Search found 103 matches
- Fri Mar 13, 2020 10:08 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Slow Step Determination
- Replies: 5
- Views: 383
Re: Slow Step Determination
I'm pretty sure it should be given
- Fri Mar 13, 2020 10:08 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Identification
- Replies: 8
- Views: 545
Re: Identification
I think you just have to know if it's pure or not
- Fri Mar 13, 2020 10:06 pm
- Forum: Administrative Questions and Class Announcements
- Topic: take home FINAL DEADLINE
- Replies: 15
- Views: 1134
Re: take home FINAL DEADLINE
He hasn't explicitly stated when we need to submit the final yet
- Fri Mar 13, 2020 10:04 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts
- Replies: 5
- Views: 392
Re: Catalysts
It means the catalyst is not consumed during the reaction
- Fri Mar 13, 2020 10:03 pm
- Forum: General Rate Laws
- Topic: Temperature and kinetics
- Replies: 5
- Views: 423
Re: Temperature and kinetics
Yes at higher temperatures, molecules have higher kinetic energy
- Fri Mar 13, 2020 10:02 pm
- Forum: First Order Reactions
- Topic: Units for t
- Replies: 30
- Views: 1318
Re: Units for t
The SI units for time is seconds
- Fri Mar 13, 2020 10:01 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Delta S total
- Replies: 6
- Views: 377
Re: Delta S total
The total entropy is the entropy of the surroundings plus the entropy of the system
- Fri Mar 13, 2020 10:00 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts
- Replies: 3
- Views: 307
Re: Catalysts
I think different types of catalysts use different methods to lower the activation energy
- Fri Mar 13, 2020 9:58 pm
- Forum: Zero Order Reactions
- Topic: Catalyst
- Replies: 4
- Views: 453
Re: Catalyst
No a zero order reaction won't be influenced by a catalyst
- Fri Mar 13, 2020 9:56 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: 6.45
- Replies: 3
- Views: 304
Re: 6.45
The reduction table in the back of the book shows you which metals will be reduced
- Fri Mar 13, 2020 9:54 pm
- Forum: General Rate Laws
- Topic: Instantaneous Rate
- Replies: 2
- Views: 228
Re: Instantaneous Rate
The instantaneous rate is the rate at any given time, the rate is given by the tangent line at that time
- Fri Mar 13, 2020 9:52 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidation number
- Replies: 12
- Views: 1241
Re: Oxidation number
The oxidation number change in a chemical reaction show what is being reduced and oxidized
- Wed Mar 11, 2020 4:41 pm
- Forum: First Order Reactions
- Topic: rate constants
- Replies: 30
- Views: 1537
Re: rate constants
the rate constant is always positive
- Wed Mar 11, 2020 4:39 pm
- Forum: General Rate Laws
- Topic: Rate limiting step
- Replies: 13
- Views: 798
Re: Rate limiting step
it's the slowest step in a reaction
- Wed Mar 11, 2020 4:38 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: finding k
- Replies: 3
- Views: 258
Re: finding k
You'll likely need to be given the rate law or experimental data
- Wed Mar 11, 2020 4:37 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Change in Ecell
- Replies: 5
- Views: 345
Re: Change in Ecell
Increasing the size of the metal does not change the cell potential
- Wed Mar 11, 2020 4:36 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: dilutions and Ecell
- Replies: 16
- Views: 3385
Re: dilutions and Ecell
If it's a cathode solution (like on test 2) then diluting it will decrease cell potential
- Wed Mar 11, 2020 4:34 pm
- Forum: *Enzyme Kinetics
- Topic: Do we need to know enzyme kinetics for the final? [ENDORSED]
- Replies: 4
- Views: 911
Re: Do we need to know enzyme kinetics for the final? [ENDORSED]
You should know that enzymes can act as catalysts
- Wed Mar 11, 2020 4:32 pm
- Forum: General Rate Laws
- Topic: 7A.3
