Search found 102 matches
- Sun Mar 15, 2020 7:21 am
- Forum: Van't Hoff Equation
- Topic: Celcius vs Kelvin for T1 and T2
- Replies: 84
- Views: 6449
Re: Celcius vs Kelvin for T1 and T2
you should always convert to Kelvin
- Sun Mar 15, 2020 7:20 am
- Forum: Ideal Gases
- Topic: T variable in pv=nrt [ENDORSED]
- Replies: 38
- Views: 1548
Re: T variable in pv=nrt [ENDORSED]
You should convert temperature to kelvin because you are using R which uses Kelvin.
- Sun Mar 15, 2020 7:17 am
- Forum: Van't Hoff Equation
- Topic: K rather than Kc
- Replies: 10
- Views: 706
Re: K rather than Kc
I always assume they are the same, but I guess when you are referring to gases, K is Kp, and Kp is not equal to Kc.
- Sun Mar 15, 2020 7:13 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Flipping the anode
- Replies: 4
- Views: 352
Re: Flipping the anode
All half equations are written as reduction, so we would flip the anode in order to make the reaction a redox reaction.
- Sat Mar 14, 2020 6:41 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: K
- Replies: 2
- Views: 251
Re: K
at equilibrium, k=Q, so if you are substituting K for Q in the Nernst equation, then that means that the reaction is at equilibrium.
- Sat Mar 14, 2020 6:37 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: steady state
- Replies: 2
- Views: 194
Re: steady state
I do not think we need to know how to use that.
- Sat Mar 14, 2020 6:36 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram
- Replies: 11
- Views: 713
Re: Cell Diagram
yes, we use pt for solid if there is no other solid stated
- Sat Mar 14, 2020 6:33 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Internal Energy
- Replies: 6
- Views: 565
Re: Internal Energy
isothermal means that temperature is constant therefore internal energy would be 0
- Sat Mar 14, 2020 6:28 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Slow and Fast Step
- Replies: 7
- Views: 513
Re: Slow and Fast Step
Yes, by knowing the order of the slow step, you can determine the rate of the overall reaction.
- Sat Mar 14, 2020 6:15 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: intermediate v. catalyst
- Replies: 6
- Views: 417
Re: intermediate v. catalyst
An intermediate is formed in one step and then it is consumed in another step. A catalyst on the other hand is not consumed by the reaction.
- Tue Mar 10, 2020 1:16 am
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Developing a Proposed Reaction Mechanism
- Replies: 3
- Views: 234
Re: Developing a Proposed Reaction Mechanism
I do not think we would have to develop our own reaction, but we just have to recognize if a "proposed" reaction would correspond to the rate law.
- Tue Mar 10, 2020 1:14 am
- Forum: General Rate Laws
- Topic: Overall rate law
- Replies: 8
- Views: 588
Re: Overall rate law
Because it is the slowest reaction, it is the "rate determining step" and the overall reaction would depend on it.
- Tue Mar 10, 2020 1:12 am
- Forum: General Rate Laws
- Topic: Catalysts and Rate Laws
- Replies: 2
- Views: 190
Re: Catalysts and Rate Laws
i don't think you would include it in the overall reaction if it gets consumed.
- Tue Mar 10, 2020 1:11 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Finding pOH of a solution given the pKb of a conjugate acid?
- Replies: 3
- Views: 265
Re: Finding pOH of a solution given the pKb of a conjugate acid?
you would just use pOH + pH = 14
- Tue Mar 10, 2020 1:10 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: 521
Re: Concentration
You would use Ecell = Ecell o - RT/nF lnQ where Q would equal to [products]/[reactants] and in that situation, it was [anode]/[cathode]
- Tue Mar 10, 2020 1:07 am
- Forum: General Rate Laws
- Topic: Book Problem 7A.17
- Replies: 3
- Views: 293
Re: Book Problem 7A.17
Because the rate constant did not change, then it's zero order.
- Tue Mar 10, 2020 1:04 am
- Forum: Ideal Gases
- Topic: Partial Pressure
- Replies: 13
- Views: 693
Re: Partial Pressure
When you decrease the volume, you're increasing the pressure. Therefore, the reaction would favor the side with less moles, which is the products side. And because the reaction shifts forward, the partial pressure of NO2 will increase.
