## Search found 55 matches

Thu Mar 07, 2019 9:57 pm
Forum: Second Order Reactions
Topic: Half life of a second order reaction
Replies: 1
Views: 159

### Half life of a second order reaction

Is the half life of a second order reaction affected by the initial concentration?
Thu Mar 07, 2019 9:56 pm
Forum: First Order Reactions
Topic: Half life of a first order reaction
Replies: 3
Views: 153

### Half life of a first order reaction

Does the concentration of a first order reaction not affect the half life?
Thu Mar 07, 2019 9:55 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Rate Orders
Replies: 4
Views: 177

### Reaction Rate Orders

Is the order of a reaction determined by the highest order of a reactant or the combined orders of the reactants?
Mon Mar 04, 2019 8:19 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Enot
Replies: 2
Views: 152

### Enot

Why can Enot values of a cell be added together even though they are not state functions?
Mon Mar 04, 2019 8:18 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Concentration cells
Replies: 6
Views: 378

### Concentration cells

What defines a concentration cell?
Mon Mar 04, 2019 7:42 pm
Forum: Zero Order Reactions
Topic: 7A 15
Replies: 4
Views: 187

### 7A 15

How do you know that molecule C is a zero order reaction? Also how do you calculate the degree for each reaction?
Mon Feb 25, 2019 11:25 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Standard Gibbs free energy
Replies: 1
Views: 81

### Standard Gibbs free energy

Does standard Gibbs free energy correlate to Delta G over moles?
Mon Feb 25, 2019 11:24 am
Forum: Calculating Work of Expansion
Topic: -DeltanRT
Replies: 2
Views: 322

### -DeltanRT

can - delta n RT be used to replace -PDeltaV
Mon Feb 25, 2019 11:22 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Negative Delta G
Replies: 2
Views: 99

### Negative Delta G

Why does a negative Delta G correlate to a spontaneous reaction?
Mon Feb 25, 2019 11:10 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: salt bridge vs porous disk
Replies: 2
Views: 101

### salt bridge vs porous disk

What is the difference between a salt bridge and a porous disk?
Mon Feb 25, 2019 11:09 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Delta G
Replies: 2
Views: 117

### Delta G

In the equation DeltaG= -nFE does the n refer to delta n of a reaction?
Mon Feb 25, 2019 11:05 am
Forum: Balancing Redox Reactions
Topic: Redox in Basic compounds
Replies: 2
Views: 126

### Redox in Basic compounds

What extra steps do we have to take to balance redox reactions in basic solutions?
Sun Feb 10, 2019 10:38 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isochoric
Replies: 3
Views: 172

### Isochoric

If a reaction is isochoric is the work 0
Sun Feb 10, 2019 10:29 pm
Forum: Calculating Work of Expansion
Topic: Pv=nrT
Replies: 2
Views: 109

### Pv=nrT

can the equation w=PdeltaV be replaced with deltaNrt?
Sun Feb 10, 2019 10:25 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity
Replies: 4
Views: 154

### Heat Capacity

With the equation q=mcDeltaT be replaced with q=ncDeltaT simply by replacing grams with moles?
Sun Feb 03, 2019 10:50 pm
Forum: Calculating Work of Expansion
Topic: Different ways to derive work
Replies: 3
Views: 94

### Different ways to derive work

Will we only need to calculate problems with work using the Pressure*change in volume definition of work, or will we ever need to calculate using force*distance?
Sun Feb 03, 2019 10:44 pm
Forum: Calculating Work of Expansion
Topic: Different types of pressure
Replies: 1
Views: 83

### Different types of pressure

Do we need to memorize the constants to convert between Torr, Atm, and Bar?
Sun Feb 03, 2019 10:38 pm
Forum: Calculating Work of Expansion
Topic: L*atm
Replies: 2
Views: 111

### L*atm

Normally when calculating work we end up with the unit L*atm and then to convert it to Joules we use a constant 101.325. Do we need to memorize this constant?
Sun Jan 27, 2019 9:04 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: closed vs isolated
Replies: 14
Views: 345

### closed vs isolated

What is the difference between a closed and an isolated system? Is an isolated system just sealed?
Sun Jan 27, 2019 8:58 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U vs Delta H
Replies: 6
Views: 315

### Delta U vs Delta H

What is the difference between Delta U and Delta H?
Sun Jan 27, 2019 8:56 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Question 4D 15 7th edition
Replies: 1
Views: 109

### Question 4D 15 7th edition

Why is the answer -312 instead of +312? Does it have to do with that we were given the entropy of combustion instead of the entropy of formation?
Sun Jan 20, 2019 10:34 pm
Forum: Calculating the pH of Salt Solutions
Topic: Identifying which part of the salt does not affect PH
Replies: 1
Views: 239

