Search found 99 matches
- Mon Mar 11, 2019 8:45 am
- Forum: Administrative Questions and Class Announcements
- Topic: Homework week 9
- Replies: 3
- Views: 465
Re: Homework week 9
No I believe we just turn in 7 problems this week.
- Mon Mar 11, 2019 8:37 am
- Forum: Zero Order Reactions
- Topic: Graphs
- Replies: 6
- Views: 846
Graphs
Do we need to know what the graphs will look like for zero, first, and second order reactions?
- Mon Mar 11, 2019 8:34 am
- Forum: Second Order Reactions
- Topic: Second Order Reaction Graphs
- Replies: 1
- Views: 331
Second Order Reaction Graphs
Will the graph of a second order reaction always be a straight line with a negative slope?
- Mon Mar 11, 2019 8:32 am
- Forum: Zero Order Reactions
- Topic: Zero Order Units
- Replies: 3
- Views: 421
Re: Zero Order Units
In the 7th edition, 7a problem #7 lays it out. The units for zero order are (mol A)/L/s. The units for first order are s^-1. The units for second order are L/(mol A)/s.
- Mon Mar 04, 2019 12:29 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Activation energy
- Replies: 8
- Views: 812
Re: Activation energy
Activation energy is the energy needed for the reaction to occur. It is also known as Ea. The less activation energy needed the more favorable the process/reaction is.
- Mon Mar 04, 2019 12:26 pm
- Forum: General Rate Laws
- Topic: Derivatives
- Replies: 5
- Views: 550
Derivatives
In lecture today, many equations involved integrals and derivatives. Do we need to know how to solve with integrals and derivatives for the kinetics section?
- Mon Mar 04, 2019 12:24 pm
- Forum: First Order Reactions
- Topic: First Order Reactions
- Replies: 6
- Views: 573
First Order Reactions
In first order reactions, will it always be a straight line like the graph in lecture from today?
- Mon Mar 04, 2019 12:23 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Pt
- Replies: 14
- Views: 1243
Re: Pt
You add Pt(s) when there is not a solid on either the anode or cathode side. Sometimes it will tell you what kind of solid to add in the problem.
- Mon Mar 04, 2019 12:20 pm
- Forum: Balancing Redox Reactions
- Topic: Cell diagrams
- Replies: 8
- Views: 772
Re: Cell diagrams
If the anode or cathode does not include a solid, you add Pt(s) to whatever side does not have a solid. The aqueous solutions always go near the line (I). For example Pt(s) I Na (aq) II cathode.
- Mon Feb 25, 2019 4:20 pm
- Forum: Balancing Redox Reactions
- Topic: Friday Lecture Example [ENDORSED]
- Replies: 2
- Views: 332
Friday Lecture Example [ENDORSED]
In Friday's lecture, the answer to his example was Cu(s) I Cu^2+(aq) II Fe^3+ (aq), Fe^2+(aq) II Pt(s). Why is the Pt(s) added?
- Mon Feb 25, 2019 2:25 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: F in Nernst Equation
- Replies: 2
- Views: 231
F in Nernst Equation
Is F in the Nernst Equation a constant?
- Mon Feb 25, 2019 2:22 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Order in Cell Diagrams
- Replies: 2
- Views: 285
Re: Order in Cell Diagrams
Oxidation (from reactants), oxidation (from products) II reduction (from reactants), reduction (from products).
Separate with comma for same states
Sperate with I when different states
Separate with comma for same states
Sperate with I when different states
- Mon Feb 25, 2019 2:18 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Voltage
- Replies: 1
- Views: 207
Voltage
Is voltage always positive?
- Mon Feb 25, 2019 2:09 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams
- Replies: 2
- Views: 285
Re: Cell Diagrams
Cu(s) and Cu2+(aq) is separated by a I because it is two different states. Fe3+(aq) and Fe2+(aq) is separated by a comma because they are the same state.
- Mon Feb 18, 2019 5:48 pm
- Forum: Van't Hoff Equation
- Topic: Van't Hoff Equation
- Replies: 4
- Views: 429
Van't Hoff Equation
In the Van't Hoff equation, is the 2 R's in the equation both Boltemann's constant?
