Search found 58 matches
- Tue Mar 13, 2018 8:30 pm
- Forum: *Free Energy of Activation vs Activation Energy
- Topic: Standard Gibbs Free Energy of Activation
- Replies: 2
- Views: 2211
Re: Standard Gibbs Free Energy of Activation
because you need energy for the reaction to happen
- Tue Mar 13, 2018 8:29 pm
- Forum: General Rate Laws
- Topic: Unique Reaction Rates [ENDORSED]
- Replies: 45
- Views: 163565
Re: Unique Reaction Rates [ENDORSED]
It's a unique reaction rate because its the same for all concentrations of reactants and products when multiplied by their stoichiometric coefficient.
- Tue Mar 13, 2018 8:28 pm
- Forum: *Alkanes
- Topic: How to name the Alcohol
- Replies: 4
- Views: 1885
Re: How to name the Alcohol
will naming be on the final?
- Mon Mar 05, 2018 10:42 pm
- Forum: Second Order Reactions
- Topic: Order reactions
- Replies: 6
- Views: 1106
Re: Order reactions
Order reactions are determined by how the rate changes in respect to concentration
- Mon Mar 05, 2018 10:40 pm
- Forum: General Rate Laws
- Topic: Temperature Signifcance
- Replies: 4
- Views: 624
Re: Temperature Signifcance
temperature has no relevance for these problems
- Mon Mar 05, 2018 10:40 pm
- Forum: First Order Reactions
- Topic: First order
- Replies: 4
- Views: 764
Re: First order
If the other reactant's concentrations remain constant then yes it would be first order
- Fri Mar 02, 2018 11:08 am
- Forum: First Order Reactions
- Topic: First Order Graph
- Replies: 11
- Views: 1950
Re: First Order Graph
A proper first order graph is just a straight decreasing line?
- Fri Mar 02, 2018 11:07 am
- Forum: Zero Order Reactions
- Topic: Order Reactions [ENDORSED]
- Replies: 4
- Views: 853
Re: Order Reactions [ENDORSED]
Order reveals how the concentrations of reactants relate to the rate
- Fri Mar 02, 2018 11:07 am
- Forum: Zero Order Reactions
- Topic: Units of k [ENDORSED]
- Replies: 13
- Views: 1536
Re: Units of k [ENDORSED]
Unit of K is in a format so that the rate becomes mol/L S
- Sun Feb 25, 2018 8:30 pm
- Forum: Student Social/Study Group
- Topic: Chemistry Joke
- Replies: 57
- Views: 5256
Re: Chemistry Joke
What did the basic DJ say?
Drop the base!!!
Drop the base!!!
- Sun Feb 25, 2018 8:29 pm
- Forum: Student Social/Study Group
- Topic: Chemistry Joke
- Replies: 57
- Views: 5256
Re: Chemistry Joke
Did you gain an electron because I’m starting to feel some charge
- Sun Feb 25, 2018 8:29 pm
- Forum: Student Social/Study Group
- Topic: Chemistry Joke
- Replies: 57
- Views: 5256
Re: Chemistry Joke
These are some funny jokes!!
- Tue Feb 20, 2018 11:54 pm
- Forum: Student Social/Study Group
- Topic: Chemistry Joke
- Replies: 57
- Views: 5256
Re: Chemistry Joke
if you aren't part of the solution you're part of the precipitate
- Tue Feb 20, 2018 11:52 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3592477
Re: Post All Chemistry Jokes Here
dont trust an atom. Why? they make up everything
- Tue Feb 20, 2018 11:51 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: cell diagram [ENDORSED]
- Replies: 2
- Views: 327
cell diagram [ENDORSED]
how do you order the cell diagram aside from anode is left and cathode is right
- Mon Feb 12, 2018 10:04 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 9.63
- Replies: 2
- Views: 525
Re: 9.63
If the compound has a negative delta G value then it's stable
- Mon Feb 12, 2018 10:02 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 9.75
- Replies: 1
- Views: 368
9.75
For 9.75, my calculator can't calculate using Botlzmann's because it overflows...what would i do on the exam?
- Mon Feb 12, 2018 10:00 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: 9.81
- Replies: 1
- Views: 323
9.81
What is the logic behind the solution to this problem?