### Identifying which part of the salt does not affect PH

When looking at the chemical formula of a salt is there any quick way to tell which part of the salt is not present in the chemical reaction and therefore does not affect PH.
Sun Jan 20, 2019 10:28 pm
Forum: Polyprotic Acids & Bases
Topic: Question 6E.3 7th edition
Replies: 2
Views: 354

### Question 6E.3 7th edition

The question states "ignoring second deprotonations only when the approximation is justified. How do we know when its justified?
Sun Jan 20, 2019 10:26 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Quadratic method for weak acids and bases
Replies: 1
Views: 93

### Quadratic method for weak acids and bases

The quadratic method only has to be used if the Ke value is less than 10^-3, but if the Ka value is greater than 10^-3 then we just assume the acid is a strong acid and is completely dissociated. Therefore is there ever a time we have to use the quadratic method for weak acids and bases?
Sun Jan 13, 2019 9:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Question 5I 19
Replies: 2
Views: 106

### Question 5I 19

How do you calculate how many moles of I2 and HI are left over from the information given about 60% of H2 being used up in the reaction?
Sun Jan 13, 2019 9:13 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium composition, estimation method vs quadratic method
Replies: 1
Views: 45

### Equilibrium composition, estimation method vs quadratic method

Is there any way to know when we can use the estimation method to calculate equilibrium composition?
Sun Jan 13, 2019 9:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Question 5G
Replies: 3
Views: 347

### Question 5G

How do you calculate the partial pressure of the reactants and products at equilibrium for part c?
Sun Dec 09, 2018 8:08 pm
Forum: Biological Examples
Topic: Iron in myoglobin [ENDORSED]
Replies: 2
Views: 2066

### Iron in myoglobin[ENDORSED]

Why does the iron in myoglobin only bond to one O atom and not 2?
Sun Dec 09, 2018 8:01 pm
Forum: Naming
Topic: naming polydentate ligands
Replies: 2
Views: 352

### naming polydentate ligands

Do all polydentate ligands use the prefixes bis, tris, etc or just the ones that already have di or tri in their name?
Sun Dec 09, 2018 7:59 pm
Forum: Resonance Structures
Topic: Resonance of CH3COOH
Replies: 1
Views: 1174

### Resonance of CH3COOH

Does the structure CH3COOH have resonance because there are two Lewis structures that are correct, but the H atom can only be on one O atom at a time?
Sun Dec 02, 2018 9:47 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Bases for final
Replies: 1
Views: 250

### Bases for final

Are there any common bases that need to be memorized for the final?
Sun Dec 02, 2018 9:45 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids for final
Replies: 2
Views: 130

### Acids for final

Are there any common Acids that need to be memorized for the final?
Sun Dec 02, 2018 9:40 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand names
Replies: 3
Views: 213

### Ligand names

For the final do we have to memorize all of the common ligand names?
Sun Nov 18, 2018 7:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecules with more than 2 different elements
Replies: 3
Views: 138

### Molecules with more than 2 different elements

Is there a rule that states when a molecule has more than 2 elements in it the molecule becomes polar?
Sun Nov 18, 2018 7:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polar molecules
Replies: 2
Views: 123

### polar molecules

Why do some molecules such as AX3E molecules only have polar forms?
Sun Nov 18, 2018 7:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Model formation
Replies: 2
Views: 99

### Model formation

Are there any VESPER shapes that can form from two different types of Lewis structures? For instance is it possible for Ax3 E1 and AX5 E2 to form the same shape?
Sun Nov 11, 2018 8:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Difference in models
Replies: 2
Views: 112

### Difference in models

What causes a molecule to either form into a Trigonal planar, Trigonal pyramid, or a T-shape?
Sun Nov 11, 2018 8:44 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarization of cation's
Replies: 2
Views: 98

### Polarization of cation's

Do cations become more polarization power with a higher positive charge and smaller atom? Basically in the opposite way of an anion.
Sun Nov 11, 2018 8:41 pm
Forum: Resonance Structures
Topic: Bond lengths
Replies: 1
Views: 146

### Bond lengths

If a molecule has a 130pm bond length and a 150pm bond length and has resonance is the total bond length 140pm?
Sun Nov 04, 2018 8:49 pm
Forum: Resonance Structures
Topic: Resonance with formal charge
Replies: 6
Views: 340

