Search found 37 matches

by hannabarlow1A
Wed Jul 31, 2019 7:39 am
Forum: Naming
Topic: Naming/Coord Comp
Replies: 2
Views: 93

Re: Naming/Coord Comp

The cation ion is listed first. The ligands are listed in alphabetical order (not including their numerical prefixes) and then the metal ion and its charge and then the anion.
by hannabarlow1A
Wed Jul 31, 2019 7:37 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Diff Sigma btw Pi Bonds
Replies: 1
Views: 77

Re: Diff Sigma btw Pi Bonds

If it is a single bond, it is a sigma bond, any additional bonds (the second bond within a double bond or the second and third bonds in a triple bond) are pi bonds. Sigma bonds occur end to end while pi bonds are side to side; sigma bonds allow atomic rotation and are therefore stronger than pi bond...
by hannabarlow1A
Wed Jul 31, 2019 7:35 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Radical Atoms ?
Replies: 1
Views: 66

Re: Radical Atoms ?

A radical is a compound that has an unpaired electron. If the total number of valence electrons within a compound is an odd number, it will be a radical.
by hannabarlow1A
Wed Jul 31, 2019 7:34 am
Forum: Sigma & Pi Bonds
Topic: Resonance
Replies: 1
Views: 168

Re: Resonance

I know a molecule has resonance when the central atom is bonded to 2 or more of the same element, but has different bonds (single, double, or triple) with the atoms. Since these atoms are the same element, which atom has which bond does not matter and the molecule can have resonance, alternating bet...
by hannabarlow1A
Tue Jul 30, 2019 9:32 am
Forum: Polyprotic Acids & Bases
Topic: Spectator ions
Replies: 1
Views: 191

Spectator ions

How do we know whether or not something is a spectator ion?
by hannabarlow1A
Mon Jul 29, 2019 9:01 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: PH Equations [ENDORSED]
Replies: 1
Views: 91

Re: PH Equations [ENDORSED]

For calculating the equilibrium constant, the concentration of the products go on top and the concentration of the reactants go on the bottom.
by hannabarlow1A
Mon Jul 29, 2019 8:59 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation states
Replies: 5
Views: 134

Re: Oxidation states

For coordination compounds, based on the charge of the overall compound, you can figure out the oxidation state of the central ion based on the known charges of the ligands and ions. For example, [Pt (NH3)5 Cl] Br3 has no net charge, so you know that the sum of all the charges must be 0. NH3 has no ...
by hannabarlow1A
Thu Jul 25, 2019 8:18 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: homework 9C7 7th edition
Replies: 2
Views: 107

Re: homework 9C7 7th edition

My reasoning for this problem was that the angle between the two NH2 molecules in part C is too large for both molecules to bond simultaneously.
by hannabarlow1A
Wed Jul 24, 2019 8:57 am
Forum: Bronsted Acids & Bases
Topic: Fundamentals J #1
Replies: 1
Views: 146

Fundamentals J #1

For number #1 in section J, they ask to identify each compound as a Bronsted acid or base. NH3, HBr, KOH, H2SO3, and Ca(OH)2 I know that Bronsted acids are proton donors and bases are acceptors, but how do we identify that based on just their molecular formula? I feel like I am missing something obv...
by hannabarlow1A
Wed Jul 24, 2019 8:35 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelating [ENDORSED]
Replies: 1
Views: 107

Chelating [ENDORSED]

How can we tell if a molecule can function as a chelating ligand?
by hannabarlow1A
Wed Jul 24, 2019 8:20 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand bonds
Replies: 1
Views: 142

Ligand bonds

How do we know how many times a ligand can bond to a central metal atom? For example, in the 6th edition textbook, problem 17.33b asks for the maximum number of bonds CO3(2-) can form simultaneously.
by hannabarlow1A
Tue Jul 23, 2019 10:31 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Why is AX3E2 linear?
Replies: 8
Views: 188

Re: Why is AX3E2 linear?

