when working with rate laws, you should be using concentration.
given grams of a substance and volume you can solve for the M which is concentration to plug into rate laws.
Search found 69 matches
- Tue Mar 12, 2019 11:28 pm
- Forum: First Order Reactions
- Topic: using mass or conc in rate laws
- Replies: 2
- Views: 354
- Tue Mar 12, 2019 11:24 pm
- Forum: First Order Reactions
- Topic: Half-Life
- Replies: 7
- Views: 768
Re: Half-Life
Half life is used to determine the time it takes for a substance to decompose into half its initial amount.
- Tue Mar 12, 2019 11:22 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Negative Order
- Replies: 4
- Views: 799
Re: Negative Order
The negative order means that the rate is being decreased instead of the normal increasing rate (positive order).
- Tue Mar 12, 2019 11:19 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Rate constant
- Replies: 4
- Views: 834
Re: Rate constant
the rate constant, k, will always be positive!
- Tue Mar 12, 2019 11:19 pm
- Forum: Zero Order Reactions
- Topic: Reaction Rate
- Replies: 10
- Views: 1211
Re: Reaction Rate
It is the same k as long as you use the same products and reactants because the numbers they give are under the same temp.
- Fri Mar 01, 2019 12:56 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Reaction Order
- Replies: 3
- Views: 382
Re: Cell Reaction Order
anode ll cathode
- Fri Mar 01, 2019 12:54 am
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: finding DeltaG
- Replies: 6
- Views: 656
Re: finding DeltaG
depending on what is given you will use different equations to solve for deltaG.
- Fri Mar 01, 2019 12:53 am
- Forum: Van't Hoff Equation
- Topic: Van't Hoff use
- Replies: 13
- Views: 2098
Re: Van't Hoff use
you use Van't Hoff when you are trying to relate a K value to the increasing temperature T.
- Wed Feb 27, 2019 2:50 pm
- Forum: Balancing Redox Reactions
- Topic: basic/acidic solutions
- Replies: 5
- Views: 549
Re: basic/acidic solutions
The problem will specify whether the reaction occurs in basic or acidic solution. Depending on where the reaction takes place you use OH or H20 to balance oxygen and hydrogen.
- Wed Feb 27, 2019 2:44 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: E^o(cell) vs. Ecell
- Replies: 6
- Views: 13143
Re: E^o(cell) vs. Ecell
E^ocell just means the cell potential at standard state. Ecell is the nonstandard state conditions.
- Wed Feb 27, 2019 2:42 pm
- Forum: Balancing Redox Reactions
- Topic: Oxidized vs oxidizing agent
- Replies: 6
- Views: 656
Re: Oxidized vs oxidizing agent
Yes, there is a difference. Being oxidized means that molecule is the reducing agent. Being reduced means that the molecule is the oxidizing agent.
- Wed Feb 27, 2019 2:38 pm
- Forum: Balancing Redox Reactions
- Topic: oxidizing agent and reducing agent
- Replies: 15
- Views: 1328
Re: oxidizing agent and reducing agent
what is being reduced is the oxidizing agent and what is being oxidized is the reducing agent.
- Wed Feb 27, 2019 2:37 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: draw galvanic cell
- Replies: 3
- Views: 457
Re: draw galvanic cell
we probably don't need to know how to draw a galvanic cell.
- Wed Feb 27, 2019 2:34 pm
- Forum: Balancing Redox Reactions
- Topic: salt bridge vs porous disk
- Replies: 4
- Views: 2141
Re: salt bridge vs porous disk
the salt bridge and porous disk have the same function which is to balance out both sides of the beaker with salts. salt bridges are represented with two lines and porous only has one.
- Tue Feb 19, 2019 12:38 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Gibbs free energy
- Replies: 7
- Views: 770
Re: Gibbs free energy
Gibbs free energy is the energy that is available to do work, unlike entropy/enthalpy/temperature, it cannot be directly measured.
- Tue Feb 19, 2019 12:21 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: System vs Surroundings
- Replies: 14
- Views: 2099
Re: System vs Surroundings
system is the object, and surrounding is everything around it that can apply heat to it or lose heat.
- Tue Feb 19, 2019 12:20 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Test 3
- Replies: 10
- Views: 968
Re: Test 3
You mean test 2? test 3 will not include gibbs free energy, but test 2 will.
