Search found 67 matches
- Tue Mar 12, 2019 2:39 pm
- Forum: Second Order Reactions
- Topic: amounts of reactant and its affect on rate
- Replies: 6
- Views: 543
Re: amounts of reactant and its affect on rate
Yes that is exactly what happens! Good work!
- Tue Mar 12, 2019 2:38 pm
- Forum: Phase Changes & Related Calculations
- Topic: joules conversion factor
- Replies: 7
- Views: 982
Re: joules conversion factor
We are given this information on the equation sheet on our tests! Good luck!
- Tue Mar 12, 2019 2:37 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Energies
- Replies: 2
- Views: 262
Re: Energies
activation energy: The minimum energy required for a reaction to occur. Free energy is a thermodynamic quantity equivalent to the capacity of a system to do work.
- Tue Mar 12, 2019 2:36 pm
- Forum: Ideal Gases
- Topic: Approximations for ICE
- Replies: 20
- Views: 1531
Re: Approximations for ICE
I think when k is less than 10^-3
- Tue Mar 12, 2019 2:10 pm
- Forum: Phase Changes & Related Calculations
- Topic: rotational v vibrational energy
- Replies: 5
- Views: 851
Re: rotational v vibrational energy
Rotational energy refers to the movement around an axis while vibrational refers to moving back and forth on one axis.
- Tue Mar 12, 2019 2:07 pm
- Forum: Phase Changes & Related Calculations
- Topic: 4.18J or 0.38J
- Replies: 8
- Views: 1198
Re: 4.18J or 0.38J
4.18 J is specific heat capacity of water while
0.38 J refers to the specific heat capacity of copper.
0.38 J refers to the specific heat capacity of copper.
- Tue Mar 12, 2019 2:07 pm
- Forum: Phase Changes & Related Calculations
- Topic: 4.18J or 0.38J
- Replies: 8
- Views: 1198
Re: 4.18J or 0.38J
4.18 J is specific heat capacity of water while
0.38 J refers to the specific heat capacity of copper.
0.38 J refers to the specific heat capacity of copper.
- Mon Mar 04, 2019 4:55 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Delta G rules
- Replies: 8
- Views: 737
Re: Delta G rules
delta g>0 it is nonspontaneous. When delta g<0 it is spontaneous. And when it is equal to zero it is at equilibrium.
- Mon Mar 04, 2019 4:53 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Nernst
- Replies: 6
- Views: 535
Re: Nernst
You can use either or. I believe log is used more frequently with PH.
- Mon Mar 04, 2019 4:52 pm
- Forum: General Rate Laws
- Topic: Rate Law Formula
- Replies: 2
- Views: 318
Re: Rate Law Formula
I believe in 14B they work for every reaction without exception
- Sun Feb 24, 2019 10:46 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: K>1
- Replies: 2
- Views: 279
Re: K>1
K will be greater than one when there are more products in the mixture.
- Sun Feb 24, 2019 10:45 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Spontaneous?
- Replies: 13
- Views: 1526
Re: Spontaneous?
You can determine if it’s spontaneous depending on whether delta G is negativeness or not.
- Sun Feb 24, 2019 10:43 pm
- Forum: Balancing Redox Reactions
- Topic: Salt Bridge
- Replies: 5
- Views: 430
Re: Salt Bridge
The importance of it is to maintain charge balance.
- Wed Feb 20, 2019 1:14 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Reverse Reaction
- Replies: 8
- Views: 763
Re: Reverse Reaction
The reverse reactions is simply the inverse of the forward reaction, which for constant K would be p/r
- Wed Feb 20, 2019 1:12 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: O2
- Replies: 5
- Views: 504
Re: O2
O2 is just a naturally occurring compound and that is why it’s 0.
- Wed Feb 20, 2019 1:12 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Units of Gibbs Free Energy
- Replies: 5
- Views: 613
Re: Units of Gibbs Free Energy
Extensive because energy depends on its measure.
- Mon Feb 18, 2019 5:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Polyprotic Acids
- Replies: 5
- Views: 510
Re: Polyprotic Acids
You have to express the conjugate acid of the acids that you are given.
- Mon Feb 18, 2019 5:54 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Battery
- Replies: 5
- Views: 492
Re: Battery
In my opinion I believe due to certain factors it is a closed system.