- Replies: 5
- Views: 412
Re: 7A.3
0.44 is not the rate constant but the actual rate so you would multiply the number of oxygen's by 0.44
- Mon Mar 09, 2020 3:50 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: purpose
- Replies: 4
- Views: 368
Re: purpose
It relates the rate constant k to activation energy Ae and temperature T
- Mon Mar 09, 2020 3:47 pm
- Forum: General Rate Laws
- Topic: overall order
- Replies: 5
- Views: 462
Re: overall order
You'll have to find the order of the individual reactants then add them up
- Mon Mar 09, 2020 3:46 pm
- Forum: Second Order Reactions
- Topic: linear graph
- Replies: 7
- Views: 554
Re: linear graph
1/[A] vs time
- Mon Mar 09, 2020 3:45 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Slow Step
- Replies: 4
- Views: 345
Re: Slow Step
You will most likely not need to determine which step is the slow step
- Mon Mar 09, 2020 3:45 pm
- Forum: General Science Questions
- Topic: Test 2 Grades [ENDORSED]
- Replies: 23
- Views: 1639
Re: Test 2 Grades [ENDORSED]
Probably during dicussion
- Mon Mar 09, 2020 3:44 pm
- Forum: General Rate Laws
- Topic: 7A3
- Replies: 2
- Views: 287
Re: 7A3
Since the equation has 3 moles of O2 on the reactant side, the rate at which oxygen reacts will be 3 times the rate of reaction
Similarly, since the equation has 2moles of H2O on the product side, the rate at which water forms will be 2 times the rate of reaction
Similarly, since the equation has 2moles of H2O on the product side, the rate at which water forms will be 2 times the rate of reaction
- Mon Mar 09, 2020 3:42 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: k'
- Replies: 6
- Views: 439
Re: k'
it is the rate constant of the reverse reaction
- Mon Feb 10, 2020 4:59 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Isothermal
- Replies: 9
- Views: 546
Re: Isothermal
Isothermal systems have constant temperature, this does not mean the same as reversible
- Mon Feb 10, 2020 4:52 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: spontaneity
- Replies: 18
- Views: 744
Re: spontaneity
if delta G is negative the reaction is spontaneous
- Mon Feb 10, 2020 4:49 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneous delta G
- Replies: 7
- Views: 440
Re: Spontaneous delta G
finding the temperature at delta G=0 gives the minimum temperature for the reaction to be spontaneous
- Mon Feb 10, 2020 4:41 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: qp=deltaH
- Replies: 6
- Views: 374
Re: qp=deltaH
q = deltaH at constant pressure
- Mon Feb 10, 2020 4:40 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: q=mCdeltaT vs q=nCdeltaT
- Replies: 2
- Views: 111
Re: q=mCdeltaT vs q=nCdeltaT
use q=mCdeltaT when you're given the mass and use q=nCdeltaT when you're given the moles
- Sun Feb 02, 2020 8:33 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Positive or negative work?
- Replies: 8
- Views: 311
Re: Positive or negative work?
If work is done on the system it is positive, if the system is doing work its surroundings work is negative
- Sun Feb 02, 2020 8:31 pm
- Forum: Ideal Gases
- Topic: PV=nRT
- Replies: 74
- Views: 4841
Re: PV=nRT
P is pressure, V is volume, n is # of moles of gas, R is the gas constant, T is temperature
- Sun Feb 02, 2020 8:29 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Temperature
- Replies: 14
- Views: 574
Re: Temperature
Exothermic
- Sun Feb 02, 2020 8:28 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Pressure in an open beaker
- Replies: 12
- Views: 806
Re: Pressure in an open beaker
Pressure in an open beaker is always constant since there isn't a volume to drop or increase pressure
- Sun Feb 02, 2020 8:28 pm
- Forum: General Science Questions
- Topic: Extra Credit
- Replies: 19
- Views: 838
Re: Extra Credit
I don't think so.
