Catalyst is there in the beginning of the reaction and is then used up and recreated.
Intermediate is created and then used up.
Search found 62 matches
- Thu Mar 14, 2019 11:19 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: catalyst or intermediate
- Replies: 3
- Views: 408
- Thu Mar 14, 2019 11:13 pm
- Forum: General Rate Laws
- Topic: slow/fast steps
- Replies: 7
- Views: 667
Re: slow/fast steps
Yeah it should be given.
- Thu Mar 14, 2019 11:09 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: A in the Arrhenius Equation
- Replies: 4
- Views: 397
Re: A in the Arrhenius Equation
It gives the frequency at which the reactants collide correctly to form products.
I'm pretty sure for this class A will either be given or just equal to 1.
I'm pretty sure for this class A will either be given or just equal to 1.
- Thu Mar 14, 2019 11:08 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Catalysts in Rate Law
- Replies: 5
- Views: 568
Re: Catalysts in Rate Law
Yes, catalysts can be included in the rate law.
- Thu Mar 14, 2019 11:07 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Adding an Inert Gas
- Replies: 4
- Views: 610
Re: Adding an Inert Gas
An inert gas is not reactive so it doesn't affect the reaction at all.
- Thu Mar 14, 2019 11:01 pm
- Forum: General Rate Laws
- Topic: Final
- Replies: 9
- Views: 1117
Re: Final
It'll probably be pretty strict because thermodynamics and kinetics require specific units.
- Thu Mar 14, 2019 10:58 pm
- Forum: Method of Initial Rates (To Determine n and k)
- Topic: Units of k
- Replies: 5
- Views: 930
Re: Units of k
Zero-order reaction is mol L-1 s-1
First-order reaction is s-1
Second-order reaction is L mol-1 s-1.
First-order reaction is s-1
Second-order reaction is L mol-1 s-1.
- Thu Mar 14, 2019 10:49 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: When to use quadratic equation
- Replies: 2
- Views: 630
Re: When to use quadratic equation
Quadratic formulas are usually used with ICE tables, when you don't know the concentration of 1 or more of the reactants or products.
- Thu Mar 14, 2019 10:46 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: catalyst vs intermediate
- Replies: 9
- Views: 904
Re: catalyst vs intermediate
Catalyst is there in the beginning of reaction and is then recreated later on. An intermediate is created and used up during the reaction.
- Thu Mar 14, 2019 9:00 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Ranking species
- Replies: 3
- Views: 544
Re: Ranking species
More positive E value means it will have a higher oxidizing power.
More negative E value means it will have a higher reducing power.
More negative E value means it will have a higher reducing power.
- Thu Mar 14, 2019 3:46 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Rate laws
- Replies: 2
- Views: 319
Re: Rate laws
No, catalysts only influence a reaction rate. They do not appear in the rate law.
- Thu Mar 14, 2019 3:44 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Intermediate vs catalyst
- Replies: 8
- Views: 857
Re: Intermediate vs catalyst
Intermediate is created and then used up throughout the steps.
A catalyst is there when the reaction begins and is then recreated later on.
A catalyst is there when the reaction begins and is then recreated later on.
- Thu Mar 14, 2019 1:26 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Expansion of a system
- Replies: 8
- Views: 1202
Re: Expansion of a system
Volume increases and system does work are ways to tell if expansion is happening.
- Thu Mar 14, 2019 1:24 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Internal energy (U) of an isolated system
- Replies: 17
- Views: 2725
Re: Internal energy (U) of an isolated system
An isolated system cannot exchange matter or energy so there is no change.
- Thu Mar 14, 2019 1:16 pm
- Forum: Calculating Work of Expansion
- Topic: Work without change in volume
- Replies: 8
- Views: 1139
Re: Work without change in volume
No change in volume means no work is done.
- Thu Mar 14, 2019 1:13 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts
- Replies: 6
- Views: 598
Re: Catalysts
A catalyst is there in the beginning of the reaction and is then recreated at a later step of the reaction.
- Thu Mar 14, 2019 1:11 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst
- Replies: 14
- Views: 1234
Re: Nernst
Yup, you find total e- after you balance the reaction.
- Thu Mar 14, 2019 1:10 pm
- Forum: Balancing Redox Reactions
- Topic: How to tell if its in acidic or basic
- Replies: 6
- Views: 702
Re: How to tell if its in acidic or basic
Going off of test 2, they usually tell you if it is an acidic or basic solution.
