Search found 49 matches

by Megan Purl 1E
Sat Mar 17, 2018 1:00 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Closed systems
Replies: 2
Views: 269

Closed systems

Does the equation detla U = q+w only apply for closed systems?
by Megan Purl 1E
Fri Mar 16, 2018 1:57 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Collision Theory
Replies: 3
Views: 191

Collision Theory

How much are we going to have to know about collision theory for the final?
by Megan Purl 1E
Fri Mar 16, 2018 1:46 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Substitution Reactions
Replies: 2
Views: 156

Substitution Reactions

What is a substitution reaction and will we have to know it for the final?
by Megan Purl 1E
Fri Mar 16, 2018 1:30 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Collision model
Replies: 1
Views: 116

Collision model

What is the difference between a collision model and an activated complex model? Will we need to know it for the final?
by Megan Purl 1E
Fri Mar 16, 2018 12:25 pm
Forum: *Alkanes
Topic: Final
Replies: 13
Views: 1180

Final

Will we need to know functional groups for the final?
by Megan Purl 1E
Thu Mar 15, 2018 9:31 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: The Effect of Temperature
Replies: 3
Views: 130

The Effect of Temperature

What are the effects of raising the temperature on rate constants and rate equilibriums?
by Megan Purl 1E
Thu Mar 15, 2018 8:42 pm
Forum: Phase Changes & Related Calculations
Topic: Equipartition theorem
Replies: 1
Views: 184

Equipartition theorem

What is equipartition theorem and will we be expected to know it for the final?
by Megan Purl 1E
Thu Mar 15, 2018 8:42 pm
Forum: Phase Changes & Related Calculations
Topic: Origin of Internal Energy
Replies: 2
Views: 250

Origin of Internal Energy

For the final, are we going to have to know material from 8.7 about translational, rotational, and vibrational energies of molecules?
by Megan Purl 1E
Sun Mar 04, 2018 11:55 pm
Forum: Second Order Reactions
Topic: Rate of consumption vs concentration
Replies: 2
Views: 202

Rate of consumption vs concentration

What would the graph for rate of consumption vs concentration look like for a second order reaction?
by Megan Purl 1E
Sun Mar 04, 2018 11:54 pm
Forum: First Order Reactions
Topic: Rate of consumption vs concentration
Replies: 2
Views: 143

Rate of consumption vs concentration

What would the graph of rate of consumption vs concentration look like for a first order reaction?
by Megan Purl 1E
Sun Mar 04, 2018 11:52 pm
Forum: General Rate Laws
Topic: Rate laws and integrated rate laws
Replies: 3
Views: 183

Rate laws and integrated rate laws

What is the difference between rate laws and integrated rate laws?
by Megan Purl 1E
Sun Feb 25, 2018 11:40 pm
Forum: First Order Reactions
Topic: First order reactions vs second order reactions [ENDORSED]
Replies: 3
Views: 264

First order reactions vs second order reactions [ENDORSED]

What is the difference between a first-order reaction and a second-order reaction?
by Megan Purl 1E
Sun Feb 25, 2018 11:39 pm
Forum: Zero Order Reactions
Topic: Homework question
Replies: 2
Views: 154

Homework question

How would one express the units for rate constants when the concentrations are in moles per liter and time is in seconds for zero-order reactions?
by Megan Purl 1E
Sun Feb 25, 2018 11:36 pm
Forum: General Rate Laws
Topic: Differential rate law
Replies: 3
Views: 141

Differential rate law

What is the differential rate law and when will it be used?
by Megan Purl 1E
Mon Feb 19, 2018 11:33 pm
Forum: Balancing Redox Reactions
Topic: 14.1
Replies: 1
Views: 92

14.1

In the unbalanced redox reaction: H^{+}(aq) + Cr_2O_7 ^{2-} (aq) +C_2H_5OH(aq) {\rightarrow} Cr^{3+}(aq) + C_2H_4O(aq) + H_2O (l) For the final balanced reaction, which is 8H^{+}(aq) + Cr_2O_7 ^{-2} (aq) + 3C_2H_5OH (aq) \righta...
by Megan Purl 1E
Mon Feb 19, 2018 11:15 pm
Forum: Balancing Redox Reactions
Topic: Balancing redox reactions
Replies: 1
Views: 86

Balancing redox reactions

What are the steps for balancing a redox reaction?
by Megan Purl 1E
Mon Feb 19, 2018 11:13 pm
Forum: Balancing Redox Reactions
Topic: calculating oxidation states
Replies: 2
Views: 185

calculating oxidation states

How do you calculate the oxidation states of compounds within a redox reaction?
by Megan Purl 1E
Sun Feb 11, 2018 10:18 pm
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible
Replies: 2
Views: 152

