## Search found 12 matches

Tue Jul 26, 2016 8:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc for Ni(CO)4(g) > Ni(s) + 4CO(g) (Fall 2013) [ENDORSED]
Replies: 1
Views: 1662

### Kc for Ni(CO)4(g) > Ni(s) + 4CO(g) (Fall 2013)[ENDORSED]

I'm having trouble writing out the expression for this reaction, given concentration of 1.0 M of Ni(CO)4 Ni(CO)_{4}_{(g)} \rightleftharpoons Ni_{(s)} + 4CO_{(g)} The solution writes Kc = X^{4} / (1-\frac{x}{4}) I don't understand why x/4 is there in the denomi...
Sun Jul 24, 2016 9:48 pm
Forum: Bronsted Acids & Bases
Topic: Classifying reactions between Bronsted acids and bases (12.9 [ENDORSED]
Replies: 1
Views: 288

### Classifying reactions between Bronsted acids and bases (12.9[ENDORSED]

For the homework problem 12.9 c), why can't we classify the reaction as occurring between a Bronsted acid and base?
Sat Jul 23, 2016 6:53 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate bases and acids homework 12(11) [ENDORSED]
Replies: 1
Views: 262

### Re: Conjugate bases and acids homework 12(11)[ENDORSED]

Part is showing that $HCO_{3}^{-}$ can act as an acid by reacting with water (which acts as a base in this reaction) to form $H_{3}O^{+}$ which is the conjugate acid of water, and $CO_{3} ^ {2-}$ which is the conjugate base of $HCO_{3}^{-}$

Sat Jul 16, 2016 3:23 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 17.37 Determine the Coordination Number [ENDORSED]
Replies: 1
Views: 216

### Re: 17.37 Determine the Coordination Number[ENDORSED]

This questions is asking for the number of bonds each metal makes with the ligands around it. In a), Ni makes 4 bonds because there are 4 Cl atoms, so its coordination number is 4. In b), Ag makes 2 bonds with each NH3 molecule, in c), Pt makes 2 bonds with Cl, and 4 bonds with en (because en is a b...
Sat Jul 16, 2016 12:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Is "Angular" the same thing as "bent"? [ENDORSED]
Replies: 1
Views: 345

### Is "Angular" the same thing as "bent"?[ENDORSED]

In problem 4.5, the solutions manual states that the shape for a molecule with 2 bonds and 1 lone pair is "angular". Is that just another name for "bent"?
Sat Jul 16, 2016 12:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: "Stating hybridization" vs "Hybridized orbitals"
Replies: 1
Views: 300

### Re: "Stating hybridization" vs "Hybridized orbitals"

I believe that hybridization and hybrid orbitals ultimately refer to the same thing, and they include both atoms and lone pairs, i.e. regions of electron density. For instance in 4.33 c), B has hybridization of sp3 because is is bonded to 4 atoms (4 regions of electron density in total), and in 4.35...
Wed Jul 06, 2016 3:04 am
Forum: Ionic & Covalent Bonds
Topic: Why is LiH more ionic than HCL? (Fall 2011, Q6B C)
Replies: 2
Views: 669

### Why is LiH more ionic than HCL? (Fall 2011, Q6B C)

Why is LiH more ionic than HCL? is it because Li is a metal and H is a non-metal, while H and Cl are both non-metals, and in general the bond between a non-metal and a metal is ionic? When do we evaluate ionic character based on differences in electronegativity versus whether the bond is between met...
Sun Jul 03, 2016 7:47 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent vs ionic character
Replies: 2
Views: 428

### Covalent vs ionic character

The course reader states that if the difference in electronegativity between atoms is < 1.5 then the bond between those two atoms is covalent, whereas if the difference is > 2 then the bond is ionic. My question is how do we determine what kind of bond there is between two atoms if the difference be...
Tue Jun 28, 2016 9:37 pm
Forum: Molarity, Solutions, Dilutions
Topic: Estimating amount of moles of a reactant (Fundamentals L.1) [ENDORSED]
Replies: 1
Views: 248

### Estimating amount of moles of a reactant (Fundamentals L.1)[ENDORSED]

I'm having some trouble with this problem:

"Without using a calculator, estimate what amount of Br2 (in moles) can be obtained from 0.30 mol ClO2 in the reaction
6ClO2 + 2BrF3 -> 6ClO2F + Br2

Thank you in advance!
Sat Jun 25, 2016 10:29 am
Forum: SI Units, Unit Conversions
Topic: Conversions [ENDORSED]
Replies: 8
Views: 1066

### Re: Conversions[ENDORSED]

Yes. If you do the following dimensional analysis:

1 kJ * 1000 J/1kJ

the kJ will cancel out the other kJ and you will end up with J
Fri Jun 24, 2016 11:48 pm
Forum: Properties of Light
Topic: Energy required to break a C-C bond (Problem 1.65) [ENDORSED]
Replies: 1
Views: 346

### Energy required to break a C-C bond (Problem 1.65)[ENDORSED]

In the solutions manual, the energy (348 kJ/mol) was multiplied by 1 mol C-C bonds/6.022*12^23 C-C bonds.
I'm having trouble understanding that step. Why couldn't we just directly use the given energy (after converting from kJ/mol to J/mol) in the calculations?
Fri Jun 24, 2016 10:44 pm
Forum: Properties of Light
Topic: Exercise 1.3 ( explanation needed) [ENDORSED]
Replies: 1
Views: 256

### Re: Exercise 1.3 ( explanation needed)[ENDORSED]

Part b) is showing an inverse relationship between frequency and wavelength. So it is false to say wavelength of the raditation decreases as frequency decreases. Because of the inverse relationship, the wavelength of the radiation will actually increase as you decrease the frequency. Part d) is show...

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