Search found 54 matches

by 905385366
Sun Dec 08, 2019 9:23 am
Forum: Lewis Acids & Bases
Topic: Strong Acid
Replies: 2
Views: 133

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).
by 905385366
Sun Dec 08, 2019 9:18 am
Forum: Electronegativity
Topic: Noble Gases
Replies: 40
Views: 1391

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.
by 905385366
Thu Dec 05, 2019 3:45 pm
Forum: Bronsted Acids & Bases
Topic: Homework Problem 6A 17 c and d
Replies: 1
Views: 31

Homework Problem 6A 17 c and d

Why are the molecules As2O3 and BiO3 Amphoteric?
by 905385366
Thu Dec 05, 2019 3:44 pm
Forum: Bronsted Acids & Bases
Topic: 6A.17b
Replies: 5
Views: 69

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.
by 905385366
Wed Dec 04, 2019 11:57 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Equilibrium sign?
Replies: 1
Views: 49

Equilibrium sign?

When would you use an equilibrium sign instead of just a regular arrow when writing chemical equations?
by 905385366
Wed Dec 04, 2019 11:51 pm
Forum: Conjugate Acids & Bases
Topic: HW 6A.3 Part C
Replies: 1
Views: 40

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?
by 905385366
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: 71

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 ...
by 905385366
Wed Nov 27, 2019 4:17 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Test Questions?
Replies: 2
Views: 72

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.
by 905385366
Wed Nov 27, 2019 4:15 pm
Forum: Naming
Topic: Simple Definitions
Replies: 1
Views: 48

Simple Definitions

I am really confused about the definitions in coordination compounds. What is a coordination compound and ligand.
by 905385366
Wed Nov 27, 2019 4:12 pm
Forum: Lewis Acids & Bases
Topic: Difference between Bronsted and Lewis Acid?
Replies: 6
Views: 84

Difference between Bronsted and Lewis Acid?

What is the difference between a Bronsted and Lewis Acid?
by 905385366
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: 41

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...
by 905385366
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: 53

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...
by 905385366
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: 68

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.
by 905385366
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: 71

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.
by 905385366
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: 64

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.
by 905385366
Fri Nov 15, 2019 11:50 am
Forum: Bond Lengths & Energies
Topic: Calculating Radius Length?
Replies: 1
Views: 37

Calculating Radius Length?

How would you calculate the radius length when trying to find the interaction potential energy?
by 905385366
Fri Nov 15, 2019 11:46 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair Repulsion?
Replies: 5
Views: 80

Lone Pair Repulsion?

Why do regions of lone pairs of electrons repel each other more than lone-bond or bond-bond regions?
by 905385366
Fri Nov 15, 2019 11:44 am
Forum: Dipole Moments
Topic: Shape of Molecules affect boiling point?
Replies: 7
Views: 159

Shape of Molecules affect boiling point?

Why do rod-shaped molecules have a higher boiling point than spherical shapes molecules?
by 905385366
Fri Nov 15, 2019 11:43 am
Forum: Dipole Moments
Topic: 3 Hydrocarbon Example?
Replies: 1
Views: 40

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?
by 905385366
Fri Nov 15, 2019 11:41 am
Forum: Dipole Moments
Topic: Interaction Potential Energy Equation?
Replies: 2
Views: 63

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?
by 905385366
Mon Nov 04, 2019 10:04 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarisability vs Polarizing Power
Replies: 15
Views: 299

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.
by 905385366
Mon Nov 04, 2019 10:01 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polar Covalent VS Ionic
Replies: 11
Views: 200

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.
by 905385366
Mon Nov 04, 2019 9:40 pm
Forum: Photoelectric Effect
Topic: Details about the photoelectric experiment
Replies: 3
Views: 87

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.
by 905385366
Mon Nov 04, 2019 9:38 pm
Forum: Ionic & Covalent Bonds
Topic: Question 2D.3
Replies: 2
Views: 69

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.
by 905385366
Mon Nov 04, 2019 9:37 pm
Forum: *Shrodinger Equation
Topic: Shrodinger Equation Relationships? [ENDORSED]
Replies: 1
Views: 258

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?
by 905385366
Wed Oct 30, 2019 8:10 pm
Forum: Properties of Electrons
Topic: 1B. 15C [ENDORSED]
Replies: 4
Views: 135

