## 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: 129

### 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: 368

### 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: 53

### 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: 339

### 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: 333

### 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: 415

### 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.
Tue Mar 12, 2019 2:07 pm
Forum: Phase Changes & Related Calculations
Topic: 4.18J or 0.38J
Replies: 8
Views: 415

### 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.
Mon Mar 04, 2019 4:55 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Delta G rules
Replies: 8
Views: 171

### 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: 117

### 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: 81

### 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: 51

### 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: 280

### 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: 105

### 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: 203

### 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: 94

### 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: 154

### 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: 135

### 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: 134

### 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: 72

### 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: 199

### 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: 81

### 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: 241

### 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: 104

### 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: 206

### 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: 117

### 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: 194

### 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: 419

### Re: ICE

E stands for equilibrium concentration.
Sun Jan 27, 2019 8:25 pm
Forum: Phase Changes & Related Calculations
Topic: Steam
Replies: 7
Views: 157

### 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: 376

### 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: 106

### 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: 33

### 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: 149

### 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: 178

### 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: 287

### 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: 234

### 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: 131

### 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: 357

### Re: Degeneracy

Degenerate orbitals are orbitals with the same energy. This degeneracy can sometimes be "lifted" by external electric or magnetic fields.
Thu Nov 29, 2018 4:09 pm
Forum: Naming
Topic: ligands
Replies: 2
Views: 89

### 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: 136

### 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: 7951
Views: 1121077

### Re: Post All Chemistry Jokes Here

Q: What element is a girl's future best friend?
A: Carbon.
Tue Nov 27, 2018 11:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Angle Distorted
Replies: 4
Views: 121

### 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: 226

### 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: 177

### 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.
Wed Nov 21, 2018 9:02 pm
Forum: Ionic & Covalent Bonds
Topic: delta positive delta negative
Replies: 15
Views: 503

### 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: 168

### 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.
Wed Nov 21, 2018 8:56 pm
Forum: Hybridization
Topic: bonds
Replies: 4
Views: 66

### 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: 1207

### 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: 276

### 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: 147

### 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
Replies: 11
Views: 542

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: 165

### 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: 190

### 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: 382

### 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: 242

### 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: 2343

### 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: 617

### 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: 311

### 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: 148

### 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: 118

### 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: 84

### 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: 113

### 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: 51

### 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: 99

### 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: 96

### 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: 233

### 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: 100

### 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: 218

### 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.