Search found 54 matches
- Sun Dec 08, 2019 9:23 am
- Forum: Lewis Acids & Bases
- Topic: Strong Acid
- Replies: 2
- Views: 299
Re: Strong Acid
H4O would have a +2 charge, which is very unstable, therefore it would be more willing to give off those extra hydrogens to become more stable (hence making it a stronger acid until it is in its neutral state water).
- Sun Dec 08, 2019 9:18 am
- Forum: Electronegativity
- Topic: Noble Gases
- Replies: 40
- Views: 12908
Re: Noble Gases
Kevin Liu 1J wrote:Noble gases are not included in the trend for electronegativity.
They are usually not included. But Xenon, since it has such a large atomic radius, has very weak control over its valance electrons and therefore can bind with other elements.
- Thu Dec 05, 2019 3:45 pm
- Forum: Bronsted Acids & Bases
- Topic: Homework Problem 6A 17 c and d
- Replies: 1
- Views: 163
Homework Problem 6A 17 c and d
Why are the molecules As2O3 and BiO3 Amphoteric?
- Thu Dec 05, 2019 3:44 pm
- Forum: Bronsted Acids & Bases
- Topic: 6A.17b
- Replies: 5
- Views: 360
Re: 6A.17b
S 1C wrote:Wait if it's an acidic oxide why is the answer basic...? Am i missing something or getting caught up in the wordiness?
The answer is that it would be Acidic.
- Wed Dec 04, 2019 11:57 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Equilibrium sign?
- Replies: 3
- Views: 203
Equilibrium sign?
When would you use an equilibrium sign instead of just a regular arrow when writing chemical equations?
- Wed Dec 04, 2019 11:51 pm
- Forum: Conjugate Acids & Bases
- Topic: HW 6A.3 Part C
- Replies: 2
- Views: 311
HW 6A.3 Part C
For this problem you are prompted to write the chemical equation for the proton transfer equilibria of the following acids in aqueous solution and identify the conjugate acid-base pair.
Part C is H2PO4-
Why is the pair H2PO4- and HPO4-2 instead of H2PO4- and H3PO4?
Part C is H2PO4-
Why is the pair H2PO4- and HPO4-2 instead of H2PO4- and H3PO4?
- Wed Nov 27, 2019 4:19 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Strengths of forces
- Replies: 4
- Views: 305
Re: Strengths of forces
If you are referring to diethyl ether to having dipole-dipole intermolecular forces and water to have hydrogen bonding, then water (hydrogen bonding) would have a stronger intermolecular force because hydrogen bonds are stronger than dipole-dipole bonds. Thank you this is what I was asking! Do you ...
- Wed Nov 27, 2019 4:17 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Test Questions?
- Replies: 2
- Views: 218
Test Questions?
How do you think Professor Lavelle would test us on Coordination Compounds? I feel there is a possibility of naming, but other than that I am unsure of how it would be tested.
- Wed Nov 27, 2019 4:15 pm
- Forum: Naming
- Topic: Simple Definitions
- Replies: 1
- Views: 178
Simple Definitions
I am really confused about the definitions in coordination compounds. What is a coordination compound and ligand.
- Wed Nov 27, 2019 4:12 pm
- Forum: Lewis Acids & Bases
- Topic: Difference between Bronsted and Lewis Acid?
- Replies: 6
- Views: 1074
Difference between Bronsted and Lewis Acid?
What is the difference between a Bronsted and Lewis Acid?
- Wed Nov 27, 2019 4:08 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Relative Acidity (Noting a strong acid)
- Replies: 1
- Views: 165
Relative Acidity (Noting a strong acid)
In lecture, Professor Lavelle noted that a longer bond length meant a stronger acid but then went on to explain the example of Tricholoracetic Acid and noted that when exchanging Cl for H the acid got stronger through the inductive effect, even though the bond length is shorter. Could somebody clari...
- Wed Nov 20, 2019 10:02 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: pi bonding
- Replies: 3
- Views: 266
Re: pi bonding
A pi bond is not two bonds but it does overlap in two places because there is a nodal plane. Since pi bonds overlap side to side there will be overlap above and below the internuclear axis but this is still considered one bond. How would you know what is in the nodal plane and where the internuclea...
- Wed Nov 20, 2019 10:01 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Boiling Points and IMF Strength
- Replies: 6
- Views: 484
Boiling Points and IMF Strength
Is there a connection between boiling point and IMF Strength? If so, why or why not?