- Mon Feb 04, 2019 4:06 pm
- Forum: Phase Changes & Related Calculations
- Topic: Heat Curve
- Replies: 6
- Views: 606
Re: Heat Curve
It is probably best to understand the heat curve and how to apply it to questions.
- Mon Feb 04, 2019 4:05 pm
- Forum: Phase Changes & Related Calculations
- Topic: Type of systems
- Replies: 12
- Views: 1323
Re: Type of systems
Closed systems and isolated systems are two different types of systems.
- Mon Feb 04, 2019 4:03 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Delta U
- Replies: 7
- Views: 723
Re: Delta U
Delta U is the change in internal energy. If it is positive that means the internal energy is increasing while a negative means decreasing.
- Mon Feb 04, 2019 4:02 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Closed and Isolated
- Replies: 10
- Views: 735
Re: Closed and Isolated
A closed system is where substance can’t be added or removed, but heat can still be transferred in and out. An isolated system is where heat can not be transferred.
- Wed Jan 30, 2019 12:46 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Qsystem+Qsurr=0?
- Replies: 6
- Views: 1841
Re: Qsystem+Qsurr=0?
The Qsystem and Qsurrounding cancel out for the system to be perfect. Therefore the equation would equal 0.
- Wed Jan 30, 2019 12:44 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacity
- Replies: 8
- Views: 762
Re: Heat Capacity
Heat capacity is an extensive property, while specific heat is an intensive property.
- Wed Jan 30, 2019 12:40 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy
- Replies: 4
- Views: 444
Re: Enthalpy
Delta H is the change in enthalpy.
- Wed Jan 30, 2019 12:21 am
- Forum: Phase Changes & Related Calculations
- Topic: Units: Joules vs kJ
- Replies: 5
- Views: 551
Re: Units: Joules vs kJ
As long as you follow the units in the question you should be fine!
- Wed Jan 30, 2019 12:11 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Exothermic vs. Endothermic
- Replies: 10
- Views: 3168
Re: Exothermic vs. Endothermic
Exothermic reactions release energy, delta H is negative, and heat is a product. Endothermic reactions absorb energy, delta H is positive, and heat is a reactant.
- Wed Jan 30, 2019 12:06 am
- Forum: Ideal Gases
- Topic: Q and K
- Replies: 13
- Views: 1309
Re: Q and K
K is the constant at equilibrium while Q is approaching the equilibrium. Solving for Q and comparing it to the K constant can get you the direction in which the reaction is favoring.
- Wed Jan 23, 2019 12:47 pm
- Forum: Ideal Gases
- Topic: Concentration or Partial Pressure
- Replies: 13
- Views: 985
Re: Concentration or Partial Pressure
the question will tell you when to use Kc or Kp
- Wed Jan 23, 2019 12:40 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Le Chatelier's Principle on Temperature
- Replies: 4
- Views: 501
Re: Le Chatelier's Principle on Temperature
When the reaction is exothermic that means heat is being released as a product. If you are lowering the temperature you are essentially removing heat and that means the reaction will favor the product.
- Mon Jan 21, 2019 8:15 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kp vs Kc
- Replies: 7
- Views: 744
Re: Kp vs Kc
Kp has to do with the partial pressure while Kc is the concentration.
- Mon Jan 21, 2019 8:12 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Water in ICE tables
- Replies: 10
- Views: 2591
Re: Water in ICE tables
water is omitted because it is a liquid. solids and liquids do not affect the equilibrium.
- Mon Jan 14, 2019 12:11 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: equilibrium
- Replies: 4
- Views: 412
Re: equilibrium
sits to the left - rxn favors reactants
sits to the right - rxn favors products
sits to the right - rxn favors products
- Mon Jan 14, 2019 12:10 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Temperature
- Replies: 6
- Views: 518
Re: Temperature
The temperature must stay the same in order for the equilibrium constant to stay the same.
- Mon Jan 14, 2019 12:08 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: (aq) in calculating K
- Replies: 9
- Views: 1304
Re: (aq) in calculating K
The aqueous solution is still included in the calculation for K. Only solids and liquids are ignored.
- Mon Jan 14, 2019 12:06 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs Q
- Replies: 4
- Views: 387
Re: K vs Q
K is the constant at equilibrium, Q is the reaction quotient which means the constant when it is not yet at equilibrium.
