Search found 67 matches
- Thu Mar 14, 2019 10:22 am
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Modelks of Reactions
- Replies: 1
- Views: 1149
Modelks of Reactions
In the 7th edition for topic 7D how much do we need to know about models of reactions?
- Mon Mar 11, 2019 3:20 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram and Ecell [ENDORSED]
- Replies: 29
- Views: 115548
Re: Cell Diagram and Ecell [ENDORSED]
how can you tell which is the anode and which is the cathode?
- Mon Mar 11, 2019 3:19 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration cell textbook question 6N. 3A self test [ENDORSED]
- Replies: 7
- Views: 108222
Re: Concentration cell textbook question 6N. 3A self test [ENDORSED]
so its correct that the anode is always on the left of the concentration cell right?
- Mon Mar 11, 2019 3:17 pm
- Forum: *Electrophiles
- Topic: final
- Replies: 7
- Views: 1912
final
how evenly is the final going to be distributed among topics?
- Wed Mar 06, 2019 2:57 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Volume and Temperature
- Replies: 2
- Views: 341
Volume and Temperature
do we need to know what happens if both the entropy and temperature changes in a reaction?
- Wed Mar 06, 2019 2:55 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Arrhenius Equation
- Replies: 1
- Views: 336
Arrhenius Equation
In the Arrhenius equation, what is the A?
- Wed Mar 06, 2019 2:54 pm
- Forum: Zero Order Reactions
- Topic: Reaction orders
- Replies: 2
- Views: 463
Reaction orders
How can you tell the difference between a first/second/and third order reaction?
- Tue Feb 26, 2019 3:41 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: galvanic/voltaic
- Replies: 2
- Views: 322
galvanic/voltaic
whats the difference between an galvanic and a voltaic cell?
- Tue Feb 26, 2019 3:41 pm
- Forum: Balancing Redox Reactions
- Topic: common charges
- Replies: 2
- Views: 287
common charges
are there any common charges that we should know besides the fact that oxygen is 2-?
- Tue Feb 26, 2019 3:27 pm
- Forum: Balancing Redox Reactions
- Topic: basic
- Replies: 3
- Views: 378
basic
When balancing basic reactions, how can you tell how many -OH should be added?
- Tue Feb 19, 2019 12:46 pm
- Forum: General Rate Laws
- Topic: Rate constant units
- Replies: 6
- Views: 1270
Re: Rate constant units
It's helpful to just write all your units out and then see which ones cancel!
- Tue Feb 19, 2019 12:45 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Activation energy
- Replies: 8
- Views: 872
Re: Activation energy
The activation energy is the energy required for a reaction to happen!
- Tue Feb 19, 2019 12:42 pm
- Forum: General Rate Laws
- Topic: test 3
- Replies: 6
- Views: 649
test 3
Do we know which sections test 3 will be on yet?
- Mon Feb 11, 2019 4:17 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: linear molecules vs nonlinear molecules [ENDORSED]
- Replies: 1
- Views: 508
linear molecules vs nonlinear molecules [ENDORSED]
will we be expected to know the vsepr shapes for molecules to determine whether they are linear or not?
- Mon Feb 11, 2019 4:12 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Positional Disorder
- Replies: 1
- Views: 275
Positional Disorder
what is the difference between positional disorder and other types of disorder?
- Mon Feb 11, 2019 4:05 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: systems [ENDORSED]
- Replies: 2
- Views: 628
systems [ENDORSED]
is there a correlation between open/closed/isolated systems and exothermic/endothermic systems?
- Thu Feb 07, 2019 1:12 pm
- Forum: Environment, Fossil Fuels, Alternative Fuels
- Topic: midterm
- Replies: 3
- Views: 1293
midterm
Is this information about the environment and fossil fuels included on the midterm?
- Thu Feb 07, 2019 1:10 pm
- Forum: Administrative Questions and Class Announcements
- Topic: How to find my posts
- Replies: 163
- Views: 183645
Re: How to find my posts
You have to first click on the class your'e in and the topics to be able to post!