- Mon Feb 18, 2019 5:46 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Delta G
- Replies: 4
- Views: 445
Re: Delta G
The çhange in G is not dependent on path taken so it would not be a state function.
- Mon Feb 18, 2019 5:45 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs Free Energy
- Replies: 4
- Views: 418
Gibbs Free Energy
G=-RTlnK, in this equation does K represent the confrontation of products over reactants?
- Mon Feb 18, 2019 5:43 pm
- Forum: Van't Hoff Equation
- Topic: vant hoff
- Replies: 2
- Views: 437
Re: vant hoff
You need a constant pressure. The Van't Hoff equation can be used to calculate K @ different temperature if delta H is known.
- Mon Feb 18, 2019 5:40 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy
- Replies: 3
- Views: 426
Re: Entropy
Gases have the highest entropy value because the molecules have the greatest freedom of movement. Entropy of solid<Entropy of liquid<entropy of gas
- Mon Feb 11, 2019 10:35 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Delta H
- Replies: 3
- Views: 444
Delta H
When does delta H replace q in delta u=q+w?
- Mon Feb 11, 2019 10:34 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible Expansion
- Replies: 2
- Views: 317
Re: Reversible Expansion
R (constant) is in Kelvin, so it would be more efficient to use K.
- Mon Feb 11, 2019 10:33 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible Expansion
- Replies: 2
- Views: 317
Re: Reversible Expansion
R (constant) is in Kelvin, so it would be more efficient to use K.
- Mon Feb 11, 2019 10:30 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Microstates
- Replies: 7
- Views: 1023
Re: Microstates
micro states to the power of molecules are W in the equation s=kblnW
- Mon Feb 11, 2019 2:44 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Signs for entropy
- Replies: 5
- Views: 476
Signs for entropy
When do you use -delta H/T versus +delta H/T?
- Mon Feb 04, 2019 9:51 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Open vs Closed Systems
- Replies: 4
- Views: 489
Open vs Closed Systems
I get confused on identifying open vs closed systems. Can someone give me examples of each and how they go about differentiation one vs the other?
- Mon Feb 04, 2019 9:49 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpy
- Replies: 2
- Views: 307
Bond Enthalpy
Will the Lewis Structure be given for a problem with bond enthalpy on a test?
- Mon Feb 04, 2019 9:46 am
- Forum: Phase Changes & Related Calculations
- Topic: Heat and Condensation
- Replies: 9
- Views: 893
Re: Heat and Condensation
Condensation releases heat because you are going from a gas to liquid state. In a gas molecules are moving rapidly, so in order to slow the particles you need to release heat to turn them into a liquid.
- Mon Feb 04, 2019 9:43 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Work
- Replies: 6
- Views: 627
Re: Work
I think of work like exothermic and endothermic. Doing work on a system is positive because you are adding energy. Work by a system is negative because energy is released.
- Mon Jan 28, 2019 10:00 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Bond Enthalpies
- Replies: 2
- Views: 221
Bond Enthalpies
In lecture on Friday, Dr. Lavelle said bond enthalpies of diatomic molecules are accurate, but all others are averages of many different molecules. Can someone give me an example of what he means?
- Mon Jan 28, 2019 9:56 am
- Forum: Phase Changes & Related Calculations
- Topic: Enthalpy and state property
- Replies: 2
- Views: 277
Enthalpy and state property
Can someone explain how enthalpy is a state property?
- Mon Jan 28, 2019 9:55 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Exothermic vs. Endothermic
- Replies: 10
- Views: 3138
Re: Exothermic vs. Endothermic
Endothermic has a positive delta G and exothermic has a negative delta g. Endothermic requires heat and exothermic releases heat. Endothermic favors product formation and exothermic favors reactant formation.
- Mon Jan 28, 2019 9:50 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Units of Kp
- Replies: 9
- Views: 3599
Re: Units of Kp
Kp is usually atm or bar, but make sure you use the same units for all the gases in the problem.
- Mon Jan 21, 2019 9:31 am
- Forum: Ideal Gases
- Topic: ICE table
- Replies: 11
- Views: 1256
Re: ICE table
You can use it for both, but be careful when coming up with your final answer. Use Kp instead of Kw.