- Tue Mar 10, 2020 12:57 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics v Therodynamics
- Replies: 8
- Views: 539
Re: Kinetics v Therodynamics
Kinetics focuses more on the rate of the reaction while thermodynamics focuses more on whether a reaction will occur or not.
- Tue Mar 10, 2020 12:55 am
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: intermediate
- Replies: 26
- Views: 1942
Re: intermediate
Intermediates are formed in one reaction and then consumed in the other, so they do not show up in rate laws.
- Tue Mar 10, 2020 12:54 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Reactant for Initial Rate
- Replies: 2
- Views: 172
Re: Reactant for Initial Rate
initial rate is instantaneous rate at the start of a reaction, so we know that there is no product formed. Therefore, we only use the reactants for initial rate.
- Tue Mar 10, 2020 12:50 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Work and Delta G
- Replies: 4
- Views: 211
Re: Work and Delta G
Yeah I think it's true for all reactions.
- Mon Mar 09, 2020 2:19 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell diagram
- Replies: 7
- Views: 388
Re: Cell diagram
use commas instead of the "|"
- Mon Mar 09, 2020 12:44 am
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: k' vs kr
- Replies: 13
- Views: 767
Re: k' vs kr
K' is reverse reaction
- Mon Mar 09, 2020 12:38 am
- Forum: Student Social/Study Group
- Topic: Final
- Replies: 21
- Views: 1362
Re: Final
yeah I still think we're supposed to go to the designated location.
- Mon Mar 09, 2020 12:06 am
- Forum: Second Order Reactions
- Topic: [A] v. Time
- Replies: 27
- Views: 1144
Re: [A] v. Time
for second order, it should be linear
- Mon Mar 09, 2020 12:05 am
- Forum: First Order Reactions
- Topic: equation derivations
- Replies: 5
- Views: 378
Re: equation derivations
i do not think so
- Mon Mar 09, 2020 12:04 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n in NFE
- Replies: 64
- Views: 2942
Re: n in NFE
n is the number of moles of electrons transferred
- Mon Mar 09, 2020 12:03 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: galvanic vs electrolytic
- Replies: 12
- Views: 813
Re: galvanic vs electrolytic
galvanic cells have a positive standard E and are spontaneous while electrolytic cells have a negative standard E and are nonspontaneous.
- Mon Mar 09, 2020 12:01 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n=2
- Replies: 7
- Views: 469
Re: n=2
n should be the moles of electrons
- Mon Mar 09, 2020 12:01 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Arrhenius Theory
- Replies: 3
- Views: 276
Re: Arrhenius Theory
It basically states that acids ionize in water and produce H+ while bases ionize in water to produce OH-.
- Sun Mar 08, 2020 11:59 pm
- Forum: Balancing Redox Reactions
- Topic: Reversing the anode
- Replies: 10
- Views: 655
Re: Reversing the anode
Because we need to show that it is being oxidized, so we flip it
- Sun Mar 08, 2020 11:57 pm
- Forum: General Rate Laws
- Topic: Elementary reactions
- Replies: 5
- Views: 295
Re: Elementary reactions
It's a single reaction step. It's when the products are formed in only a single reaction.
- Mon Feb 24, 2020 8:45 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6L.3 b
- Replies: 1
- Views: 144
Re: 6L.3 b
Since they are electric conductors, they will be used to make the electrodes so they do not participate in the reaction.
- Mon Feb 24, 2020 8:37 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: n
- Replies: 13
- Views: 713
Re: n
n is the number of moles, but if you meant which R you should use, then use 8.314
- Mon Feb 24, 2020 8:35 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagrams
- Replies: 9
- Views: 564
Re: Cell Diagrams
"||" = salt bridge while "|" = phase change
- Mon Feb 24, 2020 8:32 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration and Cell Potential
- Replies: 5
- Views: 2850
Re: Concentration and Cell Potential
when reactants increase or products decrease, the reaction proceeds forward causing the cell potential to increase. And when the reactants decrease or products increase, the reaction proceeds to the left, causing the cell potential to decrease.
- Mon Feb 24, 2020 8:28 pm
- Forum: Balancing Redox Reactions
- Topic: Half reactions
- Replies: 17
- Views: 827
Re: Half reactions
That happens when the both the reactants and products have the same number of electrons.
