Search found 65 matches
- Tue Jul 30, 2019 5:04 pm
- Forum: Dipole Moments
- Topic: Effect of size [ENDORSED]
- Replies: 7
- Views: 1420
Re: Effect of size [ENDORSED]
so does this have anything to do with electronegativity?
- Tue Jul 30, 2019 4:58 pm
- Forum: Dipole Moments
- Topic: dipole moments
- Replies: 2
- Views: 406
dipole moments
Do dipole moments determine where electron density is greater?
- Sun Jul 28, 2019 9:34 pm
- Forum: Bronsted Acids & Bases
- Topic: (am)
- Replies: 3
- Views: 456
Re: (am)
What is a solvent
- Sun Jul 28, 2019 9:30 pm
- Forum: Lewis Acids & Bases
- Topic: Acids & Bases
- Replies: 4
- Views: 617
Acids & Bases
Can somebody help me understand the correlations between Acids and bases and how to apply them into chemical concepts?
- Tue Jul 16, 2019 2:07 pm
- Forum: Hybridization
- Topic: hybridization
- Replies: 2
- Views: 478
Re: hybridization
Thank You
- Tue Jul 16, 2019 1:39 pm
- Forum: Sigma & Pi Bonds
- Topic: Which bond would break first.
- Replies: 15
- Views: 2680
Re: Which bond would break first.
How would we be able to distinguish between the two? I know pie bonds show polarity, but I need a bit more clarification of sigma bonds>
- Tue Jul 16, 2019 1:05 pm
- Forum: Dipole Moments
- Topic: Charges
- Replies: 1
- Views: 389
Charges
If there are two negative charges, or two positive charges what does that mean in regards to dipole moments?
- Tue Jul 16, 2019 12:37 pm
- Forum: Ionic & Covalent Bonds
- Topic: Homework 3.5
- Replies: 7
- Views: 1051
Re: Homework 3.5
Right...It's because the 5s orbital had already been filled up In Xenon's configuration.
- Tue Jul 16, 2019 12:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity
- Replies: 1
- Views: 329
Polarity
How is polarity determined? Is it via the unequal sharing of electrons?
- Tue Jul 16, 2019 12:10 pm
- Forum: Hybridization
- Topic: hybridization
- Replies: 2
- Views: 478
hybridization
I am having trouble understanding the relationship between electrons and orbitals when trying to identify the hybridization. Can someone please help.
- Thu Jul 11, 2019 1:38 pm
- Forum: SI Units, Unit Conversions
- Topic: Moles mols mol? [ENDORSED]
- Replies: 21
- Views: 9158
Re: Moles mols mol? [ENDORSED]
The concept of moles can be used to measure molecules. Thus, the terms are used interchangeably.
- Thu Jul 11, 2019 1:17 pm
- Forum: Resonance Structures
- Topic: Lewis Structures vs. Resonance
- Replies: 3
- Views: 613
Lewis Structures vs. Resonance
What is the difference between Lewis & Resonance structures?
- Thu Jul 11, 2019 1:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ground State
- Replies: 13
- Views: 1446
Re: Ground State
So (hypothetically) in the event that there is an electron configuration that exceeds 4s1, we would take an electron from the next orbital because the energy would be higher?
- Thu Jul 11, 2019 1:09 pm
- Forum: Lewis Structures
- Topic: Double Bonds [ENDORSED]
- Replies: 4
- Views: 770
Re: Double Bonds [ENDORSED]
There are many resonance structures that correlate with bond formation. However, it is important to make sure that when you create these structures to fulfill the octet rule.
- Thu Jul 11, 2019 1:04 pm
- Forum: Ionic & Covalent Bonds
- Topic: Homework 3.5
- Replies: 7
- Views: 1051
Re: Homework 3.5
I was wondering the same thing because the s and p orbital is before the d orbital, right??
- Thu Jul 11, 2019 1:02 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ground State
- Replies: 13
- Views: 1446
Re: Ground State
I'm not really sure, but I know that it is losing an electron (considering the "+") which means that it is taken out of the s orbital.
- Thu Jul 04, 2019 1:14 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Stoichiometric reactions
- Replies: 5
- Views: 3073
Re: Stoichiometric reactions
This equation is balanced on both sides... Each nitrogen has 2, while each hydrogen has 6 ( 2x3=6). Thus, this equation is not based on equivalence, but rather making sure that each element has the correct coefficients on both sides to get that stable balance.
- Thu Jul 04, 2019 1:03 pm
- Forum: Limiting Reactant Calculations
- Topic: Are these important? [ENDORSED]
- Replies: 3
- Views: 694
Re: Are these important? [ENDORSED]
Can someone explain how to go about solving this. I know that Avogadro's number is used when solving for moles...