- Thu Mar 14, 2019 1:03 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: deltaU=0
- Replies: 1
- Views: 397
Re: deltaU=0
DeltaU can be zero if q and w=0 or q=w (isothermal).
- Thu Mar 14, 2019 12:58 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Adiabatic and isothermal
- Replies: 6
- Views: 2280
Re: Adiabatic and isothermal
Adiabatic: q=0
Isothermal: T=0
Isothermal: T=0
- Thu Mar 14, 2019 12:48 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Determining Catalysts from Diagrams (7E.5)
- Replies: 3
- Views: 510
Re: Determining Catalysts from Diagrams (7E.5)
A catalyst is used up in the beginning of the reaction and then recreated.
An intermediate is created and then used up.
An intermediate is created and then used up.
- Thu Mar 14, 2019 12:44 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Pseudo Equilibrium Constant
- Replies: 1
- Views: 230
Re: Pseudo Equilibrium Constant
It tells you the order of the reaction for one reactant, but it is pseudo because you had to put another reactant in excess to figure it out.
- Thu Mar 14, 2019 12:41 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Cell Diagram Order
- Replies: 2
- Views: 306
Re: Cell Diagram Order
Anode is always on the left and the cathode is on the right so:
Anode electrode|Oxidation reaction||Reduction reaction|Cathode electrode
Anode electrode|Oxidation reaction||Reduction reaction|Cathode electrode
- Thu Mar 14, 2019 12:35 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Bimolecular
- Replies: 13
- Views: 2269
Re: Bimolecular
Athena L 1B wrote:So is a bimolecular reaction another way of saying it's second order?
A bimolecular reaction is always a second order reaction but not all second order reactions are bimolecular.
- Thu Mar 14, 2019 12:33 pm
- Forum: Biological Examples
- Topic: biological examples for final
- Replies: 10
- Views: 1715
Re: biological examples for final
Each chapter in the textbook that we need to know has a brief section on the biological applications, so it would probably be helpful to review those.
- Thu Mar 14, 2019 12:31 pm
- Forum: Kinetics vs. Thermodynamics Controlling a Reaction
- Topic: Activation Energy
- Replies: 16
- Views: 1521
Re: Activation Energy
Activation energy is the energy required to cause a reaction to happen. It is represented by the highest peak on an energy graph.
- Thu Mar 14, 2019 12:29 pm
- Forum: General Rate Laws
- Topic: k1 vs k2?
- Replies: 4
- Views: 1921
Re: k1 vs k2?
K changes when it is a different reaction or the same reaction is performed at a different temperature.
- Thu Mar 14, 2019 12:26 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: collision theory
- Replies: 2
- Views: 313
Re: collision theory
I don't think so, it didn't show up on any of the outlines
- Thu Mar 14, 2019 12:24 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: comparing forward and reverse rates
- Replies: 4
- Views: 469
Re: comparing forward and reverse rates
Constants are different from the rate at which the reaction proceeds, so K values are not equal but the rates are.
- Sun Jan 13, 2019 5:59 pm
- Forum: Ideal Gases
- Topic: Pv=nRT [ENDORSED]
- Replies: 12
- Views: 800
Re: Pv=nRT [ENDORSED]
Emily Kennedy 4L wrote:we only use this equation to convert from partial pressure to concentration and vice versa rt?
Yes, you would use P/RT=Concentration
- Sun Jan 13, 2019 5:55 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: reaction quotient [ENDORSED]
- Replies: 4
- Views: 551
Re: reaction quotient [ENDORSED]
Jaira_Murphy_2D wrote:Is the reaction quotient unit-less as well?
Yes the reaction quotient is unit-less
- Sun Jan 13, 2019 5:53 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Constants using pressure or concentration
- Replies: 2
- Views: 171
Re: Constants using pressure or concentration
Most likely, you use concentration for calculating K. However, you will be able to find out whether to use pressure or concentration if it is denoted K(p) for pressure or K(c) for concentration.
- Fri Dec 07, 2018 12:28 pm
- Forum: Naming
- Topic: Coordination Compounds on the Final
- Replies: 2
- Views: 329
Re: Coordination Compounds on the Final
I would memorize them just to be safe. Definitely know EN and EDTA.
- Fri Dec 07, 2018 12:19 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: pH sig figs
- Replies: 4
- Views: 716
Re: pH sig figs
My TA said to follow the decimal rule. Count sig figs after the decimal.
