Search found 101 matches
- Tue Mar 10, 2020 11:14 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Difference between catalyst and intermediate
- Replies: 9
- Views: 623
Difference between catalyst and intermediate
In problems, where they give us a slow and fast reaction, how do you determine which variable is a catalyst and which is a intermediate step?
- Tue Mar 10, 2020 11:04 pm
- Forum: Administrative Questions and Class Announcements
- Topic: review sessions and office hours
- Replies: 6
- Views: 506
Re: review sessions and office hours
From a UA, all step up sessions may be cancelled because they are leaving campus as well.
- Tue Mar 10, 2020 11:01 pm
- Forum: General Rate Laws
- Topic: Help on 7A.15(d)
- Replies: 1
- Views: 191
Help on 7A.15(d)
For part D, it asks for us to predict the initial rate for experiment 5. I have already found the rate law and got a value for the reaction rate constant. Are we supposed to just plug everything in from experiment 5? Can someone explain the steps on how to solve part d?
- Tue Mar 10, 2020 10:49 pm
- Forum: General Rate Laws
- Topic: Help on 7A.13
- Replies: 1
- Views: 187
Help on 7A.13
Can someone explain how to do this problem. How does the factor of 1.2 affect the equation? 7A.13 In the reaction CH3Br(aq)1OH2(aq)SCH3OH(aq)1 Br2(aq), when the OH2 concentration alone was doubled, the rate doubled; when the CH3Br concentration alone was increased by a factor of 1.2, the rate increa...
- Tue Mar 10, 2020 10:38 pm
- Forum: General Rate Laws
- Topic: Difference between initial reaction rate vs reaction rate
- Replies: 1
- Views: 205
Difference between initial reaction rate vs reaction rate
Can someone explain the difference between initial reaction rate and reaction rate?
- Tue Mar 10, 2020 10:34 pm
- Forum: General Rate Laws
- Topic: Difference between unique rate and rate law
- Replies: 3
- Views: 231
Difference between unique rate and rate law
Can someone explain the concept of unique rate and rate law. How are they different?
- Mon Mar 09, 2020 3:45 pm
- Forum: General Rate Laws
- Topic: Finding order reaction using experiments
- Replies: 1
- Views: 177
Finding order reaction using experiments
How do you determine which values to use from the list of experiments when trying to find the order reaction?
- Mon Mar 09, 2020 3:43 pm
- Forum: General Rate Laws
- Topic: overall order
- Replies: 5
- Views: 428
overall order
How do you calculate the overall order?
- Mon Mar 09, 2020 1:52 pm
- Forum: Second Order Reactions
- Topic: second order relation to second order integrated law
- Replies: 5
- Views: 442
second order relation to second order integrated law
how is a second order reaction related to a 2nd order integrated law?
Can someone explain each concept separately and how they are interconnected.
Can someone explain each concept separately and how they are interconnected.
- Mon Mar 09, 2020 1:49 pm
- Forum: First Order Reactions
- Topic: Difference between first and second order
- Replies: 6
- Views: 483
Difference between first and second order
I'm still not understanding this concept. Can someone explain the concept of the difference between a first order reaction and a second order reaction?
- Tue Mar 03, 2020 2:14 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Hw problem 6M.7
- Replies: 1
- Views: 181
Hw problem 6M.7
6M.7 Arrange the following metals in order of increasing strength as reducing agents for species in aqueous solution: (a) Cu, Zn, Cr, Fe; (b) Li, Na, K, Mg; (c) U, V, Ti, Al; (d) Ni, Sn, Au, Ag. how can you determine which has a low reduction potential? In this problem, are there specific values to ...
- Tue Mar 03, 2020 2:09 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6M.5 Part b
- Replies: 2
- Views: 230
6M.5 Part b
Can someone explainhow to do 6M.5 part b. The solution manual just says not spontaneous, but I got a value for a spontaneous reaction.