- Thu Feb 07, 2019 1:05 pm
- Forum: Phase Changes & Related Calculations
- Topic: sections
- Replies: 4
- Views: 532
sections
Which sections specifically are we going to be tested on on the midterm?
- Mon Jan 28, 2019 1:23 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 3
- Views: 565
Le Chatelier's Principle
does le chatelier's principle apply to all chemical reactions or only those at equilibrium?
- Mon Jan 28, 2019 1:23 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 2
- Views: 410
Le Chatelier's Principle
What effect does Le Chatelier's principle have when the pressure is increased in a reaction that has an even amount of moles on either side?
- Mon Jan 28, 2019 1:22 pm
- Forum: Ideal Gases
- Topic: sre
- Replies: 5
- Views: 607
sre
What is a standard reaction enthalpy?
- Mon Jan 28, 2019 1:22 pm
- Forum: Phase Changes & Related Calculations
- Topic: Properties
- Replies: 2
- Views: 347
Properties
What's the difference between an extensive and intensive property?
- Mon Jan 28, 2019 1:21 pm
- Forum: Phase Changes & Related Calculations
- Topic: SI Unit
- Replies: 2
- Views: 306
SI Unit
Is this official SI unit joules or kilojoules?
- Mon Jan 28, 2019 1:21 pm
- Forum: Phase Changes & Related Calculations
- Topic: Heat Capacity
- Replies: 10
- Views: 970
Heat Capacity
Whats the difference between heat capacity and molar heat capacity?
- Sat Jan 19, 2019 10:15 pm
- Forum: Ideal Gases
- Topic: kc vs kp
- Replies: 19
- Views: 3548
kc vs kp
can kp also be used in place of kc?
- Sat Jan 19, 2019 10:14 pm
- Forum: Ideal Gases
- Topic: ice
- Replies: 4
- Views: 606
ice
what's the difference between the ice tables for acid base reactions and for regular equilibrium reactions?
- Thu Jan 17, 2019 1:28 pm
- Forum: Ideal Gases
- Topic: office hours
- Replies: 1
- Views: 298
office hours
will office hours this coming monday and other sessions be cancelled because of mlk day?
- Fri Jan 11, 2019 5:16 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE
- Replies: 2
- Views: 214
ICE
What does ICE stand for?
- Fri Jan 11, 2019 5:16 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kp vs Kc
- Replies: 6
- Views: 632
Kp vs Kc
Is one of Kp or Kc more important?
- Fri Jan 11, 2019 5:15 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equations
- Replies: 6
- Views: 546
Equations
What is the difference between Kc and Kp?
- Sat Dec 08, 2018 11:51 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 4
- Views: 564
VSEPR
For something with the formula AXE3, would the bond angles be 180 because the molecular shape is linear?
- Tue Dec 04, 2018 7:32 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Definitions of Acids and Bases
- Replies: 1
- Views: 388
Definitions of Acids and Bases
What is the most commonly used and accepted definition of acids and bases?
- Tue Dec 04, 2018 7:31 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Acids and Bases
- Replies: 4
- Views: 792
Acids and Bases
What is a method for identifying the salts that are produced from the acid- base neutralization reactions?
- Mon Dec 03, 2018 10:36 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: acids and bases
- Replies: 3
- Views: 362
acids and bases
should we memorize the strong acids??
Naming
For the final, should we probably memorize some of the common names of polyatomic ions for the naming?
- Sat Dec 01, 2018 11:11 am
- Forum: Naming
- Topic: Naming [ENDORSED]
- Replies: 1
- Views: 317
Naming [ENDORSED]
For the final, should we probably memorize some of the common names of polyatomic ions for the naming?
- Mon Nov 26, 2018 5:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 1
- Views: 1067
Bond Angles
How can you tell when bond angles are going to be "slightly less than" 109.5/120, etc.??
