Search found 103 matches
- Sat Mar 14, 2020 11:47 am
- Forum: Balancing Redox Reactions
- Topic: Writing balanced half reactions
- Replies: 2
- Views: 261
Re: Writing balanced half reactions
It depends whether the half-reaction is oxidized or reduced. In oxidized half-reaction, the electrons will be on the right side of the reaction because of the loss of electrons. In reduced half-reaction, the electrons will be on the left side of the reaction because of the gain of electrons.
- Sat Mar 14, 2020 11:43 am
- Forum: Zero Order Reactions
- Topic: zero order reactions
- Replies: 5
- Views: 402
Re: zero order reactions
Also, zero-order reactants have an exponent of zero, which makes the reactant negligible to the overall rate law.
- Thu Mar 12, 2020 6:59 pm
- Forum: Balancing Redox Reactions
- Topic: Balancing the redox rxn in an acidic solution
- Replies: 5
- Views: 353
Re: Balancing the redox rxn in an acidic solution
After separating the redox reactions into two half reactions, you add H2O to balance oxygens in each half reaction, and add H+ to balance hydrogen in each half reaction.
- Thu Mar 12, 2020 2:28 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation Energy and the Rate Constant
- Replies: 4
- Views: 372
Re: Activation Energy and the Rate Constant
a higher activation energy is a lower rate constant because the reaction occurs slower. It is an inverse relationship.
- Thu Mar 12, 2020 2:25 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: salt bridge
- Replies: 11
- Views: 670
Re: salt bridge
the salt bridge allows the flow of ions between the anode and cathode solutions.
- Thu Mar 12, 2020 2:12 pm
- Forum: General Rate Laws
- Topic: Factors Affecting k
- Replies: 83
- Views: 5589
Re: Factors Affecting k
yes k can change, but only due to temperature.
- Thu Mar 12, 2020 2:11 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5I.29
- Replies: 3
- Views: 355
Re: 5I.29
you would use an ICE table for this problem since you have an initial partial pressure and the k value
- Thu Mar 12, 2020 2:08 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: delta U= delta H
- Replies: 21
- Views: 1591
Re: delta U= delta H
under constant volume delta U equals delta H because at constant pressure q equals H and at constant volume no work is being done, so in that case U=q which is U=H in contact pressure and volume.
- Thu Mar 12, 2020 2:05 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: determining k
- Replies: 13
- Views: 604
Re: determining k
yes you can use any one trial
- Tue Mar 10, 2020 7:07 pm
- Forum: General Rate Laws
- Topic: orders
- Replies: 6
- Views: 481
Re: orders
you use the table to find the order of each reactant. To do this, you have to keep all reactants constant at two different experiments, except for the one you want to calculate. Then compare the quotient of the concentration of the reactant you want to calculate to the quotient of the initial reacti...
- Tue Mar 10, 2020 6:50 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation Energy vs. Free Energy of Activation
- Replies: 3
- Views: 326
Re: Activation Energy vs. Free Energy of Activation
Activation energy is the minimum amount of energy needed for the reaction to proceed. Free energy is the difference in energy between reactants and products. Free energy is calculated as products minus reactants, so if the sign of the free energy is negative it is a spontaneous reaction, and if the ...
- Tue Mar 10, 2020 6:37 pm
- Forum: Zero Order Reactions
- Topic: 0 order
- Replies: 14
- Views: 1552
Re: 0 order
zero order means k is a constant, and it is not changed by differences on concentration of reactants. The rate law is just equal to k.
- Tue Mar 10, 2020 6:34 pm
- Forum: Van't Hoff Equation
- Topic: Van’t Hoff Equation
- Replies: 11
- Views: 945
Re: Van’t Hoff Equation
You can calculate K at different temperatures with the Van't Hoff equation. I don't see how it relates to DeltaG though because the only relation between DeltaG and K is with standard DeltaG, and since Van't Hoff equation doesn't calculate K at standard conditions, you can't use that K in the equati...