- Wed Feb 07, 2018 10:30 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Open System
- Replies: 16
- Views: 2314
Re: Open System
you can increase energy via:
1. Add or subtract matter
2. Add or subtract heat
3. do work on it
1. Add or subtract matter
2. Add or subtract heat
3. do work on it
- Wed Feb 07, 2018 10:29 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Isolated
- Replies: 9
- Views: 1102
Re: Isolated
Heat is contained in the isolated system so it changes within itself. The only thing that cant be changed is volume because its constant
- Wed Feb 07, 2018 10:28 am
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: exothermic
- Replies: 5
- Views: 745
Re: exothermic
If a flask turns cold its endothermic because it absorbs heat
- Wed Jan 31, 2018 10:24 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Change in S with changes in P, V, and T
- Replies: 3
- Views: 545
Re: Change in S with changes in P, V, and T
You wont be asked a problem with all three of those being unknown because its not possible to calculate one without the other 2
- Wed Jan 31, 2018 10:22 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: The value of Cp
- Replies: 8
- Views: 1540
Re: The value of Cp
Cp of ideal gases is 5/2(R) and Cv is 3/2(R)
- Wed Jan 31, 2018 10:21 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: sign of entropy
- Replies: 11
- Views: 1683
Re: sign of entropy
sign of entropy depends on flow of heat
- Wed Jan 24, 2018 10:34 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Exothermic
- Replies: 7
- Views: 892
Re: Exothermic
for an exo reaction delta H is always negative implying the release of heat (thus the reaction is warmer)
- Wed Jan 24, 2018 10:33 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Significant Figures of ∆H
- Replies: 3
- Views: 611
Re: Significant Figures of ∆H
yep sig figs will depend on the smallst enthalpy value i.e 322KJ is 3 SF
- Wed Jan 24, 2018 10:32 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: 8.63
- Replies: 4
- Views: 603
8.63
For part c does the h20 (1) have a different formation enthalpy because when i calculate evreything my value is off
- Sun Jan 21, 2018 11:34 pm
- Forum: Phase Changes & Related Calculations
- Topic: Work Equation
- Replies: 3
- Views: 251
Re: Work Equation
The negative signifies a loss in energy
- Sun Jan 21, 2018 11:33 pm
- Forum: Phase Changes & Related Calculations
- Topic: Test 1 [ENDORSED]
- Replies: 7
- Views: 962
Re: Test 1 [ENDORSED]
will all the equations be on a formula sheet?
- Sun Jan 21, 2018 11:31 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3592477
Re: Post All Chemistry Jokes Here
An electron went on a date, it was electric
- Wed Jan 17, 2018 10:19 am
- Forum: Phase Changes & Related Calculations
- Topic: Open/Closed/Isolated
- Replies: 11
- Views: 1176
Re: Open/Closed/Isolated
isolated systems are in fixed quantities with no interaction with its outside environment i.e thermos
- Wed Jan 17, 2018 10:18 am
- Forum: Phase Changes & Related Calculations
- Topic: Open/Closed/Isolated
- Replies: 11
- Views: 1176
Re: Open/Closed/Isolated
with the lid on a fish tank is a closed system
- Wed Jan 17, 2018 10:14 am
- Forum: Phase Changes & Related Calculations
- Topic: Formula Sheet? [ENDORSED]
- Replies: 3
- Views: 396
Re: Formula Sheet? [ENDORSED]
I feel like this formula sheet will include heat capacities etc
- Fri Jan 12, 2018 10:24 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3592477
Re: Post All Chemistry Jokes Here
What do you call a tooth in a glass of water?
A molar solution
*ba dum tss
A molar solution
*ba dum tss
- Fri Jan 12, 2018 10:22 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3592477
Re: Post All Chemistry Jokes Here
Why can't atoms be trusted?
Because they make up everything
Because they make up everything
- Fri Jan 12, 2018 10:21 am
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3592477
Re: Post All Chemistry Jokes Here
What kind of dogs do chemists have?
Laboratory retrievers
Laboratory retrievers
- Sun Dec 03, 2017 11:27 pm
- Forum: Dipole Moments
- Topic: When do dipole moments occur?
- Replies: 3
- Views: 950
Re: When do dipole moments occur?
Dipole occurs in a covalently bonded atom, usually when the lewis structure is not symmetric (unequal charges)
- Sun Dec 03, 2017 11:26 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Chemical Equilibrium
- Replies: 3
- Views: 555
Re: Chemical Equilibrium
usually yes it's a liquid or aqueous solution
prefixes
How do you determine the proper prefixes for ligands
- Mon Nov 27, 2017 9:35 am
- Forum: Naming
- Topic: coordination compounds
- Replies: 1
- Views: 297
coordination compounds
how do you name coordination compounds?
- Fri Nov 17, 2017 9:42 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: TM Cations
- Replies: 2
- Views: 425
Re: TM Cations
if a TM doesn't form 6 bonds how many bonds would it usually form?