- Mon Jan 27, 2020 3:08 am
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Exothermic reaction
- Replies: 18
- Views: 740
Re: Exothermic reaction
if temp increases then the reaction will shift to the left, if temp decreases then the reaction will shift to the right
- Mon Jan 27, 2020 3:07 am
- Forum: Administrative Questions and Class Announcements
- Topic: Grading of Tests
- Replies: 18
- Views: 773
Re: Grading of Tests
I believe they'll give partial credit if you use the right steps
- Mon Jan 27, 2020 3:06 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: pKa to Kb
- Replies: 12
- Views: 660
Re: pKa to Kb
pKa + pKb = 14, then use pKb to solve for Kb
- Mon Jan 27, 2020 3:05 am
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Reaction Shifts Left or Right
- Replies: 15
- Views: 607
Re: Reaction Shifts Left or Right
the reaction will shift left
- Mon Jan 27, 2020 3:04 am
- Forum: Administrative Questions and Class Announcements
- Topic: homework for week 4
- Replies: 11
- Views: 431
Re: homework for week 4
I'm pretty sure the thermodynamics section
- Sun Jan 19, 2020 9:12 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: pKa
- Replies: 13
- Views: 509
Re: pKa
A stronger acid will have a lower pKa
- Sun Jan 19, 2020 9:12 pm
- Forum: General Science Questions
- Topic: test 1
- Replies: 8
- Views: 323
Re: test 1
The test is during your discussion session on week 3
- Sun Jan 19, 2020 9:09 pm
- Forum: General Science Questions
- Topic: Acids
- Replies: 3
- Views: 157
Re: Acids
Lewis acids are proton acceptors while Bronsted acids are proton donors
- Sun Jan 19, 2020 9:08 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle
- Replies: 7
- Views: 204
Re: Le Chatelier's Principle
It helps us predict how a reaction will react when a physical change occurs
- Sun Jan 19, 2020 9:05 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Relationship between pressure and volume
- Replies: 10
- Views: 433
Re: Relationship between pressure and volume
Yes they're inversely proportional
- Sun Jan 12, 2020 9:18 pm
- Forum: Ideal Gases
- Topic: P=(n/v)RT
- Replies: 12
- Views: 1037
Re: P=(n/v)RT
Writing (n/V)RT is the same as nRT/V
- Sun Jan 12, 2020 9:16 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Q>K
- Replies: 9
- Views: 310
Re: Q>K
If the ratio of products to reactants is larger than that of the equilibrium constant, then Q>K
- Sun Jan 12, 2020 9:09 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Calculating Q
- Replies: 16
- Views: 793
Re: Calculating Q
Since the activity of solids and liquids are equal to 1, they aren't included in the calculation of Q and K, this leaves only gases and aqueous substances
- Sun Jan 12, 2020 9:04 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Concentration
- Replies: 5
- Views: 150
Re: Concentration
If all other conditions remain the same, the equilibrium constant won't change
- Sun Jan 12, 2020 9:02 pm
- Forum: Ideal Gases
- Topic: ICE Table
- Replies: 9
- Views: 521
Re: ICE Table
If the forward reaction is favored, then reactants will have a negative change and products will have a negative change, and vice versa when the reverse reaction is favored
Re: Chelating
If it has the structure binding site-spacer-spacer-binding site then it is typically chelating
- Sun Dec 08, 2019 6:47 pm
- Forum: Octet Exceptions
- Topic: Octet exception
- Replies: 14
- Views: 1295
Re: Octet exception
Elements with the third energy shell and on since the d-orbital can also have electrons
Re: -ate
You don't need to add anything for positive ions or neutral molecules
- Sun Dec 08, 2019 6:44 pm
- Forum: Amphoteric Compounds
- Topic: Amphiprotic
- Replies: 7
- Views: 555
Re: Amphiprotic
they can act as both an acid and a base
- Sun Dec 08, 2019 6:44 pm
- Forum: Hybridization
- Topic: double and triple bonds
- Replies: 6
- Views: 527
Re: double and triple bonds
pi bonds in double and triple bonds don't hybridize
- Sun Dec 01, 2019 6:22 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: 6C.19
- Replies: 1
- Views: 92
Re: 6C.19
HNO3 is stronger since it’s conjugate base NO3- is more stable than the conjugate base of HNO2
- Sun Dec 01, 2019 6:19 pm
- Forum: Bronsted Acids & Bases
- Topic: Conjugate acids and bases
- Replies: 5
- Views: 488
Re: Conjugate acids and bases
Conjugate acids are bronsted bases with an H+
Conjugate vases are bronsted acids without an H+
Conjugate vases are bronsted acids without an H+
- Sun Dec 01, 2019 6:12 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Drawing sigma & Pi bonds
- Replies: 7
- Views: 640
Re: Drawing sigma & Pi bonds
You can represent end to end by drawing 2 infinity signs next to each other and represent side to side by drawing two 8’s next to each other
- Sun Dec 01, 2019 6:05 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: pH calcuations
- Replies: 8
- Views: 475
Re: pH calcuations
I believe so
- Sun Dec 01, 2019 6:03 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: H2SO4
- Replies: 2
- Views: 219
Re: H2SO4
Yes the concentration of H+ would be double that of H2SO4
Re: Order
The transition metal cation comes before the anion
- Sun Nov 24, 2019 3:49 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Focus 9C.1 and 9C.2
- Replies: 2
- Views: 155
Re: Focus 9C.1 and 9C.2
9C.1: Coordination Complexes
9C.2: The Shapes of Complexes
9C.2: The Shapes of Complexes
- Fri Nov 22, 2019 1:12 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: name?
