Search found 100 matches
- Mon Mar 15, 2021 7:52 pm
- Forum: First Order Reactions
- Topic: Half Life Unit
- Replies: 38
- Views: 1585
Re: Half Life Unit
It will depend on the units that are given to us in the problem.
- Mon Mar 15, 2021 7:50 pm
- Forum: General Rate Laws
- Topic: Intermediate
- Replies: 59
- Views: 3827
Re: Intermediate
An intermediate is a species in a chemical reaction that is created in one step, but then used up in the next.
- Mon Mar 15, 2021 7:49 pm
- Forum: General Rate Laws
- Topic: Factors Affecting k
- Replies: 83
- Views: 5280
Re: Factors Affecting k
If there is a change in temperature, k changes as well.
- Mon Mar 15, 2021 7:48 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts and Intermediates
- Replies: 16
- Views: 900
Re: Catalysts and Intermediates
Intermediates appear as products as first and then are used up as reactants, catalysts show up as reactants and then become products.
- Mon Mar 15, 2021 7:48 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Effect of catalyst
- Replies: 22
- Views: 2415
Re: Effect of catalyst
A catalyst will only affect the pathway taken in a reaction.
- Sun Mar 07, 2021 9:56 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Reaction/Average Rate
- Replies: 13
- Views: 769
Re: Reaction/Average Rate
The average rate of reaction is used to describe the reaction as a whole, while the instantaneous rate is used to describe the reaction at a specific point in time.
- Sun Mar 07, 2021 9:55 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetic control
- Replies: 14
- Views: 926
Re: Kinetic control
Reactions can be kinetically controlled by the rate of formation of the product, which is a kinetic factor.
- Sun Mar 07, 2021 9:53 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: intermediate
- Replies: 26
- Views: 2059
Re: intermediate
Intermediates are formed during the reaction and then used up, so they are not a part of the rate law.
- Sun Mar 07, 2021 9:52 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Instantaneous Rate
- Replies: 41
- Views: 2247
Re: Instantaneous Rate
As time increases the instantaneous rate decreases.
- Sun Mar 07, 2021 9:50 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: kinetics vs. thermodynamics
- Replies: 23
- Views: 1279
Re: kinetics vs. thermodynamics
Kinetics deals with the rate of the reaction while thermodynamics observes the stability of the reaction.
- Sun Mar 07, 2021 9:50 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Diamond vs. Graphite
- Replies: 23
- Views: 1111
Re: Diamond vs. Graphite
Yes, the reaction would just take a very long time.
- Sun Mar 07, 2021 9:49 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: -d[R]/dT versus d[P]/dt
- Replies: 13
- Views: 928
Re: -d[R]/dT versus d[P]/dt
These two would have the same values if the number if moles in the system are the same.
- Sun Mar 07, 2021 9:48 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Activation Energy
- Replies: 17
- Views: 983
Re: Activation Energy
The two are not interchangeable as they do not represent the same thing.
- Sun Mar 07, 2021 9:47 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Units for reaction rates
- Replies: 15
- Views: 1127
Re: Units for reaction rates
The units are:
zero order= molL−1s−1
first order= s−1
second order= L mol−1s−1
zero order= molL−1s−1
first order= s−1
second order= L mol−1s−1
- Sun Mar 07, 2021 9:47 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: What was your favorite chem topic?
- Replies: 137
- Views: 11079
Re: What was your favorite chem topic?
I enjoyed equilibrium the most.
- Mon Feb 22, 2021 4:20 pm
- Forum: Balancing Redox Reactions
- Topic: salt bridge
- Replies: 19
- Views: 776
Re: salt bridge
The salt bridge helps maintain the concentration of the cell - thus allowing the redox reaction to continue.
- Mon Feb 22, 2021 4:19 pm
- Forum: Balancing Redox Reactions
- Topic: Cell/battery
- Replies: 26
- Views: 985
Re: Cell/battery
Yes, they are essentially the same thing.
- Mon Feb 22, 2021 4:19 pm
- Forum: Balancing Redox Reactions
- Topic: coefficients for oxidation number
- Replies: 22
- Views: 4947
Re: coefficients for oxidation number
The coefficients have no effect on the oxidation number.