- Mon Jan 21, 2019 9:26 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Calculating pH of a weak acid and its salt
- Replies: 4
- Views: 653
Calculating pH of a weak acid and its salt
For calculating the pH of a weak acid and its salt, is an extra number given, but the steps to complete the problem are the same?
- Mon Jan 21, 2019 9:25 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Temperature for Equilibrium
- Replies: 4
- Views: 288
Temperature for Equilibrium
Is 25 degrees C the standard temperature for equilibrium?
- Mon Jan 21, 2019 9:24 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 4
- Views: 410
Le Chatelier's Principle
Can someone explain Le Chatelier's Principle?
- Mon Jan 14, 2019 9:36 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Example from lecture on Wednesday
- Replies: 2
- Views: 184
Example from lecture on Wednesday
On Wednesday in lecture, Dr. Lavalle went over an example about ATP Hydrolysis with ATP + h20 as the reactants going to ADP + Pi. Can someone explain the ice table values, such as how he got them and the answer?
- Mon Jan 14, 2019 9:32 am
- Forum: Ideal Gases
- Topic: Denoting brackets/parentheses
- Replies: 9
- Views: 2104
Re: Denoting brackets/parentheses
Brackets are only used when dealing with concentration.
- Mon Jan 14, 2019 9:30 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Temperature
- Replies: 6
- Views: 503
Re: Temperature
If the temperature is increased, molecules increase their speed and movement. If temperature decreases, molecules decrease their speed and movement.
- Mon Jan 14, 2019 9:26 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Changing Temperature
- Replies: 4
- Views: 405
Re: Changing Temperature
When the heat is lowered, you are giving off heat, so it would be an exothermic reaction (shifting towards the formation of products).
- Tue Jan 08, 2019 7:20 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Problem #1 5J 7th Edition
- Replies: 1
- Views: 147
Problem #1 5J 7th Edition
Can someone explain to me how to use the Le Chatelier's principle to figure out this problem?
- Tue Jan 08, 2019 7:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K'
- Replies: 3
- Views: 262
Re: K'
K' refers to the reverse reaction. You can find K' by calculating 1/K.
- Tue Jan 08, 2019 7:02 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc vs. Kp
- Replies: 7
- Views: 625
Re: Kc vs. Kp
Kp is only used when dealing with gases.
- Tue Jan 08, 2019 7:01 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5H Problem #3 7th Edition
- Replies: 2
- Views: 169
5H Problem #3 7th Edition
When combining the two equations, why is Cl^2 not included in the final equation?
- Mon Dec 03, 2018 4:32 pm
- Forum: Naming
- Topic: nitro vs nitrito
- Replies: 3
- Views: 634
Re: nitro vs nitrito
In the 7th edition book Table 9C.1 shows the difference. The N is underlined in nitro and the O is underlined in nitrito
- Mon Dec 03, 2018 4:29 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate
- Replies: 1
- Views: 209
Polydentate
To figure out if a compound is polydentate, do we have to draw the lewis structure and count the number of lone pairs or is there an easier way to go about doing this?
- Mon Dec 03, 2018 4:27 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Number
- Replies: 2
- Views: 296
Coordination Number
To find the coordination number, do we have to draw the Lewis structure and count the number of bonds? Or is there an easier way than drawing the lewis structure?
- Mon Dec 03, 2018 4:25 pm
- Forum: Lewis Acids & Bases
- Topic: 6C #19 7th Edition
- Replies: 1
- Views: 207
6C #19 7th Edition
In 6C #19 7th Edition, how can we conclude that HClO2 is a stronger acid than HClO?
- Mon Nov 26, 2018 1:43 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: Polar vs Non-polar
- Replies: 2
- Views: 269
Polar vs Non-polar
How can you tell if an atom is polar or non-polar?
- Mon Nov 26, 2018 1:25 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizability
- Replies: 4
- Views: 732
Re: Polarizability
For polarizability, would the trend decrease across a period from right to left because the atoms are getting smaller from right to left?
- Mon Nov 26, 2018 1:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarizability
- Replies: 3
- Views: 134
Re: Polarizability
Is there a trend for polarizability?
- Mon Nov 26, 2018 1:16 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation Number
- Replies: 4
- Views: 347
Re: Oxidation Number
How do we know [Fe(CN)6] has an overall charge of -4? Is it given?