- Mon Feb 18, 2019 5:53 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy
- Replies: 3
- Views: 426
Re: Entropy
Gas has the highest entropy because it’s state has the highest measure of disorder. Liquids and solids also have entropy but it’s not as great as gas.
- Sun Feb 10, 2019 4:55 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Energy
- Replies: 5
- Views: 735
Re: Energy
A reaction has reached equilibrium when the reaction has stopped progressing, so that the amount of reactants that have turned into products remains constant, and the amount of reactants left over stays constant. The equilibrium constant is the ratio of products to reactants when the reaction has re...
- Sun Feb 10, 2019 4:52 pm
- Forum: Phase Changes & Related Calculations
- Topic: Trouton's Rule
- Replies: 2
- Views: 402
Re: Trouton's Rule
Trouton's rule states that the entropy of vaporization is almost the same value, about 85–88 J K−1 mol−1, for various kinds of liquids at their boiling points. The entropy of vaporization is defined as the ratio between the enthalpy of vaporization and the boiling temperature.
- Sun Feb 10, 2019 4:51 pm
- Forum: Concepts & Calculations Using Second Law of Thermodynamics
- Topic: Negative q
- Replies: 7
- Views: 2718
Re: Negative q
When there is a negative q, heat id negative which means it’s being released.
- Mon Feb 04, 2019 1:12 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: isothermal expansion
- Replies: 2
- Views: 324
Re: isothermal expansion
The expansion of air under constant temperature. Since the air does work on expanding, it loses heat; consequently, heat must be added to the air to maintain it at constant temperature.
- Mon Feb 04, 2019 1:09 pm
- Forum: Phase Changes & Related Calculations
- Topic: Heat and Condensation
- Replies: 9
- Views: 893
Re: Heat and Condensation
Condensation, changing from a gas to liquid state, is releasing energy.
- Mon Feb 04, 2019 1:02 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Combustion of Glucose
- Replies: 2
- Views: 337
Re: Combustion of Glucose
The reactions only pressure was atmospheric which was constant. This is because it was an open reaction.
- Sun Jan 27, 2019 8:33 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: endothermic vs exothermic
- Replies: 6
- Views: 797
Re: endothermic vs exothermic
An endothermic reaction takes place when energy is absorbed from surroundings in the form of heat, and exothermic is when energy is released from the system into the surroundings.
- Sun Jan 27, 2019 8:32 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: ICE
- Replies: 19
- Views: 1424
Re: ICE
E stands for equilibrium concentration.
- Sun Jan 27, 2019 8:25 pm
- Forum: Phase Changes & Related Calculations
- Topic: Steam
- Replies: 7
- Views: 637
Re: Steam
Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation.
- Mon Jan 21, 2019 4:32 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: pH of acids
- Replies: 13
- Views: 3494
Re: pH of acids
It's just like a trend. Lower ph equates stronger acids while higher ones are weaker.
- Mon Jan 21, 2019 4:29 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Salt
- Replies: 4
- Views: 405
Re: Salt
Being aware of the strengths of acids and bases can help determine salts.
- Mon Jan 21, 2019 4:27 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Percentage Protonation
- Replies: 2
- Views: 159
Re: Percentage Protonation
The value would simply be the equilibrium value divided by the initial value. I hope that helps!
- Sun Jan 13, 2019 3:06 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Solving for K
- Replies: 7
- Views: 443
Re: Solving for K
A go to tip is to use brackets when you are dealing with concentration.
- Sun Jan 13, 2019 3:05 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: True or False regarding reaction mixture [ENDORSED]
- Replies: 10
- Views: 736
Re: True or False regarding reaction mixture [ENDORSED]
Yes, you are correct.
- Sun Jan 13, 2019 3:04 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Exothermic Reactions
- Replies: 9
- Views: 790
Re: Exothermic Reactions
So if the sum of the enthalpies of the reactants is greater than the products, the reaction will be exothermic.
- Mon Dec 03, 2018 7:02 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: what is a ligand?
- Replies: 8
- Views: 854
Re: what is a ligand?
a ligand is an ion or molecule that binds to a central metal atom to form a coordination complex.
