Search found 55 matches

by AChoudhry_1L
Fri Dec 06, 2019 9:59 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Homework Help
Replies: 1
Views: 36

Homework Help

Which of the following ligands can be polydentate? If the ligand can be polydentate, give the maximum number of places on the ligand that can bind simultaneously to a single metal center: (a) HN(CH2CH2NH2)2; (b) (CO3)2-; (c) H2O; (d) oxalate

Can someone explain the process of doing this problem?
by AChoudhry_1L
Fri Dec 06, 2019 9:57 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: HW 9C.9
Replies: 2
Views: 36

HW 9C.9

With the help of Table 9C.1, determine the coordination number of the metal ion in each of the following complexes: (a) [NiCl4]2–; (b) [Ag(NH3)2]+; (c) [PtCl2(en)2]2+; (d) [Cr(edta)]-

How would we determine the coordination numbers for c and d?
by AChoudhry_1L
Fri Dec 06, 2019 7:03 pm
Forum: Hybridization
Topic: Hybridization for Triple Bonds
Replies: 1
Views: 28

Hybridization for Triple Bonds

If you have a molecule such as C2H2, there would be a triple bond between the carbons. How do you write out the hybridization with the triple bond?
by AChoudhry_1L
Mon Dec 02, 2019 7:46 pm
Forum: Lewis Acids & Bases
Topic: Long bonds vs Short bonds?
Replies: 9
Views: 103

Re: Long bonds vs Short bonds?

Bond strength relates to how easy it is to pull electrons away from an atom. In regards to acids, strong acids are when bonds are further apart, making it easier for the electrons to be donated.
by AChoudhry_1L
Mon Dec 02, 2019 7:43 pm
Forum: Conjugate Acids & Bases
Topic: Question on Problem 6.21
Replies: 1
Views: 71

Question on Problem 6.21

The two strands of the nucleic acid DNA are held together by hydrogen bonding between four organic bases. The structure of one of these bases, thymine, is shown below. (a) How many pro- tons can this base accept? (b) Draw the structure of each conjugate acid that can be formed. (c) Mark with an aste...
by AChoudhry_1L
Mon Dec 02, 2019 7:38 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: HW 6D11
Replies: 2
Views: 93

HW 6D11

Decide whether an aqueous solution of each of the following salts has a pH equal to, greater than, or less than 7. If pH>7 or pH< 7, write a chemical equation to justify your answer. (a) NH4Br; (b) Na2CO3; (c) KF; (d) KBr; (e) AlCl3; (f) Cu(NO3)2 How would you determine the charge on the reactants i...
by AChoudhry_1L
Mon Dec 02, 2019 7:36 pm
Forum: Identifying Acidic & Basic Salts
Topic: Homework 6.5
Replies: 1
Views: 58

Homework 6.5

Hydrogen peroxide, H2O2, reacts with sulfur trioxide to form peroxomonosulfuric acid, H2SO5, in a Lewis acid–base reaction. (a) Write the chemical equation for the reaction. (b) Draw the Lewis structures of the reactants and product (in the product, one OOH group in sulfuric acid is replaced by an O...
by AChoudhry_1L
Mon Dec 02, 2019 7:34 pm
Forum: Conjugate Acids & Bases
Topic: HW 6.13
Replies: 1
Views: 29

HW 6.13

Draw the Lewis structure of boric acid, B(OH)3. (a) Is resonance important for its description? (b) The proton transfer equilibrium for boric acid is given in a footnote to Table 6C.1. In that reaction does boric acid act as a Lewis acid, a Lewis base, or neither? Justify your answer by using Lewis ...
by AChoudhry_1L
Wed Nov 27, 2019 9:45 pm
Forum: Bronsted Acids & Bases
Topic: Memorizing the Bronsted Acids and Bases
Replies: 4
Views: 54

Re: Memorizing the Bronsted Acids and Bases

It is useful to know the common ones. However, in lecture Dr. Lavelle mentioned that if a problem provides you with an equilibrium constant, it is likely to be a weak acid/base. This may be helpful in making that distinction.
by AChoudhry_1L
Wed Nov 27, 2019 9:42 pm
Forum: Bronsted Acids & Bases
Topic: Acids vs Bases
Replies: 5
Views: 46

