## Search found 35 matches

Sat Mar 16, 2019 8:29 pm
Forum: First Order Reactions
Topic: Clarification
Replies: 2
Views: 200

### 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: 192

### 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: 200

### 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: 199

### 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: 264

### 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: 47

### 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: 120

### 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: 104

### 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: 74

### 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: 94

### 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: 88

### 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: 83

### 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: 384

### 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: 156

### 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: 94

### 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: 195

### 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: 151

### 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: 311

### 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: 85

### 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: 119

### 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: 79

### 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: 131

### 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: 334

### 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: 105

### 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: 350

### 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: 87

### 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: 80

### 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: 93

### 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: 191

### 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: 98

### 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: 180

### 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: 131

### 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?
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: 106

### 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: 46

### 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: 59

### Wave-Like Properties Value

What would you recommend the cut-off wavelength value be for deciding whether an object has wave-like properties?

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