Search found 62 matches
- Sat Mar 16, 2019 11:10 am
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 413034
Re: Advice from a Medical Student [ENDORSED]
Thank you!!!
- Sat Mar 16, 2019 11:07 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation Energy
- Replies: 2
- Views: 364
Re: Activation Energy
What affects or changes the Activation Energy?
- Sat Mar 16, 2019 11:06 am
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Activation Energy
- Replies: 2
- Views: 364
Activation Energy
In the Arrhenius Equation, what does the A stand for? What is that?
- Sat Mar 16, 2019 10:54 am
- Forum: Student Social/Study Group
- Topic: Lyndon's Review Sess
- Replies: 6
- Views: 1117
Re: Lyndon's Review Sess
I can't find it.
- Fri Mar 15, 2019 8:05 pm
- Forum: Student Social/Study Group
- Topic: Studying for the Final
- Replies: 25
- Views: 2815
Re: Studying for the Final
It says he will post it 9 am tomorrow morning.
- Sun Mar 10, 2019 8:16 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: delta G
- Replies: 5
- Views: 719
Re: delta G
How is a photosynthesis reaction exergonic?
- Sun Mar 10, 2019 8:15 pm
- Forum: First Order Reactions
- Topic: first order reactions examples
- Replies: 3
- Views: 406
Re: first order reactions examples
How do you know if it's a first order reaction?
- Sun Mar 10, 2019 8:13 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Final Exam
- Replies: 23
- Views: 1815
Re: Final Exam
Do you know when Lyndon will post his final review worksheet?
- Sun Mar 03, 2019 6:25 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3610225
Re: Post All Chemistry Jokes Here
Q: What do you do with a sick chemist?
A: If you can't helium, and you can't curium, then you might as well barium.
A: If you can't helium, and you can't curium, then you might as well barium.
- Sun Mar 03, 2019 6:22 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Kinetics HW help
- Replies: 1
- Views: 257
Kinetics HW help
Can someone help me on number 27 from the 6th edition?
- Sun Mar 03, 2019 6:19 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Kinetics
- Replies: 7
- Views: 769
Re: Kinetics
What does it mean if Kinetics is controlling a reaction?
- Sat Feb 23, 2019 11:02 pm
- Forum: Balancing Redox Reactions
- Topic: H OH and H20
- Replies: 2
- Views: 298
Re: H OH and H20
Then when do you use OH-?
- Sat Feb 23, 2019 11:01 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic Cell Diagram
- Replies: 3
- Views: 414
Re: Galvanic Cell Diagram
Yeah I would just be familiar with it just in case.
- Sat Feb 23, 2019 5:03 pm
- Forum: Balancing Redox Reactions
- Topic: HW help
- Replies: 1
- Views: 221
HW help
Can someone help me on 14.5 on the 6th edition? I don't get how or where to add H2O to the equation.
- Wed Feb 13, 2019 11:53 pm
- Forum: Phase Changes & Related Calculations
- Topic: ΔH vs ΔU?
- Replies: 8
- Views: 1397
Re: ΔH vs ΔU?
If enthalpy is given do we automatically assume the reaction is at constant pressure.
- Wed Feb 13, 2019 11:52 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible Reactions
- Replies: 8
- Views: 1325
Re: Reversible Reactions
All isothermal reactions have delta U=0 and all constant pressure w=0.
- Wed Feb 13, 2019 1:51 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
- Replies: 179
- Views: 23860
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sun 7-9PM (Karen)
Is there answer where it shows the work for these worksheets.
- Sat Feb 09, 2019 3:24 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: delta H
- Replies: 3
- Views: 462
Re: delta H
How do you find delta H.
- Sat Feb 09, 2019 2:27 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Reversible Exapansion
- Replies: 2
- Views: 289
Reversible Exapansion
What is reversible and irreversible expansion can some explain this to me.
- Sat Feb 09, 2019 2:20 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: midterm [ENDORSED]
- Replies: 4
- Views: 557
Re: midterm [ENDORSED]
When is Lyndon going to post his midterm review ws??
- Sun Feb 03, 2019 5:44 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Spontaneity of Exo and Endo reactions
- Replies: 4
- Views: 930
Re: Spontaneity of Exo and Endo reactions
Why aren't all exothermic reaction spontaneous?
- Sun Feb 03, 2019 5:43 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: MIDTERM MATERIAL QUESTION
- Replies: 2
- Views: 311
Re: MIDTERM MATERIAL QUESTION
Look at the outlines posted on his website it tells what chapters do need to know.
- Sun Feb 03, 2019 5:43 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: constant pressure/volume vs specific/molar heat capacities
- Replies: 4
- Views: 419
Re: constant pressure/volume vs specific/molar heat capacities
Why do we have to use integrals to find constant pressure?
- Sat Jan 26, 2019 10:29 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy Units
- Replies: 7
- Views: 762
Re: Enthalpy Units
What is the standard enthalpy of formation?
