## Search found 52 matches

Tue Mar 13, 2018 10:36 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 2
Views: 280

### Arrhenius Equation

Can someone explain this equation and what is it used to find ?
Tue Mar 13, 2018 10:34 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalyst
Replies: 2
Views: 211

### Catalyst

How does a catalyst affect the reaction rate ?
Tue Mar 13, 2018 10:18 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: mechanisms
Replies: 3
Views: 345

### mechanisms

How do you draw mechanisms from rate laws?
Tue Mar 13, 2018 10:16 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Increasing Tempt
Replies: 2
Views: 282

### Increasing Tempt

How does temperature affect the rate constant?
Tue Mar 06, 2018 4:41 pm
Forum: General Rate Laws
Topic: Mechanisms
Replies: 1
Views: 138

### Mechanisms

How do you determine the reaction rate law from a mechanism?
Tue Mar 06, 2018 4:40 pm
Forum: General Rate Laws
Topic: Elementary reaction rate
Replies: 1
Views: 88

### Elementary reaction rate

When finding the elementary reaction rate, do we use the coefficients of the reactants?
Tue Mar 06, 2018 4:38 pm
Forum: General Rate Laws
Topic: Half Reaction rate
Replies: 1
Views: 126

### Half Reaction rate

How to do you derive the half reaction equation from the integrated ordered reaction?
Tue Mar 06, 2018 4:35 pm
Forum: General Rate Laws
Topic: Integrating
Replies: 2
Views: 151

### Integrating

How do you integrate a rate law to find out the reaction order?
Tue Mar 06, 2018 3:44 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Units for reaction rates
Replies: 9
Views: 312

### Units for reaction rates

What are the units for zero, first and second order reaction rates?
Tue Mar 06, 2018 3:42 pm
Forum: General Rate Laws
Topic: 15.5
Replies: 2
Views: 116

### 15.5

In hw problem 15.5, for part a why is .44 moles x L -1 multiplied by 1/3 instead of 3 for the reaction rate of oxygen ?
Tue Feb 27, 2018 7:27 pm
Forum: General Rate Laws
Topic: Half life
Replies: 3
Views: 234

### Half life

how do you calculate the half life of a second order reaction ?
Tue Feb 27, 2018 6:41 pm
Forum: General Rate Laws
Topic: Finding reaction rate [ENDORSED]
Replies: 5
Views: 379

### Finding reaction rate[ENDORSED]

when solving reaction rate, do we use grams or moles?
Tue Feb 27, 2018 6:21 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: 15.3 [ENDORSED]
Replies: 7
Views: 422

### 15.3[ENDORSED]

How do you find the rate of formation of given the concentrations?
Tue Feb 27, 2018 6:05 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Hw 15.1 [ENDORSED]
Replies: 7
Views: 469

### Hw 15.1[ENDORSED]

for N2+3H2----> 2NH3, would the rate of consumption of N2 to H2 be 1/3?
Wed Feb 21, 2018 12:06 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell diagrams
Replies: 2
Views: 123

### Cell diagrams

How are the cell diagrams layed out can someone explain ? What goes on the left of the salt bridge and what goes on the right and the metal?
Tue Feb 20, 2018 10:56 pm
Forum: Balancing Redox Reactions
Topic: 14.5
Replies: 1
Views: 127

### 14.5

in the half reaction Br- -----> BrO3- why is the charge on Br on the right side 5+?
Tue Feb 20, 2018 10:11 pm
Forum: Balancing Redox Reactions
Topic: 14.3
Replies: 2
Views: 166

### 14.3

when doing the half reaction for Mno4- ----> Mn2+ why do we add 5e- to the left side??
Sun Feb 11, 2018 11:45 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Enthalpy of fusion [ENDORSED]
Replies: 4
Views: 328

### Enthalpy of fusion[ENDORSED]

for problem 2 on the midterm, how would you find the delta H fusion of the ice cream?
Tue Feb 06, 2018 5:21 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy change due to pressure
Replies: 2
Views: 148

