The w for Kw means it is the equilibrium constant for water.
Ka times Kb is also equal to Kw, which equals to [H30+][OH-].
Search found 102 matches
- Mon Mar 16, 2020 2:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kw and other constants
- Replies: 9
- Views: 681
- Mon Mar 16, 2020 2:51 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Approximating X
- Replies: 13
- Views: 768
Re: Approximating X
ff the K value is smaller than 5% aka 10^-4, then x can be approximated
- Tue Mar 10, 2020 7:01 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Catalysts and Rate Law
- Replies: 4
- Views: 299
Re: Catalysts and Rate Law
Catalysis is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst
- Tue Mar 10, 2020 6:14 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Ka Kb
- Replies: 11
- Views: 635
Re: Ka Kb
Ka - Acids
Kb - Bases
Kb - Bases
- Tue Mar 10, 2020 6:10 pm
- Forum: Student Social/Study Group
- Topic: The Final
- Replies: 5
- Views: 484
The Final
Since UCLA officially offered finals remotely, how will the exam be now?
- Tue Mar 10, 2020 5:57 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Rate of Change
- Replies: 1
- Views: 140
Rate of Change
How does the rate of change of one species in a reaction relate to that of another species?
- Tue Mar 10, 2020 5:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: ENDGAME Review Session
- Replies: 71
- Views: 5467
Re: ENDGAME Review Session
Thank you King Lyndon you da best :)
- Mon Mar 09, 2020 12:05 am
- Forum: Second Order Reactions
- Topic: [A] v. Time
- Replies: 27
- Views: 1144
Re: [A] v. Time
It would be linear
- Mon Mar 09, 2020 12:02 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: galvanic vs electrolytic
- Replies: 12
- Views: 813
Re: galvanic vs electrolytic
Electrolytic cells - non-spontaneous, convert electric energy into chemical energy
Galvanic cells - spontaneous, convert chemical energy into electric energy
Galvanic cells - spontaneous, convert chemical energy into electric energy
- Sun Mar 08, 2020 11:54 pm
- Forum: Reaction Mechanisms, Reaction Profiles
- Topic: Exothermic vs. Endothermic
- Replies: 14
- Views: 921
Re: Exothermic vs. Endothermic
A reaction is exothermic when the reactants have more energy than products. Vice verso for endothermic.
- Thu Mar 05, 2020 2:21 am
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Standard Cell Potential and Equilibrium
- Replies: 2
- Views: 217
Standard Cell Potential and Equilibrium
What is the relationship between standard cell potential and equilibrium constant of a reaction?
- Wed Mar 04, 2020 5:16 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Variables
- Replies: 3
- Views: 217
Variables
What does each variable in the Nernst Equation represent?
- Wed Mar 04, 2020 5:15 pm
- Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
- Topic: Concentration Cell
- Replies: 7
- Views: 473
Concentration Cell
What is a concentration cell? How does it work? What is an example of one?
- Sun Mar 01, 2020 10:43 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Metal in a Solution
- Replies: 3
- Views: 270
Metal in a Solution
How can you predict if a metal will dissolve in a solution?
- Sun Mar 01, 2020 10:38 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Free Energy and Cell Potential Relationship
- Replies: 3
- Views: 256
Free Energy and Cell Potential Relationship
What is the relationship between free energy and cell potential? What is the equation and how is it used?
- Thu Feb 27, 2020 11:11 pm
- Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
- Topic: Work and Cell Potential Relationship
- Replies: 3
- Views: 232
Work and Cell Potential Relationship
What is the relationship between work and cell potential? What is the equation?
- Thu Feb 27, 2020 11:02 pm
- Forum: Balancing Redox Reactions
- Topic: Direction of Reaction
- Replies: 3
- Views: 234
Direction of Reaction
How can you predict the spontaneous direction of a reaction using standard reduction potentials?
- Wed Feb 26, 2020 4:24 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Standard Cell Potential
- Replies: 3
- Views: 259
Standard Cell Potential
What is a standard cell potential? How do you calculate it given the half-reactions for the cell and the standard potential?
- Wed Feb 26, 2020 4:18 pm
- Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
- Topic: Electrochemical Series
- Replies: 6
- Views: 519
Electrochemical Series
What is the electrochemical series? What is the information used for?
