Search found 21 matches

by Kevin Hernandez 3A
Sun Dec 10, 2017 8:39 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Replies: 1
Views: 329

Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions

23. At 500. K, the equilibrium constant, Kc, equals 1.0 x 1012 for: 2 SO2 (g) + O2 (g) ⇌ 2 SO3 (g) If analysis shows that the composition is 5.0 M for SO3, 0.50 mM for SO2, and 0.20 mM for O2, is this reaction at equilibrium? If not, in which direction does the reaction tend to proceed to reach equi...
by Kevin Hernandez 3A
Sat Dec 09, 2017 1:11 am
Forum: DeBroglie Equation
Topic: DeBroglie Equation
Replies: 1
Views: 197

DeBroglie Equation

33. Calculate the de Broglie wavelength of an electron (mass = 9.11 x 10-31 kg) traveling at 5.3 x 106 m.s-1? Do you think your calculated wavelength, for electrons with similar velocities, could be experimentally verified/detected in the lab?
by Kevin Hernandez 3A
Fri Dec 08, 2017 12:51 am
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant Calculations [ENDORSED]
Replies: 3
Views: 368

Limiting Reactant Calculations [ENDORSED]

20. How many moles of CO2(g) are produced when 1 kg of CaCO3(s) is used to neutralize an acid spill? The equation for the reaction at 1 atm and 25 degrees C is:

CaCO3(s) + H2SO4(aq) ---> CaSO4(s) + CO2(g) + H2O(l)

How do we know that CaCO3 is the limiting reagent?
by Kevin Hernandez 3A
Tue Nov 28, 2017 3:27 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Non-Equilibrium Conditions & The Reaction Quotient
Replies: 2
Views: 346

Non-Equilibrium Conditions & The Reaction Quotient

If the initial amounts of CO and H2O were both 0.100 M, what will be the amounts of each reactant and product at equilibrium for the following reaction? Keq = 23.2 at 600K
CO (g) + H2O (g) ⇌ CO2 (g) + H2 (g)
by Kevin Hernandez 3A
Tue Nov 28, 2017 1:59 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE box
Replies: 1
Views: 143

ICE box

A researcher fills a 1.00 L reaction vessel with 1.84 x 10-4 mol of BrCl gas and heats it to 500 K. At equilibrium, only 18.3 % of the BrCl gas remains. Calculate the equilibrium constant, assuming the following reaction is taking place.
2BrCl(g) ⇌ Br2 (g) + Cl2(g)
by Kevin Hernandez 3A
Tue Nov 28, 2017 1:26 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction quotient
Replies: 1
Views: 251

Reaction quotient

At 500. K, the equilibrium constant, Kc, equals 1.0 x 1012 for: 2 SO2 (g) + O2 (g) ⇌ 2 SO3 (g) If analysis shows that the composition is 5.0 M for SO3, 0.50 mM for SO2, and 0.20 mM for O2, is this reaction at equilibrium? If not, in which direction does the reaction tend to proceed to reach equilibr...
by Kevin Hernandez 3A
Tue Nov 28, 2017 12:03 am
Forum: Ideal Gases
Topic: Partial pressures
Replies: 4
Views: 488

Partial pressures

The reaction 2 SO2 (g) + O2 (g) ⇌ 2 SO3 (g) occurs in a 1.00 L flask at 312 K and at equilibrium the concentrations are 0.075 mol.L-1 SO2 (g), 0.537 mol.L-1 O2 (g), and 0.925 mol.L-1 SO3 (g). Calculate their respective partial pressures at 312 K using R = 8.206 × 10-2 L.atm.K-1.mol-1.
by Kevin Hernandez 3A
Mon Nov 27, 2017 10:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical Equlibrium
Replies: 1
Views: 163

Chemical Equlibrium

Why are equilibrium constants useful? A. One number that gives us information about the relative concentrations of reactant and product. B. One number that gives us information about the relative production rates of reactant and product. C. One number that gives us information about the relative act...
by Kevin Hernandez 3A
Mon Nov 27, 2017 10:30 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical Equlibrium
Replies: 2
Views: 219

Chemical Equlibrium

Why are equilibrium constants useful? A. One number that gives us information about the relative concentrations of reactant and product. B. One number that gives us information about the relative production rates of reactant and product. C. One number that gives us information about the relative act...
by Kevin Hernandez 3A
Wed Nov 08, 2017 12:50 am
Forum: Molarity, Solutions, Dilutions
Topic: Molarity, Solutions, Dilutions [ENDORSED]
Replies: 1
Views: 243