- Tue Mar 03, 2020 2:07 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Hw Problem 6M.1
- Replies: 1
- Views: 233
Hw Problem 6M.1
6M.1 A student was given a standard Cu(s)/Cu21(aq) half-cell and another half-cell containing an unknown metal M in 1.00 m M(NO3)2(aq) and formed the cell M(s)|M1(aq)|Cu21(aq)|Cu(s). The cell potential was found to be 20.689 V. What is the value of Energy potenial (M21/M)? In this problem, why are w...
- Thu Feb 27, 2020 12:24 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Hw problem 6l.3e
- Replies: 1
- Views: 132
Hw problem 6l.3e
In a galvanic cell, how do you determine what is the reactant/product in an equation for anode/cathode ?
(e) Pt(s)|Sn41(aq),Sn2(aq)||Cl-(aq)|Hg2Cl2(s)|Hg(l)
(e) Pt(s)|Sn41(aq),Sn2(aq)||Cl-(aq)|Hg2Cl2(s)|Hg(l)
- Wed Feb 26, 2020 11:57 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Hw problem 6L.3b
- Replies: 1
- Views: 180
Hw problem 6L.3b
(b) C(gr) |H2(g)|H+(aq)||7Cl2(aq)|Cl2(g
In this problem why is Cl2 the reactant in the reduction rxn?
In this problem why is Cl2 the reactant in the reduction rxn?
- Wed Feb 26, 2020 10:53 pm
- Forum: Balancing Redox Reactions
- Topic: Coefficient consideration
- Replies: 4
- Views: 300
Coefficient consideration
Do you you have to consider the coefficient when determining the overall charge of the molecule?
- Wed Feb 26, 2020 10:50 pm
- Forum: Balancing Redox Reactions
- Topic: Water in redox equation
- Replies: 1
- Views: 169
Water in redox equation
In class they told us to not consider water as an active part in the reaction, so in this question would we consider water?
(d) Reaction of chlorine in water: Cl2(g) =HClO(aq) + Cl2(g)
(d) Reaction of chlorine in water: Cl2(g) =HClO(aq) + Cl2(g)
- Wed Feb 26, 2020 10:49 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation or Reduction
- Replies: 2
- Views: 201
Oxidation or Reduction
is 3I- to I3- a oxidation or reduction ? Can you explain why as well.
- Wed Feb 26, 2020 10:47 pm
- Forum: Balancing Redox Reactions
- Topic: How to tell if its being reduced or oxidized
- Replies: 15
- Views: 1814
How to tell if its being reduced or oxidized
i get confused on how to figure out which one is being reduced and oxidized in redox rxns. Does anyone know how I can tell the difference for example MnO4^- to Mn^2+. Since it is going from a negative to positive charge in the end wouldn't it mean that it is being oxidized?
- Wed Feb 26, 2020 10:46 pm
- Forum: Balancing Redox Reactions
- Topic: OH- in Basic Solutions
- Replies: 6
- Views: 414
OH- in Basic Solutions
After what step do you have to add in OH- to balance your redox equation? Is it after you add H20 or after adding your protons?
- Wed Feb 26, 2020 10:43 pm
- Forum: Balancing Redox Reactions
- Topic: Oxygen's oxidation #
- Replies: 6
- Views: 412
Oxygen's oxidation #
why does the element oxygen have a -2 charge but oxygen by itself in a molecule has a charge of zero?
- Sun Feb 23, 2020 12:20 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode vs Cathode
- Replies: 6
- Views: 360
Anode vs Cathode
I'm still having trouble understand what an anode and cathode is.
Can someone explain what these two things are and when they are applied in electrochemistry?
Can someone explain what these two things are and when they are applied in electrochemistry?
- Thu Feb 13, 2020 9:05 am
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy total =0 in reversible isothermal system
- Replies: 1
- Views: 189
Entropy total =0 in reversible isothermal system
Can someone explain why the total entropy value is zero in a reversible isothermal system? Similarly why is the entropy value 0 for the surroundings in an irreversible isothermal system?
