Search found 61 matches

by Peter Nguyen 2I
Sat Mar 16, 2019 10:46 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Arrhenius Equation
Replies: 3
Views: 25

Arrhenius Equation

what is the A in the equation?
by Peter Nguyen 2I
Sat Mar 16, 2019 10:37 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: elementary steps
Replies: 3
Views: 11

elementary steps

Why can we use the stoichiometric coefficients as the order of reactants?
by Peter Nguyen 2I
Sat Mar 16, 2019 9:48 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Catalysts
Replies: 4
Views: 24

Catalysts

Are there any common catalysts we should know?
by Peter Nguyen 2I
Sun Mar 10, 2019 10:34 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: molecularity
Replies: 8
Views: 34

molecularity

what does it mean when something is bi-molecular, termolecular, etc.?
by Peter Nguyen 2I
Sun Mar 10, 2019 10:19 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Intermediate species
Replies: 2
Views: 12

Intermediate species

What is the significance of intermediate species?
by Peter Nguyen 2I
Sun Mar 10, 2019 9:50 pm
Forum: First Order Reactions
Topic: half life
Replies: 2
Views: 17

half life

In what situation would we use the half life equation?
by Peter Nguyen 2I
Sun Mar 03, 2019 7:30 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: kinetics and thermodynamics
Replies: 4
Views: 41

kinetics and thermodynamics

Which one is prevailant over the other in controlling a reaction? Are there certain conditions where thermodynamics control the reaction?
by Peter Nguyen 2I
Sun Mar 03, 2019 7:28 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: n and k
Replies: 3
Views: 26

n and k

Why do we need to determine n and k?
by Peter Nguyen 2I
Sun Mar 03, 2019 7:24 pm
Forum: General Rate Laws
Topic: Instantaneous vs unique
Replies: 1
Views: 20

Instantaneous vs unique

What is the difference between the instantaneous rate and the unique rate?
by Peter Nguyen 2I
Mon Feb 25, 2019 10:56 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Voltaic vs galvanic cell
Replies: 2
Views: 24

Voltaic vs galvanic cell

What's the difference between voltaic and galvanic cells?
by Peter Nguyen 2I
Sun Feb 24, 2019 9:25 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Signs of delta G and E
Replies: 4
Views: 35

Signs of delta G and E

For a spontaneous reaction, why does delta G have to be - and E have to be +?
by Peter Nguyen 2I
Sun Feb 24, 2019 9:23 pm
Forum: Balancing Redox Reactions
Topic: Work done
Replies: 2
Views: 20

Work done

How do you know if the work is done by the battery system?
by Peter Nguyen 2I
Sun Feb 24, 2019 9:18 pm
Forum: Balancing Redox Reactions
Topic: Salt bridge
Replies: 1
Views: 17

Salt bridge

What is the purpose of a salt bridge and a porous disc?
by Peter Nguyen 2I
Sun Feb 17, 2019 7:02 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Calculating entropy
Replies: 4
Views: 38

Calculating entropy

Why do we calculate entropy for volume change and temperature change independently?
by Peter Nguyen 2I
Sun Feb 17, 2019 7:00 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Intensive vs extensive
Replies: 4
Views: 30

Intensive vs extensive

Is gibbs free energy intensive or extensive?
by Peter Nguyen 2I
Sun Feb 17, 2019 6:58 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs free energy?
Replies: 2
Views: 21

Gibbs free energy?

What does Gibbs free energy measure?
by Peter Nguyen 2I
Sun Feb 10, 2019 3:41 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Spontaneous processes
Replies: 2
Views: 22

Spontaneous processes

Why is there an increase in entropy for any spontaneous process?
by Peter Nguyen 2I
Sun Feb 10, 2019 3:23 pm
Forum: Calculating Work of Expansion
Topic: Real processes
Replies: 2
Views: 36

Real processes

Why are all real processes irreversible?
by Peter Nguyen 2I
Sun Feb 03, 2019 6:07 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 2nd law of thermodynamics
Replies: 5
Views: 50

2nd law of thermodynamics

Can someone explain the second law of thermodynamics and how it relates to what we are doing?
by Peter Nguyen 2I
Sun Feb 03, 2019 6:01 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: isolated vs closed system
Replies: 7
Views: 79

isolated vs closed system

What's the difference between an isolated system and a closed system?
by Peter Nguyen 2I
Sun Feb 03, 2019 5:51 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: finding W
Replies: 6
Views: 57

finding W

Is the integral formula equivalent to -P(V2-V1)? can you use both to find -P delta V?
by Peter Nguyen 2I
Sun Jan 27, 2019 4:18 pm
Forum: Phase Changes & Related Calculations
Topic: Steam
Replies: 7
Views: 56