- Wed Nov 20, 2019 9:59 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Ionic
- Replies: 6
- Views: 476
Re: Ionic
Ionic is an intramolecular force (between ions), intermolecular forces refer to forces between molecules and ions such as dipole-dipole or hydrogen bonding.
- Wed Nov 20, 2019 9:55 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Strengths of forces
- Replies: 4
- Views: 305
Re: Strengths of forces
If you are referring to diethyl ether to having dipole-dipole intermolecular forces and water to have hydrogen bonding, then water (hydrogen bonding) would have a stronger intermolecular force because hydrogen bonds are stronger than dipole-dipole bonds.
- Wed Nov 20, 2019 9:48 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Boiling Points
- Replies: 7
- Views: 369
Re: Boiling Points
Jorge Ramirez_4H wrote:So the stronger the forces are the higher the boiling point?
Yes, the stronger the forces, the more energy is needed to vaporize them, therefore, the stronger the forces the higher the boiling point.
- Fri Nov 15, 2019 11:50 am
- Forum: Bond Lengths & Energies
- Topic: Calculating Radius Length?
- Replies: 1
- Views: 148
Calculating Radius Length?
How would you calculate the radius length when trying to find the interaction potential energy?
- Fri Nov 15, 2019 11:46 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pair Repulsion?
- Replies: 5
- Views: 392
Lone Pair Repulsion?
Why do regions of lone pairs of electrons repel each other more than lone-bond or bond-bond regions?
- Fri Nov 15, 2019 11:44 am
- Forum: Dipole Moments
- Topic: Shape of Molecules affect boiling point?
- Replies: 7
- Views: 929
Shape of Molecules affect boiling point?
Why do rod-shaped molecules have a higher boiling point than spherical shapes molecules?
- Fri Nov 15, 2019 11:43 am
- Forum: Dipole Moments
- Topic: 3 Hydrocarbon Example?
- Replies: 1
- Views: 192
3 Hydrocarbon Example?
What was Professor Lavelle trying to explain when showing us the 3 hydrocarbon examples and how they are liquid, viscous, and waxy? What concept was it?
- Fri Nov 15, 2019 11:41 am
- Forum: Dipole Moments
- Topic: Interaction Potential Energy Equation?
- Replies: 2
- Views: 217
Interaction Potential Energy Equation?
I understand for Dispersion forces, interactions are always present and attractive, but could somebody explain what the Interaction Potential energy is and what the variables in the equation represent (the Ep is proportional to -(symbol1) times (symbol 2) over radius to the sixth power?
- Mon Nov 04, 2019 10:04 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarisability vs Polarizing Power
- Replies: 15
- Views: 1182
Re: Polarisability vs Polarizing Power
Polarizability power refers to an atom's ability to cause large distortions in the electron cloud while polarizability is an atom's likeliness to undergo a large distortion.
- Mon Nov 04, 2019 10:01 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polar Covalent VS Ionic
- Replies: 11
- Views: 683
Re: Polar Covalent VS Ionic
You can look at an elements electronegativity level. The more electronegative, the more uneven the distribution, and therefore has ionic character.
- Mon Nov 04, 2019 9:40 pm
- Forum: Photoelectric Effect
- Topic: Details about the photoelectric experiment
- Replies: 3
- Views: 282
Re: Details about the photoelectric experiment
At all the review sessions I had gone to including Professor Lavelle's, they did not specify about conditions such as vacuums, therefore, I believe that you shouldn't worry about having to know those concepts. Just how to do the computational calculations.
- Mon Nov 04, 2019 9:38 pm
- Forum: Ionic & Covalent Bonds
- Topic: Question 2D.3
- Replies: 2
- Views: 216
Re: Question 2D.3
Since the molecule also has symmetry in its structure and electron distribution, the polar forces cancel each other and therefore is considered nonpolar.
- Mon Nov 04, 2019 9:37 pm
- Forum: *Shrodinger Equation
- Topic: Shrodinger Equation Relationships? [ENDORSED]
- Replies: 1
- Views: 848
Shrodinger Equation Relationships? [ENDORSED]
One of Lavelle's topics under Quantum world was "Understand the relationship between Schrodinger's equation (H psi =Epsi), wave functions, and orbitals.
Could somebody explain the Hpsi=Epsi relationship and how that relates to wave functions and orbitals?
Could somebody explain the Hpsi=Epsi relationship and how that relates to wave functions and orbitals?
- Wed Oct 30, 2019 8:10 pm
- Forum: Properties of Electrons
- Topic: 1B. 15C [ENDORSED]
- Replies: 4
- Views: 275
Re: 1B. 15C [ENDORSED]
To find the wavelength you use DeBroglie's equation which is wavelength=planks constant/(massxvelocity) and when you plug in the given values the wavelength should come out to be 2.0x10-10m.