- Thu Jul 04, 2019 12:53 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molar Mass vs. Atomic Weight
- Replies: 7
- Views: 1322
Re: Molar Mass vs. Atomic Weight
Molar mass is the sum of the atomic mass (the elements listed on the periodic table).
- Thu Jul 04, 2019 12:42 pm
- Forum: Significant Figures
- Topic: Determining sig figs
- Replies: 10
- Views: 2397
Re: Determining sig figs
Will the number of sig figs determine if our answer is correct or incorrect?
- Thu Jul 04, 2019 12:37 pm
- Forum: Properties of Light
- Topic: wavelength
- Replies: 11
- Views: 1803
Re: wavelength
I have the same question... Does amplitude refer to the peak of the wave?
- Thu Jul 04, 2019 12:33 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Equations
- Replies: 6
- Views: 784
Re: Balancing Equations
I remember going over a problem in discussion that required algebra in order tp balance equations... Can someone help me to understand this concept?
- Fri Jun 28, 2019 9:25 pm
- Forum: Einstein Equation
- Topic: E=hv [ENDORSED]
- Replies: 52
- Views: 18272
Re: E=hv [ENDORSED]
I know that E represents the energy of the photon, while the equation itself represents electron removal... In lecture today Professor Lavelle showed us an example of the electron removal from a metal. My question is can electrons be removed anywhere?
- Fri Jun 28, 2019 9:08 pm
- Forum: Properties of Light
- Topic: limiting reagents
- Replies: 4
- Views: 914
Re: limiting reagents
Why would you just choose one of the products?
- Fri Jun 28, 2019 9:01 pm
- Forum: Properties of Light
- Topic: HW 1.55A
- Replies: 2
- Views: 539
Re: HW 1.55A
With problems like these, are we always supposed to convert to meters?
- Thu Jun 27, 2019 1:04 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Homework Problem G.13 in Fundamentals
- Replies: 3
- Views: 517
Re: Homework Problem G.13 in Fundamentals
I'm also confused with how to solve this... When it says "how many moles of nitrogen", does that mean we have to find the mass of nitrogen and then multiply it by Avogadro's number?? Please help.
- Thu Jun 27, 2019 12:23 pm
- Forum: SI Units, Unit Conversions
- Topic: Properties
- Replies: 1
- Views: 442
Properties
Why is volume an extensive property, while density is intensive?
- Thu Jun 27, 2019 12:17 pm
- Forum: Empirical & Molecular Formulas
- Topic: Formulas
- Replies: 10
- Views: 2309
Formulas
Can someone please explain how we find the number to multiply by when making the molecular formula?
- Mon Mar 11, 2019 5:38 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Ideal Gas C
- Replies: 5
- Views: 784
Re: Ideal Gas C
CHEM 14B Lover wrote:For ideal gases, why is Cp 5/2R and Cv 3/2R
What does R refer to?
- Mon Mar 11, 2019 5:37 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Cp vs Cv
- Replies: 7
- Views: 1084
Re: Cp vs Cv
Constant volume, and constant pressure... The problem should contain enough information to determine which one you should use.
- Mon Mar 11, 2019 5:34 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies
- Replies: 8
- Views: 853
Re: Bond Enthalpies
Yes, thats right !
- Mon Mar 11, 2019 5:33 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Delta U
- Replies: 5
- Views: 793
Delta U
Just for clarification... the reaction is isothermal if delta U equals 0?
- Mon Mar 11, 2019 5:26 pm
- Forum: Ideal Gases
- Topic: Cell Diagram/Ecell
- Replies: 8
- Views: 932
Cell Diagram/Ecell
how do we determine which is the anode and which is the cathode?
- Mon Mar 11, 2019 5:15 pm
- Forum: Balancing Redox Reactions
- Topic: oxidizing agent and reducing agent
- Replies: 15
- Views: 1328
Re: oxidizing agent and reducing agent
If the oxidation number is greater in the product, then it lost electrons (oxidized). If the oxidation number is less, then it gained electrons (reduced).
- Mon Mar 11, 2019 5:09 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation number?
- Replies: 12
- Views: 7364
Re: Oxidation number?
He is referring to the groups and their charges on the periodic table.
- Mon Mar 11, 2019 5:07 pm
- Forum: Balancing Redox Reactions
- Topic: Short hand notation
- Replies: 8
- Views: 837
Re: Short hand notation
A salt bridge is used to connect the oxidation and reduction half-cells of a galvanic cell.
- Mon Mar 11, 2019 4:59 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ka2
- Replies: 1
- Views: 202
Ka2
What is Ka2, in simple terms?
- Mon Mar 11, 2019 10:48 am
- Forum: Ideal Gases
- Topic: Water
- Replies: 13
- Views: 1056
Re: Water
When will water become a gas or solid?
