## Search found 31 matches

Sun Dec 08, 2019 5:14 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH sig figs
Replies: 11
Views: 166

### Re: pH sig figs

I believe you count two points are the decimal.
Sun Dec 08, 2019 5:13 pm
Forum: Calculating the pH of Salt Solutions
Topic: calculating pH
Replies: 2
Views: 104

### Re: calculating pH

Okay thank you!
Sun Dec 08, 2019 5:12 pm
Forum: Calculating the pH of Salt Solutions
Topic: ph problem
Replies: 3
Views: 110

### Re: ph problem

Thankyou this helped a lot!
Sat Dec 07, 2019 9:39 pm
Forum: Calculating the pH of Salt Solutions
Topic: ph problem
Replies: 3
Views: 110

### ph problem

I am working on a practice problem that says:

Calculate the pH of a 0.20M solution of HC2H302 with Ka = . 1.8 x 10^-5

After solving for pH, pH = -log [ H+] ---> pH = -log [ 1.8 x 10^-5] I got 4.74 but the answer is 2.72.

Can someone help me find where I went wrong
Sat Dec 07, 2019 9:06 pm
Forum: Calculating the pH of Salt Solutions
Topic: calculating pH
Replies: 2
Views: 104

### calculating pH

I am having trouble solving this problem,

Calculate the pH of 0.15 NH4Cl?

so first, I made a ICE table and for Ka I got (x^2)/(0.15 -x) and I do not know how to solve for x from there.
Sat Nov 30, 2019 9:45 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination compounds
Replies: 1
Views: 53

### Coordination compounds

For the final exam will we have to know how to draw coordination compounds?
Sat Nov 30, 2019 1:17 pm
Forum: Hybridization
Topic: Drawing Hybridization Orbitals
Replies: 3
Views: 40

### Drawing Hybridization Orbitals

For the final exam will we have to draw hybrid orbital structures?
Mon Nov 18, 2019 10:26 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: hydrogen bonds
Replies: 4
Views: 54

### hydrogen bonds

Are hydrogen bonds also considered a dipole dipole interaction?
Mon Nov 18, 2019 10:16 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: ion dipole interactions
Replies: 3
Views: 71

### ion dipole interactions

Do ion atoms dissolve in molecules that have dipole forces(polar molecules) ?

for example, CL- and H20? I know the rule is that that "like dissolves like" but in this case is an ion polar? Im confused
Sun Nov 17, 2019 9:58 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: This Week Test
Replies: 12
Views: 176

### Re: This Week Test

Can someone tell me which section of hw problems will be on the test please.
Sun Nov 17, 2019 9:49 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: london forces
Replies: 5
Views: 55

### Re: london forces

Thank you, that makes sense.
Sun Nov 17, 2019 9:47 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: covalent vs hydrogen bond?
Replies: 2
Views: 28

### Re: covalent vs hydrogen bond?

Thank you, that helps a lot!
Sun Nov 17, 2019 9:46 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: intermolecular forces
Replies: 2
Views: 21

### intermolecular forces

Why are some forces permanent and others are not?
Sun Nov 17, 2019 9:40 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: london forces
Replies: 5
Views: 55

### london forces

Why do all/most atoms have London dispersion forces?
Sun Nov 17, 2019 9:37 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: covalent forces
Replies: 1
Views: 24

### covalent forces

what is the difference between covalent and non covalent forces?
Sun Nov 03, 2019 10:50 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Equations
Replies: 4
Views: 194

### Re: Balancing Chemical Equations

Okay thank you so much, that really helped!
Sun Nov 03, 2019 10:49 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 4
Views: 247

### Quantum Numbers

I have difficulty understanding the rules of quantum numbers, can someone explain why some combinations are allowed and others are not. State if the following combinations of quantum numbers are allowed or not in a one-electron atom. For those that are disallowed state briefly why not. a) n = 4, l =...
Sun Nov 03, 2019 10:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E book urgent
Replies: 1
Views: 35

### Accessing the E book urgent

I had bought the e book on the Macmillan website and I have been using it since class started. I just tried to open up the ebook and it will not let me do so. I do not know if it has anything to do with the announcement that Dr. Lavelle made that we could switch the access code at the bookstore. How...
Sun Nov 03, 2019 10:07 pm
Forum: *Shrodinger Equation
Topic: quantization
Replies: 1
Views: 143

### quantization

How does Schrodinger’s approach improve on Bohr’s explanation of quantization?
Sun Nov 03, 2019 9:57 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Equations
Replies: 4
Views: 194

### Balancing Chemical Equations

Hi all,

I have been trying to balance this equation and I can not seem to figure it out.

