Search found 35 matches
- Sat Mar 16, 2019 8:29 pm
- Forum: First Order Reactions
- Topic: Clarification
- Replies: 2
- Views: 447
Re: Clarification
I confused myself and answered my own question as I was rephrasing: For example, you are given the concentration of a reactant that is subject to decay and asked what the concentration is after a certain amount of time. After the start of decomposition, it would be safe to assume that the concentrat...
- Sat Mar 16, 2019 7:55 pm
- Forum: First Order Reactions
- Topic: Half-Life and Rate Constant
- Replies: 1
- Views: 623
Half-Life and Rate Constant
Since we know that the higher the value of k, the faster the consumption of a reactant, can we deduce that a first order reaction with a greater rate constant has a shorter half life substance?
- Sat Mar 16, 2019 7:48 pm
- Forum: First Order Reactions
- Topic: Clarification
- Replies: 2
- Views: 447
Clarification
Since the reactant decays with time, should you just expect a concentration that is lower than the initial value?
- Sat Mar 16, 2019 4:49 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: Heat and Entropy
- Replies: 2
- Views: 401
Heat and Entropy
If a lot of energy is transferred as heat, would a lot of disorder be created in the system and would we expect a big increase in entropy?
- Tue Mar 12, 2019 10:02 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Boltzmann Equation
- Replies: 3
- Views: 738
Boltzmann Equation
How do we know when to use the Boltzmann Equation?
- Tue Mar 12, 2019 9:29 pm
- Forum: Arrhenius Equation, Activation Energies, Catalysts
- Topic: Temp Dependence and Reaction Rate
- Replies: 1
- Views: 237
Temp Dependence and Reaction Rate
How is the temperature dependence of the rate constant related to the reaction rate?
- Mon Mar 11, 2019 8:22 pm
- Forum: First Order Reactions
- Topic: Units of Rate Constant
- Replies: 5
- Views: 629
Units of Rate Constant
Is it safe to assume, when finding rate constants, that we should convert all time units to seconds?
- Mon Mar 04, 2019 9:57 pm
- Forum: General Rate Laws
- Topic: Units of Rate Constant
- Replies: 4
- Views: 477
Units of Rate Constant
How can you use units of the rate constant to identify order of the reaction?
- Mon Mar 04, 2019 9:48 pm
- Forum: General Rate Laws
- Topic: Rate of Formation vs Unique Rate of a Reaction
- Replies: 2
- Views: 358
Rate of Formation vs Unique Rate of a Reaction
What's the difference between rate of formation and unique rate of a reaction?
- Tue Feb 12, 2019 5:22 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reasonable Assumptions
- Replies: 2
- Views: 394
Reasonable Assumptions
Does anyone have a consolidated list of the assumptions we can make in calculations? For example how deltaU is 0 for isothermal processes
- Mon Feb 11, 2019 8:28 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Irreversible Expansions and Work
- Replies: 2
- Views: 315
Irreversible Expansions and Work
Do irreversible expansions always do more work than reversible expansions? If so, why?
- Mon Feb 11, 2019 8:26 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Reversible Expansion
- Replies: 2
- Views: 317
Reversible Expansion
In reversible expansion problems where w=-nRTln(V2/V1), it's more efficient to use Kelvin right?
- Mon Feb 11, 2019 8:08 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: Microstates
- Replies: 7
- Views: 1023
Microstates
How are microstates relevant in calculations of entropy?
- Thu Dec 06, 2018 8:49 pm
- Forum: Lewis Acids & Bases
- Topic: Strong Acids
- Replies: 6
- Views: 613
Strong Acids
HF would be considered a weaker acid that HI because the electrons have less space to delocalize?
- Wed Dec 05, 2018 11:11 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Calculating pH of Weak Acid
- Replies: 1
- Views: 251
Calculating pH of Weak Acid
Would the answers to calculating pH of a weak acid have poor reliability because we don't take into consideration the interactions between the ions in the solution? Or is it it small enough that we can ignore it?
- Wed Dec 05, 2018 10:39 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: Calculating pH of Acid/Base
- Replies: 1
- Views: 394
Calculating pH of Acid/Base
How do you calculate the pH of a salt solution when it can act as either an acid or a base?
- Tue Dec 04, 2018 10:09 pm
- Forum: Bronsted Acids & Bases
- Topic: Water as an Acid or Base
- Replies: 4
- Views: 513
Water as an Acid or Base
When do you know if H2O acts as an acid or base?
- Tue Dec 04, 2018 4:42 pm
- Forum: Conjugate Acids & Bases
- Topic: Determining Conjugate Acid
- Replies: 5
- Views: 871
Determining Conjugate Acid
Whenever we need to determine the conjugate acid of a base, do you just add one H+?