- Sat Jan 26, 2019 10:27 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: states of reactants and products
- Replies: 3
- Views: 381
Re: states of reactants and products
In the lecture, he said that since reactants and product can be different states and reactions can occur at different pressure, the enthalpy of a reaction can be different.
- Sat Jan 26, 2019 10:24 pm
- Forum: Phase Changes & Related Calculations
- Topic: Enthalpy signs
- Replies: 13
- Views: 1721
Re: Enthalpy signs
What is state property and what does it mean when enthalpy is state property.
- Sat Jan 19, 2019 6:38 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 10^-3 as a comparison
- Replies: 2
- Views: 147
Re: 10^-3 as a comparison
so if it is <10^-3 you take out the x in the denominator
- Sat Jan 19, 2019 6:34 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Partial Pressure and Moles
- Replies: 3
- Views: 456
Re: Partial Pressure and Moles
Can you make an ICE table for partial pressure or is just used for concentration?
- Tue Jan 15, 2019 9:10 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: HW 6B.11 7th Ed
- Replies: 1
- Views: 214
Re: HW 6B.11 7th Ed
Can someone help me with 11.41 from 6th edition
- Sat Jan 12, 2019 10:48 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Understanding Q
- Replies: 3
- Views: 322
Re: Understanding Q
What is quotient and what is the difference between quotient and K if they are calculated the same way.
- Sat Jan 12, 2019 10:45 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: pressure and temperature
- Replies: 4
- Views: 205
Re: pressure and temperature
Does temperature change or affect the concentration(K) and why?
- Fri Jan 11, 2019 4:09 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Q and K
- Replies: 13
- Views: 1339
Re: Q and K
Can someone help me with 11.33 from the 6th edition tb. I keep on getting 69.4 instead of 6.9.
- Sun Dec 09, 2018 5:41 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Strengths of H2S vs H2Se
- Replies: 4
- Views: 9175
Re: Strengths of H2S vs H2Se
Why is London Disperse Force in every bond?
- Sun Dec 09, 2018 5:39 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Ligands
- Replies: 6
- Views: 1039
Re: Ligands
What is the function of cisplatin?
- Sun Dec 09, 2018 5:35 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Why HF is a weaker acid than HCl
- Replies: 17
- Views: 16298
Re: Why HF is a weaker acid than HCl
Why is it when there is more oxygen then the bond is more acidic?
- Thu Nov 29, 2018 10:02 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand charge
- Replies: 4
- Views: 634
Re: Ligand charge
Do we need to know the biological importance for the final?
- Thu Nov 29, 2018 9:53 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining polar and non polar molecules from a lewis structure
- Replies: 8
- Views: 2902
Re: Determining polar and non polar molecules from a lewis structure
How do you know HCN is polar or non polar?
- Thu Nov 29, 2018 9:50 pm
- Forum: Naming
- Topic: Naming complexes and coordination compounds
- Replies: 4
- Views: 453
Re: Naming complexes and coordination compounds
What was he saying about the bis, tris and all when are we supposed to use that?
- Mon Nov 26, 2018 7:22 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 9
- Views: 719
Re: VSEPR
What is the difference between square planar and tetrahedral?
- Mon Nov 26, 2018 7:21 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 9
- Views: 719
Re: VSEPR
What is the difference between square planar and tetrahedral?
- Mon Nov 26, 2018 7:20 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR
- Replies: 9
- Views: 719
Re: VSEPR
What is the steric number and why is it important?
- Mon Nov 26, 2018 7:19 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar vs. Non-polar
- Replies: 3
- Views: 355
Re: Polar vs. Non-polar
how do you know if a bond is polar or non polar?
- Fri Nov 16, 2018 10:48 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Repulsion and Stability
- Replies: 3
- Views: 267
Re: Repulsion and Stability
So lower repulsion equals higher stability ?
- Fri Nov 16, 2018 10:47 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 3
- Replies: 19
- Views: 1392
Re: Test 3
Yeah memorizing will be easier I made flashcards which are pretty helpful.
- Fri Nov 16, 2018 10:46 pm
- Forum: Lewis Structures
- Topic: Molecule Shape
- Replies: 8
- Views: 773
Re: Molecule Shape
Do we have to know how to draw each molecular shape for the test or are we just going to be identifying them?
- Sat Nov 10, 2018 4:26 pm
- Forum: Lewis Structures
- Topic: Molecule Shape
- Replies: 8
- Views: 773
Re: Molecule Shape
Why is Hydrogen bond shape not 90 degrees but 109 degrees I didn't understand that part.
- Sat Nov 10, 2018 4:23 pm
- Forum: Ionic & Covalent Bonds
- Topic: Iconic v Covalent Strength
- Replies: 4
- Views: 407
Re: Iconic v Covalent Strength
How is covalent bond dissociation energy is related to covalent bond multiplicity, atomic radius,
and the presence of unpaired electrons? Can someone explain in detail.
and the presence of unpaired electrons? Can someone explain in detail.