- Mon Nov 26, 2018 4:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test [ENDORSED]
- Replies: 1
- Views: 333
Test [ENDORSED]
On the test if they asked us to draw the Lewis Structure, would the Lewis Structure that we've been drawing be fine or should we draw a Lewis structure that shows the angles??
- Mon Nov 26, 2018 3:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 1
- Views: 266
VSEPR
For the molecule thionyl chloride (SOCl2), why is the shape trigonal pyramidal? Shouldn't the shape be T-shaped/trigonal bipyramidal?
- Mon Nov 26, 2018 3:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Shape
- Replies: 4
- Views: 497
Determining Shape
For the compound ClO2+, how is the arrangement trigonal planar while the shape is angular?
- Mon Nov 19, 2018 6:42 pm
- Forum: Bond Lengths & Energies
- Topic: double bonds vs. single bonds
- Replies: 5
- Views: 942
double bonds vs. single bonds
Are double bonds or single bonds more stable?
- Mon Nov 19, 2018 6:41 pm
- Forum: Bond Lengths & Energies
- Topic: VSEPR
- Replies: 6
- Views: 2045
VSEPR
how can you find the shape of GeF4 molecule?
- Mon Nov 19, 2018 6:39 pm
- Forum: Bond Lengths & Energies
- Topic: Ball and Stick
- Replies: 2
- Views: 1808
Ball and Stick
How does the ball and stick model change and the angles between the bonds change?
- Tue Nov 13, 2018 1:14 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 4
- Views: 486
Formal Charge
Which is more important when it comes to stability- making sure that the formal charge is zero on everything or making sure that the octet rule is satisfied?
- Tue Nov 13, 2018 1:13 pm
- Forum: Octet Exceptions
- Topic: Exceptions
- Replies: 10
- Views: 1401
Exceptions
How should we know which ones are exceptions?
- Tue Nov 13, 2018 1:13 pm
- Forum: Electronegativity
- Topic: Polarity
- Replies: 3
- Views: 308
Polarity
When we draw Lewis structures of polarizable things, should we label within the Lewis structure which ends is more polar?
- Thu Nov 08, 2018 1:32 pm
- Forum: Electronegativity
- Topic: Polarity
- Replies: 1
- Views: 233
Polarity
How are polarity and resonance connected? Do they vary in any way with each other?
- Thu Nov 08, 2018 1:32 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 3
- Views: 511
Resonance Structures
Are resonance structures generally stronger/more stable than other structures?
- Thu Nov 08, 2018 1:31 pm
- Forum: Ionic & Covalent Bonds
- Topic: Chemical Bonds
- Replies: 5
- Views: 568
Chemical Bonds
Which bonds are longer, ionic or covalent? Or is the comparison not relevant?
- Mon Oct 29, 2018 8:12 pm
- Forum: DeBroglie Equation
- Topic: Uncertainty
- Replies: 4
- Views: 571
Uncertainty
For everyday objects, is it true that the uncertainty of any object is nonsignificant compared to how big the object is usually?
- Mon Oct 29, 2018 8:11 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Energy Levels
- Replies: 2
- Views: 436
Energy Levels
Why does energy increase when an electron goes up an energy level?
- Mon Oct 29, 2018 8:11 pm
- Forum: Trends in The Periodic Table
- Topic: Coulombic potential energy
- Replies: 2
- Views: 465
Coulombic potential energy
How do you write an expression for total coulombic potential energy and what does total coulombic potential energy mean?
- Mon Oct 22, 2018 6:23 pm
- Forum: Properties of Electrons
- Topic: Orbitals
- Replies: 5
- Views: 810
Orbitals
How many orbitals are present in the 4p subshell? How can you find this out?
- Mon Oct 22, 2018 6:22 pm
- Forum: Properties of Electrons
- Topic: Predicting Nodal Planes
- Replies: 2
- Views: 443
Predicting Nodal Planes
How do you predict the number of nodal planes expected for a 4f orbital?
- Mon Oct 22, 2018 6:18 pm
- Forum: Properties of Electrons
- Topic: Nodal surfaces
- Replies: 3
- Views: 490
Nodal surfaces
What is the difference between a radial node and an angular nodal surface?