Reversible vs Irreversible

How do the equations differ when calculating work for a system that is reversible vs a system that is irreversible?
by Megan Purl 1E
Sun Feb 11, 2018 10:16 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: delta S(system) vs delta S(surroundings)
Replies: 4
Views: 962

delta S(system) vs delta S(surroundings)

Under what conditions would delta S(sys) = -delta S(surr)?
by Megan Purl 1E
Sun Feb 11, 2018 10:13 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isothermic
Replies: 4
Views: 213

Isothermic

What is the difference between something that is isothermic, isochoric, isobaric and isometric?
by Megan Purl 1E
Sun Feb 04, 2018 10:45 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: 9.43
Replies: 2
Views: 154

9.43

Can someone help with this question?
Suppose that 50.0 g of H20(l) at 20.0 C is mixed with 65.0g of H20(l) at 50.0 C at constant atmospheric pressure in a thermally insulted vessel. Calculate delta S and delta S tot for the process.
by Megan Purl 1E
Sun Feb 04, 2018 10:39 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: 9.23
Replies: 1
Views: 147

9.23

Which would you expect to have a higher molar molar entropy at T=0, single crystals of BF3 or COF2? Why?
by Megan Purl 1E
Sun Feb 04, 2018 10:31 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Exothermic and Spontaneous
Replies: 4
Views: 551

Exothermic and Spontaneous

What is the difference between exothermic and spontaneous? Are all exothermic reactions spontaneous and are there times when endothermic reactions are spontaneous?
by Megan Purl 1E
Sun Jan 28, 2018 11:33 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Microstates [ENDORSED]
Replies: 3
Views: 234

Microstates [ENDORSED]

What are microstates or arrangements of atoms?
by Megan Purl 1E
Sun Jan 28, 2018 11:27 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Adiabatic system [ENDORSED]
Replies: 1
Views: 132

Adiabatic system [ENDORSED]

What is an adiabatic system and what would an example of an adiabatic system be?
by Megan Purl 1E
Sun Jan 28, 2018 11:26 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Reversible an Irreversible [ENDORSED]
Replies: 4
Views: 258

Reversible an Irreversible [ENDORSED]

What is the difference between a reversible and irreversible pathway? What makes a pathway reversible or irreversible, and can someone explain the meaning of the graphs of the two different pathways?
by Megan Purl 1E
Sun Jan 21, 2018 11:30 pm
Forum: Phase Changes & Related Calculations
Topic: enthalpy vs. heat
Replies: 2
Views: 118

Re: enthalpy vs. heat

Enthalpy is a state function because it is only dependent on the initial and final conditions; it is only depends on these conditions and not the path taken in order to reach these conditions. Meanwhile heat is path dependent therefore it is a path function. Think of it like position vs displacement...
by Megan Purl 1E
Sun Jan 21, 2018 10:37 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.49
Replies: 5
Views: 204

8.49

The question reads: OF2 (g) + H2O (g) --> O2 (g) + 2 HF (g) delta H = -318 kJ What is the change in internal energy for the reaction of 1.00 mol OF2? I understand the process of how to solve for this equation but in the solutions manual it solves using PV=nRT and it plugs in T as 298K. I was just wo...
by Megan Purl 1E
Sun Jan 21, 2018 10:29 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Constant Volume vs Constant Pressure
Replies: 2
Views: 100

Constant Volume vs Constant Pressure

How does the distinction between constant volume and constant pressure affect the calculations of heat and calorimetry? Which equations are used for constant volume and constant pressure?
by Megan Purl 1E
Mon Jan 15, 2018 9:26 pm
Forum: Phase Changes & Related Calculations
Topic: Expansion Work
Replies: 1
Views: 107

Expansion Work

What is the difference between expansion work and non-expansion work?
by Megan Purl 1E
Mon Jan 15, 2018 9:25 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 3
Views: 145

Hess's Law

What exactly is Hess's Law?
by Megan Purl 1E
Mon Jan 15, 2018 9:23 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Homework 8.29
Replies: 5
Views: 196

Homework 8.29

Which molecular substance do you expect to have the higher molar heat capacity, NO or NO2? why?
by Megan Purl 1E
Thu Dec 07, 2017 6:53 pm
Forum: Calculating the pH of Salt Solutions
Topic: Question 12.69
Replies: 1
Views: 246

Question 12.69

How do you find the pH of 0.055 M AlCl3?
by Megan Purl 1E
Sun Dec 03, 2017 11:10 pm
Forum: Bronsted Acids & Bases
Topic: Question 12.53
Replies: 1
Views: 112

Question 12.53

Suggest an explanation for the different strengths of a) acetic acid and trichloroacetic acid; b)acetic acid and formic acid.
by Megan Purl 1E
Sun Dec 03, 2017 11:08 pm
Forum: Bronsted Acids & Bases
Topic: Homework 12.49
Replies: 1
Views: 116