- Mon Feb 22, 2021 4:18 pm
- Forum: Balancing Redox Reactions
- Topic: "Leo" Oxidation Numbers
- Replies: 26
- Views: 1139
Re: "Leo" Oxidation Numbers
Losing Electrons = Oxidation, and that is why the number increases, since the charge of the atom is increasing as it loses electrons.
- Mon Feb 22, 2021 4:16 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidizing vs Reducing
- Replies: 55
- Views: 2593
Re: Oxidizing vs Reducing
I like to use the acronym OIL RIG
Oxidation Is Loss of electrons
Reduction Is Gain of electrons
Oxidation Is Loss of electrons
Reduction Is Gain of electrons
- Tue Feb 16, 2021 2:27 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Adding Equations
- Replies: 16
- Views: 815
Re: Adding Equations
Yes that is correct, since the equations for both are state functions.
- Tue Feb 16, 2021 2:26 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy: kJ or J?
- Replies: 30
- Views: 1620
Re: Entropy: kJ or J?
Entropy is in J/K.
- Tue Feb 16, 2021 2:26 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Entropy definition
- Replies: 37
- Views: 2551
Re: Entropy definition
Entropy is the level of disorder in a system and its surroundings, or the universe.
- Tue Feb 16, 2021 2:25 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneity of a System
- Replies: 38
- Views: 2886
Re: Spontaneity of a System
We can use the Gibbs free energy equation to figure out if a system is spontaneous. As long as G is less than 0 the reaction will be spontaneous.
- Tue Feb 16, 2021 2:24 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: G° vs G
- Replies: 30
- Views: 2662
Re: G° vs G
G° is under standard conditions, 298K and 1 atm.
- Tue Feb 16, 2021 2:23 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Likeliness to form products/reactants
- Replies: 27
- Views: 966
Re: Likeliness to form products/reactants
If G < 0 it will form more products and if G is > 0 it will form more reactants.
- Tue Feb 16, 2021 2:22 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: confusion with notation
- Replies: 11
- Views: 560
Re: confusion with notation
d is for derivatives and delta signifies a change in quantity.
- Tue Feb 16, 2021 2:22 pm
- Forum: Calculating Work of Expansion
- Topic: negative vs positive work
- Replies: 21
- Views: 988
Re: negative vs positive work
Yes, this is the correct explanation.
- Tue Feb 16, 2021 2:21 pm
- Forum: Calculating Work of Expansion
- Topic: Work Done on System?
- Replies: 12
- Views: 591
Re: Work Done on System?
In this case work is negative.
- Tue Feb 16, 2021 2:21 pm
- Forum: Calculating Work of Expansion
- Topic: Sign of work
- Replies: 25
- Views: 961
Re: Sign of work
In this context work done on the system is positive and work being done by the system is negative.
- Fri Jan 29, 2021 11:21 pm
- Forum: Phase Changes & Related Calculations
- Topic: Examples of sublimation
- Replies: 12
- Views: 541
Re: Examples of sublimation
Dry ice is a good example since it goes straight from solid dry ice to a vapor.
- Fri Jan 29, 2021 11:19 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase Changes
- Replies: 18
- Views: 600
Re: Phase Changes
A phase change is significant because the temperature of the system is not changing, but heat is being released/absorbed in order to form/break bonds of the reactants. A liquid changing to a gas would require heat.
- Fri Jan 29, 2021 11:17 pm
- Forum: Phase Changes & Related Calculations
- Topic: endothermic/exothermic
- Replies: 43
- Views: 4697
Re: endothermic/exothermic
We can tell if a reaction is endo/exothermic by using the delta H values or by determining the phase change of the reactants.
- Fri Jan 29, 2021 11:16 pm
- Forum: Phase Changes & Related Calculations
- Topic: midterm respondus
- Replies: 19
- Views: 820
Re: midterm respondus
Everything will be set up if you go through the link on CCLE.
- Fri Jan 29, 2021 11:13 pm
- Forum: Phase Changes & Related Calculations
- Topic: Define Phase Change
- Replies: 78
- Views: 5397
Re: Define Phase Change
Yes, you are right a solid changing to a liquid is a phase change because the matter is changing forms.