- Mon Feb 24, 2020 8:27 pm
- Forum: Balancing Redox Reactions
- Topic: redox reactions
- Replies: 5
- Views: 295
Re: redox reactions
oxidation half reaction would have the electrons in the products while the reduction half reaction would have the electrons in the reactants
- Mon Feb 03, 2020 11:00 am
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: q and w
- Replies: 10
- Views: 544
Re: q and w
q would be positive if heat is being added to the system and negative if heat is being removed. w would be positive if work is done by the system and negative if work is done on the system.
- Sun Feb 02, 2020 9:08 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reaction constant P
- Replies: 3
- Views: 81
Re: Reaction constant P
it is insignificant when it comes to solids and liquids because there is no change in volume for liquids and solids.
- Sun Feb 02, 2020 9:03 pm
- Forum: Calculating Work of Expansion
- Topic: Internal energy
- Replies: 5
- Views: 147
Re: Internal energy
U is the total energy of a closed system.
- Sun Feb 02, 2020 9:01 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Forming bonds
- Replies: 8
- Views: 179
Re: Forming bonds
When forming a bond, the system loses energy, and because of the decrease in energy, it must have been released, making it exothermic.
- Sun Feb 02, 2020 8:55 pm
- Forum: Phase Changes & Related Calculations
- Topic: Phase changes
- Replies: 3
- Views: 161
Re: Phase changes
depending on whether breaking or forming bonds is occurring, you can determine if it's endo or exo.
- Sun Feb 02, 2020 8:52 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Partial Pressure
- Replies: 7
- Views: 398
Re: Partial Pressure
partial pressure is a pressure exerted by an individual gas in a mixture
- Thu Jan 23, 2020 2:49 pm
- Forum: Phase Changes & Related Calculations
- Topic: Calories vs calories
- Replies: 5
- Views: 100
Re: Calories vs calories
1000 cal = 1 Cal. and for the nutrition facts, they use Cal which is kcal.
- Thu Jan 23, 2020 2:45 pm
- Forum: Ideal Gases
- Topic: Equilibrium Constant
- Replies: 7
- Views: 226
Re: Equilibrium Constant
because k is equal to [products] divided by [reactants], we know that we will end up with a low K value if the [reactant] > [products]. And therefore, there is more reactants
- Thu Jan 23, 2020 2:40 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Acids and Bases pka and pkb
- Replies: 8
- Views: 290
Re: Acids and Bases pka and pkb
a low pKa would indicate a strong acid whereas a low pKb would indicate a strong base
- Thu Jan 23, 2020 2:36 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ice table
- Replies: 13
- Views: 536
Re: ice table
no you do not include liquids and solids
- Thu Jan 23, 2020 2:33 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: pKa to Kb
- Replies: 12
- Views: 555
Re: pKa to Kb
pKa + pKb = 14, so solve for pKb. After finding pKb, use pKb = -log(kb) to find Kb
- Sun Jan 12, 2020 2:25 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Homogenous Equilibrium
- Replies: 13
- Views: 346
Re: Homogenous Equilibrium
homogenous equilibrium is when all reactants and all products are in the same phase
- Sun Dec 08, 2019 9:36 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: Hydrogen
- Replies: 3
- Views: 325
Re: Hydrogen
when there's a pair of unshared electrons on F-O-N or when there's a hydrogen that is bonded to F-O-N
- Sun Dec 08, 2019 9:32 am
- Forum: Lewis Structures
- Topic: hydrogen bonding
- Replies: 3
- Views: 334
Re: hydrogen bonding
where there is a pair of unshared electrons on F-O-N or where there is a hydrogen that is bonded to F-O-N
- Wed Dec 04, 2019 12:10 am
- Forum: Air Pollution & Acid Rain
- Topic: What do we need to know?
- Replies: 4
- Views: 367
Re: What do we need to know?
Because Dr. Lavelle mentioned it in lecture before, its safer to know it.
- Wed Dec 04, 2019 12:08 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strong vs Weak Acids and H atoms
- Replies: 2
- Views: 166
Re: Strong vs Weak Acids and H atoms
I do not think the amount of hydrogen atoms in the acid affects its strength.
- Wed Dec 04, 2019 12:01 am
- Forum: Bronsted Acids & Bases
- Topic: Homework Question
- Replies: 2
- Views: 222
Re: Homework Question
so basically in H2SO3, we know that it contains SO32- sulfite anion. so we can assume that H2SO3 will donate two protons
- Tue Dec 03, 2019 11:56 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: pH Sig Figs
- Replies: 4
- Views: 257
Re: pH Sig Figs
yes, the only thing that has no significance is anything to the left of the decimal point.