- Thu Feb 13, 2020 9:01 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isobaric systems
- Replies: 16
- Views: 736
Isobaric systems
Which equations do you tend to use when solving for an isobaric system?
Also which values are equal to zero in an isobaric system?
Also which values are equal to zero in an isobaric system?
- Thu Feb 13, 2020 8:59 am
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isothermal reversible of ideal gas
- Replies: 4
- Views: 339
Isothermal reversible of ideal gas
Can someone tell me what values such as heat, pressure, etc are equals to zero in an ideal gas of an isothermal reversible system?
- Thu Feb 13, 2020 8:56 am
- Forum: Calculating Work of Expansion
- Topic: Positive or negative work
- Replies: 15
- Views: 2071
Re: Positive or negative work
I am confused as well especially when utilizing the equation W=-nRT sometimes the solution is positive work instead of negative. How can I tell if it’s negative or positive even if the equation has a negative sign in it?
- Mon Feb 03, 2020 8:25 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: 4D.9
- Replies: 1
- Views: 106
4D.9
In this problem, I have alread found the kj/mol but where do I bring in the density value so solve for the enthalpy density? 4D.9 The enthalpy of formation of trinitrotoluene (TNT) is 267 kJ?mol21, and the density of TNT is 1.65 g?cm23. In principle, it could be used as a rocket fuel, with the gases...
- Mon Feb 03, 2020 8:19 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Expansion work/ Compression
- Replies: 7
- Views: 336
Expansion work/ Compression
for expansion do you need to include a negative sign when calculating values
what about compression?
what about compression?
- Mon Feb 03, 2020 8:14 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Problem 4D.3
- Replies: 2
- Views: 126
Problem 4D.3
What equation(s) should be utilized to find the internal energy? I have a feeling q=mcdeltat will be used. The reaction of 1.40 g of carbon monoxide with excess water vapor to produce carbon dioxide and hydrogen gases in a bomb calorimeter causes the temperature of the calorimeter assembly to rise f...
- Wed Jan 29, 2020 9:29 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: List of elements that have value of zero
- Replies: 1
- Views: 115
List of elements that have value of zero
Can someone give a general list of common elements/compounds we will be using that have a bond enthalpy value of zero?
- Wed Jan 29, 2020 9:25 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: explain terms
- Replies: 2
- Views: 152
explain terms
I'm having trouble understanding the differences between these:
Can someone explain the concepts of:
1) bond enthalpy
2) standard enthalpy of formation
3) standard reaction enthalpy
Can someone explain the concepts of:
1) bond enthalpy
2) standard enthalpy of formation
3) standard reaction enthalpy
- Wed Jan 29, 2020 9:21 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: State Function
- Replies: 1
- Views: 87
State Function
I'm having trouble understanding the concept of state function? How does it apply to enthalpy?
- Mon Jan 27, 2020 6:28 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Calorimeter
- Replies: 7
- Views: 483
Calorimeter
I don't understand what a calorimeter is. Can someone explain what it is used for and when it should be applied?
- Mon Jan 27, 2020 6:27 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Hess's Law
- Replies: 11
- Views: 322
Hess's Law
can someone explain hess's law? and when it is applied?
- Mon Jan 27, 2020 6:26 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Last Lecture Week 3 Lec 3
- Replies: 1
- Views: 67
Last Lecture Week 3 Lec 3
in the last example given during lecture can someone explain how they got the mass of the solution when calculating enthalpy?
- Mon Jan 27, 2020 6:25 pm
- Forum: Phase Changes & Related Calculations
- Topic: Enthalpy Intensive or Extensive
- Replies: 4
- Views: 2759
Enthalpy Intensive or Extensive
is enthalpy an intensive or extensive property?
- Tue Jan 21, 2020 12:14 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Increase in Pressure
- Replies: 1
- Views: 59
Increase in Pressure
Can someone explain how pressure affects equilibrium?
State whether reactants or products will be favored by an increase in the total pressure (resulting from compression) on each of the following equilibria. If there is no change, explain why that is so.
