Search found 50 matches

by Robert Estrada
Fri Mar 16, 2018 2:21 pm
Forum: *Enzyme Kinetics
Topic: Question 15.85
Replies: 4
Views: 239

Re: Question 15.85

Thank You!
by Robert Estrada
Tue Mar 13, 2018 9:01 pm
Forum: *Enzyme Kinetics
Topic: Question 15.85
Replies: 4
Views: 239

Re: Question 15.85

How do we determine the molecularity given the rate laws?
by Robert Estrada
Tue Mar 13, 2018 9:01 pm
Forum: *Enzyme Kinetics
Topic: Question 15.85
Replies: 4
Views: 239

Question 15.85

The following rate laws were each derived from an elementary reaction. IN each case, write the chemical equation for the reaction, determine its molecularity, and draw a proposed structure for the activated complex: (A) Rate = k[CH3CHO](Products are CH3 and CHO) (B) Rate = k[I]^2[Ar](Products are I2...
by Robert Estrada
Thu Mar 08, 2018 9:24 pm
Forum: General Rate Laws
Topic: Question 15.39 [ENDORSED]
Replies: 4
Views: 129

Re: Question 15.39 [ENDORSED]

Thank you!
by Robert Estrada
Tue Mar 06, 2018 8:55 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Intermediates
Replies: 4
Views: 109

Re: Reaction Intermediates

Thank You!
by Robert Estrada
Tue Mar 06, 2018 8:47 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Reaction Intermediates
Replies: 4
Views: 109

Reaction Intermediates

Can someone quickly remind me of how we determine the reaction intermediates?
by Robert Estrada
Fri Mar 02, 2018 1:05 pm
Forum: General Rate Laws
Topic: Question 15.39 [ENDORSED]
Replies: 4
Views: 129

Re: Question 15.39 [ENDORSED]

Sorry forgot to post the problem, #39: Determine the time required for each of the following second order reactions to tale place: (A) 2A----> B +C, for the concentration of A to decrease from o.10 mol/L-1 to 0.090mol/L-1, given that k = 0.105L/mol-1/min-1 for the rate law expressed in terms of the ...
by Robert Estrada
Fri Mar 02, 2018 1:05 pm
Forum: General Rate Laws
Topic: Question 15.39 [ENDORSED]
Replies: 4
Views: 129

Question 15.39 [ENDORSED]

What equation do we use to determine the time required?
by Robert Estrada
Tue Feb 20, 2018 8:43 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Question 14.19
Replies: 4
Views: 137

Re: Question 14.19

Thanks Guys!
by Robert Estrada
Tue Feb 20, 2018 7:41 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Example 14.6 in Textbook, page 581 [ENDORSED]
Replies: 3
Views: 110

Re: Example 14.6 in Textbook, page 581 [ENDORSED]

are we supposed to derive these numbers from anywhere or would they be given?
by Robert Estrada
Tue Feb 20, 2018 7:39 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Example 14.6 in Textbook, page 581 [ENDORSED]
Replies: 3
Views: 110

Example 14.6 in Textbook, page 581 [ENDORSED]

can someone please explain example 14.6 in the textbook on page 581, more specifically where the -4 and -3 coefficients come from on the top of page 582 where
-4FE(B) = -3FE(C) + {-FE(D)}
by Robert Estrada
Thu Feb 15, 2018 8:42 pm
Forum: Student Social/Study Group
Topic: Sections on Test 2
Replies: 3
Views: 186

Re: Sections on Test 2

thanks!
by Robert Estrada
Thu Feb 15, 2018 8:23 pm
Forum: Student Social/Study Group
Topic: Sections on Test 2
Replies: 3
Views: 186

Sections on Test 2

Does anyone know what chapters/sections will be on test 2?
by Robert Estrada
Thu Feb 15, 2018 8:15 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Question 14.19
Replies: 4
Views: 137

Question 14.19

Can someone please explain question 19: a student was given a standard cu(s)ICu^2+(aq) half cell and another half cell containing an unknown metal M immersed in 1.00M M(NO3)2(aq); When the copper was connected as the anode at 25 degrees Celsius, the cell potential was found to be -0.689V. What is th...
by Robert Estrada
Sun Feb 11, 2018 8:34 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Question 9.21
Replies: 4
Views: 134

Re: Question 9.21

Thanks guys!
by Robert Estrada
Fri Feb 09, 2018 10:58 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Question 9.21
Replies: 4
Views: 134

Question 9.21

Can someone please explain question 21: Nanotechnologies have found ways to create and manipulate structures containing only a few molecules. However, orienting the molecule in specific ways to assemble such a structure can be difficult. Calculate the entropy of a solid nanostructure made of 64 mole...
by Robert Estrada
Fri Feb 02, 2018 1:10 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.85
Replies: 3
Views: 138

Re: 8.85

Thank You!
by Robert Estrada
Thu Feb 01, 2018 8:27 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.101 [ENDORSED]
Replies: 2
Views: 225