Re: Acids vs Bases

There are many distinctions between acids and bases. Some important ones to keep in mind are that acids generally have a pH lower than 7 and bases generally have a pH higher than 7. Acids are usually proton donors and bases are usually proton acceptors.
by AChoudhry_1L
Wed Nov 27, 2019 9:39 pm
Forum: Bronsted Acids & Bases
Topic: J9
Replies: 3
Views: 82

J9

Identify the salt that is produced from the acid–base neutral- ization reaction between (a) potassium hydroxide and acetic acid, CH3COOH; (b) ammonia and phosphoric acid; (c) calcium hydroxide and bromous acid; (d) sodium hydroxide and hydrosul- furic acid, H2S (both H atoms react). Write the comple...
by AChoudhry_1L
Wed Nov 27, 2019 9:38 pm
Forum: Bronsted Acids & Bases
Topic: Writing Chemical Equations
Replies: 2
Views: 30

Writing Chemical Equations

When writing out chemical equations with acids and bases, how do you know what pairs with what?
by AChoudhry_1L
Wed Nov 27, 2019 9:36 pm
Forum: Bronsted Acids & Bases
Topic: J17 Help
Replies: 2
Views: 54

J17 Help

In each of the following salts, either the cation or the anion is a weak acid or a weak base in water. Write the chemical equation for the proton transfer reaction of this cation or anion with water: (a) NaC6H5O (b) KClO (c) C5H5NHCl (d) NH4Br What are the general guidelines for solving this problem...
by AChoudhry_1L
Thu Nov 21, 2019 8:01 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: 3F 15
Replies: 5
Views: 84

3F 15

Why is it that AsF3 has a higher boiling point than AsF5, despite AsF5 being a bigger molecule? I understand that AsF3 is polar and has dipole-dipole IMF, but do we ignore the molecular weight comparison?
by AChoudhry_1L
Thu Nov 21, 2019 7:53 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 Point Comparison
Replies: 1
Views: 37

Boiling Point Comparison

Which would have a higher boiling point between C2H5OC2H5 (diethyl ether) and C4H9OH (butanol) and why is this? This is from homework problem 3F 5.
by AChoudhry_1L
Thu Nov 21, 2019 6:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle of bent
Replies: 17
Views: 117

Re: Bond Angle of bent

If there are 2 lone pairs, then it would be less than 109.5 degrees. If there is 1 lone pair, then it would be less than 120 degrees. Both are bent shape, but the bond angles differ depending on the amount of lone pairs.
by AChoudhry_1L
Thu Nov 21, 2019 6:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: N2H4
Replies: 1
Views: 29

N2H4

Could someone describe the shape and bond angles of N2H4?
by AChoudhry_1L
Thu Nov 21, 2019 6:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Specific Naming Question
Replies: 4
Views: 43

Specific Naming Question

For 2F 11A, the molecule we are given is SCl4. This is both trigonal bipyramidal and described as seesaw. Which should we be memorizing? Which one will we be asked for on the test?
by AChoudhry_1L
Wed Nov 13, 2019 9:15 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: London Forces and Dipole-Dipole
Replies: 5
Views: 74

Re: London Forces and Dipole-Dipole

ALegala_3I wrote:London Dispersion forces act on all molecules and atoms. This includes nonpolar molecules, monoatomic gases, and in molecules that also exhibit dipole-dipole interactions.