- Fri Jan 29, 2021 11:13 pm
- Forum: Phase Changes & Related Calculations
- Topic: Endothermic v. Exothermic
- Replies: 139
- Views: 14337
Re: Endothermic v. Exothermic
I do not believe that there are any exceptions to this rule.
- Fri Jan 29, 2021 11:11 pm
- Forum: Phase Changes & Related Calculations
- Topic: reaction shifts
- Replies: 18
- Views: 805
Re: reaction shifts
In exothermic reactions the reaction will shift to the left if temperature is increased and vice versa for the opposite.
In endothermic reactions the reaction will shift to the right if temperature is increased and vice versa for the opposite.
In endothermic reactions the reaction will shift to the right if temperature is increased and vice versa for the opposite.
- Fri Jan 29, 2021 11:10 pm
- Forum: Phase Changes & Related Calculations
- Topic: Vapor vs gas
- Replies: 121
- Views: 11602
Re: Vapor vs gas
They are essentially the same thing.
- Fri Jan 29, 2021 11:10 pm
- Forum: Phase Changes & Related Calculations
- Topic: H and q
- Replies: 47
- Views: 1710
Re: H and q
Heat is represented by q.
- Fri Jan 29, 2021 11:08 pm
- Forum: Phase Changes & Related Calculations
- Topic: when to assume x is insignificant
- Replies: 86
- Views: 7304
Re: when to assume x is insignificant
It is always good to use the 5% rule to determine if x is insignificant.
- Thu Jan 21, 2021 1:53 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: conjugate base
- Replies: 14
- Views: 504
Re: conjugate base
It will be a strong base.
- Thu Jan 21, 2021 1:28 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Total Pressure
- Replies: 26
- Views: 2030
Re: Total Pressure
It will be the sum of all the species in the system.
- Thu Jan 21, 2021 1:26 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE table values
- Replies: 20
- Views: 891
Re: ICE table values
It is situational, it is best to use the units that are given to you in the problem.
- Thu Jan 21, 2021 1:24 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Ka vs. Kb
- Replies: 30
- Views: 5290
Re: Ka vs. Kb
Ka and Kb are constants for acidity and basicity, respectively. Ka multiplied by Kb will give you the constant for water Kw. We use them when trying to determine either the pH or pOH of a solution.
- Thu Jan 21, 2021 1:16 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Ka correlation to strength of an acid
- Replies: 30
- Views: 2298
Re: Ka correlation to strength of an acid
A larger value of Ka means that the acid is stronger.
- Tue Jan 12, 2021 8:07 pm
- Forum: Ideal Gases
- Topic: T variable in pv=nrt [ENDORSED]
- Replies: 38
- Views: 1700
Re: T variable in pv=nrt [ENDORSED]
It will always be un Kelvin.
- Tue Jan 12, 2021 8:04 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: q vs k
- Replies: 62
- Views: 2648
Re: q vs k
Q is the reaction quotient for any specific moment during a reaction, technically Q does not approach K but the concentrations of the reactant and products will change so that the ratio will be equal to K.
- Tue Jan 12, 2021 8:02 pm
- Forum: Ideal Gases
- Topic: Kp to Kc
- Replies: 6
- Views: 264
Re: Kp to Kc
It is much easier to use PV = nRT than the equation the book gave us.
- Tue Jan 12, 2021 8:00 pm
- Forum: Ideal Gases
- Topic: Does temperature matter?
- Replies: 19
- Views: 601
Re: Does temperature matter?
Yes, temperature does matter as it affects the value of the rate constant.
- Tue Jan 12, 2021 7:59 pm
- Forum: Ideal Gases
- Topic: Units of Temperature
- Replies: 82
- Views: 3811
Re: Units of Temperature
We will most of the time be using Kelvin.
- Wed Dec 16, 2020 4:18 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: HBrO2 vs HClO2
- Replies: 7
- Views: 1059
Re: HBrO2 vs HClO2
In oxo acids the stronger acid is the one that has an atom with greater electronegativity. This is because this atom will pull electrons away from the oxygen and make it easier for it to deprotonate in solution.