Steam

Can someone explain why steam causes more severe burns than water? I'm still a bit confused on that
by Peter Nguyen 2I
Sun Jan 27, 2019 4:16 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's law vs bond enthalpies
Replies: 1
Views: 21

Hess's law vs bond enthalpies

Will using either method yield the same answer? If not, which is the most accurate?
by Peter Nguyen 2I
Sun Jan 27, 2019 2:21 pm
Forum: Phase Changes & Related Calculations
Topic: Delta H
Replies: 11
Views: 90

Delta H

What do positive and negative delta H mean?
by Peter Nguyen 2I
Sun Jan 20, 2019 2:33 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Removing products
Replies: 10
Views: 64

Removing products

Would removing the products in an equilibrium reaction affect both Q and K or just Q?
by Peter Nguyen 2I
Sun Jan 20, 2019 2:18 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: 5% rule
Replies: 4
Views: 30

5% rule

Is it always safe to assume that any Ka that is less than 10^-3 will result in an X that is less than 5%?
by Peter Nguyen 2I
Sun Jan 20, 2019 2:10 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure
Replies: 8
Views: 82

Pressure

Does the equilibrium shift if pressure is changed? If so, why?
by Peter Nguyen 2I
Sat Jan 12, 2019 6:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Heterogeneous and homogeneous equilibria [ENDORSED]
Replies: 8
Views: 78

Heterogeneous and homogeneous equilibria [ENDORSED]

How are heterogeneous and homogeneous equilibria related to what we are learning?
by Peter Nguyen 2I
Sat Jan 12, 2019 6:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp and Kc
Replies: 1
Views: 15

Kp and Kc

What is the difference/relationship between Kp and Kc?
by Peter Nguyen 2I
Sat Jan 12, 2019 6:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium constant
Replies: 4
Views: 28

Equilibrium constant

Why does adding more products or reactants not affect the equilibrium constant?
by Peter Nguyen 2I
Sun Dec 09, 2018 12:24 am
Forum: Naming
Topic: Chloro vs Chlorito
Replies: 8
Views: 76

Chloro vs Chlorito

Is there a difference between the two? In class we use chloro but the book calls it chlorito.
by Peter Nguyen 2I
Sun Dec 09, 2018 12:11 am
Forum: Hybridization
Topic: Pi bonds
Replies: 2
Views: 39

Pi bonds

Why are pi bonds always unhybridized?
by Peter Nguyen 2I
Sat Dec 08, 2018 8:49 pm
Forum: Calculating the pH of Salt Solutions
Topic: Concentration
Replies: 1
Views: 20

Concentration

Is the concentration equivalent to the molarity of the substance?
by Peter Nguyen 2I
Sat Dec 08, 2018 8:32 pm
Forum: Biological Examples
Topic: Myoglobin and Hemoglobin
Replies: 1
Views: 36

Myoglobin and Hemoglobin

How many myoglobins make up a hemoglobin?
by Peter Nguyen 2I
Sat Dec 08, 2018 8:31 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 7
Views: 91

Cisplatin

How does Cisplatin help in chemotherapy and why can't transplatin be used?
by Peter Nguyen 2I
Sun Dec 02, 2018 8:29 pm
Forum: Naming
Topic: Polydentate Ligands
Replies: 2
Views: 19

Polydentate Ligands

How can we tell if a ligand is polydentante?
by Peter Nguyen 2I
Mon Nov 26, 2018 7:48 pm
Forum: Hybridization
Topic: Atomic Orbitals
Replies: 2
Views: 21

Atomic Orbitals

What does it mean when it says "hybridization arises from atomic orbitals"?
by Peter Nguyen 2I
Mon Nov 26, 2018 5:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T shaped
Replies: 6
Views: 51

T shaped

Why does AX3E2 make a T-shape and doesn't form a trigonal planar shape?
by Peter Nguyen 2I
Sun Nov 18, 2018 2:48 pm
Forum: Sigma & Pi Bonds
Topic: Amount of sigma bonds
Replies: 6
Views: 118

Amount of sigma bonds

In a bond between 2 atoms, can there only be one sigma bond? Are there any exceptions?
by Peter Nguyen 2I
Sun Nov 18, 2018 2:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Square Planar vs Tetrahedral
Replies: 8
Views: 86

Square Planar vs Tetrahedral

What is the difference between square planar and tetrahedral? They both have 5 atoms but why are they different shapes?
by Peter Nguyen 2I
Sun Nov 18, 2018 2:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 8
Views: 95