- Fri Nov 17, 2017 9:41 pm
- Forum: Naming
- Topic: Roman Numeral
- Replies: 2
- Views: 245
Re: Roman Numeral
the roman numeral represents the charge of the transition metal
- Tue Nov 07, 2017 6:41 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic and Covalent Bonds
- Replies: 9
- Views: 1153
Re: Ionic and Covalent Bonds
Ionic bonds are btween a metal and non metal, and a covalent bond is between two non metals
- Tue Nov 07, 2017 6:40 pm
- Forum: Lewis Structures
- Topic: Shape
- Replies: 5
- Views: 589
Shape
Will we get marked off if our shapes our different? say the compound is NCl3, would we get marked off if we had it in the shape of _l_ instead of a mercedes logo type shape?
- Wed Nov 01, 2017 11:04 am
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius vs. Ionic Radius [ENDORSED]
- Replies: 4
- Views: 869
Re: Atomic Radius vs. Ionic Radius [ENDORSED]
Atomic radius is half the distance between the center of two atoms. ionic radius is the distance between 2 ions.
- Wed Nov 01, 2017 11:02 am
- Forum: Trends in The Periodic Table
- Topic: Ie [ENDORSED]
- Replies: 1
- Views: 302
Ie [ENDORSED]
What is the difference between ionization energy and electron affinity?
- Thu Oct 26, 2017 9:28 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: s- electrons vs p- electrons [ENDORSED]
- Replies: 7
- Views: 1652
Re: s- electrons vs p- electrons [ENDORSED]
It's because of the less shielding
- Thu Oct 26, 2017 6:48 pm
- Forum: Trends in The Periodic Table
- Topic: atomic size
- Replies: 4
- Views: 704
atomic size
for atomic radius, if an element is lower on the periodic table but closer to the right side, would it be bigger or smaller than an element higher on the periodic table thats on the left side
- Sun Oct 22, 2017 7:44 pm
- Forum: DeBroglie Equation
- Topic: When to use De Broglie Equation [ENDORSED]
- Replies: 11
- Views: 5219
Re: When to use De Broglie Equation [ENDORSED]
Use when you have mass and velocity and need wavelength
- Sun Oct 22, 2017 7:44 pm
- Forum: DeBroglie Equation
- Topic: units for mass
- Replies: 6
- Views: 973
Re: units for mass
because joules is per kilogram
- Tue Oct 17, 2017 9:00 pm
- Forum: Properties of Light
- Topic: Rydberg's Constant
- Replies: 4
- Views: 905
Re: Rydberg's Constant
In the textbook 3.29x10^15 is the number used to represent Rydberg, so I would use that value.
- Tue Oct 17, 2017 8:59 pm
- Forum: Properties of Light
- Topic: Planck's Constant
- Replies: 10
- Views: 1275
Re: Planck's Constant
Use planck's constant whenever you need to use/derive equations involving the variable h
- Thu Oct 12, 2017 6:32 pm
- Forum: Einstein Equation
- Topic: question 27
- Replies: 2
- Views: 553
question 27
For question 27, it wants moles of photons, and i found energy to be 4.7x10^-19 J/photon, but when converting to just photons the solution Manual turns the 4.7x10^-19 into photons/J to cancel out jules with the 64J. Why did they do this
- Thu Oct 12, 2017 4:02 pm
- Forum: Photoelectric Effect
- Topic: Energy in kj or j when solving a problem?
- Replies: 10
- Views: 2055
Re: Energy in kj or j when solving a problem?
If we have kg or km should we convert to g and m?
- Wed Oct 11, 2017 10:21 pm
- Forum: Properties of Light
- Topic: Question 1.15
- Replies: 1
- Views: 409
Question 1.15
Did anyone understand question 13? What is the Rydberg formula?
- Wed Oct 11, 2017 10:17 pm
- Forum: Properties of Light
- Topic: Velocity [ENDORSED]
- Replies: 13
- Views: 1624
Velocity [ENDORSED]
Is Velocity (m/s) the same as speed?
- Thu Oct 05, 2017 11:02 pm
- Forum: Significant Figures
- Topic: Does temperature count for sig figs? [ENDORSED]
- Replies: 4
- Views: 16257
Re: Does temperature count for sig figs? [ENDORSED]
yes all values incorporated into your calculations count for sig figs
- Tue Oct 03, 2017 11:46 pm
- Forum: Limiting Reactant Calculations
- Topic: Textbook fundamentals M
- Replies: 1
- Views: 321
Textbook fundamentals M
Has anyone completed fundamentals part M question 19? I can't seem to get the correct answer