- Tue Mar 10, 2020 6:29 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: catalysts in balanced equations
- Replies: 6
- Views: 496
Re: catalysts in balanced equations
So if the catalyst is not present in the products of the final reaction, does that mean it is fully consumed throughout the overall reaction?
- Tue Mar 10, 2020 6:26 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: delta g
- Replies: 6
- Views: 419
Re: delta g
If we are given a chemical reaction formula and have the DeltaG values similar to that of the midterm, then we would use products minus reactants. However, if given entropy or enthalpy, I believe we would be prompted to use the DeltaG = DeltaH - TDeltaS.
- Tue Mar 10, 2020 6:10 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Finding k1 when given two temperatues
- Replies: 6
- Views: 485
Re: Finding k1 when given two temperatues
T1 and K1 need to correlate, and T2 and K2 need to correlate. The order only matters in regard to changing whether there is a negative sign or not.
- Tue Mar 10, 2020 6:09 pm
- Forum: First Order Reactions
- Topic: first order rate of consumption
- Replies: 2
- Views: 220
Re: first order rate of consumption
Yes, you can use concentration, mass, pressure, or whatever the problem indicates. I'm sure it will be stated in the problem or be able to be inferred which units to use.
- Tue Mar 10, 2020 6:07 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Ka Kb
- Replies: 11
- Views: 692
Re: Ka Kb
Ka is the equilibrium constant for a weak acid dissociating
Kb is the equilibrium constant for a weak base dissociating
pKa = -log[Ka]
pKb = -log[Kb]
Kb is the equilibrium constant for a weak base dissociating
pKa = -log[Ka]
pKb = -log[Kb]
- Tue Mar 10, 2020 1:17 am
- Forum: Balancing Redox Reactions
- Topic: Balancing redox with h2o
- Replies: 9
- Views: 651
Re: Balancing redox with h2o
you use h2o to balance the oxygens in your half reactions, then depending whether it is in an acidic or basic solution, you use h+ and oh- to balance the hydrogens in your half reactions. h+ for acidic solution, and oh- for basic solution.
- Tue Mar 10, 2020 1:13 am
- 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: The Third Law
- Replies: 3
- Views: 321
Re: The Third Law
It is because entropy is the disorder in the universe, so as temperature approaches absolute zero, there is less and less disorder. You can think of it as high temperature is a higher state of disorder since molecules are moving more and moving faster, so low temperature would be slower and less mov...
- Tue Mar 10, 2020 1:10 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n=2
- Replies: 7
- Views: 508
Re: n=2
n is the total number of electrons transferred, so when you get your final balanced reaction from the two half cell reactions, whatever number you used to cancel your electrons from the two half cell reactions is the number of electrons transferred.
- Tue Mar 10, 2020 1:07 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Finding pOH of a solution given the pKb of a conjugate acid?
- Replies: 3
- Views: 291
Re: Finding pOH of a solution given the pKb of a conjugate acid?
Since you already found pH, you can use the equation pOH + pH = 14 to get 14 - pH = pOH and substitute your calculated pH.
- Tue Mar 10, 2020 1:03 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration
- Replies: 9
- Views: 567
Re: Concentration
you use the nernst equation and make Q = [anode]/[cathode]
- Tue Mar 10, 2020 1:00 am
- Forum: Ideal Gases
- Topic: Partial Pressure
- Replies: 13
- Views: 756
Re: Partial Pressure
because there are less moles on the right side, so as volume decreases, the side with less moles will increase.
- Tue Mar 10, 2020 12:58 am
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: deltaG at equilibrium
- Replies: 8
- Views: 730
Re: deltaG at equilibrium
yes because there is no more potential energy for the reaction to move in any direction.
- Mon Mar 09, 2020 10:09 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: endothermic reaction
- Replies: 5
- Views: 434
Re: endothermic reaction
If you add heat to this reaction, the concentration of products will increase since it is an endothermic reaction. I don't think you can add heat to a specific side.
- Mon Mar 09, 2020 10:08 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: exothermic reaction
- Replies: 4
- Views: 379
Re: exothermic reaction
If you add heat to this reaction, the reactants will increase in concentration since it is an exothermic reaction. I don't think you can add heat to a specific side.