- Wed Dec 16, 2020 4:17 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strength of Acids
- Replies: 8
- Views: 893
Re: Strength of Acids
In oxo acids the stronger acid is the one with the more electronegative atom attached to the OH group. This is because the atom will pull the electrons from the oxygen closer to it, making the OH bond more polar. In turn the molecule can deprotonate much easier.
- Wed Dec 16, 2020 4:15 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strength of acid
- Replies: 13
- Views: 738
Re: Strength of acid
In oxo acids the stronger acid is the one that has an atom with greater electronegativity. This is because this atom will pull electrons away from the oxygen and make it easier for it to deprotonate in solution.
- Wed Dec 16, 2020 4:13 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Textbook Question 6C.17: Justification for Base Strength
- Replies: 2
- Views: 264
Re: Textbook Question 6C.17: Justification for Base Strength
If you compare the pKb values between hypobromite and morphine, you will find that the pKb value of hypobromite is lower than that of morphine. This means that hypobromite is a stronger base.
- Wed Dec 16, 2020 4:10 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Why isn't HF a strong acid?
- Replies: 23
- Views: 7436
Re: Why isn't HF a strong acid?
It is because the F is so electronegative that in solution it will not give up its hydrogen very easily.
- Tue Dec 08, 2020 11:52 pm
- Forum: Bronsted Acids & Bases
- Topic: HF
- Replies: 15
- Views: 877
Re: HF
This is because F is the most electronegative atom and will not readily give up its hydrogen.
- Tue Dec 08, 2020 11:49 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: H3O+ versus H+
- Replies: 19
- Views: 5804
Re: H3O+ versus H+
They are the same thing when it comes to solving acid and base problems.
- Tue Dec 08, 2020 11:44 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination Numbers
- Replies: 11
- Views: 637
Re: Coordination Numbers
It will always be the transition metal.
- Tue Dec 08, 2020 11:44 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: determining shape of complex
- Replies: 4
- Views: 340
Re: determining shape of complex
It is the number of bonds.
- Tue Dec 08, 2020 11:42 pm
- Forum: Naming
- Topic: What if I don't know?
- Replies: 8
- Views: 484
Re: What if I don't know?
FrancescaHawkins3J wrote:Just to clarify, are we meant to have the compounds on the chart memorized?
Yes you want to memorize those compound names.
- Sun Nov 29, 2020 2:04 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Bond Angles
- Replies: 9
- Views: 460
Re: Determining Bond Angles
Shalyn Kelly 1L wrote:Are lone pairs what make the bond angles "less than (<) 120" and such? And if there are two lone pairs then the bond angel would be less than less than (<<)?
Yes, that is correct, the lone pairs will make the bond angles smaller since they occupy a larger volume of space.
- Sun Nov 29, 2020 2:01 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 11
- Views: 398
Re: Bond Angles
In general, lone pairs will make the bond angles smaller than the angles if all the regions of electron density were atoms.
- Sun Nov 29, 2020 2:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polar vs non-polar
- Replies: 7
- Views: 388
Re: polar vs non-polar
Yes, that is right when evaluating two different atoms.
- Sun Nov 29, 2020 1:58 pm
- Forum: Hybridization
- Topic: Normalized vs Unnormalized hybrid orbitals
- Replies: 3
- Views: 230
Re: Normalized vs Unnormalized hybrid orbitals
I think it has to do something with the wavefunction of the molecular orbitals being normalized to the value of 1.
- Sun Nov 29, 2020 1:51 pm
- Forum: Hybridization
- Topic: sapling #11
- Replies: 11
- Views: 607
Re: sapling #11
Hybridization can be found by counting the number of lone pairs and atoms bonded to the central molecule.
- Mon Nov 23, 2020 2:41 am
- Forum: Bond Lengths & Energies
- Topic: Melting Point
- Replies: 12
- Views: 656
Re: Melting Point
Whichever molecule has the highest IMF, because then it takes more energy (heat) to break the bonds between atoms.
- Mon Nov 23, 2020 2:40 am
- Forum: Bond Lengths & Energies
- Topic: Bond Length vs Size of Molecule
- Replies: 14
- Views: 817
Re: Bond Length vs Size of Molecule
Both molecules are nonpolar, so the attractive force that determines the boiling point of the molecules is the London Dispersion Force. Since CCL4 is heavier it has greater dispersion forces, raising its boiling point.