- Tue Feb 25, 2020 5:16 pm
- Forum: Balancing Redox Reactions
- Topic: Chemical Equation
- Replies: 1
- Views: 139
Chemical Equation
Given the description of a cell, how do you write the balanced chemical equation for a redox equation?
- Tue Feb 25, 2020 5:11 pm
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Anode and Cathode
- Replies: 4
- Views: 354
Anode and Cathode
What is an anode and a cathode? How do you identify the direction of flow?
- Mon Feb 24, 2020 10:47 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Electromotive Force
- Replies: 3
- Views: 314
Electromotive Force
What is electromotive force? Why does it represent the maximum potential difference?
- Mon Feb 24, 2020 10:44 am
- Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
- Topic: Galvanic/Voltaic Cells
- Replies: 4
- Views: 273
Galvanic/Voltaic Cells
What is a galvanic/voltaic cell? How does it work?
- Fri Feb 14, 2020 4:14 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Delta U = n*Cv,m*deltaT
- Replies: 7
- Views: 2518
Re: Delta U = n*Cv,m*deltaT
For constant volume, Cv is used.
For constant pressure, Cp is used.
For constant pressure, Cp is used.
- Fri Feb 14, 2020 4:09 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Cv vs Cp
- Replies: 17
- Views: 929
Re: Cv vs Cp
Cv = Constant volume
Cp = Constant pressure
Cp = Constant pressure
- Fri Feb 14, 2020 4:08 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K
- Replies: 12
- Views: 645
Re: K
Solids and liquids are always excluded regarding K and Q.
- Tue Feb 11, 2020 12:34 am
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Delta H and Delta S
- Replies: 3
- Views: 290
Delta H and Delta S
How is delta S related to delta H for a change at a constant temperature and pressure? What is their relationship?
- Thu Feb 06, 2020 4:56 pm
- Forum: Gibbs Free Energy Concepts and Calculations
- Topic: Energy Change
- Replies: 4
- Views: 185
Energy Change
How does the Gibbs free energy change process relate to the direction of spontaneous reaction?
- Thu Feb 06, 2020 4:55 pm
- Forum: Entropy Changes Due to Changes in Volume and Temperature
- Topic: Entropy Changes
- Replies: 2
- Views: 55
Entropy Changes
How does temperature, volume, state of matter affect the entropy of a substance? Why?
- Wed Feb 05, 2020 10:34 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Heat Output
- Replies: 1
- Views: 116
Heat Output
How do you determine the heat output of a reaction given the temperature change of a calorimeter?
- Wed Feb 05, 2020 10:24 am
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: ∆U and ∆H
- Replies: 6
- Views: 256
∆U and ∆H
What is ∆U and ∆H? What are they used for? How are they related?
- Wed Feb 05, 2020 10:23 am
- Forum: Phase Changes & Related Calculations
- Topic: Environment
- Replies: 4
- Views: 214
Environment
What is the environmental impact of burning fossils, and the use of alternative fuels as an energy source?
- Mon Feb 03, 2020 11:02 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: First Law
- Replies: 6
- Views: 140
First Law
What is the first law of thermodynamics? How is it used and why?
- Mon Feb 03, 2020 11:01 am
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Thermodynamic Systems
- Replies: 3
- Views: 150
Thermodynamic Systems
What are the three different types of thermodynamic systems?
- Wed Jan 29, 2020 8:09 pm
- Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
- Topic: Heat Capacity
- Replies: 3
- Views: 141
Heat Capacity
What are the meanings of heat capacity and specific heat capacity?
- Wed Jan 29, 2020 8:07 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Standard Subtance
- Replies: 3
- Views: 115
Standard Subtance
What is the standard state of a substance? When is a substance in its standard state?
- Tue Jan 28, 2020 3:44 pm
- Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
- Topic: Enthalpy
- Replies: 2
- Views: 202
Enthalpy
How does Hess's Law depend on the fact that enthalpy is a state property?
- Tue Jan 28, 2020 3:40 pm
- Forum: Phase Changes & Related Calculations
- Topic: Burns
- Replies: 4
- Views: 179
Burns
why does steam at 100 degrees C cause a worse burn than boiling water at 100 degrees C?