State whether reactants or products will be favored by an increase in the total pressure (resulting from compression) on each of the following equilibria. If there is no change, explain why that is so.
- Tue Jan 21, 2020 12:11 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Expansion within an equation
- Replies: 1
- Views: 65
Expansion within an equation
how does expansion affect a reaction and because of it which is more favored products or reactants?
- Tue Jan 21, 2020 12:10 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Noble Gases
- Replies: 1
- Views: 84
Noble Gases
Why do noble gases neither affect the reactants or products in an equilibrium equation?
- Tue Jan 21, 2020 12:09 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Difference between K and Kc
- Replies: 1
- Views: 28
Difference between K and Kc
What is the difference between K and Kc? Can they be used interchangeably?
- Tue Jan 21, 2020 12:08 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: help with hw problem
- Replies: 1
- Views: 124
help with hw problem
For the reaction H2(g) 1 I2(g) ∆ 2 HI(g), K 5 160. at 500. K. An analysis of a reaction mixture at 500. K showed that it had the composition PH2 5 0.20 bar, P I2 5 0.10 bar, and PHI 5 0.10 bar. (a) Calculate the reaction quotient. (b) Is the reaction mixture at equilibrium? (c) If not, is there a te...
- Tue Jan 21, 2020 12:04 am
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: help with hw problem
- Replies: 1
- Views: 878
help with hw problem
A reaction vessel of volume 0.500 L at 700. K contains 1.20 mmol SO2(g), 0.50 mmol O2(g), and 0.10 mmol SO3(g). At 700. K, Kc 5 1.7 3 106 for the equilibrium 2 SO2(g) 1 O2(g) ∆ 2 SO3(g). (a) Calculate the reaction quotient Qc. For part a i keep getting the wrong answer can someone show me how to app...
- Sun Jan 19, 2020 2:45 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Writing acid and base equations for test 1?
- Replies: 1
- Views: 126
Writing acid and base equations for test 1?
For test 1, will we have to write the equations for acids and bases to find their pH? Is there a certain trick to tell whether you need to se use H30+ or OH- in your equation? Can someone explain how to think logically to write an equation for a solid/base?
- Thu Jan 16, 2020 10:52 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Acids and Bases on test?
- Replies: 3
- Views: 169
Acids and Bases on test?
What should be covered in terms of acids and bases in preparation for test 1?
- Wed Jan 08, 2020 4:12 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Hw problem 5G.5
- Replies: 1
- Views: 74
Hw problem 5G.5
Can someone explain how to do part b of the proble step by step as well as part c. 5G.5 The following flasks show the dissociation of a diatomic molecule, X2, over time. (a) Which flask represents the point in time at which the reaction has reached equilibrium? (b) What percentage of the X2 molecule...
- Mon Jan 06, 2020 8:39 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Hw Problem 5G2(d)
- Replies: 1
- Views: 79
Hw Problem 5G2(d)
(d) If the Gibbs free energy is greater than the standard Gibbs free energy of reaction, the reaction proceeds forward to equilibrium.
Can someone explain how to solve this problem? Can you also explain what Gibbs free energy is?
Can someone explain how to solve this problem? Can you also explain what Gibbs free energy is?
- Mon Jan 06, 2020 8:37 pm
- Forum: Ideal Gases
- Topic: Dynamic Equilibrium
- Replies: 10
- Views: 344
Dynamic Equilibrium
Can someone explain dynamic equilibrium?
- Mon Jan 06, 2020 8:33 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Heterogeneous Equilibria
- Replies: 2
- Views: 220
Heterogeneous Equilibria
For a heterogeneous equilibrium, what expression is utilized to find the equilibrium constant?
- Mon Jan 06, 2020 8:31 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Hw Problem G2
- Replies: 5
- Views: 341
Hw Problem G2
True or False: the equilibrium concentrations will be the same whether one starts wit pure reactants or pure products.