- Mon Mar 09, 2020 10:07 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Going from pKa to pH
- Replies: 10
- Views: 729
Re: Going from pKa to pH
You can use pKa to find the concentration of [H+] through an ICE box, then using the [H+] concentration, you can find pH by plugging [H+] into the equation pH=-log[H+]
- Mon Mar 09, 2020 2:25 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Delta H
- Replies: 10
- Views: 928
Re: Delta H
You can find delta H either through products minus reactants, or Hess's law, or the Gibbs free energy equation delta G = delta H - T delta S
- Mon Mar 09, 2020 2:17 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell diagram
- Replies: 7
- Views: 429
Re: Cell diagram
In a cell diagram, when there is no phase change, you separate with commas, if there is a phase change, you separate with a vertical line, and when changing from anode to cathode you use double vertical lines.
- Wed Mar 04, 2020 12:08 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6K.3
- Replies: 1
- Views: 166
6K.3
Balance each of the following skeletal equations by using oxidation and reduction half-reactions. All the reactions take place in acidic solution. Identify the oxidizing agent and reducing agent in each reaction.
(d) Reaction of chlorine in water:
Cl2(g) > HClO(aq) + Cl2(g)
How do you do part d?
(d) Reaction of chlorine in water:
Cl2(g) > HClO(aq) + Cl2(g)
How do you do part d?
- Fri Feb 28, 2020 2:25 am
- Forum: Balancing Redox Reactions
- Topic: When to add H+ or H20
- Replies: 19
- Views: 2502
Re: When to add H+ or H20
You add H20 to balance the number of oxygens in acidic/basic solutions. You add H+ to balance the number of hydrogens in an acidic solution. You add OH- to balance the number of hydrogens in a basic solution.
- Fri Feb 28, 2020 2:23 am
- Forum: Balancing Redox Reactions
- Topic: How to tell if its being reduced or oxidized
- Replies: 15
- Views: 2160
Re: How to tell if its being reduced or oxidized
To find the charge of Mn, you would first find the charge of oxygen in that compound, which is -2, and then multiply it by the number of oxygen atoms. So for MnO4- the oxygen part of the compound is -2*4, which is -8. Finally, to find the charge of Mn, you set the charge of Mn plus the charge of O4 ...
- Sat Feb 15, 2020 4:14 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Equilibrium
- Replies: 5
- Views: 264
Re: Equilibrium
delta G is zero at equilibrium, but delta H and delta S do not have to be zero at equilibrium.
- Sat Feb 15, 2020 4:06 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isobaric systems
- Replies: 16
- Views: 845
Re: Isobaric systems
Isobaric means constant pressure, so at constant pressure q=deltaH, w= -PV.
- Sat Feb 15, 2020 4:04 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: adiabatic
- Replies: 19
- Views: 1073
Re: adiabatic
An adiabatic process is when no heat is transferred.
- Sat Feb 15, 2020 3:59 pm
- Forum: Van't Hoff Equation
- Topic: Equation
- Replies: 5
- Views: 342
Re: Equation
You can use this equation to find when delta G is closest to delta H, to do this, you would find a reaction with the lowest entropy(delta S)
- Sat Feb 15, 2020 3:57 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Enthalpies of Formation
- Replies: 10
- Views: 587
Re: Standard Enthalpies of Formation
Elements in their standard state have an enthalpy of formation of zero, such as O2 and H2
- Sat Feb 15, 2020 3:41 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: P1/P2
- Replies: 10
- Views: 1241
Re: P1/P2
Boyle's Law proves that volume and pressure are inversely related.
- Sat Feb 15, 2020 3:36 pm
- Forum: Phase Changes & Related Calculations
- Topic: Delta H Fusion
- Replies: 9
- Views: 713
Re: Delta H Fusion
You have to account for phase change. Melting ice goes from solid to liquid, so you have to add the equation for solid: q=mCdeltaT, to the phase change equation from solid to liquid: q=mdeltaH. mass(m) can also be in moles(n).