- Mon Dec 03, 2018 11:08 pm
- Forum: Bronsted Acids & Bases
- Topic: Water and Bronsted Acids/Bases
- Replies: 2
- Views: 316
Water and Bronsted Acids/Bases
To clarify, water is mostly just present in reactions involving bronsted acids and bronsted bases?
- Sun Dec 02, 2018 4:01 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Chemical Bonds of Nonmetals
- Replies: 2
- Views: 465
Chemical Bonds of Nonmetals
Since nonmetals rarely lose electrons in chemical reactions because their ionization energies are too high, can a nonmetal atom get enough electrons to complete its valence shell and form an anion? And does that mean that would it correspond with the configuration of the next noble gas?
- Fri Nov 30, 2018 9:02 pm
- Forum: Lewis Acids & Bases
- Topic: Differentiating Between Lewis and Bronsted
- Replies: 2
- Views: 314
Differentiating Between Lewis and Bronsted
How can you tell the difference between Lewis acids and bases and Bronsted acids and bases?
- Fri Nov 30, 2018 8:58 pm
- Forum: Bronsted Acids & Bases
- Topic: Memorizing Acids and Bases [ENDORSED]
- Replies: 2
- Views: 289
Memorizing Acids and Bases [ENDORSED]
Should strong/weak acids and bases be memorized or is there a way to identify them without memorization?
- Fri Nov 30, 2018 8:45 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Covalent Character
- Replies: 3
- Views: 1965
Covalent Character
Why does MgBr2 have greater covalent character than NaBr?
- Thu Nov 29, 2018 2:23 pm
- Forum: Hybridization
- Topic: Rating Polarity
- Replies: 3
- Views: 302
Rating Polarity
How can you tell which atoms have the greatest polarity when they are all in the same group and have the same number of valence electrons?
- Thu Nov 29, 2018 2:18 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Sigma and Pi Bonds
- Replies: 6
- Views: 920
Sigma and Pi Bonds
If a molecule given has 2 double bonds and 1 triple bond, would the number of sigma bonds be 3 and the number of pi bonds be 4?
- Thu Nov 29, 2018 2:12 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Strength
- Replies: 2
- Views: 300
Bond Strength
Why does ammonia bind stronger that H2O?
- Wed Nov 07, 2018 10:48 pm
- Forum: Bond Lengths & Energies
- Topic: Lone Pairs and Bond Strengths
- Replies: 2
- Views: 338
Lone Pairs and Bond Strengths
How does the presence of lone pairs affect bond strength?
- Thu Nov 01, 2018 11:08 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge and lone pairs
- Replies: 2
- Views: 257
Formal Charge and lone pairs
For the lone and shared pairs should I count each electron in the lone pair or count one pair as one? And would each bond count as 1 or 2 bonds?
- Wed Oct 31, 2018 11:38 pm
- Forum: Resonance Structures
- Topic: Radicals and "damaging"
- Replies: 5
- Views: 385
Radicals and "damaging"
Radicals "damage" DNA because they are highly reactive?
- Thu Oct 25, 2018 8:55 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Ionization Energy
- Replies: 3
- Views: 381
Ionization Energy
Since an s-block element has a low ionization energy, then that means that its outermost electrons can easily be lost. So an s-block element is is most likely to be a reactive metal?
- Wed Oct 24, 2018 11:08 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Indeterminacy Question
- Replies: 3
- Views: 296
Indeterminacy Question
In Chem14A, are all indeterminacy questions going to ask for the minimum?
- Tue Oct 23, 2018 10:54 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Writing an Electron Configuration Format
- Replies: 3
- Views: 366
Writing an Electron Configuration Format
Just to clarify, when writing an electron configuration of an atom, you can write it in either way:
1s^2 2s^2 2px^1 2py^1 and/or 1s^2 2s^2 2p^2
but one is just more specific in which are parallel?
1s^2 2s^2 2px^1 2py^1 and/or 1s^2 2s^2 2p^2
but one is just more specific in which are parallel?
- Thu Oct 18, 2018 8:54 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Electron Configuration: Ground vs Excited
- Replies: 1
- Views: 1014
Electron Configuration: Ground vs Excited
In what ways/how does electron configuration represent the ground state of an atom versus the excited state of an atom?
- Wed Oct 17, 2018 8:08 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg > and equal to or =
- Replies: 1
- Views: 88
Heisenberg > and equal to or =
How do we know when/if to change the greater than and equal to sign to just an equal sign in the Heisenberg Equation?
- Tue Oct 16, 2018 8:05 pm
- Forum: Properties of Light
- Topic: Wave-Like Properties Value
- Replies: 2
- Views: 195
Wave-Like Properties Value
What would you recommend the cut-off wavelength value be for deciding whether an object has wave-like properties?