- Tue Dec 03, 2019 11:42 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: J.23
- Replies: 2
- Views: 155
Re: J.23
An easier way to remember them is to memorize carbonate and sulfate and then simply add an H which would reduces the charge by 1.
- Tue Dec 03, 2019 11:40 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Hw 6C19
- Replies: 3
- Views: 181
Re: Hw 6C19
One way to look at it would be to look at the electronegativity. Since Cl is more electronegative than P it would make HClO4 a stronger acid.
- Tue Dec 03, 2019 11:27 pm
- Forum: Lewis Acids & Bases
- Topic: 6A.13
- Replies: 5
- Views: 284
Re: 6A.13
because it's an electron-pair acceptor
- Tue Dec 03, 2019 11:26 pm
- Forum: Hybridization
- Topic: HW 2.47
- Replies: 1
- Views: 66
Re: HW 2.47
yeah they are the n values
- Tue Dec 03, 2019 11:23 pm
- Forum: Naming
- Topic: Memorization
- Replies: 6
- Views: 357
Re: Memorization
yeah i believe so
- Tue Dec 03, 2019 11:21 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: sigma and pi bonds
- Replies: 2
- Views: 253
Re: sigma and pi bonds
yeah single bonds have sigma, double have one sigma and one pi and triple bonds have one sigma and two pi
- Tue Dec 03, 2019 11:20 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Electronegativity and Acid Strength
- Replies: 3
- Views: 164
- Tue Dec 03, 2019 10:44 pm
- Forum: Ionic & Covalent Bonds
- Topic: polarity of shapes
- Replies: 3
- Views: 394
Re: polarity of shapes
only if they are symmetric and all the atoms attached to the central atom are the same; however, if the atoms attached to the central atom are not the same, then it is polar.
- Tue Dec 03, 2019 10:28 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 6B.3 (b)
- Replies: 3
- Views: 270
Re: 6B.3 (b)
Since HCl is a strong acid, then we know that it will 100% dissociate, which tells us that the moles of HCl must be equal to the moles of hydronium ions. So, we can use the volume and molarity given to calculate the moles of hydronium ions present. After calculating the number of moles, divide it by...
- Tue Dec 03, 2019 10:20 pm
- Forum: Bronsted Acids & Bases
- Topic: Acids and Bases
- Replies: 2
- Views: 125
Re: Acids and Bases
Acetic acid is a stronger acid because it is stabilized by resonance.
- Tue Dec 03, 2019 10:12 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Neutral or Negative Acid
- Replies: 2
- Views: 199
Re: Neutral or Negative Acid
the equation he gave was AH <--> A- + H+ and since the pH>pKa, the solution is more alkaline, and the acid will give off H+ to form A-. This basically meant that when AH dissociated, it formed A- which is negative so its negatively charged.
- Tue Dec 03, 2019 10:03 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 6C17 - strength of bases
- Replies: 4
- Views: 220
Re: 6C17 - strength of bases
morphine is basic because it contains a nitrogen with a lone pair. However, BrO- is a conjugate base of a weak acid, so its a stronger base.
- Tue Dec 03, 2019 9:52 pm
- Forum: Bronsted Acids & Bases
- Topic: J.9 calcium hydroxide and bromous acid
- Replies: 1
- Views: 260
Re: J.9 calcium hydroxide and bromous acid
the salt would be calcium bromide, Ca(BrO2)2
HBrO2 + Ca(OH)2 --> H2O + Ca(BrO2)2
HBrO2 + Ca(OH)2 --> H2O + Ca(BrO2)2
- Tue Dec 03, 2019 9:40 pm
- Forum: Bronsted Acids & Bases
- Topic: CaO
- Replies: 10
- Views: 1504
Re: CaO
It is considered a strong base because it completely dissociates when it is added to water.
- Tue Dec 03, 2019 9:38 pm
- Forum: Lewis Acids & Bases
- Topic: How to identify acid vs. base
- Replies: 4
- Views: 213
Re: How to identify acid vs. base
lewis acid is an electron-pair acceptor while a lewis base is an electron-pair donor.