Is it true then that London Forces also act on polar molecules as well?
by AChoudhry_1L
Wed Nov 13, 2019 9:14 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Determining Polarity
Replies: 5
Views: 68

Determining Polarity

How do you determine if a molecule is polar? I know that you would look at the electronegativity, but is there a cut off between what counts as being electronegative enough to be considered polar?
by AChoudhry_1L
Wed Nov 13, 2019 9:10 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Molecule Size and Melting Points
Replies: 6
Views: 50

Molecule Size and Melting Points

Is it true that bigger molecules have higher melting points? Is this the thought process behind figuring out which would have a higher melting point between CHI3 and CHF3?
by AChoudhry_1L
Wed Nov 13, 2019 9:05 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: 3F.5 [ENDORSED]
Replies: 4
Views: 113

Re: 3F.5 [ENDORSED]

Looking at the lewis structures may help, and examining the general types of the compound might further clarify which substance has a higher melting point. For example, in (a), between HCl and NaCl, NaCl will have a higher melting point because it's an ionic compound. In (b), Butanol is stronger be...
by AChoudhry_1L
Wed Nov 13, 2019 9:02 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: London Forces and Dipole-Dipole
Replies: 5
Views: 74

London Forces and Dipole-Dipole

Why is it that London forces always occur when there are dipole-dipole interactions? Will London forces ALWAYS occur when they are dipole-dipole interactions?
by AChoudhry_1L
Wed Nov 06, 2019 12:22 pm
Forum: Trends in The Periodic Table
Topic: Effect of Charge on an Atom
Replies: 2
Views: 35

Effect of Charge on an Atom

What does charge have to do with polarizing power/how polarizable an atom is?
by AChoudhry_1L
Wed Nov 06, 2019 12:19 pm
Forum: Einstein Equation
Topic: Unit Question
Replies: 3
Views: 85

Unit Question

What does the unit MHz mean and how do we convert this to HZ?
by AChoudhry_1L
Wed Nov 06, 2019 10:45 am
Forum: Photoelectric Effect
Topic: Intensity in Photoelectric Effect
Replies: 6
Views: 137

Intensity in Photoelectric Effect

How does intensity play a role in the photoelectric effect?
by AChoudhry_1L
Tue Nov 05, 2019 10:20 pm
Forum: Quantum Numbers and The H-Atom
Topic: Clarification about Unique Quantum Numbers
Replies: 1
Views: 43

Clarification about Unique Quantum Numbers

If we are given values for n, l, and ml, is it true that only one orbital can have these specific quantum numbers?
by AChoudhry_1L
Tue Nov 05, 2019 10:18 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers Question
Replies: 2
Views: 43

Quantum Numbers Question

If n=2, how many possible orbitals are there?
by AChoudhry_1L
Thu Oct 31, 2019 6:52 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: What is the x, y, z?
Replies: 4
Views: 51

Re: What is the x, y, z?

Because the p subshell has 3 different orbitals, the x, y, and z help differentiate between those three.
by AChoudhry_1L
Thu Oct 31, 2019 6:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Hw problem 2A.13
Replies: 4
Views: 51

Re: Hw problem 2A.13

The way that I would approach this problem is by first writing out the ground state electron configurations. The electron would be removed from the last orbital and this is easier to see when you have the configuration written out.
by AChoudhry_1L
Thu Oct 31, 2019 6:40 pm
Forum: DeBroglie Equation
Topic: Question about Converting Units
Replies: 3
Views: 57

Question about Converting Units

How do we convert keV to joules? This was needed for homework problem 5 from section 1B.
by AChoudhry_1L
Thu Oct 31, 2019 6:38 pm
Forum: Properties of Electrons
Topic: Atomic Spectra
Replies: 2
Views: 43

Atomic Spectra

In homework problem 15 from section 1B, part d asks what what kind of electromagnetic radiation was used from a wavelength of 8.8 nm. The answer was x-ray/gamma rays, however, is this something we will have to know for exams?
by AChoudhry_1L
Thu Oct 31, 2019 6:25 pm
Forum: DeBroglie Equation
Topic: Unit Conversion
Replies: 2
Views: 56

Unit Conversion

In homework problem 9 from section 1B, we are given 2 seconds which eventually needs to be converted to joules. The solution manual says that 2 seconds is equal to 64 J. How do we convert seconds to joules?
by AChoudhry_1L
Tue Oct 22, 2019 10:09 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations for electrons in the D subshell
Replies: 5
Views: 66

