## Search found 20 matches

Fri Dec 08, 2017 1:42 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Determining whether ligand is mono-, bi-, or polydentate
Replies: 3
Views: 341

### Determining whether ligand is mono-, bi-, or polydentate

How do you determine whether a ligand is monodentate, bidentate, or polydentate without drawing out its structure?
Fri Dec 08, 2017 1:32 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Delocalized pi bonding?
Replies: 1
Views: 178

### Delocalized pi bonding?

What exactly is delocalized pi bonding? Is it resonance?
Fri Dec 08, 2017 1:30 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc
Replies: 2
Views: 236

### Kc

What is the use of Kc when dealing with gases?
Fri Dec 08, 2017 1:29 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Significance of mono-, bi-, poly- dentate
Replies: 1
Views: 188

### Significance of mono-, bi-, poly- dentate

What is the significance of a ligand being monodentate, bidentate, polydentate? Why do we make this distinction?
Fri Dec 08, 2017 1:27 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Negative pH
Replies: 2
Views: 197

### Negative pH

Can you measure negative pH? (Not calculate, but measure physically)
Fri Dec 01, 2017 12:37 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Why is Kw value typically used at 25 degrees C [ENDORSED]
Replies: 6
Views: 837

### Why is Kw value typically used at 25 degrees C[ENDORSED]

Why is it standard to use the value for Kw at 25 degrees C?
Fri Dec 01, 2017 12:34 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH of solutions not at 25 degrees C
Replies: 2
Views: 355

### pH of solutions not at 25 degrees C

How would one ind the pH of a solution at a temperature other than 25 degrees C?
Does temperature change that?
Fri Nov 10, 2017 9:32 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity Exception
Replies: 3
Views: 1081

### Re: Electron Affinity Exception

Hi Karen. Nitrogen having a lower electron affinity compared to oxygen actually follows the periodic trend! You must be thinking of the exception between the electron affinity of carbon compared to the electron affinity of nitrogen. Following the trend, one would expect carbon to have a lower electr...
Fri Nov 10, 2017 9:20 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic & Nonpolar/polar
Replies: 3
Views: 636

### Re: Ionic & Nonpolar/polar

Hi Crystal! Ionic vs Covalent: A good rule of thumb to use when determining if a bond is ionic or covalent is to use the difference in the two atoms' electronegativity. If the difference is 2.0 or greater, it is ionic. If it is 1.5 or less, then it is covalent. For values in between 1.5 and 2.0, it ...
Sat Nov 04, 2017 12:08 am
Forum: Trends in The Periodic Table
Topic: chapter 3, 77
Replies: 1
Views: 173

### Re: chapter 3, 77

Hi! Electronegativity increases up a group. This is because as you go down a group, you can see that the atoms have a higher principal quantum number. This means that its outermost electrons are further away from the nucleus and held less tightly. Thus, electrons would not be as attracted to an atom...
Sat Nov 04, 2017 12:01 am
Forum: Lewis Structures
Topic: 3.67(b)
Replies: 2
Views: 222

### Re: 3.67(b)

Hi Kaylin. If you calculate formal charge, ClO2 does not have double bonds. With single bonds (the model shown in the solutions manual), the formal charges of each oxygen is -1 (so together, their charge is -2). The central chlorine atom has a formal charge of +2. This gives a total charge of 0, whi...
Sat Oct 28, 2017 12:41 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: anion vs. cation [ENDORSED]
Replies: 2
Views: 266

### Re: anion vs. cation[ENDORSED]

Hi Irma. There are really no other differences between a cation and an anion other than the ions' net charges (cations having an overall positive charge and anions having an overall negative charge). Other than that, you can sometimes predict whether an atom will form a cation or an anion by looking...
Tue Oct 24, 2017 12:00 am
Forum: Student Social/Study Group
Topic: De Neve Study Group
Replies: 2
Views: 449

### Re: De Neve Study Group

I'm in DeNeve and would love to form a study group! :-)
Mon Oct 23, 2017 2:03 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radii for Same Electron Config.
Replies: 2
Views: 313

### Atomic Radii for Same Electron Config.

Just a little confused...
Na+, Mg2+, F- have the same electron configuration. However, they have pretty different atomic radii.
Is this due to the charge of the nucleus?
Fri Oct 20, 2017 8:02 pm
Forum: Photoelectric Effect
Topic: Self test 1.5B part b
Replies: 1
Views: 255

### Self test 1.5B part b

Need help on this problem: b) The work function of zinc is 3.63 eV. What is the wavelength of the radiation that caused the photoejection of the electron? In part a), I found the kinetic energy of the ejected electron. It was 2.81 x 10^-19 J. I checked the answer in the back of the book, and that va...
Fri Oct 20, 2017 12:39 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 4s to 3d
Replies: 5
Views: 398

### 4s to 3d

Can someone explain why 4s comes before 3d despite 3d being slightly lower in energy compared to 4s?
Fri Oct 13, 2017 7:14 pm
Forum: Properties of Light
Topic: Prefix Conversion
Replies: 12
Views: 733

### Re: Prefix Conversion

I agree. It depends on the problem and the information given. However, usually, I convert before the problem because usually information/constants are given in meters :-)
Fri Oct 13, 2017 7:09 pm
Forum: Einstein Equation
Topic: 1.69 [ENDORSED]
Replies: 1
Views: 309

### 1.69[ENDORSED]

Need help on this problem from the textbook: 1.69) In a recent suspense film, two secret agents must penetrate a criminal's stronghold monitored by a lithium photomultiplier cell that is continually bathed in light from a laser. If the beam of light is broken, an alarm sounds. The agents want to use...
Thu Oct 05, 2017 3:28 pm
Forum: Balancing Chemical Reactions
Topic: Determining States of Matter in Reactions
Replies: 7
Views: 960

### Re: Determining States of Matter in Reactions

FOR CHEM 14A 2017 FALL:
do we need to write the states of matter in writing a chemical reaction?
furthermore, how does one decipher state of matter?
thanks
Thu Oct 05, 2017 3:06 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 8
Views: 1888

### Re: Sig Figs

I've always accepted and used sigfig rules, but why are they actually necessary? What is the purpose of sigfigs?