- Fri Dec 07, 2018 12:18 pm
- Forum: Bronsted Acids & Bases
- Topic: Question on Acidity
- Replies: 1
- Views: 260
Re: Question on Acidity
It leans more towards size. HF is very electronegative but very small. Because it is so small, it doesn't handle the negative charge very well, making it unstable. So, H2Se would be stronger than HF because Se can handle its charge better.
- Sun Dec 02, 2018 4:48 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final [ENDORSED]
- Replies: 10
- Views: 1367
Re: Final [ENDORSED]
As of right now, I don't think there is a practice final. I think at the review sessions they're going to hand out practice problems.
- Sun Dec 02, 2018 4:33 pm
- Forum: Lewis Acids & Bases
- Topic: acid names
- Replies: 8
- Views: 774
Re: acid names
I think we definitely need to know the formula for acetic acid and know strong acids as well.
- Sun Dec 02, 2018 4:18 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Final pH
- Replies: 3
- Views: 373
Re: Final pH
Also, pOH measures the concentration of OH- in solution. Because we evaluate on a pH scale, you need to subtract it from 14
- Mon Nov 19, 2018 5:06 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 3
- Views: 140
Re: Bond Angles
It's less than 90 and 120 degrees.
- Mon Nov 19, 2018 4:43 pm
- Forum: Hybridization
- Topic: Hybridized Orbitals
- Replies: 4
- Views: 406
Re: Hybridized Orbitals
The s and p orbital combined only make up 4 areas of electron density. However, as we've seen a molecule can have more than that. Thus, the d orbital gets involved because it contributes electrons while bonding and can be part of a hybrid orbital.
- Mon Nov 19, 2018 4:41 pm
- Forum: Hybridization
- Topic: Labeling Compounds
- Replies: 4
- Views: 349
Re: Labeling Compounds
Because there are only 3 p orbitals that exist and can be filled and s also contributes an orbital, so there is a total of 4 areas of electron density/orbitals
- Sun Nov 18, 2018 10:08 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pairs
- Replies: 5
- Views: 559
Re: Lone pairs
Yes, lone pairs change the shape by changing bond angles so the name changes as well.
- Sun Nov 18, 2018 10:03 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles for H2O
- Replies: 8
- Views: 8943
Re: Bond Angles for H2O
This is because the molecule is polar so the positive side (H atoms) are drawn towards negative side (O and lone pairs) making the angle smaller.
- Sun Nov 18, 2018 10:00 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar/Nonpolar
- Replies: 3
- Views: 371
Re: Polar/Nonpolar
In CH2Cl2, the 2 bonds create a dipole towards the Cl since it is electronegative. This makes the molecule negative towards the Cl and away from the 2 H.
- Sun Nov 11, 2018 8:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 4.3 Draw the structures and name the shapes of the following molecules: (a) HCN; (b) CH2F2.
- Replies: 4
- Views: 1604
Re: 4.3 Draw the structures and name the shapes of the following molecules: (a) HCN; (b) CH2F2.
The name of the VSEPR structures are as follows
a) linear
b) tetrahedral
a) linear
b) tetrahedral
- Sun Nov 11, 2018 8:30 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: molecular shapes
- Replies: 13
- Views: 985
Re: molecular shapes
He'll go over them most likely but eventually we'll have to know shape, name, bond angle, and hoe to draw molecules with up to 6 bonds.
- Sun Nov 11, 2018 8:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: tetrahedral
- Replies: 3
- Views: 392
Re: tetrahedral
It is because molecules exist in the 3d world. Because of that, the atoms want to be far from each other as possible because of electron repulsion so the bind angle is 109.5 degrees.
- Sun Nov 04, 2018 6:18 pm
- Forum: Ionic & Covalent Bonds
- Topic: Naming Ionic Compounds
- Replies: 5
- Views: 501
Re: Naming Ionic Compounds
There isn't anything about naming because we haven't gone over it yet.
- Sun Nov 04, 2018 6:14 pm
- Forum: Lewis Structures
- Topic: Expanded Octet
- Replies: 4
- Views: 512
Re: Expanded Octet
Yes, Iodine is larger and has more orbitals, so it has more electrons to make bonds.
- Sun Nov 04, 2018 4:52 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm questions
- Replies: 5
- Views: 452
Re: Midterm questions
All the way up to 3.11 in 6th edition and 2C in the 7th.