Re: Electron Configurations for electrons in the D subshell

In this case, you would fill the d subshell. You should try to completely fill or half fill the d subshell because doing this allows the atom to be as stable as possible. Because of this, 4d105s1 would be the correct electron configuration.
by AChoudhry_1L
Tue Oct 22, 2019 10:04 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: quantum numbers
Replies: 3
Views: 40

Re: quantum numbers

For the ml values, you have to account for the negatives as well. For n=3, the ml values would be -2,-1,0,1,2.
by AChoudhry_1L
Tue Oct 22, 2019 10:01 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration Specifics
Replies: 3
Views: 40

Re: Electron Configuration Specifics

He did this in order to demonstrate Hund's Rule, that electrons fill each orbital before they are paired in one orbital. He was representing each electron in its own orbital instead of just giving the total number of electrons in the subshell. He said that it's BETTER and more specific to do it in ...
by AChoudhry_1L
Tue Oct 22, 2019 9:57 am
Forum: Trends in The Periodic Table
Topic: Periodic Trend Exceptions
Replies: 7
Views: 68

Periodic Trend Exceptions

In lecture, we went over the trends shown in the periodic table, however, Dr. Lavelle mentioned that there were a few exceptions to these trends. Which ones do we have to know and why do they not follow the trends?
by AChoudhry_1L
Tue Oct 22, 2019 9:53 am
Forum: Quantum Numbers and The H-Atom
Topic: f- orbitals?
Replies: 4
Views: 45

Re: f- orbitals?

Being familiar with the f- orbitals can be helpful in having a more holistic understanding of electron configurations and orbitals, but Dr. Lavelle mentioned that we do not have to worry about them for exams. Just be familiar with the s, p, and d blocks.
by AChoudhry_1L
Tue Oct 22, 2019 9:50 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework Problem Help
Replies: 5
Views: 75

Re: Homework Problem Help

An orbital must have 3 quantum numbers, and no two orbitals can have the same quantum numbers. Knowing this, b and d both indicate only 1 orbital because they list 3 quantum numbers. For a and c, since all 3 quantum numbers are not given we must list the other possible numbers to find the number of...
by AChoudhry_1L
Tue Oct 22, 2019 9:46 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework Problem Help
Replies: 5
Views: 75

Re: Homework Problem Help

RichBollini3C wrote:Does anyone know what section problems we should be turning in for homework #4? Is it still quantum?


Yes, homework #4 can be on quantum since we were still doing the quantum unit this week.
by AChoudhry_1L
Wed Oct 16, 2019 6:48 pm
Forum: Molarity, Solutions, Dilutions
Topic: What is Molarity?
Replies: 11
Views: 253

Re: What is Molarity?

Molarity refers to the concentration of a solution. The formula for finding molarity is M=n/V. This means that to find molarity, you divide the moles of solute by the volume of solution. The units for molarity are mol/L so make sure you watch your units.
by AChoudhry_1L
Wed Oct 16, 2019 6:44 pm
Forum: Properties of Electrons
Topic: Question About Electron State
Replies: 3
Views: 41

Question About Electron State

At the end if today's lecture, Dr. Lavelle described the electron as being in the 2px state. What does he mean by this?
by AChoudhry_1L
Wed Oct 16, 2019 6:33 pm
Forum: Empirical & Molecular Formulas
Topic: Molecular to Empirical Formula
Replies: 10
Views: 241

Re: Molecular to Empirical Formula

You would only be able to do this if the problem provides the molar mass of the molecular formula. This mass is usually provided in problems if they want you to find the molecular formula. You would then divide the given molar mass by the mass of the empirical formula mass. The answer you get is wha...
by AChoudhry_1L
Wed Oct 16, 2019 6:23 pm
Forum: Quantum Numbers and The H-Atom
Topic: Homework 1B25 Help
Replies: 1
Views: 52

Homework 1B25 Help

Can someone explain how to find the answer to this problem?

1B.25) What is the minimum uncertainty in the speed of an electron confined within a lead atom of diameter 350. pm? Model the atom as a one-dimensional box with a length equal to the diameter of the actual atom.
by AChoudhry_1L
Wed Oct 16, 2019 6:20 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Homework Problem Help
Replies: 5
Views: 75

Homework Problem Help

Could someone explain this problem me?