- Sat Nov 10, 2018 4:20 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: Induced Dipole-Induced Dipole names?
- Replies: 4
- Views: 877
Re: Induced Dipole-Induced Dipole names?
What is Induced dipole?
- Tue Oct 30, 2018 10:36 pm
- Forum: Limiting Reactant Calculations
- Topic: Midterm Review Q2
- Replies: 8
- Views: 4370
Re: Midterm Review Q2
How would I solve this? Potassium permanganate, KMnO4, is an inorganic chemical compound used for cleaning wounds. 5.00 g of KMnO4 is dissolved in a 150.00 mL flask of water. If 20.00 mL of this solution is removed and placed in a new 2nd 250.00 mL flask and filled with water, what is the concentrat...
- Tue Oct 30, 2018 8:15 pm
- Forum: Limiting Reactant Calculations
- Topic: Midterm Review Q2
- Replies: 8
- Views: 4370
Re: Midterm Review Q2
How did you identify O2 is limiting reactant is it because 31.7 is less than 37.2. The smaller number is limiting reactant?
- Sun Oct 28, 2018 2:01 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Quantum Numbers n, l, and m
- Replies: 5
- Views: 379
Re: Quantum Numbers n, l, and m
How do you know if the spin is up or down?
- Sun Oct 28, 2018 1:57 pm
- Forum: Lewis Structures
- Topic: Dots in Lewis Stucture
- Replies: 14
- Views: 1239
Re: Dots in Lewis Stucture
Yeah it doesn't matter where you place them but it needs to be placed symmetrically.
- Sun Oct 28, 2018 1:55 pm
- Forum: Lewis Structures
- Topic: Electron configuration
- Replies: 2
- Views: 150
Re: Electron configuration
The 4s state is higher in energy than 3d.
- Sat Oct 20, 2018 3:51 pm
- Forum: Photoelectric Effect
- Topic: Threshold energy [ENDORSED]
- Replies: 17
- Views: 2183
Re: Threshold energy [ENDORSED]
whats is work function and how is it solved?
- Sat Oct 20, 2018 3:49 pm
- Forum: Trends in The Periodic Table
- Topic: s, p, d, f
- Replies: 16
- Views: 4334
Re: s, p, d, f
The orbitals s,p,d, f have different sizes and shapes.
- s is spherical shape with 1 orbital
-p has 2 lobes on either side of nucleus with 3 orbitals
-d has 4 lobes of e- located on XY-ZX planes with 5 orbitals
f has more complicated shapes with 7 orbitals
- s is spherical shape with 1 orbital
-p has 2 lobes on either side of nucleus with 3 orbitals
-d has 4 lobes of e- located on XY-ZX planes with 5 orbitals
f has more complicated shapes with 7 orbitals
- Sat Oct 20, 2018 12:40 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals
- Replies: 4
- Views: 556
Re: Orbitals
Can someone explain how to do or solve 2.45 from the 6th edition.
- Sat Oct 13, 2018 1:42 pm
- Forum: Properties of Light
- Topic: frequencies and wavelength
- Replies: 6
- Views: 476
Re: frequencies and wavelength
In the formula E=hv what does the letter v respresent? I know E is energy and h is a given number which is the constant but what is v.
- Mon Oct 08, 2018 2:39 pm
- Forum: Properties of Light
- Topic: frequencies and wavelength
- Replies: 6
- Views: 476
frequencies and wavelength
Can some explain me how to do this question step by step it is from the 6th edition. 1.7 (a) The frequency of violet light is 7.1 x10^14 Hz. What is the wavelength (in nanometers) of violet light? (b) When an electron beam strikes a block of copper, x-rays with a frequency of 2.0 x 10^18 Hz are emit...
- Sat Oct 06, 2018 4:55 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Moles [ENDORSED]
- Replies: 6
- Views: 1270
Re: Moles [ENDORSED]
Its because that is the ratio. That is a balanced equation and 1 ratio Fe2O3 to 2 Fe because that what the formula is telling us.
- Thu Oct 04, 2018 9:56 pm
- Forum: Balancing Chemical Reactions
- Topic: L.5 Mass
- Replies: 3
- Views: 375
Re: L.5 Mass
What textbook edition 6 or 7?
- Thu Oct 04, 2018 9:52 pm
- Forum: Limiting Reactant Calculations
- Topic: Percent Yield
- Replies: 5
- Views: 965
Re: Percent Yield
ok that makes sense!
- Tue Oct 02, 2018 8:51 pm
- Forum: Limiting Reactant Calculations
- Topic: Percent Yield
- Replies: 5
- Views: 965
Percent Yield
I am confused on how to do this I though I just divide 25.2g/35g and multiply it by 100. I got 72% but the answer is 76.6%. What are the steps to this problem? Fundamentals M1 Hydrazine, N2H4, is an oily liquid used as a rocket fuel. It can be prepared in water by oxidizing ammonia with hypochlorite...