- Mon Nov 23, 2020 2:35 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: London Forces [ENDORSED]
- Replies: 19
- Views: 847
Re: London Forces [ENDORSED]
Yes they are found in all bonds, as the electrons in an atom are always travelling around the nucleus, allowing instantaneous dipoles to be created.
- Mon Nov 23, 2020 2:32 am
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Polarizablity
- Replies: 10
- Views: 525
Re: Polarizablity
Polarizability refers to how easily the electron cloud of an atom can be disrupted.
- Mon Nov 23, 2020 2:23 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Formula with Multiple Central Atoms
- Replies: 5
- Views: 2202
Re: VSEPR Formula with Multiple Central Atoms
For a molecule with multiple central atoms, each central atom only has one shape.
This YouTube link is also very helpful when in answering your question.
This YouTube link is also very helpful when in answering your question.
- Sun Nov 15, 2020 3:15 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: is it polar
- Replies: 6
- Views: 522
Re: is it polar
sometime the geometry of a molecule can affect its polarity. BF3, though have a high electronegative difference, is not polar because its geometry cancels the polarity. Can you explain this more? Why does the geometry of BF3 allow the molecule to be polar? Why is this not true for H2O or SO 4 2- ? ...
- Sun Nov 15, 2020 3:08 pm
- Forum: Electronegativity
- Topic: Electronegativity v Electron Affinity
- Replies: 4
- Views: 252
Re: Electronegativity v Electron Affinity
Electronegativity is the property of an atom in a molecule and determines how well an atom attracts electrons.
Electron affinity is the property of a lone atom in its gaseous state and measures the amount of energy that is released when an electron is added to this atom.
Electron affinity is the property of a lone atom in its gaseous state and measures the amount of energy that is released when an electron is added to this atom.
- Sun Nov 15, 2020 3:04 pm
- Forum: Bond Lengths & Energies
- Topic: LDF Bond Strength
- Replies: 11
- Views: 1012
Re: LDF Bond Strength
In the case of London Dispersion Forces, what determines there bond strength is how often two atoms will bond at their instantaneous dipoles. In larger atoms, the attractive force on their valence electrons is less than that of smaller atoms due to electron shielding. This means that these valence e...
- Sun Nov 15, 2020 2:53 pm
- Forum: Bond Lengths & Energies
- Topic: PCI5 lewis structure
- Replies: 5
- Views: 401
Re: PCI5 lewis structure
As long as we are drawing the molecule in such way that people understand it is trigonal bipyramidal, I do not think it really matters which two it is.
- Sun Nov 15, 2020 2:47 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Textbook Exercise 2D.11
- Replies: 3
- Views: 311
Re: Textbook Exercise 2D.11
To identify polarizing power/polarizability, you will need to identify the size of the atom which will be determined by the outermost shell of electrons and how many protons the atom's nucleus has.
- Sun Nov 08, 2020 5:01 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Electron Configuration
- Replies: 10
- Views: 593
Re: Electron Configuration
This rule will apply for other orbitals as well. For example, it would be 4d10 5s2 or 5s2 5p6 5d10 5f14 6s2
- Sun Nov 08, 2020 4:55 pm
- Forum: Bond Lengths & Energies
- Topic: Delocalized Electrons
- Replies: 5
- Views: 350
Re: Delocalized Electrons
In the context of this class, delocalized electrons are present in molecules that have resonance structures i.e. Nitrite. https://www.differencebetween.com/wp-content/uploads/2011/06/Difference-between-Nitrate-and-Nitrite-fig-1.jpg In the molecule nitrite we draw it with three different resonance st...
- Sun Nov 08, 2020 4:42 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: When to use formal charge or octet rule?
- Replies: 12
- Views: 820
Re: When to use formal charge or octet rule?
If the molecule you are drawing has multiple resonance structures it is good to use formal charge in order determine that you have drawn the right representation of the atom.