- Mon Mar 11, 2019 10:43 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ignoring x
- Replies: 16
- Views: 3299
Re: ignoring x
X can be ignored when k is less than 1x10^-3
- Mon Mar 11, 2019 10:40 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Injecting noble gasses
- Replies: 7
- Views: 775
Re: Injecting noble gasses
Nope, there won't be a change in the equilibrium constant.
- Mon Mar 11, 2019 10:38 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 3
- Views: 363
Le Chatelier's Principle
What does this principle refer to? Is it true that it predicts the change in equilibria?
- Mon Mar 11, 2019 10:34 am
- Forum: Ideal Gases
- Topic: 5% rule
- Replies: 12
- Views: 3422
Re: 5% rule
What is the 5% rule, and what does it refer to?
- Mon Mar 11, 2019 10:32 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: increasing pressure, what happens to concentration?
- Replies: 10
- Views: 2524
Re: increasing pressure, what happens to concentration?
when pressure increases, the reaction is attracted to the side with fewer moles.
- Mon Mar 11, 2019 10:29 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium Constanst
- Replies: 3
- Views: 374
Equilibrium Constanst
Is it true that k is unitless when dividing products by reactants ?
- Mon Mar 11, 2019 10:27 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Final Exam
- Replies: 23
- Views: 1769
Re: Final Exam
Is there anyone doing study groups for the final ?
- Mon Mar 11, 2019 10:22 am
- Forum: Ideal Gases
- Topic: Ideal gases
- Replies: 5
- Views: 438
Ideal gases
Are we just to assume that a gas is an ideal gas ?
- Mon Mar 11, 2019 10:21 am
- Forum: Ideal Gases
- Topic: ICE
- Replies: 8
- Views: 658
ICE
f the value of K is less than 10^-3, what can we assume about the value ?
- Sun Mar 03, 2019 7:15 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Cell diagram
- Replies: 4
- Views: 467
Cell diagram
What are cell diagrams used for and what are its components?
- Fri Feb 08, 2019 11:09 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Delta H
- Replies: 7
- Views: 1210
Delta H
What does this refer to, and what’s the equation for it?
- Fri Feb 08, 2019 11:06 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond
- Replies: 2
- Views: 294
Bond
What should I know about bond angles ?
- Fri Feb 08, 2019 8:32 am
- Forum: Administrative Questions and Class Announcements
- Topic: Tutoring? [ENDORSED]
- Replies: 121
- Views: 253540
Re: Tutoring? [ENDORSED]
Are there any one on one sessions ?
- Fri Feb 08, 2019 8:29 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Systems
- Replies: 2
- Views: 324
Systems
What is the difference between open and closed systems ?
- Fri Feb 01, 2019 12:01 pm
- Forum: Student Social/Study Group
- Topic: Lecture Notes (1/30)
- Replies: 4
- Views: 418
Re: Lecture Notes (1/30)
Thanks!!
- Fri Feb 01, 2019 11:59 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: CP/V
- Replies: 2
- Views: 304
CP/V
What are CP and CP formulas?
- Fri Feb 01, 2019 11:57 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpies
- Replies: 5
- Views: 490
Enthalpies
What's does enthalpies refer to?
- Thu Jan 24, 2019 6:39 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: PV= RnT
- Replies: 2
- Views: 606
PV= RnT
What does the formula PV=RnT refer to?
- Thu Jan 24, 2019 6:36 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Acid and bases
- Replies: 1
- Views: 152
Acid and bases
Does Acid and bases have anything to do with equilibrium?
- Thu Jan 24, 2019 6:33 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pH
- Replies: 9
- Views: 1045
pH
What is pH and how do I find it?
- Wed Jan 16, 2019 9:30 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Conjugates
- Replies: 5
- Views: 467
Re: Conjugates
Does anyone know what the conjugate seesaw refers to ?
- Wed Jan 16, 2019 9:28 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Acid & Bases
- Replies: 1
- Views: 149
Acid & Bases
What are acids & bases? What are conjugate acid & bases ?
- Wed Jan 16, 2019 9:25 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: States
- Replies: 1
- Views: 133
States
difference between liquids, solids, gases, and water in concentration ?
- Wed Jan 16, 2019 9:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Number of questions on test one [ENDORSED]
- Replies: 39
- Views: 21622
Re: Number of questions on test one [ENDORSED]
905092269 wrote:I was wondering how many questions test one has? I was also wondering how many points will be taken off for simple mistakes (sig figs, units, etc.)?
When will the test take place? Does it cover both equilibrium and acids and bases?
- Wed Jan 16, 2019 9:20 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE
- Replies: 5
- Views: 491
ICE
What is X on an ice table ?
- Wed Jan 16, 2019 9:19 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pH
- Replies: 5
- Views: 362
pH
Does anyone know how to solve pH?
- Wed Jan 16, 2019 9:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Concentration
- Replies: 4
- Views: 416
Concentration
What's the difference between Q & K