- Tue Dec 03, 2019 9:36 pm
- Forum: Lewis Acids & Bases
- Topic: Naming Acids
- Replies: 3
- Views: 218
Re: Naming Acids
I think we should know the common ones, but maybe know them just in case
- Tue Dec 03, 2019 9:34 pm
- Forum: Bronsted Acids & Bases
- Topic: How to determine whether a molecule is an acid or a base
- Replies: 5
- Views: 302
Re: How to determine whether a molecule is an acid or a base
because nitrogen contains a lone pair
- Tue Dec 03, 2019 9:33 pm
- Forum: Student Social/Study Group
- Topic: Paramagnetic and Diamagnetic
- Replies: 2
- Views: 299
Re: Paramagnetic and Diamagnetic
I don't think we need to know this
- Tue Dec 03, 2019 12:01 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3000606
Re: Post All Chemistry Jokes Here
What did one charged atom say to the other?
I got my ion you!
I got my ion you!
- Tue Dec 03, 2019 12:00 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3000606
Re: Post All Chemistry Jokes Here
AU! THESE JOKES ARE GOLD, SO READ 'EM
- Mon Dec 02, 2019 10:13 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strong Acids
- Replies: 3
- Views: 206
Re: Strong Acids
yeah i think so just in case
- Mon Dec 02, 2019 9:47 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Today's lecture
- Replies: 5
- Views: 344
Re: Today's lecture
He talked about ions as acids and bases.
- Mon Dec 02, 2019 9:44 pm
- Forum: Lewis Acids & Bases
- Topic: Problem J.9
- Replies: 4
- Views: 163
Re: Problem J.9
it would produce water and potassium acetate.
CH3COOH + K(OH) → H2O + CH3COOK
CH3COOH + K(OH) → H2O + CH3COOK
- Mon Dec 02, 2019 9:39 pm
- Forum: Bronsted Acids & Bases
- Topic: stronger acid ?
- Replies: 8
- Views: 379
Re: stronger acid ?
HClO2 is a stronger acid than HBrO2 because Cl has a higher electronegativity than Br.
- Mon Dec 02, 2019 9:10 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Carbonate Ion
- Replies: 2
- Views: 112
Re: Carbonate Ion
This is due to carbonate's resonance and lewis structure. Because of its structure, there is 120 degrees between its oxygens so two oxygens can not bind to the same metal making it mono dentate. However, there are some cases where carbonate bonds to different metals which makes it bidentate.
- Mon Dec 02, 2019 9:02 pm
- Forum: Conjugate Acids & Bases
- Topic: What are some examples of basic oxides and acidic oxides?
- Replies: 2
- Views: 248
Re: What are some examples of basic oxides and acidic oxides?
Some acidic oxides include SO2, CO2, NO2, ClO2 and some basic oxides include CaO and BaO
- Mon Dec 02, 2019 8:44 pm
- Forum: Amphoteric Compounds
- Topic: Oxides
- Replies: 1
- Views: 105
Re: Oxides
When the oxide is added to water and it forms an acid, then it is an acidic oxide. When an oxide is added to water and forms a base, then it is a basic oxide. And when an oxide is added to water and has the ability to form both an acid and base, then it is amphoteric.
- Mon Dec 02, 2019 8:41 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pH sigfigs
- Replies: 3
- Views: 113
Re: pH sigfigs
The numbers to the left of the decimal point of the pH has no significance, so for example, a pH of 4.22 would correspond to a concentration that only has two sig figs and not three.
- Mon Dec 02, 2019 8:37 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pH and pKa
- Replies: 2
- Views: 240
Re: pH and pKa
AH <--> A- + H+
since the pH>pKa, the solution is more alkaline, and the acid will give off H+ to form A-. Therefore, it is negatively charged.
since the pH>pKa, the solution is more alkaline, and the acid will give off H+ to form A-. Therefore, it is negatively charged.
- Mon Dec 02, 2019 8:32 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Outline topic
- Replies: 2
- Views: 173
Re: Outline topic
At the same concentration, weak acids have a higher pH than strong acids because weak acids partially dissociate whereas strong acids fully dissociate. therefore, strong acids have a higher hydronium concentration, and the higher the hydronium concentration, the lower the pH.
- Mon Dec 02, 2019 8:26 pm
- Forum: Bronsted Acids & Bases
- Topic: Oxoacids
- Replies: 2
- Views: 207
Re: Oxoacids
it's any acid that contains oxygen bonded to a hydrogen atom and one or more other elements.
