## Search found 26 matches

Thu Dec 07, 2017 6:24 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Homework problem 12.51 Relative Acidity
Replies: 1
Views: 313

### Homework problem 12.51 Relative Acidity

In homework problem 12.51, the book explains that HClO2 is a stronger acid than HClO because the oxidation state of Cl is higher in HClO2. How do we determine the oxidation states of Cl in these two molecules?
Tue Dec 05, 2017 7:10 pm
Forum: Calculating the pH of Salt Solutions
Topic: negative pH
Replies: 2
Views: 398

### negative pH

Can the pH of a solution be negative? If so, what would cause this?
Tue Dec 05, 2017 11:20 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: homework problem 11.89
Replies: 2
Views: 337

### Re: homework problem 11.89

Thank you! That was very helpful.
Mon Dec 04, 2017 9:39 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: homework problem 11.89
Replies: 2
Views: 337

### homework problem 11.89

In problem 11.89 of the homework, how do we find the balanced chemical equation for part a?
Wed Nov 29, 2017 11:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Square Planar
Replies: 3
Views: 284

### Square Planar

What are the bond angles for molecule with a square planar molecular shape?
Mon Nov 27, 2017 9:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Homework 11.1d
Replies: 1
Views: 155

### Homework 11.1d

Can someone explain why "If one starts with higher concentrations of reactants, the equilibrium concentrations of the products will be larger" is true from homework problem 11.1d? I thought change in concentrations didn't affect this.
Tue Nov 21, 2017 6:42 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelate
Replies: 1
Views: 175

### Chelate

Does the formation of a chelate require that the ligand is polydentate?
Tue Nov 21, 2017 6:40 pm
Forum: Naming
Topic: Naming
Replies: 2
Views: 233

### Naming

Can someone explain when we use "ion" at the end of the name of a coordination compound?
Thu Nov 16, 2017 10:36 pm
Forum: Hybridization
Topic: Orientation of Hybrid Orbitals: 4.31
Replies: 2
Views: 325

### Re: Orientation of Hybrid Orbitals: 4.31

Thank you!
Thu Nov 16, 2017 10:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.19 b
Replies: 3
Views: 248

### Re: 4.19 b

The lewis structure is formatted H3-C-Be-C-H3 and each C atom has a tetrahedral molecular shape (AX3) with bond angles of 109.5 and Be has a linear molecular shape (AX2) with a bond angle of 180.
Thu Nov 16, 2017 10:29 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: TM Cations
Replies: 2
Views: 247

### TM Cations

How many bonds do transition metal cations normally form or does it vary across elements? In the examples in class they all formed 6 bonds and created an octahedral molecular shape. Is this always the case in the formation of a coordination complex?
Thu Nov 16, 2017 10:25 pm
Forum: Hybridization
Topic: Orientation of Hybrid Orbitals: 4.31
Replies: 2
Views: 325

### Orientation of Hybrid Orbitals: 4.31

How do we know the relative orientations of hybrid orbitals: sp, sp2, sp3, sp3d, sp3d2 (such as it is asked in problem 4.31)?
Wed Nov 08, 2017 5:28 pm
Forum: Bond Lengths & Energies
Topic: Factors that control bond length
Replies: 3
Views: 1947

### Factors that control bond length

Can someone explain how electronegativity, bond order, size and any other important factors affect bond length/strength?
Wed Nov 08, 2017 5:17 pm
Forum: Bond Lengths & Energies
Topic: Homework Problem 3.87
Replies: 5
Views: 533

### Homework Problem 3.87

Can someone please explain why CF4 has the shortest bond out of CF4, CCl4, and CBr4? I understand that it is the strongest because it is the shortest, however, I'm not sure how to determine that it has the shortest bond.
Thu Nov 02, 2017 10:12 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: shielding effect of s and p-orbitals
Replies: 4
Views: 459

### Re: shielding effect of s and p-orbitals

S-electrons can "penetrate" the nucleus (be found at the nucleus) because it has a nonzero probability at the nucleus. Therefore the s-oribtal has a spherical shape encompassing the nucleus, while the higher orbitals (p,d,f) have nodal planes (zero probability of being found) at the nucleus.
Thu Nov 02, 2017 10:08 pm
Forum: Trends in The Periodic Table
Topic: Exceptions to trends [ENDORSED]
Replies: 6
Views: 2244