- Sat Feb 15, 2020 3:27 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Delta U = 0
- Replies: 8
- Views: 552
Re: Delta U = 0
delta U is zero at constant temperature
- Sat Feb 15, 2020 3:15 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Intensive and Extensive Properties
- Replies: 8
- Views: 1888
Re: Intensive and Extensive Properties
Intensive property does not depend on the amount, extensive property depends on the amount. An example of an intensive property is heat capacity, an example of an extensive property is specific heat capacity.
- Sat Feb 15, 2020 3:08 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Meaning of q=-w
- Replies: 14
- Views: 2365
Re: Meaning of q=-w
When q=-w, internal energy is equal to 0, which indicates constant temperature.
- Sat Feb 15, 2020 3:07 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Negative work
- Replies: 14
- Views: 953
Re: Negative work
A system's work is negative when that system does work, Work is positive for a system if work is done on that system.
- Sat Feb 15, 2020 3:03 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Rules for constant pressure
- Replies: 4
- Views: 279
Re: Rules for constant pressure
At constant pressure, Work = Pressure * Volume, q=Enthalpy, and at constant volume work=0 .
- Sat Feb 15, 2020 2:51 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: Boltzmann Equation
- Replies: 10
- Views: 610
Re: Boltzmann Equation
The Boltzman equation is used to find residual entropy .
- Mon Feb 10, 2020 10:44 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy Change due to Changes in Temperature
- Replies: 2
- Views: 155
Re: Entropy Change due to Changes in Temperature
I believe the temperature would be calculated in Kelvin since that is the standard temperature we have been using.
- Mon Jan 27, 2020 12:07 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Exothermic reaction
- Replies: 18
- Views: 737
Re: Exothermic reaction
In an exothermic reaction when temp is increased, the reaction shifts towards the reactants, and when temp is decreased, the reaction shifts towards the products.
- Mon Jan 27, 2020 12:01 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Calculating K
- Replies: 15
- Views: 774
Re: Calculating K
You need balanced equations so you can have the correct coefficients when calculating k. When calculating k the coefficients of the balanced equation become the exponents of the k equation.
- Sun Jan 26, 2020 11:57 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Signs for enthalpy
- Replies: 8
- Views: 517
Re: Signs for enthalpy
Enthalpies can be negative, indicating an exothermic reaction.
- Sun Jan 26, 2020 11:53 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: delta s
- Replies: 5
- Views: 240
Re: delta s
Delta s is entropy. Delta h is enthalpy.
- Sun Jan 26, 2020 11:52 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: pressure and enthalpy
- Replies: 5
- Views: 255
Re: pressure and enthalpy
Pressure and enthalpy have a direct relationship, meaning that when pressure increases so does enthalpy.
- Sun Dec 08, 2019 11:44 pm
- Forum: Biological Examples
- Topic: heme group
- Replies: 4
- Views: 285
Re: heme group
Heme group has Fe in the center, and 4 N atoms binded with an additional 2 lone pairs of electrons on the Fe. An oxygen can bind to one of the lone pairs.
- Sun Dec 08, 2019 9:51 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis Acids.
- Replies: 4
- Views: 1426
Re: Lewis Acids.
Lewis acids are electron acceptors, so the structure or compound that can accept electrons is a Lewis acid.
- Sun Dec 08, 2019 8:43 pm
- Forum: Air Pollution & Acid Rain
- Topic: Carbon Dioxide and respiratory acidosis
- Replies: 5
- Views: 1234
Re: Carbon Dioxide and respiratory acidosis
excess carbon dioxide reacts with water to make the acid H2CO3. The production of the acid H2CO3 makes the pH of our blood lower (acidic) which leads to respiratory acidosis.
- Sun Dec 08, 2019 8:41 pm
- Forum: Polyprotic Acids & Bases
- Topic: Amphiprotic vs Amphoteric
- Replies: 6
- Views: 620
Re: Amphiprotic vs Amphoteric
Amphiprotic is more specific in saying that the compound can both donate and accept protons, but amphoteric just means a compound has acidic and basic properties, not the real principle of what it means to be a bronsted acid or base.