1D23) How many orbitals can have the following quantum numbers in an a tom:(a)n=2, l=1;(b)n=4, l=2, ml=-2; (c)n=2;(d)n=3, l=2, ml=+1?
by AChoudhry_1L
Sat Oct 12, 2019 6:35 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilutions
Replies: 10
Views: 359

Re: Dilutions

I would also use the M1*V1=M2*V2 formula in this situation. Plug in the known values and solve for the unknown. The only thing I would say is to be careful of units. Sometimes the units provided and the units asked for are different and you must convert them.
by AChoudhry_1L
Sat Oct 12, 2019 6:32 pm
Forum: Significant Figures
Topic: Sig Figs in Answer
Replies: 8
Views: 139

Re: Sig Figs in Answer

In terms of percentage calculations, I would leave 4 sig figs such as 56.41%, however in answers with decimals I would leave at least have three digits after the decimal, such as 0.379 or 15.255. Remember to keep as many digits as possible when calculating and only round when you get your final answ...
by AChoudhry_1L
Sat Oct 12, 2019 6:28 pm
Forum: Empirical & Molecular Formulas
Topic: empirical to molecular formula [ENDORSED]
Replies: 9
Views: 240

Re: empirical to molecular formula [ENDORSED]

When finding the ratio, divide the total molar mass by the empirical mass. Sometimes, this will give you 1 and that means that the molar mass is the same as the empirical mass and therefore, the formulas are the same as well.
by AChoudhry_1L
Sat Oct 12, 2019 6:24 pm
Forum: Properties of Electrons
Topic: Electron Energy Levels
Replies: 8
Views: 66

Re: Electron Energy Levels

The amount of energy levels depends on what element we are talking about. Each element's atoms have different amounts of energy levels. For example, Hydrogen has electrons in the first energy level and Oxygen has electrons in the second energy level.
by AChoudhry_1L
Sat Oct 12, 2019 6:19 pm
Forum: DeBroglie Equation
Topic: Knowing Which Equation to Use
Replies: 4
Views: 63

Knowing Which Equation to Use

When approaching quantum problems, what is your method to determine which equation we should be using?
by AChoudhry_1L
Tue Oct 01, 2019 10:02 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Tips on how to write a formula out from the name
Replies: 9
Views: 187

Re: Tips on how to write a formula out from the name

One thing that helps me to write down the formulas from the word is to analyze the prefixes of the words. For example, dioxide means 2 atoms of oxygen because di means 2 and hexafluoride has 6 atoms of fluorine because the prefix hexa means 6. This helps with figuring out what subscript each element...
by AChoudhry_1L
Tue Oct 01, 2019 9:51 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Balancing Equations [ENDORSED]
Replies: 25
Views: 747

Re: Balancing Equations [ENDORSED]

An easy way for me to determine what number to multiple a decimal by to get a whole number is to divide 1 by the decimal. For example: If there are 2.5 mols of C, do 1/0.5 = 2. You should multiply the 2.5 mols by 2 to get a whole number (5). If it's a more difficult value, maybe like 2.125 mols of ...
by AChoudhry_1L
Tue Oct 01, 2019 9:47 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units
Replies: 6
Views: 113

Re: Formula Units

I was wondering the same thing, but as I was doing practice problems I noticed that you need to use Avogadro's number when you want your answer to be in atoms. This is useful when your units are moles, but you want it to be a certain amount of atoms or molecules.
by AChoudhry_1L
Tue Oct 01, 2019 9:44 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Units in Answer
Replies: 18
Views: 259

Units in Answer

If a question asks how much of something you will need, should your answer be in grams or moles?
by AChoudhry_1L
Tue Oct 01, 2019 9:38 pm
Forum: Significant Figures
Topic: Sig Fig Rules
Replies: 2
Views: 60

Re: Sig Fig Rules

The rules for multiplication/division and addition/subtraction are similar. For addition/subtraction, the number of decimal places in your answer must be the same as the smallest number of decimal places in your equation. For example, 0.032 + 0.40 = 0.43. For multiplication/division, your answer sho...

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