- Mon Dec 02, 2019 8:13 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Conjugate Seesaw [ENDORSED]
- Replies: 2
- Views: 244
Re: Conjugate Seesaw [ENDORSED]
i think all you need to know is that the stronger the acid is, the weaker its conjugate base. and the stronger the base is, the weaker its conjugate acid is.
- Sat Nov 30, 2019 3:10 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: Textbook question 6C.21
- Replies: 1
- Views: 104
Re: Textbook question 6C.21
When we look at the conjugate bases for these two acids, the only difference is that there's a methyl group attached adjacent to the carbonyl group in the conjugate base for acetic acid while the conjugate base for formic acid only has a hydrogen attached adjacent to the carbonyl group. The methyl g...
- Sat Nov 30, 2019 3:01 pm
- Forum: Student Social/Study Group
- Topic: Final Exam
- Replies: 3
- Views: 165
Re: Final Exam
12/8/2019 and three hours long
- Sat Nov 30, 2019 2:45 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: 6B.3
- Replies: 2
- Views: 213
Re: 6B.3
Since HCl is a strong acid, then we know that it will 100% dissociate, which tells us that the moles of HCl must be equal to the moles of hydronium ions. So, we can use the volume and molarity given to calculate the moles of hydronium ions present. After calculating the number of moles, divide it by...
- Sat Nov 30, 2019 2:25 pm
- Forum: Properties & Structures of Inorganic & Organic Bases
- Topic: 6C.17
- Replies: 1
- Views: 154
Re: 6C.17
Hypobromite ion, BrO-, is a conjugate base of a weak acid, and therefore it must be a strong base. Morphine, C17H19O3N, has a lone pair located on the nitrogen, so it's a weaker base.
- Mon Oct 14, 2019 9:42 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: 1A.11 What is common to each series that groups their spectral lines together?
- Replies: 2
- Views: 75
Re: 1A.11 What is common to each series that groups their spectral lines together?
The common aspect in each series is that the energy levels from which an electron starts or returns to is the same for anything in that series. For example, in the Balmer series, the electrons always return from or start from the energy level n=2. Same goes for the Lyman series, where e- start or re...
- Mon Oct 14, 2019 9:36 am
- Forum: Properties of Light
- Topic: 1A.15
- Replies: 4
- Views: 196
Re: 1A.15
Because the emission is ultraviolet, then we know that this transition is happening in the Lyman series. So the final energy level is going to be n=1. The initial energy level could be anything greater than 1. You can then use Rydberg's equation to find n1.
- Mon Oct 14, 2019 9:24 am
- Forum: Properties of Electrons
- Topic: 1F.5 Question
- Replies: 2
- Views: 121
Re: 1F.5 Question
Yes, you would be able to use a periodic table. So ionization energy increases going up a periodic table and increases going left to right.
- Mon Oct 14, 2019 9:17 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Positive & Negative Signs on Energy Levels
- Replies: 2
- Views: 159
Re: Positive & Negative Signs on Energy Levels
The negative sign of energy just means that the electron of that atom has a lower energy than the free electron which is zero energy.
- Mon Oct 14, 2019 9:03 am
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Are these equations only specific to H-atoms?
- Replies: 2
- Views: 150
Re: Are these equations only specific to H-atoms?
For the bohr frequency condition, the equation contains Rydberg's constant (3.29x10^15 Hz); and that constant only works on hydrogen atoms or hydrogen-like atoms such as He+.
- Sat Oct 05, 2019 12:07 am
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron configuration order
- Replies: 4
- Views: 242
Re: Electron configuration order
I agree with the commenter before me. The position of the 3d orbital is at a higher level than the 4s orbital; therefore, the 4s orbital would fill up before the the 3d orbital.
- Sat Oct 05, 2019 12:02 am
- Forum: Administrative Questions and Class Announcements
- Topic: Frequency of posting
- Replies: 2
- Views: 118
Re: Frequency of posting
I think they are due on Sunday not sure though
- Fri Oct 04, 2019 11:30 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: G23
- Replies: 2
- Views: 179
Re: G23
I got a concentration of 0.13 M of chloride ions. I do not think it matters because when both of these compounds dissociate the mole ratio between the compound and Cl- is 1:1. For example, 1 mole of sodium chloride would dissociate to 1 mole of Na+ and 1 mole of Cl-, so there's no need to separate t...