Search found 19 matches

by Sarah Clemens 1B
Sun Mar 11, 2018 8:43 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Homework 15.67
Replies: 1
Views: 112

Homework 15.67

Can someone explain how to start this problem? Thank you!!
by Sarah Clemens 1B
Sun Mar 11, 2018 8:41 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: What is Molecularity?
Replies: 9
Views: 623

Re: What is Molecularity?

Elementary rxns are classified according to their molecularity, the number of reactant molecules, atoms, or ions taking part in that particular rxn
by Sarah Clemens 1B
Sun Mar 11, 2018 8:39 pm
Forum: First Order Reactions
Topic: Pseudo First Order Reaction
Replies: 7
Views: 619

Pseudo First Order Reaction

Can someone explain when we would need to use a pseudo first order reaction?
by Sarah Clemens 1B
Sun Mar 04, 2018 6:03 pm
Forum: General Rate Laws
Topic: homework 15.19 part c
Replies: 1
Views: 87

homework 15.19 part c

Can someone explain how to get the right answer for part c please!!
by Sarah Clemens 1B
Sun Mar 04, 2018 5:58 pm
Forum: General Rate Laws
Topic: Half-Life
Replies: 2
Views: 109

Re: Half-Life

You might be asked to calculate how much of a substance will be left after a specific amount of time has passed, in which case you could use the half life equation to answer
by Sarah Clemens 1B
Sun Mar 04, 2018 5:56 pm
Forum: Zero Order Reactions
Topic: Will we need to know how to derive equations? [ENDORSED]
Replies: 9
Views: 337

Re: Will we need to know how to derive equations? [ENDORSED]

Since there are equations that are easier to use to solve for some problems that come from derivations from the equations that are given, you technically need to know how to derive them, but I dont think we would be tested on actually deriving them
by Sarah Clemens 1B
Sun Feb 18, 2018 3:27 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell diagram
Replies: 2
Views: 108

Cell diagram

When do you add an inert metallic component to the cell diagram? If you add one to one electrode, do you have to add it to the other?
by Sarah Clemens 1B
Sun Feb 18, 2018 2:49 pm
Forum: Balancing Redox Reactions
Topic: Balancing redox rxns [ENDORSED]
Replies: 7
Views: 234

Re: Balancing redox rxns [ENDORSED]

Toolbox 14.1 in the textbook on page 563 gives step by step for balancing redox equations if thats any help!
by Sarah Clemens 1B
Sun Feb 18, 2018 2:08 pm
Forum: Balancing Redox Reactions
Topic: 14.3 part d
Replies: 1
Views: 97

14.3 part d

Can anyone explain how to balance the half reactions for part d?
by Sarah Clemens 1B
Mon Feb 05, 2018 12:48 am
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: 9.27 A
Replies: 5
Views: 197

Re: 9.27 A

Since Br is a bigger molecule than F it makes it more complex which means it also has a larger entropy.
by Sarah Clemens 1B
Mon Feb 05, 2018 12:44 am
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: negative entropy [ENDORSED]
Replies: 10
Views: 307

Re: negative entropy [ENDORSED]

A negative entropy just means that the system is becoming more ordered, it doesn't mean that there isn't any entropy.
by Sarah Clemens 1B
Mon Feb 05, 2018 12:36 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Homework 9.69
Replies: 1
Views: 71

Homework 9.69

Is this the type of question you would use the Hess's Law approach? If not can someone explain how to solve this please!
by Sarah Clemens 1B
Sun Jan 28, 2018 8:11 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Difference between systems? [ENDORSED]
Replies: 8
Views: 307

Re: Difference between systems? [ENDORSED]

Closed has a fixed amount fo energy but it can exchange energy with its surroundings (cold pack)
Open can exchange both matter and energy with the surroundings (human body)
Isolated has no contact with its surroundings (thermos)
by Sarah Clemens 1B
Sun Jan 28, 2018 8:02 pm
Forum: Phase Changes & Related Calculations
Topic: Superheating
Replies: 6
Views: 374

Re: Superheating

Nice question. Superheating is when something goes over its boiling point without actually boiling!
by Sarah Clemens 1B
Sun Jan 28, 2018 8:01 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 7
Views: 257

Re: Bond Enthalpies

Hi Abby!!! Your question is really good. The reason it is more stable is because the bonds are harder to break!
by Sarah Clemens 1B
Sun Jan 21, 2018 9:28 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HW 8.57
Replies: 1
Views: 98

HW 8.57

Can someone explain how you would approach this question?
by Sarah Clemens 1B
Sun Jan 21, 2018 9:15 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 Test Topic is endorsed
Replies: 37
Views: 1805

Re: Week 3 Test Topic is endorsed

Can anyone give me an example of a conceptual question that has to do with work or energy?
by Sarah Clemens 1B
Mon Jan 15, 2018 10:07 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Determining sign of q
Replies: 2
Views: 98

Determining sign of q

How do you know what sign q has?
by Sarah Clemens 1B
Wed Oct 25, 2017 9:08 pm
Forum: Quantum Numbers and The H-Atom
Topic: Subshell Qualities
Replies: 2
Views: 151

Re: Subshell Qualities

That is false because the electrons in an atom directly correspond to its charge. For example, if a Z atom loses one electron, it becomes Z⁻¹

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