Search found 31 matches

by 605357751
Sun Dec 08, 2019 5:14 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH sig figs
Replies: 11
Views: 123

Re: pH sig figs

I believe you count two points are the decimal.
by 605357751
Sun Dec 08, 2019 5:13 pm
Forum: Calculating the pH of Salt Solutions
Topic: calculating pH
Replies: 2
Views: 84

Re: calculating pH

Okay thank you!
by 605357751
Sun Dec 08, 2019 5:12 pm
Forum: Calculating the pH of Salt Solutions
Topic: ph problem
Replies: 2
Views: 83

Re: ph problem

Thankyou this helped a lot!
by 605357751
Sat Dec 07, 2019 9:39 pm
Forum: Calculating the pH of Salt Solutions
Topic: ph problem
Replies: 2
Views: 83

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
by 605357751
Sat Dec 07, 2019 9:06 pm
Forum: Calculating the pH of Salt Solutions
Topic: calculating pH
Replies: 2
Views: 84

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.
by 605357751
Sat Nov 30, 2019 9:45 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination compounds
Replies: 1
Views: 31

Coordination compounds

For the final exam will we have to know how to draw coordination compounds?
by 605357751
Sat Nov 30, 2019 1:17 pm
Forum: Hybridization
Topic: Drawing Hybridization Orbitals
Replies: 3
Views: 31

Drawing Hybridization Orbitals

For the final exam will we have to draw hybrid orbital structures?
by 605357751
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: 37

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
by 605357751
Sun Nov 03, 2019 10:50 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Equations
Replies: 4
Views: 159

Re: Balancing Chemical Equations

Okay thank you so much, that really helped!
by 605357751
Sun Nov 03, 2019 10:49 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 4
Views: 155

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 =...
by 605357751
Sun Nov 03, 2019 10:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing the E book urgent
Replies: 1
Views: 31

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...
by 605357751
Sun Nov 03, 2019 10:07 pm
Forum: *Shrodinger Equation
Topic: quantization
Replies: 1
Views: 132

quantization

How does Schrodinger’s approach improve on Bohr’s explanation of quantization?
by 605357751
Sun Nov 03, 2019 9:57 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Equations
Replies: 4
Views: 159

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
by 605357751
Sun Oct 20, 2019 11:59 pm
Forum: *Black Body Radiation
Topic: electromagnetic radiation 2
Replies: 3
Views: 167

electromagnetic radiation 2

Problem 1.B.1 states:
Photons of radiofrequency radiation are higher in energy than photons of ultraviolet radiation. Why is this statement false?
by 605357751
Sun Oct 20, 2019 11:57 pm
Forum: *Black Body Radiation
Topic: electromagnetic radiation
Replies: 2
Views: 113

electromagnetic radiation

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?
by 605357751
Sun Oct 20, 2019 11:50 pm
Forum: Photoelectric Effect
Topic: KE energy & intensity
Replies: 5
Views: 66

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.
by 605357751
Sun Oct 20, 2019 11:46 pm
Forum: Properties of Light
Topic: Finding Photons
Replies: 2
Views: 64

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...
by 605357751
Sun Oct 20, 2019 11:38 pm
Forum: Properties of Light
Topic: calculating frequency of light
Replies: 4
Views: 83

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
by 605357751
Sun Oct 06, 2019 11:15 pm
Forum: Limiting Reactant Calculations
Topic: Reducing reactants
Replies: 2
Views: 60

Re: Reducing reactants

Got it! Thank you!
by 605357751
Sun Oct 06, 2019 11:14 pm
Forum: Limiting Reactant Calculations
Topic: thereotical yield
Replies: 5
Views: 78

thereotical yield

Does the theoretical yield always have to be in grams?
by 605357751
Sun Oct 06, 2019 10:38 pm
Forum: Limiting Reactant Calculations
Topic: Step two in limiting reactants
Replies: 3
Views: 75

Re: Step two in limiting reactants

okay thank you for your response!
by 605357751
Sun Oct 06, 2019 10:37 pm
Forum: Limiting Reactant Calculations
Topic: Reducing reactants
Replies: 2
Views: 68

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...
by 605357751
Sun Oct 06, 2019 10:37 pm
Forum: Limiting Reactant Calculations
Topic: Reducing reactants
Replies: 2
Views: 60

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...
by 605357751
Sun Oct 06, 2019 3:35 pm
Forum: Limiting Reactant Calculations
Topic: Step two in limiting reactants
Replies: 3
Views: 75

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...

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