- Sun Dec 08, 2019 8:36 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: Equilibrium sign
- Replies: 9
- Views: 908
Re: Equilibrium sign
No, since strong acids and bases are completely dissociated, it is only a one way reaction. Weak acids and bases use the equilibrium sign because the weak acid/base is not completely dissociated, so there are still H+ or OH- ions on the reactant side, as well as some on the products side.
- Sun Dec 08, 2019 8:33 pm
- Forum: Air Pollution & Acid Rain
- Topic: Respiratory Acidosis
- Replies: 4
- Views: 613
Re: Respiratory Acidosis
When there is too much CO2 in our bodies, it reacts with H20 and creates an acid H2CO3, which lowers the pH in our blood (acidosis).
- Sun Dec 08, 2019 8:31 pm
- Forum: Resonance Structures
- Topic: Best Resonance Structure
- Replies: 5
- Views: 536
Re: Best Resonance Structure
The best resonance structure is when the central atom has a formal charge closest to 0, that is when the structure is most stable.
- Sun Dec 08, 2019 8:29 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Equilibrium calculations
- Replies: 6
- Views: 413
Re: Equilibrium calculations
Equilibrium calculation are 14B because they require an ICE box, which Dr. Lavelle explicitly stated we would not have to do on the final.
- Sun Dec 08, 2019 8:27 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Kw
- Replies: 2
- Views: 302
Re: Kw
Kw is used in the equation Ka*Kb=Kw, and pKa+pKb=pKw and -log[Kw]=pKw
- Sun Dec 08, 2019 8:25 pm
- Forum: Amphoteric Compounds
- Topic: As2O and Bi2O3
- Replies: 4
- Views: 337
Re: As2O and Bi2O3
Because As and Bi are along the metalloid line. The other ones we need to know are also that Metal oxides are basic, and nonmetal oxides are acidic.
- Sun Dec 08, 2019 8:21 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: boiling point
- Replies: 9
- Views: 958
Re: boiling point
Stronger intermolecular forces have a higher boiling point. If same IMF, such as LDF, the larger molecule will have a higher boiling point.
- Sun Dec 08, 2019 8:14 pm
- Forum: Biological Examples
- Topic: Hemoglobin and Myoglobin
- Replies: 4
- Views: 451
Re: Hemoglobin and Myoglobin
4 myoglobin make up one hemoglobin. Oxygen binds to myoglobin, and it is transferred in hemoglobin.
- Sun Dec 08, 2019 8:12 pm
- Forum: Dipole Moments
- Topic: Hydrogen bonds
- Replies: 9
- Views: 610
Re: Hydrogen bonds
Hydrogen bonds are a bond between hydrogen and either O,F,N. Potential hydrogen bonding sites are a lone pair on an O,F,N atom binded to an H, or H binded to O,F,N.
- Sun Dec 08, 2019 8:09 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Stronger acid?
- Replies: 13
- Views: 1235
Re: Stronger acid?
HClO2 would be the stronger acid because it has a greater number of oxygen atoms attached to the central atom, making the oxidation number of the central atom greater.
Re: Cisplatin
The Cl atoms in cisplatin bind to the nitrogens with lone pairs on Guanine. Also, remember that cis cisplatin structure binds stronger than trans cisplatin structure.
- Fri Dec 06, 2019 1:50 am
- Forum: Bronsted Acids & Bases
- Topic: HF is a weak acid?
- Replies: 8
- Views: 1179
Re: HF is a weak acid?
HF bond is very small and strong, making it harder to dissociate in water.
- Fri Dec 06, 2019 1:26 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining polarity from VSPER
- Replies: 4
- Views: 473
Re: Determining polarity from VSPER
you can't tell polarity just from the VSEPR formula. You need the VSEPR model to tell the shape.
- Fri Dec 06, 2019 1:23 am
- Forum: Properties of Light
- Topic: Light Absorbed/ emitted
- Replies: 4
- Views: 388
Re: Light Absorbed/ emitted
Light is emitted if there is a quantum drop, and light is absorbed when there is a quantum jump.