Homework 12.49

Which is the stronger base, the hypobromite ion, BrO-, or morphine, C17H19O3N? Justify your answer.
by Megan Purl 1E
Sun Nov 26, 2017 10:17 pm
Forum: Naming
Topic: 17.5
Replies: 1
Views: 132

17.5

Can someone help with question 17.5? It reads:
"Name and write formulas for d-metal complexes (Toolbox 17.1 and Example 17.1)
Thanks
by Megan Purl 1E
Sun Nov 26, 2017 10:15 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 2
Views: 130

Ligands

What are ligands?
by Megan Purl 1E
Sun Nov 26, 2017 10:11 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Diatomic Molecules
Replies: 2
Views: 208

Diatomic Molecules

Can someone explain what a heteronuclear diatomic molecule is?
by Megan Purl 1E
Sun Nov 26, 2017 10:10 pm
Forum: Hybridization
Topic: 4.41
Replies: 4
Views: 400

4.41

How do you do question 4.41? It reads: "Acrylonitrile, CH2CHCN, is used in the synthesis of acrylic fibers (polyacrylonitriles), such as Orlon. Write the Lewis structure of acrylonitrile and describe the hybrid orbitals on each carbon atom. What are the approximate values of the bond angles?&qu...
by Megan Purl 1E
Sun Nov 12, 2017 11:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Formula
Replies: 2
Views: 194

VSEPR Formula

Can someone please explain the VSEPR formula? What does each letter in AXnEm stand for?
by Megan Purl 1E
Sun Nov 12, 2017 11:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Question 4.25
Replies: 2
Views: 248

Question 4.25

Can someone help with the following question:
Write the Lewis Structure and predict whether each of the following molecules is polar or nonpolar: a) CH2Cl; b)CCl4; c)CS2; d)SF4.
by Megan Purl 1E
Sun Nov 05, 2017 4:49 pm
Forum: Lewis Structures
Topic: HW Question 3.41
Replies: 2
Views: 127

HW Question 3.41

Can someone explain how to do question 3.41 part c? Write the Lewis structure for clycine, H2C(NH2)COOH.
by Megan Purl 1E
Sun Nov 05, 2017 4:46 pm
Forum: Lewis Structures
Topic: Expanded Octets
Replies: 2
Views: 134

Expanded Octets

How can you tell if a molecule will have an expanded octet or not when drawing the Lewis structures?
by Megan Purl 1E
Sun Oct 22, 2017 11:40 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 2.13
Replies: 1
Views: 141

2.13

Can someone please explain 2.13? It reads: Describe the orientation of the lobes of the px-, py-, and pz- orbitals with respect to the reference Cartesian axes.
Thank you!
by Megan Purl 1E
Sun Oct 22, 2017 11:36 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: D Orbitals [ENDORSED]
Replies: 1
Views: 129

D Orbitals [ENDORSED]

So for P Orbitals Prof. Lavelle said to write the electron configuration as Px Py Pz (ex. 1s2 2s2 2px1 2py1). Do we have to do the same sort of notation for the D orbitals?
by Megan Purl 1E
Mon Oct 16, 2017 12:22 am
Forum: DeBroglie Equation
Topic: De Broglie relation [ENDORSED]
Replies: 1
Views: 198

De Broglie relation [ENDORSED]

If you are solving for the wavelength and the equation is wavelength = h/mv, the units for this equation is J.s/kg*m.s-1. How do the units cancel out to get m for the unit for wavelength?
by Megan Purl 1E
Sun Oct 15, 2017 9:16 pm
Forum: Properties of Light
Topic: Lyman vs Balmer Series
Replies: 4
Views: 208

Lyman vs Balmer Series

I don't understand how to determine the spectroscopic series to which a transition belongs. How can you tell if it's a Lyman series or Balmer series?
by Megan Purl 1E
Sun Oct 08, 2017 10:19 pm
Forum: Balancing Chemical Reactions
Topic: Limiting Reactant [ENDORSED]
Replies: 2
Views: 308

Re: Limiting Reactant [ENDORSED]

If all the reagents are added in exactly the right mole ratio then all of each reagent is used up, so there is no excess or limiting reagent. In this case you can use either reagent moles to work out the amount of product formed. then both reagents will be fully consumed so neither is limiting.
by Megan Purl 1E
Wed Oct 04, 2017 11:57 pm
Forum: Molarity, Solutions, Dilutions
Topic: Question L.35
Replies: 2
Views: 224

Question L.35

Can someone please help explain this problem to me. The question reads: Sodium bromide, NaBr, which is used to produce AgBr for use in photographic film, can itself be prepared as follows. Fe + Br2 --> FeBr2 FeBr2 + Br2 --> Fe3Br8 Fe3Br8 + Na2CO3 --> NaBr + CO2 + Fe3O4 What mass of iron, in kilogram...

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