- Replies: 4
- Views: 228
Re: name?
chrisleung wrote:Yes, they are two names for the same geometry, for molecules with configuration AX2E or AX3E
AX3E would be trigonal pyramidal, AX2E2 would be bent
- Fri Nov 22, 2019 1:08 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
- Replies: 9
- Views: 502
Re: london forces
The larger molecule will have stronger London forces
- Fri Nov 22, 2019 1:07 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: NO Shape and Polarity
- Replies: 4
- Views: 309
Re: NO Shape and Polarity
NO is linear, I think it's slightly polar
- Mon Nov 18, 2019 12:36 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: pentagonal bipyramidal 3 lone pairs?
- Replies: 2
- Views: 225
Re: pentagonal bipyramidal 3 lone pairs?
I don't think we would need to know this as it's either super uncommon or not possible
- Mon Nov 18, 2019 12:31 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: NH2OH
- Replies: 1
- Views: 185
Re: NH2OH
it would be between the oxygen atoms of one molecule and the hydrogen of another
- Mon Nov 18, 2019 12:28 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: CH2Cl2
- Replies: 1
- Views: 173
Re: CH2Cl2
since the C-H bonds and C-Cl bonds have differing polarities, the molecule will be polar and will have dipole-dipole interactions
- Mon Nov 18, 2019 12:26 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: H2SeO4
- Replies: 1
- Views: 199
Re: H2SeO4
the dipole between O-H bonds will cause the H to be slightly negative, while the dipole between the Se-O bonds will make the O slightly positive, this causes the H atoms of one molecule to be attracted to the O atoms of another, creating dipole-dipole interactions
- Mon Nov 18, 2019 12:21 am
- Forum: Dipole Moments
- Topic: Intermolecular Forces
- Replies: 1
- Views: 80
Re: Intermolecular Forces
London, Dipole-dipole, dipole-induced dipole, ion-dipole, h-bondings, ion-induced dipole
- Sun Nov 10, 2019 6:47 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: dipole moment and intermolecular forces
- Replies: 3
- Views: 198
Re: dipole moment and intermolecular forces
Dipole moments cause parts of a molecule to be charged, this leads to positively charged parts of one molecule being attracted to negatively charged parts of another, leading to intermolecular forces.
- Sun Nov 10, 2019 6:45 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 vs. dipole-induced-dipole interaction
- Replies: 3
- Views: 137
Re: London vs. dipole-induced-dipole interaction
I think they're the same thing
- Sun Nov 10, 2019 6:44 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: 3F.3 hw prob
- Replies: 1
- Views: 85
Re: 3F.3 hw prob
CH4 and CCl4 won't have dipole-dipole interactions since they don't have permanent dipole moments
- Sun Nov 10, 2019 6:41 am
- Forum: Dipole Moments
- Topic: Dipole Moments
- Replies: 3
- Views: 212
Re: Dipole Moments
dipole moments occur when electrons are unequally shared, this can affect intermolecular forces as it makes parts of the molecule positively/negatively charged
- Sun Nov 10, 2019 6:39 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: 3F.1 hw prob
- Replies: 1
- Views: 79
Re: 3F.1 hw prob
Look at the difference in electronegativity between atoms and look for cases of hydrogen bonding
- Sat Nov 02, 2019 6:59 pm
- Forum: Lewis Structures
- Topic: 2B. 9
- Replies: 3
- Views: 233