Question 8.101 [ENDORSED]

A technician carries out the reaction 2SO2(g) + O2(g)  2SO3(g) at 25°C and 1.00 atm in a constant-pressure cylinder fitted with a piston. Initially, 0.0300 mol SO2 and 0.0300 mol O2 are present in the cylinder. The technician then adds a catalyst to initiate the reaction. a. calculate the volume of...
by Robert Estrada
Thu Feb 01, 2018 8:20 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.85
Replies: 3
Views: 138

8.85

The oxidation of nitrogen in the hot exhaust of jet engines and automobile engines occurs by the reaction N2 (g) + O2 (g) ----> 2NO (g) ΔHº =+180.6kJ a. How much heat is absorbed by the formation of 1.55 mol of NO? b. How much heat is absorbed by the reaction of 5.45 L of nitrogen measured at 1.00 a...
by Robert Estrada
Tue Jan 23, 2018 6:52 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 8.51
Replies: 1
Views: 74

8.51

Can someone please explain how to start/set up #53? The reaction of 1.40g of carbon monoxide with excess water vapor to produce carbon dioxide and the hydrogen gasses in a bomb calorimeter causes the temperature of the calorimeter assembly to rise from 22.113 degrees Celsius to 22.700 degree celsius...
by Robert Estrada
Tue Jan 23, 2018 2:01 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 8.49
Replies: 2
Views: 94

Re: 8.49

Thank You!
by Robert Estrada
Tue Jan 23, 2018 1:38 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 8.49
Replies: 2
Views: 94

8.49

Oxygen Difluoride is colorless, very poisonous gas that reacts rapidly with water vapor to produce 02, HF, and heat:


What is the change in internal energy for the reaction of 1.00 mol OF2?
by Robert Estrada
Thu Jan 18, 2018 6:58 pm
Forum: Student Social/Study Group
Topic: Homework Questions
Replies: 1
Views: 256

Homework Questions

Does anyone know up to what question we should be comfortable solving from the syllabus/assigned homework based on what we have gone over in lecture?
by Robert Estrada
Thu Jan 18, 2018 6:55 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.23
Replies: 3
Views: 152

Re: 8.23

Thank You!
by Robert Estrada
Thu Jan 11, 2018 7:18 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 27
Replies: 2
Views: 72

Question 27

Could someone explain how you would setup number 27, " calculate the work for each of the following processes beginning with a gas sample in a piston assembly with T = 350 K, P = 1.79 atm and V = 4.29 L: (a) irreversible expansion against a constant external pressure of 1.00atm to a final volum...
by Robert Estrada
Thu Jan 11, 2018 7:14 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.23
Replies: 3
Views: 152

8.23

Can someone explain how to do #23 " a calorimeter was calibrated with an electric heater, which supplied 22.5kJ of energy as heat to the calorimeter and increased the temperature of the calorimeter and its water bath from 22.45 C to 23.97 C. What is the heat capacity of the calorimeter?" T...
by Robert Estrada
Thu Jan 11, 2018 7:09 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Question 8.35
Replies: 2
Views: 129

Question 8.35

Can someone please explain how to solve part b of this question regarding the density of the solid?
by Robert Estrada
Thu Dec 07, 2017 9:15 pm
Forum: Calculating the pH of Salt Solutions
Topic: 12.33
Replies: 1
Views: 236

12.33

Can someone explain the steps for question 33? A student added solid Na(2)O to a 200.0-mL volumetric flask, which was then filled with water, resulting in 200.0mL of NaOH solution. 5.00mL of the solution was then transferred to another volumetric flask and diluted to 500.0 mL. The pH of the diluted ...
by Robert Estrada
Thu Dec 07, 2017 9:09 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Question 12.55
Replies: 1
Views: 91

Question 12.55

Can someone please explain how you calculate the percentage deprotonation in question 55?
by Robert Estrada
Tue Nov 28, 2017 8:08 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Question 17.35
Replies: 1
Views: 140

Question 17.35

Can someone please explain how determine what isomers of diaminobenzene can form chelating compounds and why?
by Robert Estrada
Mon Nov 27, 2017 8:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.7
Replies: 5
Views: 247

Re: 11.7

How did you determine that flask 3 was the one at equilibrium?
by Robert Estrada
Sun Nov 19, 2017 9:40 pm
Forum: Dipole Moments
Topic: Question 4.29
Replies: 2
Views: 144

Question 4.29

Can someone explain #29?
The question is: there are three isomers of dicholorobenzene, C6H4Cl2+, which differ in the relative positions of the chlorine atoms on the benzene ring.(A) Which of the three forms are polar? (B) Which has the largest dipole moment?
Thanks!
by Robert Estrada
Sun Nov 19, 2017 9:36 pm
Forum: Hybridization
Topic: Question 41
Replies: 1
Views: 109