- Mon Jan 06, 2020 8:27 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium Expression
- Replies: 2
- Views: 134
Equilibrium Expression
Does the equation to find the equilibrium constant only apply to ideal gases or can it be used as well when there are phase changes?
- Thu Dec 05, 2019 5:48 pm
- Forum: Conjugate Acids & Bases
- Topic: Hw problem 6A.7
- Replies: 1
- Views: 75
Hw problem 6A.7
Below are molecular models of two oxoacids. Write the
name of each acid and then draw the model of its conjugate base.
(Red 5 O, white 5 H, green 5 Cl, and blue 5 N.) Does it matter the format your write the molecular formula?
name of each acid and then draw the model of its conjugate base.
(Red 5 O, white 5 H, green 5 Cl, and blue 5 N.) Does it matter the format your write the molecular formula?
- Thu Dec 05, 2019 5:45 pm
- Forum: Bronsted Acids & Bases
- Topic: Difference between bronsted and conjugate
- Replies: 2
- Views: 125
Difference between bronsted and conjugate
Can someone clarify the difference between bronsted acids and bases and conjugate acids and bases?
- Thu Dec 05, 2019 5:41 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis Acid Base & Bronsted Acid And Base
- Replies: 1
- Views: 70
Lewis Acid Base & Bronsted Acid And Base
how is bronsted acids and bases connected to lewis acids and bases? what makes acid a lewis acid and vise versa with a bronsted acid?
- Thu Dec 05, 2019 5:39 pm
- Forum: Lewis Acids & Bases
- Topic: Hw problem 6A.11
- Replies: 1
- Views: 141
Hw problem 6A.11
For problem 6A.11 part A how do they get the product (h30)+ + (co3)^2- ?
- Thu Dec 05, 2019 5:35 pm
- Forum: Lewis Acids & Bases
- Topic: Hw problem 6A.13
- Replies: 1
- Views: 86
Hw problem 6A.13
For problem 6a.13, is there any way to tell whether a molecule is an acid or base?
- Sun Dec 01, 2019 3:36 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Characteristics of a polydentate ligand
- Replies: 3
- Views: 128
Characteristics of a polydentate ligand
How can you tell if a ligand is polydentate?
- Sun Dec 01, 2019 3:32 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: meaning of edta and en
- Replies: 1
- Views: 162
meaning of edta and en
what does edta and en represent in a coordination compound
- Sun Dec 01, 2019 3:30 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: hw problem
- Replies: 1
- Views: 61
hw problem
With the help of Table 9C.1, determine the coordination
number of the metal ion in each of the following complexes:
1; (c) [PtCl2(en)2]2+
21; (d) [Cr(edta)]-
can soomeone explain step by step how to do this problem.
number of the metal ion in each of the following complexes:
1; (c) [PtCl2(en)2]2+
21; (d) [Cr(edta)]-
can soomeone explain step by step how to do this problem.
- Sun Dec 01, 2019 3:27 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Finding coordination number
- Replies: 1
- Views: 139
Finding coordination number
can someone explain step by step how to find coordination number of sodium dichloridobis(oxalato)platinate(IV).
- Sun Dec 01, 2019 3:24 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Hw 9C1. PART C
- Replies: 1
- Views: 136
Hw 9C1. PART C
Name each of the following complex ions and identify the
oxidation number of the metal: (c) [Co(CN)5(OH2)]^2-
oxidation number of the metal: (c) [Co(CN)5(OH2)]^2-
- Sun Dec 01, 2019 3:20 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Hw problem 9C1.A
- Replies: 2
- Views: 172
Hw problem 9C1.A
Name each of the following complex ions and identify the
oxidation number of the metal: (a) [Fe(CN)6]
oxidation number of the metal: (a) [Fe(CN)6]
- Sun Dec 01, 2019 3:15 pm
- Forum: Naming
- Topic: explain Coordination compound
- Replies: 5
- Views: 369
explain Coordination compound
Can someone explain conceptually what coordination compounds are
- Sun Nov 24, 2019 8:03 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs in Cation/ Anion
- Replies: 2
- Views: 191
Lone Pairs in Cation/ Anion
how do lone pairs around a central atom affect the bond angles in a cation/anion?
