19 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat capacity
Replies: 2
Views: 118

### Heat capacity

Is heat capacity usually given in a problem or would we have to somehow calculate it?
Mon Feb 04, 2019 12:17 pm
Forum: Phase Changes & Related Calculations
Topic: Phase change problems
Replies: 2
Views: 113

### Phase change problems

How do you account for phase changes in calculations?
Mon Feb 04, 2019 12:16 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard formation deltaH
Replies: 2
Views: 130

### Standard formation deltaH

I'm confused with what exactly deltaH of formation means and how we apply it/use it
Mon Feb 04, 2019 12:15 pm
Forum: Calculating Work of Expansion
Topic: Work equation
Replies: 2
Views: 140

### Work equation

How do you differentiate which work equation to use?
Mon Feb 04, 2019 12:14 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Equation for internal energy
Replies: 2
Views: 116

### Equation for internal energy

In deltaU=q+w,

What does the term q represent?
Mon Feb 04, 2019 12:13 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Closed and Isolated
Replies: 10
Views: 282

### Closed and Isolated

How can you tell if a system is closed or isolated?
Sun Jan 27, 2019 11:37 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Question 12.63 (Sixth Edition)
Replies: 1
Views: 300

### Re: Question 12.63 (Sixth Edition)

Deprotonation is the ratio of the concentration of deprotonated molecule over the initial concentration of the acid. With these concentrations and a Ka value, you should be able to solve for H30+ ion concentration to find pH
Sun Jan 27, 2019 11:34 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Injecting noble gasses
Replies: 7
Views: 306

### Injecting noble gasses

Does injecting noble gasses to a reaction vessel with constant volume do anything? Why or why not?
Sun Jan 27, 2019 11:34 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Units of Kp
Replies: 9
Views: 1197

### Units of Kp

What are the units of the partial pressure of gasses in Kp?
Fri Jan 18, 2019 1:35 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Autoprotolysis
Replies: 2
Views: 120

### Autoprotolysis

I don't really understand what the autoprotolysis constant is and what it's function/use is
Fri Jan 18, 2019 1:23 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pressure
Replies: 2
Views: 152

### Re: pressure

Adding inert gas does not change the volume and therefore does not change the concentration.

Compressing would physically change the volume

Keep in mind the formula for concentration=n/v

Compressing would increase concentration

Adding moles of other inert gas does not affect other concentrations
Tue Jan 15, 2019 6:31 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: HW Question 11.89
Replies: 1
Views: 68

### HW Question 11.89

The solution manual gives the equation as 2A(g) -> B(g) + 2C(g)
Where are the coefficients coming from?

The calculation of the Kp is given as ((5/100)(10/100)^2)/(18/100)^2=1.54x10^-2
Why are the values over 100?
Sun Jan 13, 2019 5:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Constants using pressure or concentration
Replies: 2
Views: 63

### Re: Constants using pressure or concentration

K(p) is also only used if all products and reactants are gaseous
Sun Jan 13, 2019 5:48 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating Concentrations Question
Replies: 1
Views: 130

### Calculating Concentrations Question

Will we ever be doing calculations involving 3rd degree or higher polynomials for concentrations?
Mon Jan 07, 2019 8:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6th Edition Ch11 Question 1d
Replies: 3
Views: 113

### 6th Edition Ch11 Question 1d

Q: True or False
If one starts with higher concentrations of reactants, the equilibrium concentrations of the products will be larger

What is the difference between equilibrium concentrations and partial pressure?
Tue Dec 04, 2018 10:35 pm
Forum: Bronsted Acids & Bases
Topic: HCl Ionized
Replies: 1
Views: 118

### HCl Ionized

Is HCl completely ionized in water and why?
Tue Dec 04, 2018 10:33 pm
Forum: Conjugate Acids & Bases
Topic: Conjugates
Replies: 2
Views: 140

### Conjugates

How do you find the conjugate acid and base for an acid and base? Did we go over this in lecture yet?
Tue Dec 04, 2018 8:22 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted
Replies: 1
Views: 127

### Bronsted

How can you tell if something is a bronsted acid or base? In what way can we explain our answer?
Wed Nov 28, 2018 11:15 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Transition metals
Replies: 1
Views: 84

### Transition metals

Are coordination compounds limited to transition metals in the 4th period or do they include all transition metals?
Wed Nov 28, 2018 11:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Angular Shape
Replies: 3
Views: 138

### Angular Shape

Is angular shape bond angle of 120 degrees or is it slightly less than 120?
Wed Nov 28, 2018 11:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarizability
Replies: 2
Views: 56

### Polarizability

What does it mean to be polarizable and how do you find if one atom is more polarizable than another?
Mon Nov 26, 2018 9:20 am
Forum: Hybridization
Topic: Hybridization
Replies: 2
Views: 93

### Hybridization

Does hybridization have a maximum or highest energy level or can it keep going into other orbitals like the f and g ones?
Mon Nov 26, 2018 9:19 am
Forum: Hybridization
Topic: When to hybridized?
Replies: 6
Views: 179

### When to hybridized?

I'm confused on exactly when hybridization is used and what kind of questions would be asked about it on the exam
Mon Nov 26, 2018 9:18 am
Forum: Hybridization
Topic: Bonds
Replies: 5
Views: 186

### Bonds

What's the difference between sigma and pi bonds and how can we easily distinguish them?
Thu Nov 15, 2018 8:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Vsepr Formula
Replies: 7
Views: 127

### Vsepr Formula

What is the difference between a vsepr formula and Lewis structures? What exactly is a vsepr formula supposed to look like?
Thu Nov 15, 2018 8:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Linear Shape
Replies: 5
Views: 177