- Wed Oct 30, 2019 8:07 pm
- Forum: Properties of Electrons
- Topic: 1A.11
- Replies: 2
- Views: 283
Re: 1A.11
All you need to know is that for the Lyman series the final energy level is n=1, the Balmer series the final energy level is n=2, the Paschen series the final energy level is n=3, and the Brackett series the final energy level is n=4. This can be solved by using quantum equations.
- Wed Oct 30, 2019 8:04 pm
- Forum: Properties of Electrons
- Topic: Mass of electron in 1B.15
- Replies: 3
- Views: 188
Re: Mass of electron in 1B.15
The mass of the electron is 9.1095x10-31 kg. This value will be given to you on the reference sheet for the test so don't worry about it!
- Wed Oct 30, 2019 8:02 pm
- Forum: Properties of Electrons
- Topic: 1E1
- Replies: 2
- Views: 156
Re: 1E1
Energy can be measured by using n (energy level), therefore, when the electron moves from the 1st to the 2nd energy level, the energy increases because higher energy levels have a greater energy.
- Wed Oct 30, 2019 7:55 pm
- Forum: Lewis Structures
- Topic: 4s and 3d
- Replies: 4
- Views: 194
Re: 4s and 3d
Since the 4s subshell is farther than the 3d subshell, the electrons would be removed from the shell farthest from the nucleus, therefore taking it out of the 4s rather than the 3d. That is why the ion has a 3d10 configuration rather than a 4s23d8
- Tue Oct 22, 2019 8:31 pm
- Forum: Photoelectric Effect
- Topic: Work Function?
- Replies: 7
- Views: 553
Work Function?
Where does the work function come in any of the chemistry problems so far? I do not understand what the work function is and how it relates to any formula so far.
- Tue Oct 22, 2019 8:30 pm
- Forum: Properties of Electrons
- Topic: Electron with wavelike/particle like properties?
- Replies: 1
- Views: 203
Electron with wavelike/particle like properties?
I am really confused on what it means for an electron to have wavelike or particle-like properties. Could somebody explain which an electron is like or give an example/reference to support one side?
- Tue Oct 22, 2019 8:27 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: f- orbitals?
- Replies: 7
- Views: 215
Re: f- orbitals?
905416023 wrote:I too am confused about this. On problem 1d.25, there is mention of a g subshell.
That question was referring to "Which of the following does not exsits" to show that the 4g subshell does not exists (which is the answer).
- Tue Oct 22, 2019 8:25 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers
- Replies: 7
- Views: 275
Re: Quantum Numbers
The spin would be denoted with the 4th Quantum number (+/- 1/2). Another tip is to remember to use the Pauli Exclusion Principal and Hund's Rule when drawing it out. Hope that helps.
- Tue Oct 22, 2019 8:21 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: 1E. 1
- Replies: 4
- Views: 316
Re: 1E. 1
All of these also increase for a hydrogen atom as well. I think the important part of the question is understanding why these increase in a hydrogen atom versus a lithium atom. For a, b, and c, (all properties that apply to single-electron systems), the reason for the increase is the same between h...
- Tue Oct 22, 2019 8:16 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Homewrok
- Replies: 2
- Views: 167
Re: Homewrok
It would be regarded as one question.
- Mon Oct 21, 2019 12:40 am
- Forum: Properties of Electrons
- Topic: 1B. 7 Homework help
- Replies: 3
- Views: 185
Re: 1B. 7 Homework help
thank you so much I figured it out
- Sun Oct 20, 2019 4:54 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Unfamiliar Terminology in Questions 1D 15-17
- Replies: 2
- Views: 90
Unfamiliar Terminology in Questions 1D 15-17
When the question refers to finding the principal, orbital, and magnetic quantum numbers, what is each referring to?
- Sat Oct 19, 2019 3:19 pm
- Forum: DeBroglie Equation
- Topic: 25.
- Replies: 4
- Views: 197
Re: 25.
I was looking at the solutions manual and the value for h is not planks constant (6.626x10-34) but some other value. Can somebody explain why it is different?
- Sat Oct 19, 2019 2:47 pm
- Forum: DeBroglie Equation
- Topic: 1B. 19 Homework Help
- Replies: 1
- Views: 96
1B. 19 Homework Help
For number 19, we need to use the mass for a proton and neutron. What values would we use for those equations? Thanks
- Sat Oct 19, 2019 12:47 pm
- Forum: Properties of Electrons
- Topic: 1B. 7 Homework help
- Replies: 3
- Views: 185
1B. 7 Homework help
I am confused on where to start for homework problem 1B parts a - c. Am I supposed to convert the wavelength to energy? I guess I'm also confused about what the question is asking. Could someone help? Thanks?
