## Search found 30 matches

Fri Dec 07, 2018 9:34 am
Forum: Bronsted Acids & Bases
Topic: Exceptions: HSO4- and H2PO4-
Replies: 4
Views: 293

### Re: Exceptions: HSO4- and H2PO4-

Is H2PO4- a polyprotic acid? What makes something polyprotic?
Mon Dec 03, 2018 8:42 pm
Forum: Conjugate Acids & Bases
Topic: Ion concentration
Replies: 2
Views: 121

### Re: Ion concentration

Since pH/pOH can be measured by -log[H3O+] or -log[OH-], we can use the inverse log to find the ion concentration if we are given the pH.
Mon Dec 03, 2018 8:35 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: ph vs pOH
Replies: 5
Views: 240

### Re: ph vs pOH

pH measures the H+ concentration and pOH measures the OH- concentration.
Mon Dec 03, 2018 8:31 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Ka
Replies: 1
Views: 97

### Re: Ka

The Ka can tell us whether something is a strong or weak acid. It tells us how much the acid dissociates.

I don't think that Ka calculations will be on the final.
Mon Dec 03, 2018 8:27 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands and Lewis bases
Replies: 3
Views: 193

### Re: Ligands and Lewis bases

I'm not completely sure if they are interchangeable, but ligands act like Lewis bases because they donate are electron pair donors.
Mon Dec 03, 2018 8:21 pm
Forum: Naming
Topic: 6th Edition 29c
Replies: 3
Views: 109

### Re: 6th Edition 29c

Table 17.1 says that ligands are named in alphabetical order, and since water is a ligand in this case, -aqua is the first term.
Fri Nov 23, 2018 1:57 pm
Forum: Sigma & Pi Bonds
Topic: Double Bonds
Replies: 9
Views: 552

### Double Bonds

Can double bonds have both sigma and pi bonds?
Fri Nov 23, 2018 1:53 pm
Forum: Hybridization
Topic: HW Problem 43
Replies: 1
Views: 90

### Re: HW Problem 43

Because there are more "s" characters. sp2 has a greater s character than sp3, and the bond angle increased.
Fri Nov 23, 2018 1:49 pm
Forum: Dipole Moments
Topic: Dipole-dipole & dipole-induced dipole
Replies: 1
Views: 104

### Re: Dipole-dipole & dipole-induced dipole

I am also confused because wouldn't dipole induced dipole be weaker than dipole-dipole?
Fri Nov 23, 2018 1:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Can the electronegativities of central/non-central atoms affect the bond angle?
Replies: 2
Views: 116

### Re: Can the electronegativities of central/non-central atoms affect the bond angle?

I think that sounds right because the more electronegative an atom is the more likely it will pull the electron cloud to itself --> lowers bond angle
Fri Nov 23, 2018 1:36 pm
Forum: Dipole Moments
Topic: Relationship between atomic size and attractive forces
Replies: 2
Views: 134

### Re: Relationship between atomic size and attractive forces

I think that the London dispersion forces in I2 are stronger, so the bonds are tighter.
Fri Nov 23, 2018 1:29 pm
Forum: Dipole Moments
Topic: CH4 vs CCl4
Replies: 1
Views: 88

### Re: CH4 vs CCl4

More electrons increases the strength of the London Dispersion forces that hold the bonds together
Sun Nov 11, 2018 4:33 pm
Forum: Lewis Structures
Topic: Hypervalent compound vs variable covalence
Replies: 2
Views: 164

### Re: Hypervalent compound vs variable covalence

Can someone explain variable covalency please? Thank you!
Sun Nov 11, 2018 4:27 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: Dissociation Energy
Replies: 1
Views: 92

### Re: Dissociation Energy

Breaking bonds usually requires an energy input, so the dissociation energy is always positive.
Sun Nov 11, 2018 4:22 pm
Forum: Properties of Light
Topic: Test 3
Replies: 24
Views: 892

### Re: Test 3

I'm guessing that it would include material from Outlines 3 and 4, so chemical bonds and shape/structure.
Fri Nov 02, 2018 8:04 pm
Forum: Octet Exceptions
Topic: octet exceptions
Replies: 4
Views: 178

