Search found 49 matches
- Sat Mar 17, 2018 1:00 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Closed systems
- Replies: 2
- Views: 585
Closed systems
Does the equation detla U = q+w only apply for closed systems?
- Fri Mar 16, 2018 1:57 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Collision Theory
- Replies: 3
- Views: 541
Collision Theory
How much are we going to have to know about collision theory for the final?
- Fri Mar 16, 2018 1:46 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Substitution Reactions
- Replies: 2
- Views: 419
Substitution Reactions
What is a substitution reaction and will we have to know it for the final?
- Fri Mar 16, 2018 1:30 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Collision model
- Replies: 1
- Views: 337
Collision model
What is the difference between a collision model and an activated complex model? Will we need to know it for the final?
Final
Will we need to know functional groups for the final?
- Thu Mar 15, 2018 9:31 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: The Effect of Temperature
- Replies: 3
- Views: 431
The Effect of Temperature
What are the effects of raising the temperature on rate constants and rate equilibriums?
- Thu Mar 15, 2018 8:42 pm
- Forum: Phase Changes & Related Calculations
- Topic: Equipartition theorem
- Replies: 1
- Views: 417
Equipartition theorem
What is equipartition theorem and will we be expected to know it for the final?
- Thu Mar 15, 2018 8:42 pm
- Forum: Phase Changes & Related Calculations
- Topic: Origin of Internal Energy
- Replies: 2
- Views: 513
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?
- Sun Mar 04, 2018 11:55 pm
- Forum: Second Order Reactions
- Topic: Rate of consumption vs concentration
- Replies: 2
- Views: 453
Rate of consumption vs concentration
What would the graph for rate of consumption vs concentration look like for a second order reaction?
- Sun Mar 04, 2018 11:54 pm
- Forum: First Order Reactions
- Topic: Rate of consumption vs concentration
- Replies: 2
- Views: 498
Rate of consumption vs concentration
What would the graph of rate of consumption vs concentration look like for a first order reaction?
- Sun Mar 04, 2018 11:52 pm
- Forum: General Rate Laws
- Topic: Rate laws and integrated rate laws
- Replies: 3
- Views: 602
Rate laws and integrated rate laws
What is the difference between rate laws and integrated rate laws?
- Sun Feb 25, 2018 11:40 pm
- Forum: First Order Reactions
- Topic: First order reactions vs second order reactions [ENDORSED]
- Replies: 3
- Views: 908
First order reactions vs second order reactions [ENDORSED]
What is the difference between a first-order reaction and a second-order reaction?
- Sun Feb 25, 2018 11:39 pm
- Forum: Zero Order Reactions
- Topic: Homework question
- Replies: 2
- Views: 489
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?
- Sun Feb 25, 2018 11:36 pm
- Forum: General Rate Laws
- Topic: Differential rate law
- Replies: 3
- Views: 488
Differential rate law
What is the differential rate law and when will it be used?
- Mon Feb 19, 2018 11:33 pm
- Forum: Balancing Redox Reactions
- Topic: 14.1
- Replies: 1
- Views: 290
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...
- Mon Feb 19, 2018 11:15 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing redox reactions
- Replies: 1
- Views: 259
Balancing redox reactions
What are the steps for balancing a redox reaction?
- Mon Feb 19, 2018 11:13 pm
- Forum: Balancing Redox Reactions
- Topic: calculating oxidation states
- Replies: 2
- Views: 446
calculating oxidation states
How do you calculate the oxidation states of compounds within a redox reaction?
- Sun Feb 11, 2018 10:18 pm
- Forum: Calculating Work of Expansion
- Topic: Reversible vs Irreversible
- Replies: 2
- Views: 416
Reversible vs Irreversible
How do the equations differ when calculating work for a system that is reversible vs a system that is irreversible?
- 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: 15430
delta S(system) vs delta S(surroundings)
Under what conditions would delta S(sys) = -delta S(surr)?
- Sun Feb 11, 2018 10:13 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isothermic
- Replies: 4
- Views: 680
Isothermic
What is the difference between something that is isothermic, isochoric, isobaric and isometric?
- Sun Feb 04, 2018 10:45 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: 9.43
- Replies: 2
- Views: 481
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.
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.
- 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: 377
9.23
Which would you expect to have a higher molar molar entropy at T=0, single crystals of BF3 or COF2? Why?
- Sun Feb 04, 2018 10:31 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Exothermic and Spontaneous
- Replies: 4
- Views: 9904
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?
- Sun Jan 28, 2018 11:33 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Microstates [ENDORSED]
- Replies: 3
- Views: 623
Microstates [ENDORSED]
What are microstates or arrangements of atoms?
