Search found 52 matches

by Cristian Carrasco 1F
Tue Mar 13, 2018 10:36 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 2
Views: 171

Arrhenius Equation

Can someone explain this equation and what is it used to find ?
by Cristian Carrasco 1F
Tue Mar 13, 2018 10:34 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalyst
Replies: 2
Views: 129

Catalyst

How does a catalyst affect the reaction rate ?
by Cristian Carrasco 1F
Tue Mar 13, 2018 10:18 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: mechanisms
Replies: 3
Views: 240

mechanisms

How do you draw mechanisms from rate laws?
by Cristian Carrasco 1F
Tue Mar 13, 2018 10:16 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Increasing Tempt
Replies: 2
Views: 213

Increasing Tempt

How does temperature affect the rate constant?
by Cristian Carrasco 1F
Tue Mar 06, 2018 4:41 pm
Forum: General Rate Laws
Topic: Mechanisms
Replies: 1
Views: 87

Mechanisms

How do you determine the reaction rate law from a mechanism?
by Cristian Carrasco 1F
Tue Mar 06, 2018 4:40 pm
Forum: General Rate Laws
Topic: Elementary reaction rate
Replies: 1
Views: 58

Elementary reaction rate

When finding the elementary reaction rate, do we use the coefficients of the reactants?
by Cristian Carrasco 1F
Tue Mar 06, 2018 4:38 pm
Forum: General Rate Laws
Topic: Half Reaction rate
Replies: 1
Views: 84

Half Reaction rate

How to do you derive the half reaction equation from the integrated ordered reaction?
by Cristian Carrasco 1F
Tue Mar 06, 2018 4:35 pm
Forum: General Rate Laws
Topic: Integrating
Replies: 2
Views: 110

Integrating

How do you integrate a rate law to find out the reaction order?
by Cristian Carrasco 1F
Tue Mar 06, 2018 3:44 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Units for reaction rates
Replies: 2
Views: 146

Units for reaction rates

What are the units for zero, first and second order reaction rates?
by Cristian Carrasco 1F
Tue Mar 06, 2018 3:42 pm
Forum: General Rate Laws
Topic: 15.5
Replies: 2
Views: 73

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 ?
by Cristian Carrasco 1F
Tue Feb 27, 2018 7:27 pm
Forum: General Rate Laws
Topic: Half life
Replies: 3
Views: 127

Half life

how do you calculate the half life of a second order reaction ?
by Cristian Carrasco 1F
Tue Feb 27, 2018 6:41 pm
Forum: General Rate Laws
Topic: Finding reaction rate [ENDORSED]
Replies: 5
Views: 225

Finding reaction rate [ENDORSED]

when solving reaction rate, do we use grams or moles?
by Cristian Carrasco 1F
Tue Feb 27, 2018 6:21 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: 15.3 [ENDORSED]
Replies: 7
Views: 274

15.3 [ENDORSED]

How do you find the rate of formation of given the concentrations?
by Cristian Carrasco 1F
Tue Feb 27, 2018 6:05 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Hw 15.1 [ENDORSED]
Replies: 7
Views: 305

Hw 15.1 [ENDORSED]

for N2+3H2----> 2NH3, would the rate of consumption of N2 to H2 be 1/3?
by Cristian Carrasco 1F
Wed Feb 21, 2018 12:06 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell diagrams
Replies: 2
Views: 77

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?
by Cristian Carrasco 1F
Tue Feb 20, 2018 10:56 pm
Forum: Balancing Redox Reactions
Topic: 14.5
Replies: 1
Views: 95

14.5

in the half reaction Br- -----> BrO3- why is the charge on Br on the right side 5+?
by Cristian Carrasco 1F
Tue Feb 20, 2018 10:11 pm
Forum: Balancing Redox Reactions
Topic: 14.3
Replies: 2
Views: 103

14.3

when doing the half reaction for Mno4- ----> Mn2+ why do we add 5e- to the left side??
by Cristian Carrasco 1F
Sun Feb 11, 2018 11:45 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Enthalpy of fusion [ENDORSED]
Replies: 4
Views: 210