However, Q and K can be compared to find which reaction is favored (forward or reverse).
However, Q and K can be compared to find which reaction is favored (forward or reverse).
- Mon Jan 14, 2019 12:04 am
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium constant
- Replies: 6
- Views: 536
Re: Equilibrium constant
Kp and Kc both give the equilibrium constant, but Kp is for partial pressure and Kc is for concentration.
- Sun Jan 13, 2019 11:57 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: solids in calculating equilibrium constant? [ENDORSED]
- Replies: 8
- Views: 840
Re: solids in calculating equilibrium constant? [ENDORSED]
Solids and liquids are NOT included when calculating the equilibrium constant because a solids concentration would be 100% which is just 1 and doesn't affect the answer.
Only aqueous solutions and gases are included in the calculation of the equilibrium constant.
Only aqueous solutions and gases are included in the calculation of the equilibrium constant.
- Sun Jan 13, 2019 11:54 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: ICE Tables
- Replies: 3
- Views: 366
Re: ICE Tables
ICE tables can be used for concentration or partial pressure!
- Tue Dec 04, 2018 4:57 pm
- Forum: Sigma & Pi Bonds
- Topic: Strength of Sigma and Pi Bonds
- Replies: 5
- Views: 1097
Re: Strength of Sigma and Pi Bonds
sigma bonds are stronger because the overlap of the sigma bond is smaller than the pi bond so it is harder to break apart.
- Tue Dec 04, 2018 4:52 pm
- Forum: Electronegativity
- Topic: Trend of Electronegativity
- Replies: 18
- Views: 4180
Re: Trend of Electronegativity
yes the trends are the same!
- Tue Dec 04, 2018 4:52 pm
- Forum: Hybridization
- Topic: P orbital
- Replies: 7
- Views: 625
Re: P orbital
The hybridization depends on the amount of electron densitys. (ex: lone pairs, bonds, etc.)
- Tue Dec 04, 2018 4:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polarity
- Replies: 11
- Views: 818
Re: polarity
It is better to check the symmetry of the lewis structure.
- Thu Nov 29, 2018 6:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 3
- Views: 532
Re: Bond Angles
Bond angles are determined by finding out the geometry of the molecule first. (Linear, Tetrahedral, Trigonal Pyramidal etc.) There are helpful charts online!
- Thu Nov 29, 2018 6:07 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR in equal angles
- Replies: 4
- Views: 759
- Thu Nov 29, 2018 5:58 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma vs. Pi
- Replies: 11
- Views: 1637
Re: Sigma vs. Pi
Single Bond: 1 sigma bond
Double Bond: 1 sigma bond + 1 pi bond
Triple bond: 1 sigma bond + 2 pi bonds
Double Bond: 1 sigma bond + 1 pi bond
Triple bond: 1 sigma bond + 2 pi bonds
- Mon Nov 26, 2018 5:25 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 2
- Views: 316
Re: Hybridization
I dont think we are responsible for drawing the hybridization on the test.
- Mon Nov 26, 2018 5:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Radicals
- Replies: 4
- Views: 469
Re: Radicals
a radical is still treated as a electron density in VSEPR.
- Mon Nov 26, 2018 5:19 pm
- Forum: Hybridization
- Topic: Just Kind of Confused
- Replies: 13
- Views: 1014
Re: Just Kind of Confused
The order for hybridization does not matter, but it does for electron configuration!
- Mon Nov 26, 2018 5:17 pm
- Forum: Hybridization
- Topic: Lone pair
- Replies: 4
- Views: 417
Re: Lone pair
hybridzation depends on the number of regions of electron density. since there is 4 regions (1 lone pair and 3 atoms) the hybridization would be s1p3.
- Mon Nov 26, 2018 5:15 pm
- Forum: Hybridization
- Topic: The Number Before Hybridization
- Replies: 3
- Views: 245
Re: The Number Before Hybridization
yes, the number before the hybridzation is the period that the element belongs in.
- Mon Nov 26, 2018 5:14 pm
- Forum: Sigma & Pi Bonds
- Topic: Pi Strength
- Replies: 4
- Views: 424
Re: Pi Strength
a sigma bond is stronger than a pi bond, therefore double bonds are stronger than single bonds.