### Re: Exceptions to trends[ENDORSED]

This exception between group 15 and 16 only applies to ionization energy. It does not apply to atomic radius because atomic radius doesn't involve the amount of energy when removing electrons, just the size changes when they are added. It does not apply to electron affinity because electron affinity...
Thu Oct 26, 2017 6:09 pm
Forum: Trends in The Periodic Table
Topic: Exceptions to Ionization Energy Trend
Replies: 1
Views: 214

### Exceptions to Ionization Energy Trend

What exceptions to the ionization trend are we expected to know?
Thu Oct 26, 2017 6:05 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity vs Electronegativity
Replies: 2
Views: 1289

### Re: Electron Affinity vs Electronegativity

Ionization Energy is the minimum energy required to remove an electron from a neutral atom in the gas phase. The ionization energy of an atom decreases as you go down a group because the outermost electrons (the ones that will be removed first) occupy shells farther away from the nucleus and thus ha...
Thu Oct 19, 2017 9:44 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer/Lyman Series [ENDORSED]
Replies: 7
Views: 584

### Re: Balmer/Lyman Series[ENDORSED]

Just to elaborate on the Lyman and Balmer series: The Lyman series includes transitions when n1=1 and n2=n1+1, n1+2,... and it emits electromagnetic radiation with a frequency that correlates to the ultraviolet spectrum. The Balmer series includes transitions when n1=2 and n2=n1+1, n1+2,... and it e...
Thu Oct 19, 2017 9:34 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg Equation
Replies: 7
Views: 563

### Rydberg Equation

In the Rydberg Equation (v=R(1/n1^2-1/n2^2)) is N1 always the lower energy level or is it the initial energy level (the energy level the electron started on before absorbing or emitting an electron)?
Thu Oct 12, 2017 8:21 pm
Forum: *Shrodinger Equation
Topic: Help on Self-Test 1.8A
Replies: 4
Views: 424

### Re: Help on Self-Test 1.8A

I think I just forgot to square L! Thank you so much!
Thu Oct 12, 2017 7:53 pm
Forum: *Shrodinger Equation
Topic: Help on Self-Test 1.8A
Replies: 4
Views: 424

### Re: Help on Self-Test 1.8A

So I solved for wavelength to equal (8*Me*C*L^2)/3h but I am still getting the answer wrong. What values did you use?
Thu Oct 12, 2017 5:28 pm
Forum: *Shrodinger Equation
Topic: Help on Self-Test 1.8A
Replies: 4
Views: 424

### Help on Self-Test 1.8A

I am having trouble with the Self-Test 1.8A problem on page 24 of Chapter 1. It states: "Use the same model for helium (referring to the example above) but suppose that the box is 100.pm long, because the atom is smaller. Estimate the wavelength of the same transition." In the example abov...
Thu Oct 05, 2017 12:12 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Process
Replies: 11
Views: 706

### Re: Balancing Process

In response to the question about finding molar masses in a balanced equation: The stoichiometric coefficients don't affect the molar mass of the compound, so the 4 in your example shouldn't be used in the calculation of the molar mass of NH3. The stoichiometric coefficients tell you how many moles ...
Thu Oct 05, 2017 12:09 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Process
Replies: 11
Views: 706

### Re: Balancing Process

In response to the question about whether we need to know the molecular formula of nitric acid: Dr. Lavelle may give us the formulas on the first test, but it is a good idea to become familiar with the nomenclature of compounds (see fundamentals section D). For example nitric acid is a polyatomic ox...
Wed Oct 04, 2017 10:37 pm
Forum: Empirical & Molecular Formulas
Topic: Percentage Yield M.3
Replies: 2
Views: 422

### Re: Percentage Yield M.3

I just want clarify the stoichiometric calculations needed to get from 42.73 g of CaCO3 to the grams CO2 in case more explanation was needed: 1. Divide by the given grams of CaCO3 (42.73 g CaCO3) by the molar mass of CaCO3 (100.09 g.mol-1 CaCO3) to get moles of CaCO3. 2. Convert moles of CaCO3 to mo...