- Mon Nov 26, 2018 1:11 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarizability
- Replies: 3
- Views: 134
Polarizability
Can someone explain to me how to determine which atom has a higher polarizability?
- Mon Nov 19, 2018 2:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma and Pi Bonds
- Replies: 3
- Views: 114
Sigma and Pi Bonds
Do we need to know how to draw sigma and pi bonds?
- Mon Nov 19, 2018 2:54 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: Polar Molecules
- Replies: 2
- Views: 296
Polar Molecules
Is there an easy way to figure out if a molecule is polar?
- Mon Nov 19, 2018 2:51 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 3
- Views: 120
Re: Bond Angles
<180 or <90
- Mon Nov 19, 2018 2:49 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pairs and bonding
- Replies: 4
- Views: 404
Lone pairs and bonding
Can someone explain why larger lone pairs electrons force bonding electrons closer together?
- Mon Nov 19, 2018 2:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular geometry vs Electronicgeometry
- Replies: 3
- Views: 432
Molecular geometry vs Electronicgeometry
What is the difference between molecular geometry vs electronicgeometry?
- Mon Nov 12, 2018 1:57 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizing Power
- Replies: 5
- Views: 487
Polarizing Power
Can someone explain to me how we determine polarizing power?
- Mon Nov 12, 2018 1:29 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 12
- Views: 1211
Re: Formal Charge
A resonance is a Lewis structure that have bonds in different equivalent locations.
- Mon Nov 12, 2018 1:27 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Cations and polarizing power
- Replies: 3
- Views: 257
Cations and polarizing power
Can someone explain to me why smaller and more highly charged cations have more polarizing power?
- Mon Nov 12, 2018 1:27 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Cations and polarizing power
- Replies: 2
- Views: 303
Cations and polarizing power
Can someone explain to me why smaller and more highly charged cations have more polarizing power?
- Mon Nov 12, 2018 1:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 4
- Views: 445
Bond Angles
When determining bond angles, will a linear structure always have 180 degrees? Will a trigonal planar structure always have 120 degrees? Will a tetrahedral structure always have 109.5 degrees?
- Mon Nov 12, 2018 1:18 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Energy of Bonds
- Replies: 3
- Views: 352
Re: Energy of Bonds
The energy is given and my TA said there is a sheet that tells you the energy of bonds.
- Tue Nov 06, 2018 12:45 am
- Forum: Bond Lengths & Energies
- Topic: Bond Lengths
- Replies: 6
- Views: 543
Bond Lengths
Can someone explain to me the process for determining bond lengths?
- Tue Nov 06, 2018 12:44 am
- Forum: Octet Exceptions
- Topic: Octet rule vs. Formal charge
- Replies: 7
- Views: 1012
Re: Octet rule vs. Formal charge
All elements must have an octet, but you look at formal charge to find the most stable Lewis structure.
- Tue Nov 06, 2018 12:43 am
- Forum: Octet Exceptions
- Topic: Octet Exceptions
- Replies: 4
- Views: 372
Re: Octet Exceptions
H, He, Li, and Be do not obtain a full octet. Elements in period 3 or below can have an expanded octet, including S, P, and Cl.
- Sun Nov 04, 2018 9:49 pm
- Forum: DeBroglie Equation
- Topic: Kg vs Grams
- Replies: 6
- Views: 651
Re: Kg vs Grams
Kg is the SI unit. We only use grams when working with moles. Always convert to kg.
- Sun Nov 04, 2018 5:54 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 4
- Views: 421
Electronegativity
Does electronegativity have the same trend as electron affinity on the periodic table?
- Sun Nov 04, 2018 5:51 pm
- Forum: Properties of Light
- Topic: Standard Units
- Replies: 8
- Views: 758
Re: Standard Units
Wavelength units are m or nm. If they give you nm, make sure to convert to m (SI unit for wavelength)
- Sun Nov 04, 2018 5:43 pm
- Forum: Lewis Structures
- Topic: central atom
- Replies: 7
- Views: 541
Re: central atom
The central atom is most likely the atom with the lowest ionization energy
- Sun Nov 04, 2018 5:39 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius
- Replies: 4
- Views: 401
Re: Atomic Radius
Electrons are equal to the number of protons. If an element has more protons, then it will have more electrons, causing the element to have more shells and be bigger.