- Sun Nov 24, 2019 8:02 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs on Cenrtral Atom
- Replies: 11
- Views: 573
Lone Pairs on Cenrtral Atom
how do lone pairs around a central atom affect the bond angles in a molecule?
- Sun Nov 24, 2019 8:01 pm
- Forum: Resonance Structures
- Topic: Lone Pairs
- Replies: 3
- Views: 318
Lone Pairs
why are lone pairs more likely to be found in certain locations around a central atom?
- Sun Nov 24, 2019 8:00 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: Hw Problem (boiling point)
- Replies: 1
- Views: 118
Hw Problem (boiling point)
Can someone explain how to find which has highest to lowest boiling point: H2S, H2O, KCl, KI
- Sun Nov 24, 2019 7:57 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: Molecule BH2 polar or nonpolar
- Replies: 2
- Views: 532
Molecule BH2 polar or nonpolar
I though BH2 would be polar, but apparently it is nonpolar. Can someone explain why BH2 is nonpolar?
- Sun Nov 24, 2019 7:56 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Explain VSEPR conceptually
- Replies: 12
- Views: 746
Explain VSEPR conceptually
Can someone explain what VSEPR does or what information it tells us?
- Thu Nov 14, 2019 8:46 pm
- Forum: Bond Lengths & Energies
- Topic: Explain what ion-ion, ion-dipole, etc.
- Replies: 2
- Views: 329
Explain what ion-ion, ion-dipole, etc.
Can someone explain what are ion-ion, ion-dipole, dipole-dipole, dipole-induced dipole, and induced-induced dipole is?
- Thu Nov 14, 2019 8:43 pm
- Forum: Dipole Moments
- Topic: Dipole Moment to figure out polarity
- Replies: 3
- Views: 267
Dipole Moment to figure out polarity
Can someone explain how to use dipole moments to figure out if a molecule is polar or not?
- Thu Nov 14, 2019 8:40 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: hw problem 2D.11
- Replies: 2
- Views: 288
hw problem 2D.11
Can someone explain how to solve this?
Arrange the anions Cl 2 , Br 2 , N 32 , and O 22 in order of
increasing polarizability and give reasons for your decisions.
Arrange the anions Cl 2 , Br 2 , N 32 , and O 22 in order of
increasing polarizability and give reasons for your decisions.
- Thu Nov 14, 2019 8:38 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing power vs polarizability
- Replies: 5
- Views: 1017
Polarizing power vs polarizability
What is the difference between polarizing power and polarizability?
- Thu Nov 14, 2019 8:38 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizability
- Replies: 5
- Views: 444
Polarizability
How do you determine if a compound is polar or not?
- Thu Nov 07, 2019 10:09 pm
- Forum: Dipole Moments
- Topic: Discussion Worksheet
- Replies: 1
- Views: 101
Discussion Worksheet
I need help solving this problem. Please explain step by step.
Arrange the anions Cl^-, Br^-, N^3-, O^2- in order of increasing polarizability ad give reasons for your decisions.
Arrange the anions Cl^-, Br^-, N^3-, O^2- in order of increasing polarizability ad give reasons for your decisions.
- Thu Nov 07, 2019 10:05 pm
- Forum: Dipole Moments
- Topic: Explain concept
- Replies: 4
- Views: 127
Explain concept
I'm still not understanding the concept of dipole moment too well. Can someone explain how this applies in lewis structures?
- Thu Nov 07, 2019 10:02 pm
- Forum: Lewis Structures
- Topic: Formal Charges
- Replies: 15
- Views: 880
Formal Charges
Is it better for the central atom to have a +/- charge or have the other atoms take the +/- charge? And if so, why?