- Fri Dec 06, 2019 1:21 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Coordination #
- Replies: 6
- Views: 501
Re: Coordination #
The coordination number is the number of Ligands attached to the central transition metal
- Fri Dec 06, 2019 1:20 am
- Forum: Amphoteric Compounds
- Topic: Amphiprotic vs Amphoteric
- Replies: 5
- Views: 596
Re: Amphiprotic vs Amphoteric
Amphiprotic means you could either lose a proton or gain a proton, like water. Amphoteric means being able to act as a base and an acid.
- Fri Dec 06, 2019 1:18 am
- Forum: Ionic & Covalent Bonds
- Topic: Coulombs equation
- Replies: 4
- Views: 338
Re: Coulombs equation
the force of attraction between two atoms is the absolute value of the product of the charges of the two atoms divided by the distance from each nucleus squared.
- Fri Dec 06, 2019 1:15 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Determining Shape and Placement of atoms
- Replies: 1
- Views: 200
Re: Determining Shape and Placement of atoms
The least electronegative atom is in the middle of the lewis structure, and the other atoms are formed to meet the required number of bonds and lone electron pairs.
- Fri Dec 06, 2019 1:14 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Shape
- Replies: 1
- Views: 150
Re: Shape
it is octahedral because there are 6 ligands: three NH3 and three Cl
- Fri Dec 06, 2019 1:03 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Bonding Sites
- Replies: 1
- Views: 180
Re: Bonding Sites
There can be, coordination numbers can be as high as 12
- Fri Dec 06, 2019 12:49 am
- Forum: Naming
- Topic: Writing formulas for coordination compounds
- Replies: 2
- Views: 198
Re: Writing formulas for coordination compounds
Yes coordination compounds are always neutral.
- Fri Dec 06, 2019 12:45 am
- Forum: Lewis Acids & Bases
- Topic: H2PO4-
- Replies: 2
- Views: 121
Re: H2PO4-
Because in water it acts as an acid
- Fri Dec 06, 2019 12:39 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Formulas
- Replies: 2
- Views: 198
Re: VSEPR Formulas
Yes it is bent, VSEPR is AX2E1
- Sat Nov 16, 2019 4:56 pm
- Forum: Dipole Moments
- Topic: Hydrogen bonds
- Replies: 17
- Views: 822
Re: Hydrogen bonds
Hydrogen bonds can only form with O, N, and F
- Sat Nov 16, 2019 4:55 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: strongest intermolecular forces
- Replies: 7
- Views: 768
Re: strongest intermolecular forces
Hydrogen bond > dipole dipole > london dispersion
- Sat Nov 16, 2019 4:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar vs. Nonpolar
- Replies: 12
- Views: 822
Re: Polar vs. Nonpolar
In a polar molecule, there is a distinct dipole moment, and in a nonpolar molecule, there is no dipole moment because they cancel out.
- Wed Nov 06, 2019 9:31 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Rydberg equation
- Replies: 9
- Views: 556
Rydberg equation
Why are we not allowed to use the Rydberg equation frequency = R( 1/n1^2 - 1/n2^2)?
- Wed Nov 06, 2019 9:28 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum numbers
- Replies: 12
- Views: 775
Quantum numbers
Which quantum number is the angular momentum?
- Mon Oct 28, 2019 1:16 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configurations
- Replies: 3
- Views: 264
Re: Electron Configurations
I believe we just need to know how to write out electron configuration, but it would be useful to understand the shapes for conceptual problems.
- Mon Oct 28, 2019 1:14 am
- Forum: Resonance Structures
- Topic: strength of bonding?
- Replies: 2
- Views: 116
Re: strength of bonding?
It depends on the resonance structure. For example, if a resonance structure changed from a two double bonds to one single and one triple bond, than the triple bond has an increased strength than the previous double bond.
- Mon Oct 28, 2019 1:11 am
- Forum: Octet Exceptions
- Topic: expanded octet?
- Replies: 9
- Views: 472
Re: expanded octet?
Their valence shells have enough orbitals to accommodate extra electrons.