We base the electron pair geometry on the number of regions of electron density surrounding the central atom (5), so it is trigonal bipyramidal. For the molecular geometry, we look at the bonds specifically. The bonds between the 3 surrounding atoms with the central atom create a T-shaped geometry.
by hannabarlow1A
Wed Jul 17, 2019 8:12 am
Forum: Ionic & Covalent Bonds
Topic: Dipoles
Replies: 7
Views: 274

Re: Dipoles

Dipole-Dipole interactions occur when polar molecules are attracted to eachother's opposite charges. Hydrogen bonds are a type of dipole-dipole interaction and also rely on polarity
by hannabarlow1A
Wed Jul 17, 2019 8:07 am
Forum: Ionic & Covalent Bonds
Topic: Order of electron loss in ion formation
Replies: 4
Views: 186

Re: Order of electron loss in ion formation

What about with the 3s/4d orbital exception? Does that apply here?
by hannabarlow1A
Tue Jul 16, 2019 8:34 am
Forum: Bond Lengths & Energies
Topic: boiling and melting points
Replies: 1
Views: 114

boiling and melting points

What is the relationship between boiling points, melting points, and a molecule's size and bonds?
by hannabarlow1A
Tue Jul 16, 2019 8:25 am
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds [ENDORSED]
Replies: 3
Views: 208

Re: Covalent Bonds [ENDORSED]

Unless the bonded atoms are the same element, it is likely that the covalent bond has ionic characteristics/some polarity, since different elements possess different electronegativities and will therefore unequally share electrons.
by hannabarlow1A
Tue Jul 16, 2019 8:19 am
Forum: Administrative Questions and Class Announcements
Topic: Homework
Replies: 1
Views: 142

Homework

For the homework due this Thursday, do the 14 problems have to be from the "Molecular Shape and Structure" outline, or can they be from the "Chemical bonds" outline, since we will only get to shape and structure the day before the homework is due?
by hannabarlow1A
Tue Jul 16, 2019 8:16 am
Forum: Lewis Structures
Topic: Aluminum and Boron [ENDORSED]
Replies: 2
Views: 173

Re: Aluminum and Boron [ENDORSED]

Boron and Aluminum need 5 electrons to complete an octet, however, they are exceptions to the octet rule because they are involved in lewis acid-base reactions. They can have a complete octet if another atom provides both electrons for a coordinate covalent bond. In such cases, the electron pair don...
by hannabarlow1A
Tue Jul 16, 2019 8:09 am
Forum: Formal Charge and Oxidation Numbers
Topic: Difference between charge and formal charge [ENDORSED]
Replies: 4
Views: 261

Re: Difference between charge and formal charge [ENDORSED]

The formal charge is assigned to each individual atom and is the difference between the valence electrons it normally possesses and the electrons it possesses in the molecule (from bonds or lone pairs). Each atom in a molecule will have a formal charge, and the sume of their formal charges will make...
by hannabarlow1A
Tue Jul 16, 2019 7:57 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Midterm Question 5C
Replies: 1
Views: 121

Midterm Question 5C

On the midterm, question 5C asks: Write the ground-state electron configuration for Cu+ and give the first two quantum
numbers for the last electron.
Could someone explain how you get the configuration [Ar]3d^10?
by hannabarlow1A
Thu Jul 11, 2019 7:42 am
Forum: Molarity, Solutions, Dilutions
Topic: hw L1
Replies: 1
Views: 123

Re: hw L1

How you wrote out the chemical equation is a bit confusing, but in general, you can tell how many moles are being produced based on the ratios between the stoichiometric coefficients. For example, if there the stoichiometric coefficient for ClO2 is 6 and the stoichiometric coefficient for Br2 is 1, ...
by hannabarlow1A
Wed Jul 10, 2019 8:30 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 6th edition 19b [ENDORSED]
Replies: 2
Views: 167

6th edition 19b [ENDORSED]

In the 6th edition, problem 19 part b asks for the electron configuration and number of unpaired electrons for Sn (4+). Can someone explain why the answer [Kr]4d^85s^2? Thank you
by hannabarlow1A
Wed Jul 10, 2019 8:11 pm
Forum: Lewis Structures
Topic: Double Bonds [ENDORSED]
Replies: 4
Views: 234

Re: Double Bonds [ENDORSED]

For many molecules, there is more than one way to draw its lewis structure/ many places where you can draw a double bond. For example, for NO3-, there can be a double bond between any one of the oxygen atoms and the nitrogen atom. In actuality, this means that the true structure is more of a blend o...
by hannabarlow1A
Wed Jul 10, 2019 8:08 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 6th edition chapter 3 problem 9
Replies: 2
Views: 125

Re: 6th edition chapter 3 problem 9

I had trouble with this question too, until I realized the subshells we were dealing with. With the 4s vs. 3d subshells, electron configurations do not follow the typical "protocol." It takes less energy for electrons to join the 4s orbital and also to leave it, so the +2 charge means that...
by hannabarlow1A
Sun Jul 07, 2019 1:01 pm
Forum: Properties of Light
Topic: Class lecture
Replies: 2
Views: 153