- Thu Nov 07, 2019 10:00 pm
- Forum: Lewis Structures
- Topic: Exceptions to Octet Rule
- Replies: 7
- Views: 379
Exceptions to Octet Rule
Is it true that elements located in period 3 specifically elements Al-Ar are an exception to the octet rule? And if so why?
- Thu Nov 07, 2019 9:58 pm
- Forum: Lewis Structures
- Topic: Drawing Lewis Structures
- Replies: 18
- Views: 587
Drawing Lewis Structures
When drawing regular lewis structures do you always have to draw them where their formal charges are zero?
- Wed Oct 30, 2019 1:17 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Hw problem 2A.15
- Replies: 1
- Views: 132
Hw problem 2A.15
How do you solve this ? Is there a certain rule you have to follow?
2A.15 Write the most likely charge for the ions formed by each of
the following elements: (a) S; (b) Te; (c) Rb; (d) Ga; (e) Cd.
2A.15 Write the most likely charge for the ions formed by each of
the following elements: (a) S; (b) Te; (c) Rb; (d) Ga; (e) Cd.
- Wed Oct 30, 2019 1:13 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Hw problem 2A.13
- Replies: 4
- Views: 155
Hw problem 2A.13
Can someone show step by step how to do this problem?
2A.13 For each of the following ground-state atoms, predict the
type of orbital (1s, 2p, 3d, 4f, etc.) from which an electron will need
to be removed to form the 1 1 ions: (a) Zn; (b) Cl; (c) Al; (d) Cu
2A.13 For each of the following ground-state atoms, predict the
type of orbital (1s, 2p, 3d, 4f, etc.) from which an electron will need
to be removed to form the 1 1 ions: (a) Zn; (b) Cl; (c) Al; (d) Cu
- Wed Oct 30, 2019 1:10 am
- Forum: Lewis Structures
- Topic: Resonance
- Replies: 4
- Views: 90
Resonance
Can someone clear up what resonance is because what I'm grasping from this topic is that its an electron that can be in different arrangements.
- Wed Oct 30, 2019 1:04 am
- Forum: Lewis Structures
- Topic: Formal charge
- Replies: 9
- Views: 222
Re: Formal charge
While trying to find the formal charge, how do you find the shared electrons?
- Wed Oct 30, 2019 1:01 am
- Forum: Lewis Structures
- Topic: Formal charge
- Replies: 9
- Views: 222
Re: Formal charge
Can someone explain how to find the lone pair electrons when trying to find the formal charge?
- Wed Oct 23, 2019 3:51 pm
- Forum: Octet Exceptions
- Topic: Octet Rule
- Replies: 6
- Views: 227
Octet Rule
If the element is past the second period in the periodic table does it still need to follow the octet rule?
- Wed Oct 23, 2019 3:48 pm
- Forum: Lewis Structures
- Topic: Finding Valence Electrons
- Replies: 8
- Views: 377
Finding Valence Electrons
How do you determine how many valence electrons an element has using the periodic table?
- Wed Oct 23, 2019 3:43 pm
- Forum: Lewis Structures
- Topic: Electronegativity
- Replies: 5
- Views: 216
Electronegativity
How do you determine which element is less electronegative in a compound element?
- Wed Oct 23, 2019 3:40 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Spin
- Replies: 8
- Views: 450
Re: Electron Spin
Does Hund's rule apply to the Pauli Exclusion Principle?
- Wed Oct 23, 2019 3:37 pm
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy
- Replies: 8
- Views: 262
Re: Ionization Energy
Does the ionization energy increase/decrease down a group in the periodic table?
- Fri Oct 18, 2019 7:49 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: quantum number n, l, m
- Replies: 13
- Views: 383
spin state
How do you know if an electron will spin up or spin down? It depends on the values for n,l,m, right?
- Fri Oct 18, 2019 7:45 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: quantum number n, l, m
- Replies: 13
- Views: 383
Re: quantum number n, l, m
Do n,l, m always follow a certain patter or does it vary?
ex: n=1, l=0, m=0 < will it always follow this pattern?
ex: n=1, l=0, m=0 < will it always follow this pattern?