### Entropy change due to pressure

When calculating the entropy change in pressure, which R do you use for the formula: nRlnP1/P2?
Tue Feb 06, 2018 5:12 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Isothermal expansion
Replies: 2
Views: 187

### Isothermal expansion

How do you calculate the entropy change of an isothermal expansion, like problem 9.9??
Mon Jan 29, 2018 2:51 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.1 Homework
Replies: 4
Views: 212

### 9.1 Homework

question: A human body generates heat at the rate of about 100W. (1W 1J s-1) a. what rate does your body heat generate entropy in your surroundings, taken to be at 20 C b. how much entropy each day? c. would entropy be greater or less if in a room kept at 30 C? What equation do you use to solve this ?
Mon Jan 29, 2018 2:47 pm
Forum: Calculating Work of Expansion
Topic: Irreversible expansion
Replies: 4
Views: 260

### Irreversible expansion

For irreversible expansion, why is w=P x delta V used instead of w= -nRt lnV2/V1?
Thu Jan 25, 2018 10:12 pm
Forum: Calculating Work of Expansion
Topic: Expanding VS Compressing
Replies: 2
Views: 171

### Expanding VS Compressing

If a system is expanding would that be the system doing work? and would Delta U be positive or negative
Mon Jan 22, 2018 5:45 pm
Forum: Phase Changes & Related Calculations
Topic: Tempt and phase change
Replies: 1
Views: 121

### Tempt and phase change

What formula is used to calculate delta H fusion of water?
Mon Jan 22, 2018 5:25 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Enthalpy
Replies: 2
Views: 153

### Enthalpy

when calculating heat released in a reactions and using q= MC x delta T, do we use moles or grams for M?
Tue Jan 16, 2018 6:50 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calorimetry
Replies: 2
Views: 181

### Calorimetry

How do you set up the equation for the heat of a calorimeter like problem 8.21?
Tue Jan 16, 2018 6:41 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Work function
Replies: 4
Views: 181

### Work function

when is W positive and when is it negative??
Sun Jan 14, 2018 10:33 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Thermochemical equation
Replies: 5
Views: 389

### Thermochemical equation

Can someone explain what a thermochemical equation is ?
Sun Jan 14, 2018 10:31 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard States
Replies: 3
Views: 5090

### Standard States

How do you know if an element is in its standard state ?
Sun Jan 14, 2018 10:25 pm
Forum: Phase Changes & Related Calculations
Topic: Problem 8.29
Replies: 4
Views: 262

### Problem 8.29

Which one has greater enthalpy, NO or NO2 and Why?
Sat Dec 09, 2017 7:10 pm
Forum: Hybridization
Topic: Paramagnetic vs diamagnetic
Replies: 2
Views: 206

### Paramagnetic vs diamagnetic

Can someone explain what paramagnetic vs diamagnetic is and if its going to be on the final?
Sat Dec 09, 2017 3:20 pm
Forum: Hybridization
Topic: Ionization energy
Replies: 1
Views: 151

### Ionization energy

How to figure out what atom has the greatest first ionization energy??
Sat Dec 09, 2017 1:56 pm
Forum: Electronegativity
Topic: Electron Affinity
Replies: 2
Views: 361

### Electron Affinity

Which element has the highest electron affinity??
Sat Dec 09, 2017 12:23 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand Order
Replies: 2
Views: 255

### Re: Ligand Order

I would say just write it in alphabetical order since they will give you the name of the compound in alphabetical order.
Sat Dec 09, 2017 12:08 am
Forum: Lewis Acids & Bases
Topic: Given PH first
Replies: 4
Views: 396

### Given PH first

How would we calculate [H+} if were given the pH??
Sat Dec 09, 2017 12:07 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 5
Views: 386

### Lone pairs

Do lone pairs affect polarization?
Sat Dec 09, 2017 12:05 am
Forum: Naming
Topic: Polydentates
Replies: 4
Views: 422

### Polydentates

Can someone explain how to determine whether a coordinated compound is mono,bi,tri dentate???
Sat Dec 09, 2017 12:01 am
Forum: Amphoteric Compounds
Topic: Amphoteric [ENDORSED]
Replies: 4
Views: 582

### Amphoteric[ENDORSED]

How do you know whether an oxide is an acid, base or amphoteric??
Thu Dec 07, 2017 5:40 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Midterm Question
Replies: 2
Views: 335

### Midterm Question

I know the formula to solve this but I'm confused on how to solve it ?