- Sun Nov 04, 2018 5:37 pm
- Forum: Electronegativity
- Topic: Problem 2D #11 (7th edition)
- Replies: 2
- Views: 311
Problem 2D #11 (7th edition)
On Problem 2D #11 (7th edition), can someone explain to me how O2- is smaller than N3- for polarizability?
- Sun Nov 04, 2018 1:19 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Problem 1A #15 (7th edition book)
- Replies: 1
- Views: 408
Problem 1A #15 (7th edition book)
On Problem 1A #15 (7th edition book), I understand all the steps to get 0.112, but I am confused on how n2^2 is 9 and then you take the square root and the answer for n2 is 3. Can someone explain this to me?
- Mon Oct 29, 2018 4:40 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Lengths
- Replies: 3
- Views: 355
Bond Lengths
On today's lecture notes, there was bond lengths labeled on certain bonds. For example, in the benzene example the double bonds had 1.34A and the single bonds had 1.54A. I am confused on how we figure out these numbers.
- Mon Oct 29, 2018 4:33 pm
- Forum: Lewis Structures
- Topic: lewis structure
- Replies: 10
- Views: 1011
Re: lewis structure
The central atom is the atom in the middle. It is determined by the atom with the lowest ionization energy. Ionization energy increases up a group and increases across a period.
- Mon Oct 29, 2018 4:31 pm
- Forum: Lewis Structures
- Topic: central atom
- Replies: 7
- Views: 541
Re: central atom
The central atom is the atom with the least ionization energy. Hydrogen is never a central atom. Ionization energy increases up a group and increases across a period making Flourine (F) have the largest ionization energy.
- Mon Oct 29, 2018 4:28 pm
- Forum: Einstein Equation
- Topic: E=hv [ENDORSED]
- Replies: 52
- Views: 18043
Re: E=hv [ENDORSED]
The E would represent the energy of the photon. The work function or threshold energy would be the energy required to remove an electron.
- Mon Oct 22, 2018 9:26 am
- Forum: Properties of Light
- Topic: kg or g [ENDORSED]
- Replies: 11
- Views: 1608
Re: kg or g [ENDORSED]
kg is the SI unit. Grams is only used for moles. Also Joules is kg m^2 s^-2, so it would make sense to use kg.
- Mon Oct 22, 2018 9:20 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 7th Edition Book, Section 1.D #23
- Replies: 2
- Views: 139
7th Edition Book, Section 1.D #23
In the 7th Edition Book, Section 1.D #23, it asks how many orbitals can have the following quantum numbers in an atom? I understand how to get a, b, and d, but I an confused on c) n=2. Can someone explain to me how the answer is 4?
- Mon Oct 22, 2018 9:17 am
- Forum: Einstein Equation
- Topic: 7th Edition Book, Section 1.A #9
- Replies: 2
- Views: 535
7th Edition Book, Section 1.A #9
In the 7th Edition Book, Section 1.A #9 it asks for us to fill out a chart. I understand the first three columns, but don't understand the last column that says "event." How do we know the event based on the answers we found and are given? Is there a chart that tells you the event based on...
- Mon Oct 22, 2018 9:13 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration
- Replies: 5
- Views: 447
Electron Configuration
In the 7th edition book, section 1.E #13 asks to write the ground state electron configuration for a) silver. Is the answer [Kr]4d^105s^1 an okay answer or do we need to draw it out?
- Sun Oct 21, 2018 11:37 am
- Forum: Properties of Light
- Topic: Equations
- Replies: 6
- Views: 593
Equations
Will we be given a sheet with equations for chemistry test #2?
- Mon Oct 15, 2018 2:37 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg's Indeterminacy Equation
- Replies: 2
- Views: 153
Heisenberg's Indeterminacy Equation
Can someone explain to me where 4pi comes from in the heisenberg indeterminacy equation?
- Mon Oct 15, 2018 2:34 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Negative sign in front of Bohr Frequency Condition
- Replies: 4
- Views: 445
Re: Negative sign in front of Bohr Frequency Condition
The negative sign means the bound electron has lower energy than the free electron. The energy is still positive.