- Mon Dec 03, 2018 7:00 pm
- Forum: Amphoteric Compounds
- Topic: Definition
- Replies: 5
- Views: 450
Re: Definition
An amphoteric compound is one that can react with both acids and bases.
- Mon Dec 03, 2018 6:58 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Degeneracy
- Replies: 6
- Views: 667
Re: Degeneracy
Degenerate orbitals are orbitals with the same energy. This degeneracy can sometimes be "lifted" by external electric or magnetic fields.
Re: ligands
A ligand is an ion or molecule attached to a metal atom by coordinate bonding. Use the textbook chart to name them! Good luck!
- Thu Nov 29, 2018 4:04 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Formula: Central Atom
- Replies: 4
- Views: 411
Re: VSEPR Formula: Central Atom
Yes, I beleive the central atom can be more than one atom. The text book covers VSEPR formula!
- Tue Nov 27, 2018 11:19 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3000832
Re: Post All Chemistry Jokes Here
Q: What element is a girl's future best friend?
A: Carbon.
A: Carbon.
- Tue Nov 27, 2018 11:11 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Angle Distorted
- Replies: 4
- Views: 381
Re: Angle Distorted
Lone pairs cause distortion in bond angles.
- Tue Nov 27, 2018 11:03 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Seesaw Shape Bond Angles
- Replies: 8
- Views: 725
Re: Seesaw Shape Bond Angles
Seesaw has 5 charge clouds, 4 bonds, and one lone pair giving it angles 90 and 120 degrees.
- Tue Nov 27, 2018 11:01 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar vs. Non-polar
- Replies: 6
- Views: 609
Re: Polar vs. Non-polar
A good trick to distinguish polar and no polar is by drawing a Lewis structure and using the following rules.
1.It is non polar if there are no lone pairs and if all the attached structures are the same.
1.It is non polar if there are no lone pairs and if all the attached structures are the same.
- Wed Nov 21, 2018 9:02 pm
- Forum: Ionic & Covalent Bonds
- Topic: delta positive delta negative
- Replies: 15
- Views: 2241
Re: delta positive delta negative
The acceptor tends to be delt negative while the donor is usually delta positive.
- Wed Nov 21, 2018 8:59 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 6
- Views: 508
Re: Hybridization
In chemistry, hybridization is the concept of mixing atomic orbitals into new hybrid orbitals
suitable for the pairing of electrons to form chemical bonds in valence bond theory.
suitable for the pairing of electrons to form chemical bonds in valence bond theory.
- Wed Nov 21, 2018 8:56 pm
- Forum: Hybridization
- Topic: bonds
- Replies: 4
- Views: 158
Re: bonds
A sigma bond is a single bond and becomes a pi bond when another bond is added.
- Sun Nov 18, 2018 1:54 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Angular vs. Bent
- Replies: 7
- Views: 2020
Re: Angular vs. Bent
The names are synonymous, there is no difference. The term "bent" or “angular” can be applied to certain molecules to describe their molecular geometry.
- Sun Nov 18, 2018 1:52 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 16
- Views: 1159
Re: Bond Angles
You should generally be familiar with bond angles but i do not think I️t is completely necessary to memorize them!
- Sun Nov 18, 2018 1:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Dipole-Dipole forces
- Replies: 4
- Views: 474
Re: Dipole-Dipole forces
Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule. Dipole-dipole forces have strengths that range from 5 kJ to 20 kJ per mole. They are much weaker than ionic or covalent bonds and have a significant effect only w...
- Thu Nov 08, 2018 3:37 pm
- Forum: Resonance Structures
- Topic: Radicals
- Replies: 11
- Views: 1374
Re: Radicals
In chemistry, a radical is an atom, molecule, or ion that has an unpaired valence electron. With some exceptions, these unpaired electrons make radicals highly chemically reactive. Many radicals spontaneously dimerize. Most organic radicals have short lifetimes.
- Thu Nov 08, 2018 3:36 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: Difference between the bonds
- Replies: 4
- Views: 595
Re: Difference between the bonds
A dipole-induced dipole attraction is a weak attraction that results when a polar molecule induces a dipole in an atom or in a nonpolar molecule by disturbing the arrangement of electrons in the nonpolar species.