- Fri Oct 18, 2019 7:42 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: quantum number n, l, m
- Replies: 13
- Views: 383
Describe subshell
Can someone explain what subshells are and how they relate to the orbital?
- Fri Oct 18, 2019 7:36 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 6932
Valence Electrons [ENDORSED]
How do you determine which are the valence electrons after you write out your electron configuration?
- Tue Oct 15, 2019 11:38 pm
- Forum: Properties of Light
- Topic: Homework help
- Replies: 4
- Views: 121
Re: Homework help
For this problem, do I need to find the mole of sodium?
1B.7 Sodium vapor lamps, used for public lighting, emit yellow
light of wavelength 589 nm. How much energy is emitted by (a) an
excited sodium atom when it generates a photon;
1B.7 Sodium vapor lamps, used for public lighting, emit yellow
light of wavelength 589 nm. How much energy is emitted by (a) an
excited sodium atom when it generates a photon;
- Tue Oct 15, 2019 11:13 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 6932
Re: Week 3 Homework Problems [ENDORSED]
For part a what equation can be used to solve for wavelength? The velocity of an electron that is emitted from a metallic surface by a photon is 3.6x10^3 kms (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radi...
- Wed Oct 09, 2019 6:55 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 6932
Re: Week 2 Homework Problems [ENDORSED]
1A.9 A college student recently had a busy day. Each of the student’s activities on that day (reading, getting a dental x-ray, making popcorn in a microwave oven, and acquiring a suntan) involved radiation from a different part of the electromagnetic spectrum. Complete the following table and match ...
- Wed Oct 09, 2019 6:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 6932
Re: Week 2 Homework Problems [ENDORSED]
Does anyone know the energy of microwaves?
Arrange the following types of photons of electromagnetic
radiation in order of increasing energy: g -rays, visible light, ultraviolet radiation, microwaves, x-rays.
Arrange the following types of photons of electromagnetic
radiation in order of increasing energy: g -rays, visible light, ultraviolet radiation, microwaves, x-rays.
- Wed Oct 09, 2019 6:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 6932
Re: Week 2 Homework Problems [ENDORSED]
What conversion would we use to turn the value into picometers? 1A.7 (a) The frequency of violet light is 7.1 3 10 14 Hz. What is the wavelength (in nanometers) of violet light? (b) When an electron beam strikes a block of copper, x-rays with a frequency of 2.0 3 10 18 Hz are emitted. What is the wa...
- Wed Oct 09, 2019 6:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 6932
Re: Week 2 Homework Problems [ENDORSED]
What equation should be utilized for this problem?
1A.15 In the ultraviolet spectrum of atomic hydrogen, a line is
observed at 102.6 nm. Determine the values of n for the initial and
final energy levels of the electron during the emission of energy
that leads to this spectral line.
1A.15 In the ultraviolet spectrum of atomic hydrogen, a line is
observed at 102.6 nm. Determine the values of n for the initial and
final energy levels of the electron during the emission of energy
that leads to this spectral line.
- Wed Oct 09, 2019 6:40 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Week 2 Homework Problems [ENDORSED]
- Replies: 67
- Views: 6932
Re: Week 2 Homework Problems [ENDORSED]
Can someone clarify the answer? Which of the following statements about the electromagnetic spectrum is true? Explain your reasoning. (a) X-rays travel faster than infrared radiation because they have higher energy. (b) The wavelength of visible radiation decreases as its color changes from blue to ...
- Tue Oct 01, 2019 10:04 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Formula Units
- Replies: 3
- Views: 243
Re: Problem E. 25
A) to turn moles into formula units/atoms i used the equation from the textbook Number of object=amount in moles x avagadro's constant so you multiply 0.750 mol KNO3 x (6.022x10^23) and get 4.52x10^23 formula units. B) They're asking us for the mass so we will need to find the moles. With the formul...