- Mon Oct 15, 2018 2:28 pm
- Forum: Properties of Electrons
- Topic: Constructive vs Destructive
- Replies: 3
- Views: 257
Re: Constructive vs Destructive
Constructive is when waves are in phase, meaning the waves are on the same pattern which creates a greater amplitude. Destructive is when waves are out of phase, meaning the waves are opposite of each other, which creates a smaller amplitude. This shows that waves show diffraction patterns and have ...
- Mon Oct 15, 2018 2:24 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Planck's constant
- Replies: 7
- Views: 1419
Re: Planck's constant
Planck's constant is used in the equation E=hv(frequency) and various others. It is equal to 6.626x10^-34 J/s
- Tue Oct 09, 2018 3:17 pm
- Forum: Empirical & Molecular Formulas
- Topic: when to multiply empirical formula [ENDORSED]
- Replies: 9
- Views: 4443
Re: when to multiply empirical formula [ENDORSED]
You want to multiply by the smallest possible number that will give you a whole number. I would multiply 3.5 by 2 to get 7.
- Tue Oct 09, 2018 3:15 pm
- Forum: Properties of Light
- Topic: Wavelength vs Frequency
- Replies: 7
- Views: 580
Re: Wavelength vs Frequency
Wavelength is the distance from one peak to another. Frequency is the amount of waves over a given period.
- Tue Oct 09, 2018 3:10 pm
- Forum: Limiting Reactant Calculations
- Topic: Theoretical vs Actual Yield
- Replies: 5
- Views: 3016
Re: Theoretical vs Actual Yield
The theoretical yield is always bigger because due to side reactions, impurities, etc. the actual yield will be less.
- Tue Oct 09, 2018 3:07 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Finding the volume of stock solution to dilute
- Replies: 13
- Views: 1243
Re: Finding the volume of stock solution to dilute
It does not matter if you use mL or L, but you have to stay consistent throughout the whole problem. I usually just change to liters.
- Sun Oct 07, 2018 2:08 pm
- Forum: Properties of Light
- Topic: Topic 1A #3
- Replies: 2
- Views: 157
Topic 1A #3
I am confused on this problem. To find out all the parts (a,b,c,d) do we only use the equation E=hv or do we need to use another equation also?
- Sun Oct 07, 2018 1:55 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Equations
- Replies: 1
- Views: 153
Re: Photoelectric Equations
The correct answer would be d (E=hv). E = energy h= Planck's constant v= frequency
- Sun Oct 07, 2018 1:50 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molecular Formula
- Replies: 12
- Views: 542
Re: Molecular Formula
The molecular formula tells you how many atoms there are per element, so all you would need to do is count the atoms. You would not be able to do this with the empirical formula though because the empirical formula is a ratio.
- Sun Oct 07, 2018 1:44 pm
- Forum: Properties of Light
- Topic: C=Delta x V
- Replies: 6
- Views: 561
Re: C=Delta x V
The only equation I can think of is c=(lamba)x(v). I don't think c=delta x v exists.
- Tue Oct 02, 2018 2:18 pm
- Forum: Balancing Chemical Reactions
- Topic: States of Atoms
- Replies: 7
- Views: 448
Re: States of Atoms
For the states of atoms, I would just look it up. After doing problems with the states of atoms, it becomes easier because you see it more often.
- Mon Oct 01, 2018 4:20 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant
- Replies: 2
- Views: 984
Limiting Reactant
On the limiting reactant video, the example is calcium carbonate reacts with water to form calcium hydroxide and ethyne. I understand up to calculating the moles of CaC2 and H2O, but am confused why we have to multiply 1.56 (moles of CaC2) by 2. Can someone help me with this?
- Mon Oct 01, 2018 4:10 pm
- Forum: SI Units, Unit Conversions
- Topic: Naming Compounds
- Replies: 8
- Views: 532
Re: Naming Compounds
Sadly there is no trick, the best way is to memorize.
- Mon Oct 01, 2018 3:49 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting reagents
- Replies: 12
- Views: 810
Re: Limiting reagents
The limiting reagent is the reactant that gets used up first in a chemical reaction. It determines how much product is produced. There cannot be two limiting reagents because once one reactant is used up the reaction cannot continue.