Lone Pairs

Can someone explain why lone pairs affect the shape of a molecule?
by Peter Nguyen 2I
Sun Nov 11, 2018 10:27 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 4
Views: 41

Molecular Shape

Is a molecule's shape solely dependent on the number of atoms involved? Do the type of atoms affect it?
by Peter Nguyen 2I
Sun Nov 04, 2018 12:46 am
Forum: Lewis Structures
Topic: Central Atom
Replies: 3
Views: 40

Central Atom

Is the central atom always the one with the lower ionization energy? Are there any exceptions?
by Peter Nguyen 2I
Sun Nov 04, 2018 12:44 am
Forum: Octet Exceptions
Topic: Copper
Replies: 10
Views: 151

Re: Copper

I believe it is that way because 3d9 has an unpaired electron which makes it unstable and 3d would rather have a full shell to stabilize it.
by Peter Nguyen 2I
Sun Nov 04, 2018 12:36 am
Forum: Bond Lengths & Energies
Topic: Bond Lengths [ENDORSED]
Replies: 2
Views: 64

Bond Lengths [ENDORSED]

Why do single bonds have longer bond lengths than double bonds?
by Peter Nguyen 2I
Sun Oct 28, 2018 4:24 pm
Forum: Ionic & Covalent Bonds
Topic: the Octet rule
Replies: 21
Views: 189

the Octet rule

When forming bonds, do atoms always try to follow the octet rule? Are there exceptions to this rule/guideline?
by Peter Nguyen 2I
Sun Oct 28, 2018 1:36 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 4s and 3d [ENDORSED]
Replies: 2
Views: 55

4s and 3d [ENDORSED]

Why do we sometimes write the 4s orbital before including the 3d orbital?
by Peter Nguyen 2I
Sun Oct 28, 2018 1:30 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy [ENDORSED]
Replies: 7
Views: 89

Ionization Energy [ENDORSED]

Why does ionization energy increase as you move to the right of the periodic table?
by Peter Nguyen 2I
Sun Oct 21, 2018 3:31 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Conceptual Question
Replies: 2
Views: 36

Re: Conceptual Question

Quantum numbers specify the size/shell, shape, orientation, and spin state of an electron.
Hope this helps.
by Peter Nguyen 2I
Sun Oct 21, 2018 2:35 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Shielding
Replies: 5
Views: 42

Shielding

Can someone explain shielding and how it relates to multi electron atoms?
by Peter Nguyen 2I
Sun Oct 21, 2018 2:27 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 3
Views: 54

Quantum Numbers

Are quantum numbers always integers? Can they ever be decimals or fractions?
by Peter Nguyen 2I
Sun Oct 14, 2018 1:09 pm
Forum: Properties of Electrons
Topic: Photoelectric Experiment
Replies: 9
Views: 80

Photoelectric Experiment

I understand that a higher frequency, not a higher intensity, will be able to remove an electron. However, what I don't understand is why? Increasing intensity and increasing frequency are both forms of increasing energy.
by Peter Nguyen 2I
Sun Oct 14, 2018 1:00 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Planck's constant
Replies: 7
Views: 76

Planck's constant

Can someone explain to me what Planck's constant means and how it relates to what we are learning?
by Peter Nguyen 2I
Sun Oct 14, 2018 12:50 pm
Forum: Einstein Equation
Topic: Frequency and Velocity
Replies: 1
Views: 34

Frequency and Velocity

Both frequency and velocity are denoted by the letter "v", how can we tell the difference and will they be specified on the tests?
by Peter Nguyen 2I
Fri Oct 05, 2018 5:43 pm
Forum: Balancing Chemical Reactions
Topic: States of Matter
Replies: 11
Views: 141

States of Matter

When balancing a chemical equation do the states of matter, (s),(l),(g), and (aq), affect anything or are they just there to show what state of matter the reactants/products are?
by Peter Nguyen 2I
Fri Oct 05, 2018 4:42 pm
Forum: Molarity, Solutions, Dilutions
Topic: Rounding molar mass
Replies: 4
Views: 74

Rounding molar mass

Is it okay to round the molar mass of the elements while calculating something? If so, to what place do I round the molar mass to?
by Peter Nguyen 2I
Fri Oct 05, 2018 4:35 pm
Forum: Significant Figures
Topic: knowing how many sig figs to use
Replies: 17
Views: 367

knowing how many sig figs to use

I am still a bit confused on significant figures and when to use a certain number of sig figs. Will the answer to a problem always have the same number of sig figs as in the question?

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