Re: Class lecture

Hydrogen atoms are simpler models for quantum analysis because they only have one electron, allowing us to only analyze that singular electron and its behavior/energy levels
by hannabarlow1A
Sun Jul 07, 2019 12:58 pm
Forum: Photoelectric Effect
Topic: Photo electric effect
Replies: 7
Views: 229

Re: Photo electric effect

If the experiment were not conducted within a vacuum, there would be other variables, such as other molecules, we would have to consider that could impact the results.
by hannabarlow1A
Sun Jul 07, 2019 11:12 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodes
Replies: 1
Views: 120

Nodes

Do we need to know about angular vs. radial nodes and the formulas used to calculate how many of them an orbital has? If so, what distinguishes the two apart from eachother?
by hannabarlow1A
Sun Jul 07, 2019 11:10 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: quantum numbers
Replies: 1
Views: 113

quantum numbers

What does it mean that m(l) is related to the orientation of an orbital? Could someone explain what m(l) really tells us?
by hannabarlow1A
Sun Jul 07, 2019 11:09 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Atomic Orbitals [ENDORSED]
Replies: 5
Views: 196

Atomic Orbitals [ENDORSED]

Will we need to know about "spherical polar coordinates," which are mentioned in section 2.2 of the textbook?
by hannabarlow1A
Wed Jul 03, 2019 9:14 am
Forum: Photoelectric Effect
Topic: kinetic energy of electron
Replies: 8
Views: 261

Re: kinetic energy of electron

When the energy of the photon is equal to the threshold energy (energy needed to release an electron), then kinetic energy of the electron will equal 0. If the photon's energy was less than the threshold energy, an electron would not be released, and if the photon's energy was greater than the thres...
by hannabarlow1A
Wed Jun 26, 2019 8:50 pm
Forum: Properties of Light
Topic: Light variables
Replies: 3
Views: 178

Light variables

Could someone please explain the different variables we measure when dealing with light and their relationships to one another? I remember frequency and wavelength, but think I am forgetting one or two? Thank you!
by hannabarlow1A
Wed Jun 26, 2019 8:46 pm
Forum: Limiting Reactant Calculations
Topic: How do you approach question M1 in 6th edition book?
Replies: 2
Views: 156

Re: How do you approach question M1 in 6th edition book?

Since we are told hypochlorite is in excess, we know that ammonia is our limiting reactant. To find theoretical yield, first divide the 35 g of ammonia by ammonia's molar mass to convert the value to moles of ammonia. Luckily, the chemical equation is already balanced so we can see the stoichiometri...
by hannabarlow1A
Wed Jun 26, 2019 8:36 pm
Forum: Balancing Chemical Reactions
Topic: Combustion Equation
Replies: 18
Views: 699

Re: Combustion Equation

Lauren Huang 1H wrote:Sometimes nitrogen can be an added reactant and product of the equation.

Will this be something that comes up in 14A though? Or should we just assume oxygen and water for now?
by hannabarlow1A
Wed Jun 26, 2019 8:34 pm
Forum: Empirical & Molecular Formulas
Topic: Butter Chicken
Replies: 4
Views: 253

Re: Butter Chicken

Should we expect these worksheets to generally be easier or harder than test material?
by hannabarlow1A
Wed Jun 26, 2019 8:32 pm
Forum: Molarity, Solutions, Dilutions
Topic: the mole
Replies: 4
Views: 187

Re: the mole

Density is equal to mass divided by volume. Using SI units, it is kilograms per cubic meter.
by hannabarlow1A
Wed Jun 26, 2019 8:28 pm
Forum: Molarity, Solutions, Dilutions
Topic: Homework Problem G.13 in Fundamentals
Replies: 3
Views: 154

Re: Homework Problem G.13 in Fundamentals

This problem can be solved as long as we know that even if a solution is diluted, the amount of solute stays the same. The variable for the amount of solute is n and n can be calculated by multiplying molarity (M) times volume (v). Thus, knowing that n stays the same, M times v also stays the same. ...
by hannabarlow1A
Wed Jun 26, 2019 8:20 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.5
Replies: 3
Views: 183

Re: G.5

For part A: First, I calculated the molar mass of the compound, which is 105.99 g/mol. Next, to convert this value to moles, I calculated 2.111 g divided by the molar mass (g/mol) so that grams cancel out and we are just left with moles. Now that we have the number of moles (.0199 moles), we can div...

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