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.
by 905385366
Wed Oct 30, 2019 8:07 pm
Forum: Properties of Electrons
Topic: 1A.11
Replies: 2
Views: 68

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.
by 905385366
Wed Oct 30, 2019 8:04 pm
Forum: Properties of Electrons
Topic: Mass of electron in 1B.15
Replies: 3
Views: 51

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!
by 905385366
Wed Oct 30, 2019 8:02 pm
Forum: Properties of Electrons
Topic: 1E1
Replies: 2
Views: 50

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.
by 905385366
Wed Oct 30, 2019 7:55 pm
Forum: Lewis Structures
Topic: 4s and 3d
Replies: 4
Views: 100

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
by 905385366
Tue Oct 22, 2019 8:31 pm
Forum: Photoelectric Effect
Topic: Work Function?
Replies: 7
Views: 130

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.
by 905385366
Tue Oct 22, 2019 8:30 pm
Forum: Properties of Electrons
Topic: Electron with wavelike/particle like properties?
Replies: 1
Views: 64

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?
by 905385366
Tue Oct 22, 2019 8:27 pm
Forum: Quantum Numbers and The H-Atom
Topic: f- orbitals?
Replies: 7
Views: 81

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).
by 905385366
Tue Oct 22, 2019 8:25 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 7
Views: 110

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.
by 905385366
Tue Oct 22, 2019 8:21 pm
Forum: Quantum Numbers and The H-Atom
Topic: 1E. 1
Replies: 4
Views: 104

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...
by 905385366
Tue Oct 22, 2019 8:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Homewrok
Replies: 2
Views: 30

Re: Homewrok

It would be regarded as one question.
by 905385366
Mon Oct 21, 2019 12:40 am
Forum: Properties of Electrons
Topic: 1B. 7 Homework help
Replies: 3
Views: 122

Re: 1B. 7 Homework help

thank you so much I figured it out
by 905385366
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: 39

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?
by 905385366
Sat Oct 19, 2019 3:19 pm
Forum: DeBroglie Equation
Topic: 25.
Replies: 4
Views: 96

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?
by 905385366
Sat Oct 19, 2019 2:47 pm
Forum: DeBroglie Equation
Topic: 1B. 19 Homework Help
Replies: 1
Views: 40

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
by 905385366
Sat Oct 19, 2019 12:47 pm
Forum: Properties of Electrons
Topic: 1B. 7 Homework help
Replies: 3
Views: 122

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?
by 905385366
Tue Oct 08, 2019 10:14 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Equations (Question L.35)
Replies: 3
Views: 81

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?
by 905385366
Tue Oct 08, 2019 9:57 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Equations (Question L.35)
Replies: 3
Views: 81

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!
by 905385366
Tue Oct 08, 2019 8:36 pm
Forum: Balancing Chemical Reactions
Topic: Combustion
Replies: 17
Views: 619

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.
by 905385366
Tue Oct 08, 2019 8:34 pm
Forum: Significant Figures
Topic: Sig Fig Decimal
Replies: 10
Views: 140

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.
by 905385366
Tue Oct 08, 2019 6:08 pm
Forum: Significant Figures
Topic: Answer being a tad bit off
Replies: 8
Views: 353

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.
by 905385366
Tue Oct 08, 2019 6:06 pm
Forum: Significant Figures
Topic: Clarification with sig figs
Replies: 6
Views: 96

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.
by 905385366
Tue Oct 08, 2019 6:03 pm
Forum: Significant Figures
Topic: Do we use molar mass ?
Replies: 8
Views: 93

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.
by 905385366
Mon Sep 30, 2019 10:27 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: c or m as concentration
Replies: 4
Views: 381

Re: c or m as concentration

Capital M is usually used to reference molarity while c is another variable used in other equations.
by 905385366
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: 398

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.
by 905385366
Mon Sep 30, 2019 10:23 pm
Forum: Balancing Chemical Reactions
Topic: Combustion Equation
Replies: 21
Views: 1283

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.
by 905385366
Mon Sep 30, 2019 10:18 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula
Replies: 7
Views: 98

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)
by 905385366
Mon Sep 30, 2019 10:14 pm
Forum: SI Units, Unit Conversions
Topic: Calculator Question
Replies: 13
Views: 291

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?

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