- Mon Oct 22, 2018 6:16 pm
- Forum: Properties of Electrons
- Topic: Electron Energy
- Replies: 3
- Views: 490
Electron Energy
Why does the energy of the electron change when the hydrogen atom undergoes a transition from the 1s orbital to the 2p orbital because it says that "there are one 2s- and three 2p- orbitals in the shell and in hydrogen they all have the same energy"?
- Wed Oct 17, 2018 1:21 pm
- Forum: Properties of Light
- Topic: Series
- Replies: 4
- Views: 486
Series
Will we have to know the classifications of the series such as the differences between the Balmer and Lyman series for the test?
- Wed Oct 17, 2018 1:17 pm
- Forum: Properties of Light
- Topic: Rydberg formula
- Replies: 8
- Views: 837
Rydberg formula
How do you solve this problem: "In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line". I'm not really sure where to st...
- Wed Oct 17, 2018 1:12 pm
- Forum: Properties of Light
- Topic: Electromagnetic Radiation
- Replies: 3
- Views: 357
Electromagnetic Radiation
Why is it that when frequency decreases, the extent of change in the electrical field at a given point also decreases?
- Sat Oct 13, 2018 12:49 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect Initial Purpose
- Replies: 4
- Views: 454
Re: Photoelectric Effect Initial Purpose
The purpose of the photoelectric effect was to explore how light was transmitted. They believed that light was transmitted based on the intensity of the light that can be seen. However, it was discovered that light is actually transmitted based on the frequency and wavelength of the electron light w...
- Sat Oct 13, 2018 12:46 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reagent
- Replies: 10
- Views: 1630
Re: Limiting Reagent
There is no difference between there being two limiting reagants and just one. You still find the mole ratio and the reagant with the smallest mole ratio is the limiting reagant.
- Fri Oct 12, 2018 8:09 pm
- Forum: DeBroglie Equation
- Topic: Measurable wave length properties
- Replies: 3
- Views: 345
Re: Measurable wave length properties
It depends on the wavelength- if the wavelength is too small, it will not be measurable. Around 10 x ^-18 nm is when wavelengths become measurable. Smaller than that, the wavelengths are not measurable.
- Sun Oct 07, 2018 7:00 pm
- Forum: Limiting Reactant Calculations
- Topic: Theoretical Yield
- Replies: 7
- Views: 972
Re: Theoretical Yield
The theoretical yield is always larger than the actual yield because the theoretical yield is the calculated yield. When we calculate the yield, we use perfect numbers and assume that the reaction will go perfectly as planned. However, in the real world, there are many different factors involved in ...
- Sun Oct 07, 2018 12:03 am
- Forum: Balancing Chemical Reactions
- Topic: Balancing reactions tips
- Replies: 29
- Views: 2229
Re: Balancing reactions tips
I balance the equation based on whether the elements are in a compound or not! I balance the elements in compounds first, because the elements not in compounds or in compounds of just themselves (ex: O2) are easier to change around later.
- Sun Oct 07, 2018 12:00 am
- Forum: Empirical & Molecular Formulas
- Topic: Calculation/Finding the Empirical Formula
- Replies: 2
- Views: 480
Re: Calculation/Finding the Empirical Formula
It is neither an educated guess nor an approximation- using the method of solving the empirical formula that we found in class, you should be able to find the exact empirical formula. While the numbers may not be exact, they should be relatively close (within a tenth). Since the numbers are within a...
- Sun Oct 07, 2018 12:00 am
- Forum: Empirical & Molecular Formulas
- Topic: Calculation/Finding the Empirical Formula
- Replies: 2
- Views: 480
Re: Calculation/Finding the Empirical Formula
It is neither an educated guess nor an approximation- using the method of solving the empirical formula that we found in class, you should be able to find the exact empirical formula. While the numbers may not be exact, they should be relatively close (within a tenth). Since the numbers are within a...