Re: 2B. 9
It shows that they're bonded through ionic bonds rather than covalent bonds
- Sat Nov 02, 2019 6:56 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2A.3
- Replies: 1
- Views: 172
Re: 2A.3
a) [Ar]
b) [Ar]3d^10 4s^2
c) [Kr]4d^5
d) [Ar]3d^10 4s^2
b) [Ar]3d^10 4s^2
c) [Kr]4d^5
d) [Ar]3d^10 4s^2
- Sat Nov 02, 2019 6:55 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2A.5
- Replies: 1
- Views: 104
Re: 2A.5
a) [Ar]3d^10
b) [Xe]4f^14 5d^10 6s^2
c) [Ar]3d^10;
d) [Xe]4f^14 5d^10
b) [Xe]4f^14 5d^10 6s^2
c) [Ar]3d^10;
d) [Xe]4f^14 5d^10
- Sat Nov 02, 2019 6:52 pm
- Forum: Resonance Structures
- Topic: Textbook question 2B.15
- Replies: 1
- Views: 81
Re: Textbook question 2B.15
N can't be double bonded to Cl since Cl is a halogen and halogens don't form double bonds
- Sat Nov 02, 2019 6:48 pm
- Forum: Lewis Structures
- Topic: 2B. 3 part d
- Replies: 4
- Views: 267
Re: 2B. 3 part d
Br has three bonds (one with each F) and two pairs of lone electrons, while the F's have 3 pairs of lone electrons
- Sun Oct 27, 2019 9:33 pm
- Forum: Lewis Structures
- Topic: VSEPR: E in AXE
- Replies: 2
- Views: 118
Re: VSEPR: E in AXE
E represents lone pairs on the central atom
- Sun Oct 27, 2019 9:31 pm
- Forum: Sigma & Pi Bonds
- Topic: Single vs. Double bonds
- Replies: 15
- Views: 1963
Re: Single vs. Double bonds
Since double bonds are stronger, they pull the atoms closer together and are therefore shorter.
- Sun Oct 27, 2019 9:29 pm
- Forum: Lewis Structures
- Topic: 2C.7
- Replies: 2
- Views: 101
Re: 2C.7
a.2 bonding pairs, 2 lone pairs
b.2 bonding pairs, 4 lone pairs
c.3 bonding pairs, 2 lone pairs
d.5 bonding pairs, 1 lone pair
b.2 bonding pairs, 4 lone pairs
c.3 bonding pairs, 2 lone pairs
d.5 bonding pairs, 1 lone pair
- Sun Oct 27, 2019 9:25 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2A.23
- Replies: 2
- Views: 118
Re: 2A.23
a.Mg3As2
b.In2S3
c.AlH3
d.H2Te
e.BiF3
b.In2S3
c.AlH3
d.H2Te
e.BiF3
- Sun Oct 27, 2019 9:21 pm
- Forum: Ionic & Covalent Bonds
- Topic: 2A.21
- Replies: 4
- Views: 177
Re: 2A.21
a.[Ar]
b.[Kr]5s^2 4d^10
c.[Xe]
d.[Ar]3d^8
no unpaired electrons for all
b.[Kr]5s^2 4d^10
c.[Xe]
d.[Ar]3d^8
no unpaired electrons for all
- Sat Oct 19, 2019 9:31 pm
- Forum: Photoelectric Effect
- Topic: E = pc vs E= mv^2/2
- Replies: 2
- Views: 94
Re: E = pc vs E= mv^2/2
E=pc=mc^2 only applies to em radiation
E=mv^2/2 is used for kinetic energy of an object
E=mv^2/2 is used for kinetic energy of an object
- Sat Oct 19, 2019 7:53 pm
- Forum: Properties of Electrons
- Topic: Electron structures
- Replies: 4
- Views: 348
Re: Electron structures
Electrons are paired if they're in the same orbital and parallel if they're in separate orbitals and have the same spin
- Sat Oct 19, 2019 3:00 pm
- Forum: DeBroglie Equation
- Topic: 1B. 19 Homework Help
- Replies: 1
- Views: 96
Re: 1B. 19 Homework Help
I used the ones from the chem website
Mass of neutron = 1.674 927 × 10^−27 kg
Mass of proton = 1.672 622 × 10^−27 kg
Mass of neutron = 1.674 927 × 10^−27 kg
Mass of proton = 1.672 622 × 10^−27 kg
- Sat Oct 19, 2019 2:58 pm
- Forum: General Science Questions
- Topic: Midterm
- Replies: 12
- Views: 505
Re: Midterm
6 – 8pm, Wednesday November 6
- Sat Oct 19, 2019 2:55 pm
- Forum: Einstein Equation
- Topic: Focus 1B.5 Homework.. Electron Volts
- Replies: 2
- Views: 155
Re: Focus 1B.5 Homework.. Electron Volts