- Sun Nov 08, 2020 4:38 pm
- Forum: Resonance Structures
- Topic: delocalized electron energy
- Replies: 3
- Views: 160
Re: delocalized electron energy
I am assuming that, due to the fact that delocalized electrons have the ability to move around a molecule, it means they are more free than localized electrons from the effective nuclear charges of the atoms involved in bonding. Which means that they would have more energy.
- Sun Nov 08, 2020 4:27 pm
- Forum: Electronegativity
- Topic: Electron spin part 2
- Replies: 4
- Views: 290
Re: Electron spin part 2
Adding on to that, the fourth quantum number is also important in bonding as valence electrons cannot pair up if they both have the same value for the fourth quantum number.
- Sun Nov 01, 2020 6:59 pm
- Forum: Ionic & Covalent Bonds
- Topic: intermolecular vs intramolecular
- Replies: 17
- Views: 1965
Re: intermolecular vs intramolecular
AnayaArnold_3L wrote:Do we need to know how to identify intramolecular forces?
I am assuming that later on it would be helpful for us to differentiate between the two different forces so that we can explain the chemical behavior of certain molecules and/or atoms.
- Sun Nov 01, 2020 6:51 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonds
- Replies: 9
- Views: 387
Re: Covalent Bonds
Brian_Wu_3G wrote:So which one is it? Is ionic or covalent stronger? There are differing answers here.
Ionic bonds are for sure stronger than covalent bonds.
- Sun Nov 01, 2020 6:43 pm
- Forum: Lewis Structures
- Topic: Octet Rule
- Replies: 12
- Views: 492
Re: Octet Rule
If I remember clearly, later on we will be introduced to the idea of expanded octets as well. Which occur in atoms after the third period of the periodic table.
- Sun Nov 01, 2020 6:15 pm
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 10
- Views: 651
Re: Electronegativity
It is also important to note that in a period on the periodic table, elements with more protons will have a stronger electronegativity since there is a stronger effective nuclear charge.
- Sun Nov 01, 2020 6:10 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electron spin in bonds
- Replies: 8
- Views: 459
Re: Electron spin in bonds
I would have to agree with the previous reply to this comment, and I am assuming that there must be some sort of process that two parallel electrons, or the two bonding atoms, would have to go through in order to successfully create a new molecule.
- Sun Oct 25, 2020 3:20 pm
- Forum: *Shrodinger Equation
- Topic: Sapling Number 6
- Replies: 3
- Views: 182
Re: Sapling Number 6
If there is no input errors from you the only possible thing that I can think of is that it may be a rounding error.
- Sun Oct 25, 2020 2:58 pm
- Forum: *Shrodinger Equation
- Topic: Hamiltonian
- Replies: 3
- Views: 208
Re: Hamiltonian
If I remember correctly, the Hamiltonian represents the kinetic energy of the wave function plus the potential energy of the wave function. The kinetic energy of the wave function represents the energy of the actual motion of the particle, while the potential energy of the wave function represents t...
- Sun Oct 25, 2020 2:47 pm
- Forum: *Shrodinger Equation
- Topic: Wave function
- Replies: 8
- Views: 463
Re: Wave function
FionaHunter21 wrote:Right now, can we consider the wave function to just be simplified to the version where we treat it like a sine function?
Yes, I think it would be safe to assume that for now since the way we are trying to understand the wave function is by using the "particle in a box" analogy.
- Sun Oct 25, 2020 2:44 pm
- Forum: *Shrodinger Equation
- Topic: Understanding of Shrodinger Equation
- Replies: 3
- Views: 174
Re: Understanding of Shrodinger Equation
The wave function will tell you the trajectory of a particle. In this case the particle we are dealing with is an electron, so the wavefunction will tell you the path of the electron outside of the atom. Furthermore, each wave function is different depending on which atomic orbital the electron is l...
- Sun Oct 25, 2020 2:35 pm
- Forum: *Shrodinger Equation
- Topic: Clarrification of EΨ
- Replies: 5
- Views: 369
Re: Clarrification of EΨ
If I remember correctly, the second derivative of the wave function doesn't necessarily equate to the probability of finding an electron, as that would be the wave function squared. All the second derivative would do is tell you the curvature of the wave function at a certain point. As for the Hamil...