- Thu Nov 08, 2018 3:24 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bond Length
- Replies: 8
- Views: 585
Re: Bond Length
The length of the bond is determined by the number of bonded electrons (the bond order). The higher the bond order, the stronger the pull between the two atoms and the shorter the bond length. Generally, the length of the bond between two atoms is approximately the sum of the covalent radii of the t...
- Sat Nov 03, 2018 11:45 pm
- Forum: Properties of Electrons
- Topic: Orbitals
- Replies: 5
- Views: 770
Re: Orbitals
There are 3 orbitals in the 4p subshell and in fact every p subshell has 3 orbitals!
- Sat Nov 03, 2018 11:42 pm
- Forum: Properties of Light
- Topic: Standard Units
- Replies: 8
- Views: 762
Re: Standard Units
Wavelength or lambda is measured in meters per second.
- Sat Nov 03, 2018 11:39 pm
- Forum: Photoelectric Effect
- Topic: Kinetic energy
- Replies: 11
- Views: 3274
Re: Kinetic energy
We use it to only find kinetic energy!
- Sun Oct 28, 2018 9:19 pm
- Forum: DeBroglie Equation
- Topic: De Broglie
- Replies: 12
- Views: 1404
Re: De Broglie
de Broglie Equation Definition. λ = h/mv, where λ is wavelength, h is Planck's constant, m is the mass of a particle, moving at a velocity v. de Broglie suggested that particles can exhibit properties of waves.
- Sun Oct 28, 2018 9:17 pm
- Forum: Properties of Light
- Topic: Speed of Light
- Replies: 12
- Views: 935
Re: Speed of Light
In our studies currently I do not beleive an anything can be faster than the speed of light!
- Sun Oct 28, 2018 9:15 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Degeneracy
- Replies: 7
- Views: 488
Re: Degeneracy
Degeneracy of an orbital refers to "same energy level". Degenerate" refers to a set of orbitals.
- Sat Oct 20, 2018 4:50 pm
- Forum: Properties of Light
- Topic: Atomic Spectra
- Replies: 3
- Views: 262
Atomic Spectra
In an atomic emission spectra what does one line or wavelength represent?
- Sat Oct 20, 2018 4:49 pm
- Forum: Properties of Light
- Topic: Atomic Spectra
- Replies: 1
- Views: 231
Atomic Spectra
In atomic absorbtion spectroscopy are all wavelengths of light absorbed?
- Sat Oct 20, 2018 4:47 pm
- Forum: Properties of Light
- Topic: Atomic Spectra
- Replies: 1
- Views: 140
Atomic Spectra
What is the right description for the experiment setup in a spectroscopic ecperiment using a sample of hydrogen gas atoms?
- Fri Oct 12, 2018 4:16 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 1
- Views: 91
Photoelectric Effect
Does the photoelectric experiment need to be done under a vacuum?
- Fri Oct 12, 2018 4:15 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 2
- Views: 256
Photoelectric Effect
Are electrons always ejected or are they ejected under certain circumstances. If someone can clear this up for me I would be Grateful.
- Fri Oct 12, 2018 4:14 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 2
- Views: 297
Photoelectric Effect
If 1 million high energy photons hit a metal surface what is the maximum number of electrons that could be ejected from the metal surface? Would it be .5 milllion and if so why?
- Thu Oct 04, 2018 6:24 pm
- Forum: Limiting Reactant Calculations
- Topic: Actual yield [ENDORSED]
- Replies: 4
- Views: 392
Actual yield [ENDORSED]
Does the actual yield refer to the amount of reactants remaining after a reaction is completed?
- Thu Oct 04, 2018 6:22 pm
- Forum: Limiting Reactant Calculations
- Topic: Mass of products/Reactants [ENDORSED]
- Replies: 3
- Views: 222
Mass of products/Reactants [ENDORSED]
Can the mass of the products be greater than the total mass of the reactants. If so can you explain to me the logic behind it. Thanks
- Thu Oct 04, 2018 6:19 pm
- Forum: Limiting Reactant Calculations
- Topic: multiple limiting reactants
- Replies: 9
- Views: 832
multiple limiting reactants
Can a reaction have more than one limiting reactant and why or why not? I feel like if the reactants are in the same phsyical state than it is possible. If someone can clairfy, that would be gretaly appreciated.