- Fri Jan 24, 2020 8:25 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Q and K
- Replies: 4
- Views: 146
Q and K
What are differences between K and Q? What does it mean when one is larger/smaller than the other?
- Thu Jan 23, 2020 2:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Hydroxide/Hydronium Ions
- Replies: 2
- Views: 62
Hydroxide/Hydronium Ions
How do you calculate hydroxide ion concentration from a hydronium ion concentration? and vice versa?
- Wed Jan 22, 2020 10:07 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Acidity Constant
- Replies: 4
- Views: 91
Acidity Constant
How does the acidity constant of an acid relate to the basicity constant of its conjugate base?
- Wed Jan 22, 2020 2:45 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Percentage Ionization
- Replies: 2
- Views: 73
Percentage Ionization
How do we calculate the percentage ionization of a weak acid or base?
- Wed Jan 22, 2020 2:44 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Conjugate Seesaw
- Replies: 3
- Views: 166
Conjugate Seesaw
What is the conjugate seesaw? How do we use it in problem solving and calculations?
- Thu Jan 16, 2020 1:30 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Solids and liquids
- Replies: 3
- Views: 48
Solids and liquids
Why do we omit solids and liquids when writing for Kc and Kp?
- Tue Jan 14, 2020 5:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Autoprotolysis
- Replies: 8
- Views: 191
Autoprotolysis
Can someone explain what autoprotolysis is? When does it occur? Why and How?
- Tue Jan 14, 2020 5:27 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Weak Acids/Bases
- Replies: 2
- Views: 71
Weak Acids/Bases
Why do solutions of weak acids have higher pH values than solutions of strong acids at the same concentration?
- Tue Jan 14, 2020 1:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Strong Acids/Bases
- Replies: 4
- Views: 146
Strong Acids/Bases
What are the differences between solutions of strong and weak acids and bases?
- Mon Jan 13, 2020 10:21 am
- Forum: Ideal Gases
- Topic: Variables
- Replies: 3
- Views: 98
Variables
What does each variable/letter represent in the equation PV = nRT?
- Thu Jan 09, 2020 3:20 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Direction
- Replies: 4
- Views: 115
Direction
How does the value of the reaction quotient allow the direction of non-equilibrium reaction to be predicted?
- Wed Jan 08, 2020 2:22 pm
- Forum: Ideal Gases
- Topic: K and Q
- Replies: 13
- Views: 306
K and Q
When do you use Q and when do you use K? What are the differences between them?
- Wed Jan 08, 2020 2:17 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Reaction Direction
- Replies: 5
- Views: 237
Reaction Direction
How do you determine what direction of the reaction goes given K and the concentrations of all reactants and products?
- Mon Jan 06, 2020 5:31 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Equilibrium Constant
- Replies: 8
- Views: 375
Equilibrium Constant
When do you write the equilibrium constant as Kc? and when do you write the equilibrium constant as Kp?
- Sat Dec 07, 2019 4:17 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Calculating pH
- Replies: 1
- Views: 177
Calculating pH
Can someone explain step by step on how to calculate the pH of acids and bases?
- Sat Dec 07, 2019 4:13 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Acidic Rain
- Replies: 3
- Views: 362
Acidic Rain
Why can rain be acidic? How do you reduce acidic rain?
- Sat Dec 07, 2019 3:51 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strong Acids
- Replies: 3
- Views: 278
Strong Acids
What are all the strong acids and strong bases we need to know?
- Sat Dec 07, 2019 3:38 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric vs. Amphoprotic
- Replies: 1
- Views: 266
Amphoteric vs. Amphoprotic
What is the difference between amphoteric and amphoprotic?
- Sat Dec 07, 2019 3:36 pm
- Forum: Industrial Examples
- Topic: Chemotherapy
- Replies: 22
- Views: 1556
Chemotherapy
What are well-known examples of coordination compounds used as chemotherapy drugs?
- Sat Dec 07, 2019 3:35 pm
- Forum: Naming
- Topic: Biological Functions
- Replies: 2
- Views: 147
Biological Functions
What are the biological functions of naturally occurring coordination compounds?