1 eV = 1.602 × 10^-19 J
- Sat Oct 12, 2019 3:47 pm
- Forum: DeBroglie Equation
- Topic: Wave Properties of Electrons and the De Broglie Equation Post-Module Assessment
- Replies: 1
- Views: 99
Re: Wave Properties of Electrons and the De Broglie Equation Post-Module Assessment
wavelength = h/(mv)
if wavelength is shorter than 10^-15m it is undetectable
if wavelength is shorter than 10^-15m it is undetectable
- Sat Oct 12, 2019 3:40 pm
- Forum: Properties of Light
- Topic: Wavelength
- Replies: 4
- Views: 181
Re: Wavelength
since the speed of light is always the same c = 3.0*10^8 and c=wavelength * frequency, as wavelength decreases frequency must increase and the same idea applies to energy since frequency and energy are directly related
- Sat Oct 12, 2019 3:29 pm
- Forum: Properties of Light
- Topic: Homework B9
- Replies: 1
- Views: 90
Re: Homework B9
find number of joules from the light
32J/s * 2.0s = 64J
then divide joules by the energy per photon
64J/(4.7*10^-19) = 1.4*10^20
finally divide by Avogadro's #
1.4*10^20/(6.022*10^23) = 2.3*10^-4 mol photon
32J/s * 2.0s = 64J
then divide joules by the energy per photon
64J/(4.7*10^-19) = 1.4*10^20
finally divide by Avogadro's #
1.4*10^20/(6.022*10^23) = 2.3*10^-4 mol photon
- Sat Oct 12, 2019 3:19 pm
- Forum: Properties of Electrons
- Topic: Speed of an Electron
- Replies: 3
- Views: 226
Re: Speed of an Electron
I think it's reasonable as long as it's lower than the speed of light
- Sat Oct 12, 2019 3:16 pm
- Forum: Properties of Light
- Topic: Textbook 1B.15
- Replies: 1
- Views: 85
Re: Textbook 1B.15
E(photon)=1.66*10^-17+KE(electron)= 1.66*10^-17J + 0.5 * (9.11*10^-31kg) * (3.6*10^6m/s)^2 = 2.25*10^-17J
then you can use the energy of the photon to find the wavelength using E=hv
then you can use the energy of the photon to find the wavelength using E=hv
- Sun Oct 06, 2019 1:49 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Preparing solutions
- Replies: 1
- Views: 88
Re: Preparing solutions
I don't think so
- Thu Oct 03, 2019 4:59 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Lab experiments- accuracy vs precision
- Replies: 7
- Views: 638
Re: Lab experiments- accuracy vs precision
If your experiment is inaccurate yet precise it may indicate that there is a problem with the devices/methods you are using to conduct your experiment
- Thu Oct 03, 2019 4:57 pm
- Forum: Limiting Reactant Calculations
- Topic: Fundamentals M.17
- Replies: 6
- Views: 407
Re: Fundamentals M.17
Darren Nguyen 1F wrote:Samuel Tzeng 1H wrote:Molar mass of XA = total mass - mass of H2O
How do I get total mass?
It's the molar mass of HA + XOH = (250+125)
Sorry I meant total molar mass - molar mass of H2O
- Thu Oct 03, 2019 4:53 pm
- Forum: Balancing Chemical Reactions
- Topic: Fundamentals L39
- Replies: 2
- Views: 146
Re: Fundamentals L39
Start off by finding moles of tin and oxygen
Sn: 1.50g Sn / 118.71g/mol = .01264 mol Sn
O: (28.35g - 26.45g - 1.50g) / 16.00g/mol = 0.025 mol O
With this you can tell the empirical formula is SnO2
The oxide would be Tin(IV) Oxide since each oxygen has a -2 charge so the tin must have a +4 charge
Sn: 1.50g Sn / 118.71g/mol = .01264 mol Sn
O: (28.35g - 26.45g - 1.50g) / 16.00g/mol = 0.025 mol O
With this you can tell the empirical formula is SnO2
The oxide would be Tin(IV) Oxide since each oxygen has a -2 charge so the tin must have a +4 charge