### Re: octet exceptions

I think that it's because elements (ex:Cl, S, etc) that are able to have expanded octets can use the 3d subshell.
Fri Nov 02, 2018 7:56 pm
Forum: Resonance Structures
Topic: Resonance structures on the midterm
Replies: 3
Views: 189

### Re: Resonance structures on the midterm

I think we'd have to put the 'best' resonance structure (ex: the one with formal charges of 0)
Fri Nov 02, 2018 7:45 pm
Forum: Photoelectric Effect
Topic: Chem Test 2, #5 b
Replies: 4
Views: 287

### Re: Chem Test 2, #5 b

I think that light is emitted because we are going from a higher energy level to lower energy level.
Thu Oct 25, 2018 9:27 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Degeneracy
Replies: 6
Views: 260

### Re: Degeneracy

all the orbitals of a shell have the same energy
Thu Oct 25, 2018 9:25 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic Atoms
Replies: 4
Views: 151

### Re: Isoelectronic Atoms

I think that even though the number of electrons is the same, the number of protons is still different. and the protons pull the electrons closer to the nucleus --> different radii
Thu Oct 25, 2018 9:14 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Module Question #17
Replies: 4
Views: 271

### Re: Module Question #17

I think it's because 3.0x10^6 has 1 sig fig.
Wed Oct 17, 2018 4:58 pm
Forum: Properties of Light
Topic: energy equation
Replies: 4
Views: 134

### Re: energy equation

did you mean E = hc/λ?
Wed Oct 17, 2018 4:55 pm
Forum: Quantum Numbers and The H-Atom
Topic: Principal Quantum Number (n)
Replies: 3
Views: 140

### Re: Principal Quantum Number (n)

n can tell us the size and energy of the orbital
l can tell us the shape of the orbital, and the orbital type (s,p,d,f) changes with different values of l (0,1,2,3)
ml tells us the orientation in space
ms is the spin magnetic quantum number and tells us if there is a clockwise or counterclockwise spin
Tue Oct 16, 2018 9:31 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.29
Replies: 1
Views: 113

### 2.29

How many electrons can have the following quantum numbers in an atom?
(part b) n=4,l=2,ml= -2
(part d) n=3, l=2,ml= +1

How does the magnetic quantum number affect the number of electrons?
Sat Oct 13, 2018 9:13 pm
Forum: Photoelectric Effect
Topic: Problem 33 Chapter 1
Replies: 1
Views: 57

### Re: Problem 33 Chapter 1

I think it depends on what is given in the question. For this problem, the velocity is given, so we know that we are probably going to use an equation that relates to velocity. In this case, the DeBroglie works because it is (Lambda = h/p), where momentum, p, = mv. I don't think E = h*nu would work ...
Sat Oct 13, 2018 8:49 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer Series
Replies: 2
Views: 95

### Balmer Series

For the Balmer series, is n=2 considered the ground state?

Also, will electrons always return to the ground state -- for example can they go from n=4 to n=3 instead of n=4 all the way down to n=1? If they don't go down all the way to ground, does this mean that no electrons given off?
Sat Oct 13, 2018 8:13 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: HW #1.43
Replies: 8
Views: 619

### Re: HW #1.43

On the solutions manual, one of the values is h_bar= 1.054 457 * 10^-34 J/s. Does anyone know where they are getting this number from?
Fri Oct 05, 2018 10:38 pm
Forum: Limiting Reactant Calculations
Topic: L7
Replies: 2
Views: 76

### Re: L7

I think the steps should be the same, because combustion is an oxidation reaction
Fri Oct 05, 2018 10:23 pm
Forum: Limiting Reactant Calculations
Topic: M.9
Replies: 2
Views: 94

### Re: M.9

I think that 0.0800 mol NaOH is required to react with the Cu(NO3)2, but when we calculate how many moles we actually have by converting the 2.00 g to mol, we find that we only have 0.0500 available.
Fri Oct 05, 2018 9:19 pm
Forum: Balancing Chemical Reactions
Topic: States of Matter
Replies: 11
Views: 426

### Re: States of Matter

It doesn't help with balancing, but It helps you figure out what type of reaction is occurring (ex: combustion reactions using O2 gas as a reactant)

Go to advanced search