Molarity, Solutions, Dilutions [ENDORSED]

A 1.000g sample of XI2 is dissolved in water, and excess silver nitrate (AgNO3) is added to precipitate all of the iodide as AgI. The mass of the dry AgI is found to be 1.597g. What is the identity of X2+?
by Kevin Hernandez 3A
Wed Nov 08, 2017 12:34 am
Forum: Molarity, Solutions, Dilutions
Topic: molarity [ENDORSED]
Replies: 1
Views: 213

molarity [ENDORSED]

A solution is prepared by dissolving 0.500 g KCL, 0.500 g K2S, and 0.500 g K3PO4 in 0.500 L water. What is the concentration in the final solution of (a) potassium ions; (b) sulfide (S2-) ions?
by Kevin Hernandez 3A
Mon Oct 30, 2017 10:38 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: problem help
Replies: 5
Views: 1127

Re: problem help

You are caught in a radar trap and hope to show that the speed measured by the radar gun is in error due to the Heisenberg uncertainty principle. If you assume that the uncertainty in your position was +/- 5 m when your speed was measured, and that the car has a mass of 2150 kg, what is your calcul...
by Kevin Hernandez 3A
Mon Oct 30, 2017 10:33 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: uncertainty in kinetic energy
Replies: 4
Views: 2315

Re: uncertainty in kinetic energy

delta v= 3.4x10^10m.s-1(from pervious problem) (9.11x10^-31kg.e-)(6.022x10^23)=5.49x10^-7kg.mol

KE=1/2(9.11x10^-31kg.e-)(3.4x10^10m.s-1)^2 KE=1/2(5.49x10^-7kg.mol)(3.4x10^10m.s-1)^2
KE=5.3x10^-10J/e- KE=3.2x10^14J/mol
by Kevin Hernandez 3A
Mon Oct 30, 2017 9:28 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy (Uncertainty) Equation
Replies: 1
Views: 225

Heisenberg Indeterminacy (Uncertainty) Equation

Calculate the uncertainty (indeterminacy) in position of an electron if its uncertainty in speed is one hundredth the speed of light?

to calculate deltaV would you multiple 3.00x10^8 (0.01)?
by Kevin Hernandez 3A
Mon Oct 30, 2017 5:13 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy (Uncertainty) Equation
Replies: 2
Views: 440

Heisenberg Indeterminacy (Uncertainty) Equation

The hydrogen atom has a radius of approximately 0.05 nm. Assume that we know the position of an electron to an accuracy of 1 % of the hydrogen radius, calculate the uncertainty in the speed of the electron using the Heisenberg uncertainty principle. Comment on your value obtained. How would we deter...
by Kevin Hernandez 3A
Sat Oct 14, 2017 4:12 pm
Forum: Photoelectric Effect
Topic: Photoelectric effect [ENDORSED]
Replies: 5
Views: 523

Photoelectric effect [ENDORSED]

This and the following question relates to the same metal used in a series of photoelectric experiments. A. If 3.607 x 10-19 J is required to remove an electron with zero kinetic energy from a metal surface, what would be the longest wavelength light that could do this? a) KE= energy of photon - wor...
by Kevin Hernandez 3A
Sat Oct 14, 2017 3:48 pm
Forum: Photoelectric Effect
Topic: How to calculate the kinetic energy, energy and frequency? [ENDORSED]
Replies: 16
Views: 4158

Re: How to calculate the kinetic energy, energy and frequenc [ENDORSED]

The steps to solve the problem are: 1. Use Ek = 1/2 mv^2 2. 2. Divide the total energy (work function) by Avogadro's number. 3. Use: kinetic energy of e- = energy of incoming photon – work function ****In addition to covering this in class, the course reader has detailed examples as does the textbo...
by Kevin Hernandez 3A
Wed Oct 04, 2017 7:43 pm
Forum: Limiting Reactant Calculations
Topic: What is the mass of AgCl produced?
Replies: 10
Views: 4302

Re: What is the mass of AgCl produced?

After calculating the moles, how do you determine which is the limiting reactant. I know you have to compare the ratios however, I am not sure on what I'm looking for.
by Kevin Hernandez 3A
Wed Oct 04, 2017 7:26 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity and Dilution
Replies: 10
Views: 3073

Re: Molarity and Dilution

Why is this problem not a Mi * Vi= Mf* Vf, if it is giving you the final volume (125ml).

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