Enthalpy of fusion [ENDORSED]

for problem 2 on the midterm, how would you find the delta H fusion of the ice cream?
by Cristian Carrasco 1F
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: 101

Entropy change due to pressure

When calculating the entropy change in pressure, which R do you use for the formula: nRlnP1/P2?
by Cristian Carrasco 1F
Tue Feb 06, 2018 5:12 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Isothermal expansion
Replies: 2
Views: 123

Isothermal expansion

How do you calculate the entropy change of an isothermal expansion, like problem 9.9??
by Cristian Carrasco 1F
Mon Jan 29, 2018 2:51 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.1 Homework
Replies: 4
Views: 134

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 ?
by Cristian Carrasco 1F
Mon Jan 29, 2018 2:47 pm
Forum: Calculating Work of Expansion
Topic: Irreversible expansion
Replies: 4
Views: 152

Irreversible expansion

For irreversible expansion, why is w=P x delta V used instead of w= -nRt lnV2/V1?
by Cristian Carrasco 1F
Thu Jan 25, 2018 10:12 pm
Forum: Calculating Work of Expansion
Topic: Expanding VS Compressing
Replies: 2
Views: 116

Expanding VS Compressing

If a system is expanding would that be the system doing work? and would Delta U be positive or negative
by Cristian Carrasco 1F
Mon Jan 22, 2018 5:45 pm
Forum: Phase Changes & Related Calculations
Topic: Tempt and phase change
Replies: 1
Views: 75

Tempt and phase change

What formula is used to calculate delta H fusion of water?
by Cristian Carrasco 1F
Mon Jan 22, 2018 5:25 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Enthalpy
Replies: 2
Views: 122

Enthalpy

when calculating heat released in a reactions and using q= MC x delta T, do we use moles or grams for M?
by Cristian Carrasco 1F
Tue Jan 16, 2018 6:50 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Calorimetry
Replies: 2
Views: 154

Calorimetry

How do you set up the equation for the heat of a calorimeter like problem 8.21?
by Cristian Carrasco 1F
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: 146

Work function

when is W positive and when is it negative??
by Cristian Carrasco 1F
Sun Jan 14, 2018 10:33 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Thermochemical equation
Replies: 5
Views: 255

Thermochemical equation

Can someone explain what a thermochemical equation is ?
by Cristian Carrasco 1F
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: 1844

Standard States

How do you know if an element is in its standard state ?
by Cristian Carrasco 1F
Sun Jan 14, 2018 10:25 pm
Forum: Phase Changes & Related Calculations
Topic: Problem 8.29
Replies: 4
Views: 185

Problem 8.29

Which one has greater enthalpy, NO or NO2 and Why?
by Cristian Carrasco 1F
Sat Dec 09, 2017 7:10 pm
Forum: Hybridization
Topic: Paramagnetic vs diamagnetic
Replies: 2
Views: 163

Paramagnetic vs diamagnetic

Can someone explain what paramagnetic vs diamagnetic is and if its going to be on the final?
by Cristian Carrasco 1F
Sat Dec 09, 2017 3:20 pm
Forum: Hybridization
Topic: Ionization energy
Replies: 1
Views: 129

Ionization energy

How to figure out what atom has the greatest first ionization energy??
by Cristian Carrasco 1F
Sat Dec 09, 2017 1:56 pm
Forum: Electronegativity
Topic: Electron Affinity
Replies: 2
Views: 273

Electron Affinity

Which element has the highest electron affinity??
by Cristian Carrasco 1F
Sat Dec 09, 2017 12:23 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand Order
Replies: 2
Views: 217

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.
by Cristian Carrasco 1F
Sat Dec 09, 2017 12:08 am
Forum: Lewis Acids & Bases
Topic: Given PH first
Replies: 4
Views: 311