__ NH4ClO4 + __ Al → __ Al2O3 + __ N2 + __ HCl + __ H2O
Sun Oct 20, 2019 11:59 pm
Replies: 4
Views: 215

Problem 1.B.1 states:
Photons of radiofrequency radiation are higher in energy than photons of ultraviolet radiation. Why is this statement false?
Sun Oct 20, 2019 11:57 pm
Replies: 2
Views: 135

Problem 1.B.1 states:
The total intensity of radiation emitted from a black body at absolute temperature T is directly proportional to the temperature. Why is this statement false?
Sun Oct 20, 2019 11:50 pm
Forum: Photoelectric Effect
Topic: KE energy & intensity
Replies: 5
Views: 72

### KE energy & intensity

Can someone please further explain how the KE of emitted electrons depends on the frequency of incoming light and not intensity of incoming light.
Sun Oct 20, 2019 11:46 pm
Forum: Properties of Light
Topic: Finding Photons
Replies: 2
Views: 66

### Finding Photons

Im am really confused in a example problem: A lamp rated at 32W(1W = 1 J/s) emits violet light of wavelength 420 nm. How many photons of violet light can the lamp generate in 2.0s? I started with this set up: E=(6.626 x 10^-34) (3.00 x 10^8m/s / 4.0 x 10^-7m) and I got 4.7328 x 10^-19 J/p. I don't k...
Sun Oct 20, 2019 11:38 pm
Forum: Properties of Light
Topic: calculating frequency of light
Replies: 4
Views: 120

### calculating frequency of light

In a problem in which only the work function is given to calculate the lowest frequency of light that will cause photoelectric emission, do we assume that the KE is 0?

ex: The work function for lithium is 4.6 x 10^-19J. Calculate the lowest frequency of light that will cause photoelectric emission
Sun Oct 06, 2019 11:15 pm
Forum: Limiting Reactant Calculations
Topic: Reducing reactants
Replies: 2
Views: 61

### Re: Reducing reactants

Got it! Thank you!
Sun Oct 06, 2019 11:14 pm
Forum: Limiting Reactant Calculations
Topic: thereotical yield
Replies: 5
Views: 80

### thereotical yield

Does the theoretical yield always have to be in grams?
Sun Oct 06, 2019 10:38 pm
Forum: Limiting Reactant Calculations
Topic: Step two in limiting reactants
Replies: 3
Views: 79

### Re: Step two in limiting reactants

okay thank you for your response!
Sun Oct 06, 2019 10:37 pm
Forum: Limiting Reactant Calculations
Topic: Reducing reactants
Replies: 2
Views: 71

### Reducing reactants

In self test M1.b, the question says "Reduction of 15 kg of iron(III) oxide in a blast furnace produced 8.8 kg of iron in the reaction Fe2O3 (s) + 3CO(g)→ 2 Fe (s) + 3 CO 2 (g). What is the percentage yield of iron?" If the question were to not include the balanced equation how would we go...
Sun Oct 06, 2019 10:37 pm
Forum: Limiting Reactant Calculations
Topic: Reducing reactants
Replies: 2
Views: 61

### Reducing reactants

In self test M1.b, the question says "Reduction of 15 kg of iron(III) oxide in a blast furnace produced 8.8 kg of iron in the reaction Fe2O3 (s) + 3CO(g)→ 2 Fe (s) + 3 CO 2 (g). What is the percentage yield of iron?" If the question were to not include the balanced equation how would we go...
Sun Oct 06, 2019 3:35 pm
Forum: Limiting Reactant Calculations
Topic: Step two in limiting reactants
Replies: 3
Views: 79

### Step two in limiting reactants

Example 1 of section M in the fundamentals part of the textbook, the balanced equation of the reaction is 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O. In the step 2 the problem says to use the mole ratio derived from the stoichiometric coefficients in the balanced equation, to convert from the amount of C8H...