- Mon Dec 02, 2019 12:05 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Explain VSEPR conceptually
- Replies: 12
- Views: 774
Re: Explain VSEPR conceptually
VESPR is for naming models that are in 3D, how lone pairs repulse each other, and how the molecule is arranged.
- Sun Dec 01, 2019 11:59 pm
- Forum: Bronsted Acids & Bases
- Topic: Definition
- Replies: 3
- Views: 86
Re: Definition
For the Bronstead-Lowry definition:
Bases accept H+
Acids give away H+
Bases accept H+
Acids give away H+
Re: oxidation
Oxidation is how many electrons is lost from the anion.
Re: Naming
Yes because that is the rule for naming molecules. :)
- Sun Dec 01, 2019 11:54 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs linear
- Replies: 56
- Views: 4047
Re: Bent vs linear
A linear molecule has a 180 degree angle while a bent has less than a 120 degree angle
- Sun Nov 24, 2019 8:41 pm
- Forum: Hybridization
- Topic: Basics
- Replies: 2
- Views: 110
Re: Basics
Hybridization is when atomic orbitals are mixed into hybrid orbitals so that chemical bonding is easier. Basically, electrons can move into new hybrid orbitals and these orbitals are used to create bonds with other hybrid orbitals in different atoms in order to for a molecule.
- Sun Nov 24, 2019 7:54 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent vs linear
- Replies: 56
- Views: 4047
Re: Bent vs linear
Bent molecules have a lone pair, aka "E", compared to linear molecules do not. The lone pairs repel the electrons on the bonded atoms.
- Sun Nov 24, 2019 7:29 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Intermolecular forces
- Replies: 5
- Views: 338
Intermolecular forces
What are the different types of Intermolecular forces/forces? How do you identify them?
- Sun Nov 24, 2019 7:20 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma and Pi Bonds
- Replies: 7
- Views: 407
Sigma and Pi Bonds
How can you tell the difference between a sigma and a pi bond? What are they?
- Sun Nov 17, 2019 8:33 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 7
- Views: 423
Bond Angles
How and why do lone pairs affect the bond angles in a molecule, cation, or anion?
- Fri Nov 15, 2019 4:23 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 3
- Views: 258
Hybridization
What is hybridization? And how does it arise from atomic orbitals?
- Thu Nov 14, 2019 5:57 pm
- Forum: Dipole Moments
- Topic: Polarity
- Replies: 6
- Views: 295
Polarity
How are you able to tell if a molecule is polar or nonpolar?
- Thu Nov 14, 2019 3:41 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2.27
- Replies: 1
- Views: 83
2.27
I am confused particularly with part b and c. What is a radical? How do you go about ranking the increasing HCH bond angles as well? "(a) Draw a Lewis structure for each of the following species: CH3+ ; CH4 ; CH3- 2 ; CH2 ; CH2 2+ ; CH2 2- . (b) Identify each as a radical or not. (c) Rank them ...
- Thu Nov 14, 2019 3:13 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2F 9
- Replies: 1
- Views: 60
2F 9
I am confused with this question. What is a hybrid orbital? How do I identify one?
"Identify the hybrid orbitals used by the phosphorus atom in each of the following species: (a) PCl 4 1; (b) PCl 6 2; (c) PCl 5; (d) PCl 3"
"Identify the hybrid orbitals used by the phosphorus atom in each of the following species: (a) PCl 4 1; (b) PCl 6 2; (c) PCl 5; (d) PCl 3"
- Sun Nov 10, 2019 11:58 pm
- Forum: Ionic & Covalent Bonds
- Topic: Bond Strength
- Replies: 8
- Views: 481
Bond Strength
Which bonds are stronger, covalent or ionic? What is the conceptual reasoning behind it?
- Sun Nov 10, 2019 7:18 pm
- Forum: Resonance Structures
- Topic: Orbitals
- Replies: 4
- Views: 350
Re: Orbitals
A delocalized electron is an electron in an atom, ion or molecule not associated with any single atom or a single covalent bond.