- Sun Jan 28, 2018 11:27 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Adiabatic system [ENDORSED]
- Replies: 1
- Views: 447
Adiabatic system [ENDORSED]
What is an adiabatic system and what would an example of an adiabatic system be?
- Sun Jan 28, 2018 11:26 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible an Irreversible [ENDORSED]
- Replies: 4
- Views: 802
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?
- Sun Jan 21, 2018 11:30 pm
- Forum: Phase Changes & Related Calculations
- Topic: enthalpy vs. heat
- Replies: 2
- Views: 338
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...
- Sun Jan 21, 2018 10:37 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 8.49
- Replies: 5
- Views: 618
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...
- Sun Jan 21, 2018 10:29 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Constant Volume vs Constant Pressure
- Replies: 2
- Views: 359
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?
- Mon Jan 15, 2018 9:26 pm
- Forum: Phase Changes & Related Calculations
- Topic: Expansion Work
- Replies: 1
- Views: 330
Expansion Work
What is the difference between expansion work and non-expansion work?
- 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: 338
Hess's Law
What exactly is Hess's Law?
- Mon Jan 15, 2018 9:23 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Homework 8.29
- Replies: 5
- Views: 545
Homework 8.29
Which molecular substance do you expect to have the higher molar heat capacity, NO or NO2? why?
- Thu Dec 07, 2017 6:53 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: Question 12.69
- Replies: 1
- Views: 397
Question 12.69
How do you find the pH of 0.055 M AlCl3?
- Sun Dec 03, 2017 11:10 pm
- Forum: Bronsted Acids & Bases
- Topic: Question 12.53
- Replies: 1
- Views: 2117
Question 12.53
Suggest an explanation for the different strengths of a) acetic acid and trichloroacetic acid; b)acetic acid and formic acid.
- Sun Dec 03, 2017 11:08 pm
- Forum: Bronsted Acids & Bases
- Topic: Homework 12.49
- Replies: 1
- Views: 389
Homework 12.49
Which is the stronger base, the hypobromite ion, BrO-, or morphine, C17H19O3N? Justify your answer.
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
"Name and write formulas for d-metal complexes (Toolbox 17.1 and Example 17.1)
Thanks
- Sun Nov 26, 2017 10:15 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligands
- Replies: 2
- Views: 316
Ligands
What are ligands?
- Sun Nov 26, 2017 10:11 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Diatomic Molecules
- Replies: 2
- Views: 521
Diatomic Molecules
Can someone explain what a heteronuclear diatomic molecule is?
- Sun Nov 26, 2017 10:10 pm
- Forum: Hybridization
- Topic: 4.41
- Replies: 4
- Views: 1979
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...
- Sun Nov 12, 2017 11:45 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Formula
- Replies: 2
- Views: 955
VSEPR Formula
Can someone please explain the VSEPR formula? What does each letter in AXnEm stand for?
- Sun Nov 12, 2017 11:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Question 4.25
- Replies: 2
- Views: 569
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.
Write the Lewis Structure and predict whether each of the following molecules is polar or nonpolar: a) CH2Cl; b)CCl4; c)CS2; d)SF4.
- Sun Nov 05, 2017 4:49 pm
- Forum: Lewis Structures
- Topic: HW Question 3.41
- Replies: 2
- Views: 261
HW Question 3.41
Can someone explain how to do question 3.41 part c? Write the Lewis structure for clycine, H2C(NH2)COOH.
- Sun Nov 05, 2017 4:46 pm
- Forum: Lewis Structures
- Topic: Expanded Octets
- Replies: 2
- Views: 336
Expanded Octets
How can you tell if a molecule will have an expanded octet or not when drawing the Lewis structures?
- Sun Oct 22, 2017 11:40 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 2.13
- Replies: 1
- Views: 219
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!
Thank you!
- Sun Oct 22, 2017 11:36 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: D Orbitals [ENDORSED]
- Replies: 1
- Views: 313
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?
- Mon Oct 16, 2017 12:22 am
- Forum: DeBroglie Equation
- Topic: De Broglie relation [ENDORSED]
- Replies: 1
- Views: 428
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?
- Sun Oct 15, 2017 9:16 pm
- Forum: Properties of Light
- Topic: Lyman vs Balmer Series
- Replies: 4
- Views: 593
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?
- Sun Oct 08, 2017 10:19 pm
- Forum: Balancing Chemical Reactions
- Topic: Limiting Reactant [ENDORSED]
- Replies: 2
- Views: 483
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.
- Wed Oct 04, 2017 11:57 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Question L.35
- Replies: 2
- Views: 692
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...