Question 41

Can someone explain #41 and the steps to solving it? 41. Acrylonitrile, CH2CHCN, is used in the synthesis of acrylic fibers such as Orlon. Write the Lewis structure of Acrylonitrile and describe the hybrid orbitals of each carbon atom. What are the approximate values of the bond angles? Thanks in ad...
by Robert Estrada
Thu Nov 16, 2017 6:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.27
Replies: 3
Views: 195

4.27

Can someone explain how you predict whether a molecule is more likely to be polar or non polar such as C5H5N?
by Robert Estrada
Thu Nov 16, 2017 6:10 pm
Forum: Hybridization
Topic: Hybrid Orbitals 4.31
Replies: 2
Views: 137

Hybrid Orbitals 4.31

Can someone explain how you determine the relative orientation of orbitals such as in 31

Question 31
State the relative orientations of the following hybrid orbitals: (a) sp3 (b) sp (c) sp3d2 (d) sp2
by Robert Estrada
Wed Nov 08, 2017 8:50 pm
Forum: Octet Exceptions
Topic: 3.55
Replies: 3
Views: 172

3.55

How do you tell if a species is a radical such as in question 55... is it a, b, c or d?
a. NO2-
b. CH3
c. OH
d.. CH2O
by Robert Estrada
Wed Nov 08, 2017 8:46 pm
Forum: Ionic & Covalent Bonds
Topic: 3.77
Replies: 2
Views: 120

3.77

Can someone please help me the this question and explain how you determeine whihc copounds has bonds with greater ionic character?
a. HCI or HI
b CH4 or CF4
c. CO2 or CS2
by Robert Estrada
Thu Nov 02, 2017 2:08 pm
Forum: Ionic & Covalent Bonds
Topic: Question 3.27
Replies: 2
Views: 149

Question 3.27

Can someone please explain #27 and how you find the chemical formulas?
a. thallium(III) oxide
b. manganese(II) chloride
c lithium nitride
by Robert Estrada
Sun Oct 29, 2017 8:32 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity [ENDORSED]
Replies: 3
Views: 213

Electron Affinity [ENDORSED]

Besides the general pattern of electron affinities being highest towards the right of the periodic table, how do you determine which elements have the highest affinity such as Chlorine vs. Bromide?
by Robert Estrada
Mon Oct 23, 2017 7:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Magnetic Numbers
Replies: 2
Views: 122

Magnetic Numbers

Can someone re-explain how we find the possible magnetic numbers?
by Robert Estrada
Mon Oct 23, 2017 7:20 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question 2.27
Replies: 1
Views: 105

Question 2.27

After you have figured out the subshell notation(like 6f), how or what do you use to figure out the number of orbitals having for each quantum number?

27.
Write the subshell notation and the number of orbitals having the following quantum numbers:
a. n=5, l=2
b. n=1, l=0
c. n=6, l=3
d. n=2, l=1
by Robert Estrada
Thu Oct 19, 2017 11:51 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Chapter 2 Question 3
Replies: 1
Views: 110

Chapter 2 Question 3

How would you find the magnetic number for each orbital in this question?
a)6p
b)3d
c)2p
d)5f
by Robert Estrada
Thu Oct 19, 2017 11:42 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.19 Part B
Replies: 5
Views: 220

2.19 Part B

Can someone please explain part b of 2.19?
How many values of m1 are allowed for an electron in a 6d-subshell?
Thank You
by Robert Estrada
Thu Oct 12, 2017 8:56 pm
Forum: Properties of Light
Topic: Hw #1.67
Replies: 1
Views: 151

Hw #1.67

Can someone please help with this question: A team of scientist recently developed a series of nanowires that can act as miniature lasers. a. one nanowire was found to emit light of frequency 6.27 x 10^14 Hz. What was the wavelength of the light emitted? b. A second nanowire was found to emit light ...
by Robert Estrada
Thu Oct 12, 2017 2:48 pm
Forum: Properties of Light
Topic: 1.27HW
Replies: 1
Views: 165

1.27HW

Can someone please help with this question:
A lamp rated at 32 W(1W=1 J*s^-1) emits violet light of wavelength 420nm. How many photons of violet light can the lamp generate in 2.0s? How many moles of photons are emitted in that time interval?
by Robert Estrada
Thu Oct 05, 2017 7:20 pm
Forum: Limiting Reactant Calculations
Topic: M6
Replies: 1
Views: 171

M6

Can someone please lay out the steps for me on M.6, I haven't got my solutions manual yet:
I'm having trouble with part B: estimating how many moles of each product will be produced and how many moles of the excess reactant will remain.
Thank You!
by Robert Estrada
Thu Oct 05, 2017 1:52 pm
Forum: SI Units, Unit Conversions
Topic: Do we need to memorize unit conversions? [ENDORSED]
Replies: 9
Views: 1196

Re: Do we need to memorize unit conversions? [ENDORSED]

Should we also have the 3 temperature conversions memorized?

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