- Sun Nov 10, 2019 6:42 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionization Energy
- Replies: 5
- Views: 554
Ionization Energy
What is the ionization energy periodic trend? And what is the conceptual reasoning behind it?
- Sun Nov 10, 2019 2:35 am
- Forum: Bond Lengths & Energies
- Topic: Bond Lengths
- Replies: 3
- Views: 121
Bond Lengths
Which bonds are the shortest and which are the longest? What is the reasoning behind it?
- Fri Nov 08, 2019 3:47 pm
- Forum: Electronegativity
- Topic: Periodic Trend
- Replies: 13
- Views: 736
Periodic Trend
What is the periodic trend for electronegativity? Can someone explain why it is the way it is conceptually?
- Fri Nov 08, 2019 3:42 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Shortcut
- Replies: 3
- Views: 120
Formal Charge Shortcut
What's an easy way to find the formal charge without having to write down the equation and plugin the numbers every time?
- Thu Oct 31, 2019 1:30 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge
- Replies: 5
- Views: 208
Formal Charge
How would you know when to use the formal charge equation? In what situations would it be used in?
- Thu Oct 31, 2019 1:21 pm
- Forum: Lewis Structures
- Topic: octet exceptions
- Replies: 5
- Views: 273
Re: octet exceptions
Molecules that have exceptions to the octet rule are molecules with an odd number of electrons (ex. NO) , molecules in which an atom or more than one atom have more than 8 electrons (ex. SF6) , and molecules in which an atom or more than one atom have less than 8 electrons (ex. BCl3) .
- Thu Oct 31, 2019 1:15 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: electron shells
- Replies: 1
- Views: 82
Re: electron shells
Electrons in an orbital is paired when there are two electron with a spin up and spin down in the same orbital. Electrons are unpaired when there is only one electron with a spin up/down in an orbital, as shown in the photo below.
- Thu Oct 31, 2019 1:11 pm
- Forum: Resonance Structures
- Topic: Difference between Resonance and Lewis structures
- Replies: 5
- Views: 455
Re: Difference between Resonance and Lewis structures
Resonance is when some lewis structures have multiple bonds in different places of the structure. For example, for the lewis structure for (CO3)2- , the double bond can moved to any of the oxygen atoms.
- Fri Oct 25, 2019 3:47 pm
- Forum: Trends in The Periodic Table
- Topic: Stable Structures
- Replies: 5
- Views: 346
Re: Stable Structures
Yes, it is when the formal charge is equal to 0 that shows the structure is stable. To find out the formal charge of a structure, you must use this equation:
FC = V - (L + S/2)
FC = V - (L + S/2)
- Fri Oct 25, 2019 3:33 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 1D. 23
- Replies: 1
- Views: 77
Re: 1D. 23
Try and use this chart to help you answer these questions!
- Fri Oct 25, 2019 3:26 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: 1D. 11 prob
- Replies: 3
- Views: 95
Re: 1D. 11 prob
Try and use this chart to help you with future problems like these!
- Fri Oct 25, 2019 1:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: Resonance
- Replies: 7
- Views: 314
Resonance
Can someone explain what resonance is and what the importance of it is?
- Fri Oct 25, 2019 1:08 pm
- Forum: Lewis Structures
- Topic: Double Bonds
- Replies: 6
- Views: 148
Re: Double Bonds
To know when to use a double bond, you must find the formal charge by using the equation, FC = V - (L + S/2). When FC does not equal to 0, then you must use a double bond to make the FC equal to 0.
- Tue Oct 22, 2019 6:33 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1 B27
- Replies: 5
- Views: 488
1 B27
I am confused on where to start for this problem. What are the steps to find the minimum uncertainty? What do i do with the given numbers?
"A bowling ball of mass 8.00 kg is rolled down a bowling alley lane at 5.00 ± 5.0 m.s?" What is the minimum uncertainty in its position?"
"A bowling ball of mass 8.00 kg is rolled down a bowling alley lane at 5.00 ± 5.0 m.s?" What is the minimum uncertainty in its position?"