- Sun Oct 28, 2018 5:05 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic Bonds vs Covalent Bonds
- Replies: 7
- Views: 734
Re: Ionic Bonds vs Covalent Bonds
Ionic bonds also tend to make lattice structures that are very hard to break, making the bond stronger.
- Sun Oct 28, 2018 4:56 pm
- Forum: Resonance Structures
- Topic: Resonance Structures
- Replies: 5
- Views: 460
Re: Resonance Structures
What are some examples of resonance structures? Do they only occur in bonds between certain molecules? Resonance structures are used when one Lewis structure for a single molecule cannot fully describe the bonding that takes place. Polyatomic icons usually have resonance structures, like nitrate fo...
- Sun Oct 28, 2018 4:48 pm
- Forum: Ionic & Covalent Bonds
- Topic: Unit of Atomic Radius
- Replies: 4
- Views: 390
Re: Unit of Atomic Radius
It is most commonly measured in Angstroms.
- Sun Oct 28, 2018 4:45 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonds
- Replies: 7
- Views: 708
Re: Covalent Bonds
Nonmetals tend to have higher electronegativity. So they attract more electrons, making it easier to form anions.
- Sun Oct 28, 2018 4:41 pm
- Forum: Lewis Structures
- Topic: Ground State e- Configuration
- Replies: 3
- Views: 322
Re: Ground State e- Configuration
Atoms typically seek to fill each energy level before moving onto the next one as it helps with stability. Thus, Ag would fill up the 4d energy level before moving up.
- Sun Oct 28, 2018 4:36 pm
- Forum: Ionic & Covalent Bonds
- Topic: the Octet rule
- Replies: 21
- Views: 4155
Re: the Octet rule
Usually, most atoms try to follow the octet rule. However, there are cases where 1) molecules have an odd number of electrons (ex. NO), 2) two few valence electrons result in an incomplete octet usually common w boron, aluminum, and beryllium (ex. BH3), or 3) expanded octets - molecules possess more...
- Sun Oct 14, 2018 2:50 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: diatomic elements
- Replies: 12
- Views: 9983
Re: diatomic elements
Karina Jiayu Xu 4E wrote:Does anyone know what order to put the elements in when writing an empirical formula?
In an empirical formula, it's typically C, H, and then other elements follow in alphabetical order.
- Sun Oct 14, 2018 2:45 pm
- Forum: Properties of Electrons
- Topic: Wave Length Calculations
- Replies: 5
- Views: 408
Re: Wave Length Calculations
Conservatively, 10^-18 is when it becomes too small to notice.
- Sun Oct 14, 2018 2:43 pm
- Forum: Properties of Light
- Topic: Geiger and Marsden experiment
- Replies: 3
- Views: 223
Re: Geiger and Marsden experiment
Geiger and Marsden performed a series of experiments where they pointed a beam of alpha particles at a thin foil of metal and measured the scattering pattern by using a fluorescent screen. They spotted alpha particles bouncing off the metal foil in all directions, some right back at the source. They...
- Thu Oct 04, 2018 5:59 pm
- Forum: Empirical & Molecular Formulas
- Topic: Homework Problem F.3 (part a)
- Replies: 2
- Views: 220
Re: Homework Problem F.3 (part a)
Nitric Acid is HNO3 Usually, when something is an acid it contains an H+ ion. Because it is Nitric, that means it has an NO3- ion (because it ends in "-ic" that means the ion itself ends in "-ate", so a nitrate ion). I'm pretty sure Dr. Lavelle said we would be learning how to na...
- Thu Oct 04, 2018 5:32 pm
- Forum: SI Units, Unit Conversions
- Topic: HW E.9
- Replies: 3
- Views: 399
Re: HW E.9
I'm pretty sure for now Dr. Lavelle said he would give us the formula but we'll be learning how to name them and find their formulas pretty soon.
Magnesium sulfate heptahydrate would be MgSO4 * 7(H2O)
Hope this helps!
Magnesium sulfate heptahydrate would be MgSO4 * 7(H2O)
Hope this helps!
- Thu Oct 04, 2018 5:19 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molecular Formulas
- Replies: 5
- Views: 1021
Re: Molecular Formulas
Because it's asking you to find the atom ratios, you're basically trying to find the empirical formula. You would assume that you have 100 g of Vanillin so you can convert each percent composition to grams, giving you the mass. So, 63.15% C would be 63.15 g C, and so on and you would convert it to m...