Given PH first

How would we calculate [H+} if were given the pH??
by Cristian Carrasco 1F
Sat Dec 09, 2017 12:07 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 5
Views: 280

Lone pairs

Do lone pairs affect polarization?
by Cristian Carrasco 1F
Sat Dec 09, 2017 12:05 am
Forum: Naming
Topic: Polydentates
Replies: 4
Views: 347

Polydentates

Can someone explain how to determine whether a coordinated compound is mono,bi,tri dentate???
by Cristian Carrasco 1F
Sat Dec 09, 2017 12:01 am
Forum: Amphoteric Compounds
Topic: Amphoteric [ENDORSED]
Replies: 4
Views: 467

Amphoteric [ENDORSED]

How do you know whether an oxide is an acid, base or amphoteric??
by Cristian Carrasco 1F
Thu Dec 07, 2017 5:40 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Midterm Question
Replies: 2
Views: 278

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.
by Cristian Carrasco 1F
Thu Dec 07, 2017 5:30 pm
Forum: *Shrodinger Equation
Topic: Midterm Question
Replies: 1
Views: 300

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 ...
by Cristian Carrasco 1F
Mon Dec 04, 2017 11:38 pm
Forum: Amphoteric Compounds
Topic: Oxides
Replies: 2
Views: 276

Oxides

How do you know whether an oxide is acidic, basic or amphoteric??
by Cristian Carrasco 1F
Mon Dec 04, 2017 11:34 pm
Forum: Bronsted Acids & Bases
Topic: Proton Transfer Equilbria
Replies: 2
Views: 180

Proton Transfer Equilbria

Can someone explain what the proton transfer equilibria is and how do you find it?
by Cristian Carrasco 1F
Mon Dec 04, 2017 11:08 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Acid and Base
Replies: 5
Views: 278

Conjugate Acid and Base

How do you find the conjugate acid and base? For example, whats the conjugate acid of CH3NH2?
by Cristian Carrasco 1F
Wed Nov 29, 2017 11:32 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi bonds
Replies: 5
Views: 327

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?
by Cristian Carrasco 1F
Wed Nov 29, 2017 5:05 pm
Forum: Naming
Topic: [CO(SO4)(NH3)5]+ [ENDORSED]
Replies: 2
Views: 925

[CO(SO4)(NH3)5]+ [ENDORSED]

can someone explain why cobalt has an oxidation number of three in this coordination compound??
by Cristian Carrasco 1F
Thu Nov 16, 2017 1:26 pm
Forum: Hybridization
Topic: Significance of Hybridization
Replies: 3
Views: 192

Significance of Hybridization

Can someone please explain the importance of hybridization??
by Cristian Carrasco 1F
Thu Nov 16, 2017 1:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar or Non-polar
Replies: 3
Views: 825

Polar or Non-polar

I'm confused on the polarity of CCl2, can someone explain what it is and why ??
by Cristian Carrasco 1F
Tue Nov 07, 2017 8:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Resonance Structure
Replies: 4
Views: 191

Resonance Structure

I'm confused with resonance structure can someone please explain what it is ????
by Cristian Carrasco 1F
Tue Nov 07, 2017 8:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Beryllium Octet Rule
Replies: 6
Views: 1234

Beryllium Octet Rule

Can someone please explain why beryllium does not follow the octet rule in some cases like BeCl2???
by Cristian Carrasco 1F
Tue Oct 24, 2017 8:13 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Wave Functions [ENDORSED]
Replies: 1
Views: 165

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?
by Cristian Carrasco 1F
Fri Oct 13, 2017 7:06 pm
Forum: Properties of Electrons
Topic: Wave Properties of Electrons
Replies: 3
Views: 219

Wave Properties of Electrons

Can someone please explain the difference between diffraction and destructive interference?? And why they are important wave properties of electrons???
by Cristian Carrasco 1F
Thu Oct 12, 2017 4:52 pm
Forum: Properties of Light
Topic: Planck Constant [ENDORSED]
Replies: 8
Views: 434

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.

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