- Wed Oct 16, 2019 11:49 pm
- Forum: Trends in The Periodic Table
- Topic: calculating the state
- Replies: 3
- Views: 190
Re: calculating the state
pz consists of two lobes intersected by the internuclear z axis. A nodal plane exists within the two lobes.
px consists of two lobes intersected by the x axis.
py consists of two lobes intersected by the y axis.
px consists of two lobes intersected by the x axis.
py consists of two lobes intersected by the y axis.
- Wed Oct 16, 2019 11:47 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: 1B 23
- Replies: 2
- Views: 105
1B 23
I am confused on where to start for this problem. What are the steps to find the velocity of a neutron of a certain wavelength? What shpuld i do first?
"What is the velocity of a neutron of wavelength 100. pm? "
"What is the velocity of a neutron of wavelength 100. pm? "
- Wed Oct 16, 2019 11:15 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Orbitals
- Replies: 4
- Views: 161
Re: Orbitals
Try using this chart to help you understand how subshells, orbitals, etc. work.
Hope this helps!
Hope this helps!
- Tue Oct 15, 2019 5:58 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: 1D 11
- Replies: 4
- Views: 296
1D 11
I am struggling with this problem. Can someone explain how to find the orbitals in subshells and what the differences are between l, m, and n?
"How many orbitals are in subshells with l equal to (a) 0; (b) 2; (c) 1; (d) 3? "
"How many orbitals are in subshells with l equal to (a) 0; (b) 2; (c) 1; (d) 3? "
- Sun Oct 13, 2019 4:40 pm
- Forum: SI Units, Unit Conversions
- Topic: Fundamentals L35
- Replies: 5
- Views: 251
Re: Fundamentals L35
The T in the question stands for "tons" . 1 ton is equal to 1,000 kg. And one kg is equal to 1,000g. To turn this into grams, you can do
2.5t x 1000kg/1t x 1000g/1kg
2.5t x 1000kg/1t x 1000g/1kg
- Thu Oct 10, 2019 3:24 pm
- Forum: Empirical & Molecular Formulas
- Topic: Converting from grams to percentage
- Replies: 11
- Views: 7573
Re: Converting from grams to percentage
To find the empirical formula, you should always turn the percentage values given to you and imagine the sample mass is 100g (Ex. 54.5% --> 54.5 grams) . Then divide by the molar mass, and divide by the smallest value (molecule must have whole atoms) .
- Thu Oct 10, 2019 3:08 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Chemical Reactions
- Replies: 20
- Views: 1069
Re: Balancing Chemical Reactions
Try to make a list of reactants and products with their respective number of molecules and balance it one by one.
- Tue Oct 08, 2019 3:54 pm
- Forum: Empirical & Molecular Formulas
- Topic: F 17
- Replies: 2
- Views: 261
F 17
I am confused on letter b for this problem. What must I do with the given molar mass to get the molecular formula? "Osmium forms a molecular compound with mass percentage composition 15.89% C, 21.18% O, and 62.93% Os. (a) What is the empirical formula of this compound? (b) From the mass spectru...
- Mon Oct 07, 2019 4:48 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: G 23
- Replies: 1
- Views: 91
G 23
I am confused on where to even start for this problem. What is the first step I should take to find the concentration of chloride ions in the solution? "In medicine it is sometimes necessary to prepare solutions with a specific concentration of a given ion. A lab technician has made up 100.0 mL...
- Thu Oct 03, 2019 12:19 am
- Forum: Limiting Reactant Calculations
- Topic: M 15
- Replies: 4
- Views: 198
M 15
I'm having trouble with letter c in particular. What steps should I take to solve the percentage yield of aluminum chloride? "Aluminum metal reacts with chlorine gas to produce aluminum chloride. In one preparation, 255 g of aluminum is placed in a container holding 535 g of chlorine gas. After...
- Wed Oct 02, 2019 10:09 pm
- Forum: Significant Figures
- Topic: When to apply sig figs?
- Replies: 4
- Views: 305
Re: When to apply sig figs?
I think Lavelle has said if i'm not mistaken only to round sig figs on your final answer.
- Wed Oct 02, 2019 9:45 pm
- Forum: Limiting Reactant Calculations
- Topic: L1 homework
- Replies: 2
- Views: 47
Re: L1 homework
Yes it is that simple! So you would 0.3/6 like you said and get 0.05 moles of Br2.