- Sun Oct 18, 2020 7:06 pm
- Forum: Properties of Light
- Topic: Spectroscopy Question
- Replies: 2
- Views: 89
Re: Spectroscopy Question
For the Lyman Series, an excited electron reaches the n = 1 level. While for the Balmer series, an excited electron reaches the n = 2 level. Lines in the Lyman Series are in the UV region of light, and lines of the Balmer series are in the visible region of light. This means that electrons in the Ly...
- Sun Oct 18, 2020 6:57 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Bohr frequency condition
- Replies: 5
- Views: 208
Re: Bohr frequency condition
Furthermore, it is important to consider that the Bohr Frequency Condition can only applied to atoms that only have one electron outside of its nucleus.
- Sun Oct 18, 2020 6:51 pm
- Forum: DeBroglie Equation
- Topic: Wavelike Properties
- Replies: 4
- Views: 137
Re: Wavelike Properties
The reason why we say that all objects have wavelike properties, is because all matter has wavelike properties while at the same time exhibiting particle like properties. This means that everything is this world will exhibit wavelike properties, it is just that these wavelengths are much too small t...
- Sun Oct 18, 2020 6:43 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Textbook Example 1B.5
- Replies: 1
- Views: 53
Re: Textbook Example 1B.5
It is because they are accounting for the "plus or minus 1.0e-3m/s". For example, if an object was originally travelling at 10 meters per second and would change speed at "plus or minus 2 meter per second", then the object could either be travelling at 8 meters per second or 12 m...
- Sun Oct 18, 2020 6:36 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Textbook problem 1B.25
- Replies: 1
- Views: 82
Re: Textbook problem 1B.25
To solve this problem we use Heisenberg's Indeterminacy Equation: Delta p x Delta x >= h/(4pi) They already gave us the value for Delta x, which is the diameter of the atom, 350 pm. However, for this problem we want to convert this number to meters which in this case is 3.50 x 10^-10 m. That means w...
- Sat Oct 10, 2020 4:03 pm
- Forum: Properties of Light
- Topic: Photoelectric Effect Post-Module Assessment #33
- Replies: 4
- Views: 257
Re: Photoelectric Effect Post-Module Assessment #33
In order to calculate the minimum energy needed to remove the e- from the surface of the metal we can use the equation: Energy = (Frequency)(h) We know already that h (Planck's Constant) is : 6.626 x 10^-34 J.s. Furthermore, the problem gave us the frequency 1.09 x 10^15 s-1. Now all that has to be ...
- Sat Oct 10, 2020 3:56 pm
- Forum: Limiting Reactant Calculations
- Topic: Limiting Reactant and Limiting Reagent
- Replies: 7
- Views: 268
Re: Limiting Reactant and Limiting Reagent
In technical terms a reagent is a substance or compound that is used to cause a chemical reaction, a reactant is a substance that is consumed in the course of a chemical reaction.
In this case they can be used interchangeably as we are only evaluating balanced chemical equations.
In this case they can be used interchangeably as we are only evaluating balanced chemical equations.
- Sat Oct 10, 2020 3:49 pm
- Forum: Empirical & Molecular Formulas
- Topic: Using Mass of Elements when Calculating Molar Mass
- Replies: 9
- Views: 254
Re: Using Mass of Elements when Calculating Molar Mass
On these sorts of cases I never round the values until the very final answer, just in case I may run into some sort of error.
- Sat Oct 10, 2020 3:32 pm
- Forum: Properties of Electrons
- Topic: Question 1A.3
- Replies: 2
- Views: 119
Re: Question 1A.3
If we approach this problem from a graphical standpoint it will be easier to understand "extent of the change in the electrical field". Imagine we graph two different waves of light (light is a form of electromagnetic radiation) - one of the waves of light has a lower frequency than the ot...
- Sat Oct 10, 2020 3:21 pm
- Forum: DeBroglie Equation
- Topic: Focus 1 Textbook Problem 1B: #19
- Replies: 2
- Views: 141
Re: Focus 1 Textbook Problem 1B: #19
For this problem you have to look up the mass of a neutron and the mass of a proton; the mass of a proton is around 1.672*10^-27 kg and the mass of a neutron is around 1.675*10^-27 kg. With this information you can then find the wavelength of each particle using De Broglie's Equation. You then take ...