- Tue Oct 08, 2019 10:14 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Chemical Equations (Question L.35)
- Replies: 3
- Views: 150
Re: Balancing Chemical Equations (Question L.35)
Sophia Shaka 3L wrote:From the Comments and Errors file found on the Chem 14A site:
"L.35 in the textbook question:
In the third reaction step the compound "FeBr2" needs to be "Fe3Br8"."
Could you explain why that is?
- Tue Oct 08, 2019 9:57 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Chemical Equations (Question L.35)
- Replies: 3
- Views: 150
Balancing Chemical Equations (Question L.35)
I was having trouble with question L.35. I have to balance the following equation
FeBr2 + Na2CO3 = NaBr + CO2 + Fe3O4
Thanks!
FeBr2 + Na2CO3 = NaBr + CO2 + Fe3O4
Thanks!
- Tue Oct 08, 2019 8:36 pm
- Forum: Balancing Chemical Reactions
- Topic: Combustion
- Replies: 17
- Views: 1095
Re: Combustion
Combustion is another word for burning. In a combustion reaction, the fuel (usually a hydrocarbon or other related molecule), burns with O2 gas. Combustion simply means reacting with O2 and could yield products such as water and carbon dioxide.
- Tue Oct 08, 2019 8:34 pm
- Forum: Significant Figures
- Topic: Sig Fig Decimal
- Replies: 10
- Views: 504
Re: Sig Fig Decimal
They are the same amount of sig figs! Since they are the same amount of numbers 114 and 114. they are equal in sig figs.
- Tue Oct 08, 2019 6:08 pm
- Forum: Significant Figures
- Topic: Answer being a tad bit off
- Replies: 8
- Views: 570
Re: Answer being a tad bit off
I am not sure about grading, but rather use unrounded values until the end to ensure you come out with the correct answer. Your answer may be a tad off because you may have been using rounded values throughout.
- Tue Oct 08, 2019 6:06 pm
- Forum: Significant Figures
- Topic: Clarification with sig figs
- Replies: 6
- Views: 234
Re: Clarification with sig figs
That is correct. You would not round values until the end and then the end value would be rounded to three sig figs.
- Tue Oct 08, 2019 6:03 pm
- Forum: Significant Figures
- Topic: Do we use molar mass ?
- Replies: 8
- Views: 263
Re: Do we use molar mass ?
In most cases, you would not use the number of sig figs in the molar mass, but instead, use the number of sig figs in your given amounts in the question.
- Mon Sep 30, 2019 10:27 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: c or m as concentration
- Replies: 4
- Views: 1933
Re: c or m as concentration
Capital M is usually used to reference molarity while c is another variable used in other equations.
- Mon Sep 30, 2019 10:24 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: What does dilution mean in a chemistry problem?
- Replies: 8
- Views: 899
Re: What does dilution mean in a chemistry problem?
Yes! Dilution would be adding more solvent (usually an aqueous solution such as water) while keeping the solute amount the same, therefore, changing the molarity of the solution.
- Mon Sep 30, 2019 10:23 pm
- Forum: Balancing Chemical Reactions
- Topic: Combustion Equation
- Replies: 21
- Views: 2861
Re: Combustion Equation
Another tip for balancing combustion equations would be that if you end up with a 1/2 coefficient, multiply all the coefficients by 2 to get the balanced equation.
- Mon Sep 30, 2019 10:18 pm
- Forum: Empirical & Molecular Formulas
- Topic: Empirical Formula
- Replies: 7
- Views: 425
Re: Empirical Formula
I learned this simple trick in my high school Chemistry class.
1. Percent to mass (change the percent sign into a grams sign)
2. Mass to Mole (Convert mass to moles using molar mass)
3. Divide by Small (divide by the smallest number)
4. Times to whole (times to get whole numbers)
1. Percent to mass (change the percent sign into a grams sign)
2. Mass to Mole (Convert mass to moles using molar mass)
3. Divide by Small (divide by the smallest number)
4. Times to whole (times to get whole numbers)
- Mon Sep 30, 2019 10:14 pm
- Forum: SI Units, Unit Conversions
- Topic: Calculator Question
- Replies: 13
- Views: 776
Calculator Question
I was a little confused reading the syllabus. What versions of the Texas Instrument calculators are we allowed to use on tests and exams?