- Sun Nov 11, 2018 5:09 pm
- Forum: Dipole Moments
- Topic: Hydrogen Bonds
- Replies: 20
- Views: 1495
Re: Hydrogen Bonds
Strongest to weakest
Ionic bond > covalent bond > hydrogen bond > dipole dipole force > London forces
Ionic bond > covalent bond > hydrogen bond > dipole dipole force > London forces
- Sun Nov 11, 2018 5:03 pm
- Forum: Ionic & Covalent Bonds
- Topic: Metallic Bond
- Replies: 7
- Views: 659
Re: Metallic Bond
A metallic bond is a bond between two metals ions :)
- Sun Nov 11, 2018 4:51 pm
- Forum: Lewis Structures
- Topic: Formal charges
- Replies: 15
- Views: 1242
Re: Formal charges
It might be better to calculate the formal charge of each atom so that you can choose the most stable structure.
- Sun Nov 11, 2018 4:48 pm
- Forum: Lewis Structures
- Topic: Expanded Octets
- Replies: 9
- Views: 2810
Expanded Octets
Which elements can have expanded octets and why?
- Sun Nov 11, 2018 4:45 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acid vs base [ENDORSED]
- Replies: 15
- Views: 1524
Re: Acid vs base [ENDORSED]
Lewis acid accepts electrons while Lewis base donates electrons.
- Sun Nov 04, 2018 9:57 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 17603
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Thank you for these practice problems!
- Sun Oct 28, 2018 9:14 pm
- Forum: Photoelectric Effect
- Topic: How to calculate the kinetic energy, energy and frequency? [ENDORSED]
- Replies: 25
- Views: 7434
Re: How to calculate the kinetic energy, energy and frequency? [ENDORSED]
Thank you for this explanation! This was very helpful.
- Sun Oct 28, 2018 9:12 pm
- Forum: Ionic & Covalent Bonds
- Topic: the Octet rule
- Replies: 21
- Views: 4090
Re: the Octet rule
I think that the octet or the half octet is the most stable.
- Thu Oct 25, 2018 10:31 pm
- Forum: DeBroglie Equation
- Topic: Units of De Broglie's Equation
- Replies: 4
- Views: 3448
Re: Units of De Broglie's Equation
Wavelength can also be converted from meters to nanometers and written in that unit.
- Sun Oct 21, 2018 7:56 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: h with a line through it?
- Replies: 8
- Views: 1906
Re: h with a line through it?
H-bar is equal to h/2pi.
- Sun Oct 21, 2018 7:55 pm
- Forum: Einstein Equation
- Topic: Energy of photon [ENDORSED]
- Replies: 12
- Views: 1817
Re: Energy of photon [ENDORSED]
When would we use E=ch/wavelength instead of E=hv, vice versa?
- Sun Oct 21, 2018 7:47 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Electron Shielding
- Replies: 2
- Views: 547
Re: Electron Shielding
I remember during lecture he explained electron shielding in a camping scenario. If you are sitting by a fire and someone walks in between you and the fire then you will feel less heat. Same scenario applies to electron shielding in that further electrons feel “less heat” or “less attraction” to the...
- Fri Oct 12, 2018 10:33 pm
- Forum: DeBroglie Equation
- Topic: Equations
- Replies: 9
- Views: 811
Re: Equations
Yes, I'm pretty sure we will receive all of the formulas needed to take the test.
- Fri Oct 12, 2018 10:23 pm
- Forum: SI Units, Unit Conversions
- Topic: Should Significant Figures be affected by constants?
- Replies: 10
- Views: 939
Re: Should Significant Figures be affected by constants?
Constants do not have an affect on the amount of sig figs to use.
- Fri Oct 12, 2018 10:09 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Advice from a Medical Student [ENDORSED]
- Replies: 297
- Views: 396562
Re: Advice from a Medical Student [ENDORSED]
Thank you for the advice!!
- Fri Oct 12, 2018 9:59 pm
- Forum: Empirical & Molecular Formulas
- Topic: Order of Molecules
- Replies: 4
- Views: 1004
Re: Order of Molecules
I follow the order that is given in the problem.
- Fri Oct 12, 2018 9:55 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3458335
Re: Post All Chemistry Jokes Here
I try to tell chemistry jokes, but there's no reaction.
- Fri Oct 12, 2018 9:44 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
- Replies: 135
- Views: 38889
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Thank you! This was very helpful!