- Mon Oct 28, 2019 1:02 am
- Forum: Trends in The Periodic Table
- Topic: Central Atom
- Replies: 13
- Views: 544
Re: Central Atom
The central atom is the atom with the lowest ionization energy.
- Mon Oct 28, 2019 1:01 am
- Forum: Trends in The Periodic Table
- Topic: Ionization Energy
- Replies: 5
- Views: 352
Re: Ionization Energy
Ionization energy increases from left to right because the atomic radius decreases from left to right, which results in a stronger pull between electrons and the nucleus.
- Mon Oct 21, 2019 12:03 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals and Energy Levels
- Replies: 2
- Views: 134
Re: Orbitals and Energy Levels
within the energy level, the volume of space is called the orbital.
- Sun Oct 20, 2019 11:43 pm
- Forum: Trends in The Periodic Table
- Topic: memorization
- Replies: 3
- Views: 294
Re: memorization
A quick tip for trends is that atomic radius increases as you go down and left, while ionization energy and electronegativity increase as you go up and to the right.
- Sun Oct 20, 2019 11:19 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lewis Structure
- Replies: 5
- Views: 311
Re: Lewis Structure
The negative implies that the structure has a negative charge and therefore more electrons. You would have to take this into account when making the Lewis structure by adding the additional electron to the total amount.
- Wed Oct 16, 2019 11:07 am
- Forum: Properties of Light
- Topic: The extent of the change in the electrical field
- Replies: 2
- Views: 159
Re: The extent of the change in the electrical field
The electric field is a force field around a charged particle indicating the direction the electric force would push the particle. So I believe a change in the electric field is either a change in the charge of the particle, or a change on the electric forces around the particle.
- Wed Oct 16, 2019 11:01 am
- Forum: Einstein Equation
- Topic: Meaning of h [ENDORSED]
- Replies: 5
- Views: 467
Re: Meaning of h [ENDORSED]
The meaning of h is just the change of rate of energy because E=hv, and h is just the slope.
- Wed Oct 16, 2019 10:58 am
- Forum: Properties of Light
- Topic: Wave Frequency
- Replies: 9
- Views: 505
Re: Wave Frequency
According to the wave model, frequency is the amount of energy in a single photon. This is proven in the experiment where increasing intensity of did not remove the electron, but increasing frequency of light did remove the electron. In this experiment it shows that frequency is the energy in a sing...
- Wed Oct 16, 2019 10:53 am
- Forum: Properties of Electrons
- Topic: electrons ejected [ENDORSED]
- Replies: 3
- Views: 260
Re: electrons ejected [ENDORSED]
Yes, the ionization energy is the energy it takes to remove an electron, making it the threshold energy. So the energy of the light has to be equal to or greater than the threshold energy to successfully surpass the threshold energy, and remove the electron.
- Sat Oct 05, 2019 5:40 pm
- Forum: Significant Figures
- Topic: Sig Figs in % Yield
- Replies: 10
- Views: 6536
Re: Sig Figs in % Yield
You would round up to 64%
- Sat Oct 05, 2019 5:36 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Accuracy v Precision
- Replies: 11
- Views: 547
Re: Accuracy v Precision
Accuracy is how close the obtained value is to the correct value. Precision is how close the obtained values are to each other.
- Sat Oct 05, 2019 5:34 pm
- Forum: SI Units, Unit Conversions
- Topic: When is Test #1?
- Replies: 9
- Views: 519
Re: When is Test #1?
Test number 1 is during your discussion this upcoming week, and it covers the fundamentals of chemistry we have been reviewing.
- Sat Oct 05, 2019 5:28 pm
- Forum: SI Units, Unit Conversions
- Topic: Conversions
- Replies: 2
- Views: 172
Re: Conversions
To convert 2.29 x 10^-4 grams to micrograms, you would have to use the conversion factor of 1 x 10^-6 grams which equals 1 microgram. So by using this conversion, you would do (2.29 x 10^-4 grams) x (1 microgram/1 x 10^-6 grams) = 2.29 x 10^2 micrograms.