### Resonance with formal charge

If a molecule has a formal charge that favors one form of a Lewis structure over another does the molecule still have resonance?
Sun Nov 04, 2018 8:46 pm
Forum: Ionic & Covalent Bonds
Topic: Identifying ionic compounds
Replies: 1
Views: 116

### Identifying ionic compounds

Some molecules such as (NH4)OH look like a covalent molecule but are actually an ionic molecule. How do you identify this as an ionic compound?
Sun Nov 04, 2018 8:37 pm
Forum: Octet Exceptions
Replies: 16
Views: 864

In a molecule with a radical how do you identify which element the radical is on?
Sun Oct 28, 2018 11:41 pm
Forum: Ionic & Covalent Bonds
Topic: Question 2B.11
Replies: 1
Views: 83

### Question 2B.11

How do you determine the central atoms and the order of the atoms in general?
Sun Oct 28, 2018 11:39 pm
Forum: Ionic & Covalent Bonds
Topic: 2B.7
Replies: 3
Views: 214

### 2B.7

How does the element E have 10 valence electrons?
Sun Oct 28, 2018 11:36 pm
Forum: Ionic & Covalent Bonds
Topic: Question 2B.3 part d
Replies: 2
Views: 100

### Question 2B.3 part d

For the BrF3 molecule Br has more than 8 valence electrons. I was wondering why this occurs
Sun Oct 21, 2018 12:20 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Atomic number and orbitals [ENDORSED]
Replies: 1
Views: 112

### Atomic number and orbitals[ENDORSED]

On the perodic table the elemtents all fit togeter into s orbital, p orbital, and d orbital sections. I was wondering is this in anyway to do with the atomic number of the atoms and the number of valence electrons?
Sun Oct 21, 2018 12:17 am
Forum: Photoelectric Effect
Topic: spectral lines
Replies: 6
Views: 246

### spectral lines

I've seen two versions of the same formula: one is v = R(1/n1^2 -1/n2^2). The other is 1/wavelength = R(1/n1^2 -1/n2^2). I was just wondering which of these two equations is correct and what's its main use is for
Sun Oct 21, 2018 12:13 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals and periodic table
Replies: 1
Views: 84

### Orbitals and periodic table

So on the periodic table I noticed that the elements all line nicely into groups that share the same sub shells. I was wondering why this occurs and about how this affects the elements properties
Sun Oct 21, 2018 12:13 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals and periodic table
Replies: 1
Views: 113

### Orbitals and periodic table

So on the periodic table I noticed that the elements all line nicely into groups that share the same sub shells. I was wondering why this occurs and about how this affects the elements properties
Sun Oct 14, 2018 10:02 pm
Forum: Photoelectric Effect
Topic: 1B.7
Replies: 2
Views: 148

### 1B.7

Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589nm. How much energy is emitted by 5.00 mg of sodium atom emitting this wavelength?
Sun Oct 14, 2018 9:53 pm
Forum: DeBroglie Equation
Topic: 1B.15
Replies: 4
Views: 123

### 1B.15

The velocity of an electron that is emitted from a metallic surface by a photon is 3.6*10^3 kn/s. How do you find the wavelength of the electron?
Sun Oct 14, 2018 9:50 pm
Forum: DeBroglie Equation
Topic: 1B.9
Replies: 3
Views: 138

### 1B.9

A lamp is rated at 32W emits violet light of wavelength 420nm. How many photons of violet light can the lamp generate in 2.0s? How many moles of photons are emitted in that time interval?
How do you find the amount of moles using Watts?
Sun Oct 07, 2018 8:56 pm
Forum: Limiting Reactant Calculations
Topic: Question M 9 and net ionic equations
Replies: 1
Views: 68

### Question M 9 and net ionic equations

Copper (II) nitrate reacts with sodium hydroxide to produce a precipitate of light blue copper(II) hydroxide. (a) Write the net ionic equation for the reaction. I was just wondering if anyone knows how to create net ionic equations because I am very rusty with them. If anyone could explain how to in...
Sun Oct 07, 2018 8:44 pm
Forum: Limiting Reactant Calculations
Topic: Question M11
Replies: 2
Views: 241

### Question M11

I understand how to do the first reaction P4 + 3O2 = P4O6. I found the limiting reactant to be P4. I was just wondering how I calculate how much oxygen is left for the second reaction
Sun Oct 07, 2018 8:39 pm
Forum: Properties of Light
Topic: Question 1A3.
Replies: 1
Views: 43

### Question 1A3.

"What happens when the frequency of electromagnetic radiation decreases? " The answer is C "The extent of the change in the electrical field at a given point decreases.". I do not understand why c is correct. I thought the answer was A. Answer A says the "speed of radiation ...