Find the uncertainty in the position of a marble of mass 1.5 g given that it’s speed is
known to within ± 0.55 m.s-1.
Thu Dec 07, 2017 5:30 pm
Forum: *Shrodinger Equation
Topic: Midterm Question
Replies: 1
Views: 359

### Midterm Question

Can someone please explain how to solve this question?? Dr. Discovery has recently found an Alien civilization. It seems that the aliens are using an experimental setup similar to the photoelectric experiment (effect) to provide energy for their everyday life. Fortunately, in class we discussed the ...
Mon Dec 04, 2017 11:38 pm
Forum: Amphoteric Compounds
Topic: Oxides
Replies: 2
Views: 305

### Oxides

How do you know whether an oxide is acidic, basic or amphoteric??
Mon Dec 04, 2017 11:34 pm
Forum: Bronsted Acids & Bases
Topic: Proton Transfer Equilbria
Replies: 2
Views: 259

### Proton Transfer Equilbria

Can someone explain what the proton transfer equilibria is and how do you find it?
Mon Dec 04, 2017 11:08 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Acid and Base
Replies: 5
Views: 366

### Conjugate Acid and Base

How do you find the conjugate acid and base? For example, whats the conjugate acid of CH3NH2?
Wed Nov 29, 2017 11:32 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi bonds
Replies: 5
Views: 485

### Sigma and Pi bonds

Can someone tell me whats the importance of sigma and pi bonds and how we determine how many of each do we have?
Wed Nov 29, 2017 5:05 pm
Forum: Naming
Topic: [CO(SO4)(NH3)5]+ [ENDORSED]
Replies: 2
Views: 2434

### [CO(SO4)(NH3)5]+[ENDORSED]

can someone explain why cobalt has an oxidation number of three in this coordination compound??
Thu Nov 16, 2017 1:26 pm
Forum: Hybridization
Topic: Significance of Hybridization
Replies: 3
Views: 285

### Significance of Hybridization

Can someone please explain the importance of hybridization??
Thu Nov 16, 2017 1:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar or Non-polar
Replies: 3
Views: 1645

### Polar or Non-polar

I'm confused on the polarity of CCl2, can someone explain what it is and why ??
Tue Nov 07, 2017 8:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance Structure
Replies: 4
Views: 249

### Resonance Structure

I'm confused with resonance structure can someone please explain what it is ????
Tue Nov 07, 2017 8:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Beryllium Octet Rule
Replies: 6
Views: 3206

### Beryllium Octet Rule

Can someone please explain why beryllium does not follow the octet rule in some cases like BeCl2???
Tue Oct 24, 2017 8:13 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Wave Functions [ENDORSED]
Replies: 1
Views: 188

### Wave Functions[ENDORSED]

Can someone help me in this problem???

1.48 What is the highest-energy photon that can be absorbed by a ground-state hydrogen atom without causing ionization? (b) What is the wavelength of this radiation? (c) To what region of the electromagnetic spectrum does this photon belong?
Fri Oct 13, 2017 7:06 pm
Forum: Properties of Electrons
Topic: Wave Properties of Electrons
Replies: 3
Views: 304

### Wave Properties of Electrons

Can someone please explain the difference between diffraction and destructive interference?? And why they are important wave properties of electrons???
Thu Oct 12, 2017 4:52 pm
Forum: Properties of Light
Topic: Planck Constant [ENDORSED]
Replies: 8
Views: 671

### Re: Planck Constant[ENDORSED]

I would say 6.626 x 10^-34 would be best because its precise but Lavelle said they will be given to us on tests.