### Linear Shape

Is it possible to have linear shape and also have lone pair electrons on the central atom?
Thu Nov 15, 2018 8:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 6th Edition Ch4 Q7
Replies: 2
Views: 136

### 6th Edition Ch4 Q7

How do we know there are different bond angles for SOCl2 and how can we expect the values of these bonds?
Sun Nov 11, 2018 8:59 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: Dipoles and Electronegativity
Replies: 4
Views: 224

### Dipoles and Electronegativity

What is the trend and relation between finding dipoles and electronegativity?
Sun Nov 11, 2018 8:53 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: States of matter and forces
Replies: 3
Views: 207

### States of matter and forces

How can we easily remember which states of matter are associated with which internolecular force?
Sun Nov 11, 2018 8:46 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarization
Replies: 1
Views: 121

### Polarization

What exactly is polarization and how is it measured?
Sun Nov 04, 2018 8:09 pm
Forum: Ionic & Covalent Bonds
Topic: Test bank?
Replies: 9
Views: 1089

### Re: Test bank?

If you search up "Garlic Bread" on chemistry community, there should be a post with a download link to a practice midterm, but I'm not sure there are past exams available.
Sun Nov 04, 2018 8:09 pm
Forum: Electronegativity
Topic: Electronegativity Relations
Replies: 2
Views: 54

### Electronegativity Relations

How is electronegativity related ionization energy and electron affinity specifically?
Sun Nov 04, 2018 8:02 pm
Forum: Lewis Structures
Topic: Double bonds vs. lone pairs
Replies: 5
Views: 585

### Re: Double bonds vs. lone pairs

We know what kind of bond to make when calculating formal charge of each atom. The Lewis structure with the lowest total formal charge is what is ideally wanted.
Sun Oct 28, 2018 9:21 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: d-orbitals
Replies: 1
Views: 91

### Re: d-orbitals

I believe convention is from least to greatest or greatest to least
Ex. - 5, - 4, - 3, - 2, - 1, 0, 1, 2, 3, 4, 5
There are more specifics in naming them but I don't believe we have to know them
Sun Oct 28, 2018 9:14 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Degeneracy
Replies: 7
Views: 276

### Re: Degeneracy

To add on, if orbitals have the same l value, they are said to be degenerate
Sun Oct 28, 2018 9:11 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3d before 4s for Z > 10
Replies: 3
Views: 170

### Re: 3d before 4s for Z > 10

I belive so as long as there is an electron occupying an s-orbital
Sun Oct 21, 2018 1:11 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: p-orbitals
Replies: 1
Views: 42

### p-orbitals

Does anyone know if there is a max to the p-orbital (3p, 5p, etc) and up to which one will be relevant for life sciences?
Sun Oct 21, 2018 1:07 am
Forum: Einstein Equation
Topic: Joules per photon?
Replies: 5
Views: 324

### Re: Joules per photon?

I believe leaving it in just Joules is fine because if not specified, it is assumed to be Joules per photon
Sun Oct 21, 2018 1:04 am
Forum: DeBroglie Equation
Topic: de broglie post module q 34 [ENDORSED]
Replies: 1
Views: 85

### Re: de broglie post module q 34[ENDORSED]

You would use the DeBroglie equation rearranged to $v = \frac{h}{\lambda m}$

Where v=velocity
Planck's Constant, h=6.626x10^-34
m=mass

You can tell if it is reasonable if the velocity is faster than the speed of light or not
Thu Oct 11, 2018 5:49 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra
Replies: 1
Views: 50

### Re: Atomic Spectra

I believe that each line on the atomic spectra is not taken from one H atom, but from multiple H atoms in which different frequencies of light are used on each one to match an energy level that will prompt the electron to emit a photon, thus producing a whole range of lines that we would call it's o...
Thu Oct 11, 2018 5:44 pm
Forum: Properties of Light
Topic: Homework Question 1.15 (6th edition)
Replies: 1
Views: 61

### Re: Homework Question 1.15 (6th edition)

The equation you listed is the correct one to use. The tricky part is recognizing that at 102.6nm, the line observed is a part of the Lyman series This would mean that n_{1}=1 Now that we know what one value of n is, we can find n_{2} by using the formula v=R(\frac{1}{n_{2}^{1}}-\frac{1}{n_{2}^{...
Thu Oct 11, 2018 5:40 pm
Forum: Einstein Equation
Topic: Using einstiens Equation
Replies: 1
Views: 78

### Re: Using einstiens Equation

E is in the unit joules
h is Planck's constant in the unit Joules*Seconds
v is in the unit per second

If we take h*v, then the units are $(joules*s)\frac{1}{s}$
We can see the s or seconds cancel, leaving us with the unit joules that E is in
Fri Oct 05, 2018 12:05 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: 6th Edition Question G5
Replies: 1
Views: 106

### 6th Edition Question G5

In the solution manual, it shows that $\frac{(2.5*10^-3 mol Na^+)(1molNa_{2}CO_{2})}{(.07967mol*L^-1)(2molNa^+)}$ but I don't understand why the term $1molNa_{2}CO_{2}$ is in the numerator and why $2molNa^+$ is in the denominator.
Tue Oct 02, 2018 11:06 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: 6th Edition Question E29b
Replies: 1
Views: 125

### 6th Edition Question E29b

The solutions manual states that "Because there are 2 mol Cl per mole of compound, the number of moles will be twice the amount in part (a)"

I'm wondering why the number of moles is twice the amount in part (a) based on the amount of Cl moles.
Tue Oct 02, 2018 10:56 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: stoichiometric terminology
Replies: 3
Views: 164

### Re: stoichiometric terminology

I believe "formula units" refers to the amount of atoms that are in the 5.15g sample of the compound.