Search found 30 matches

by Kayla Tchorz-Dis 1F
Sun Mar 18, 2018 3:14 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity of Water
Replies: 4
Views: 220

Re: Heat Capacity of Water

the hydrogen bonds are very difficult to break so therefore it has a high heat capacity because it reuqires a lot of energy to break these bonds
by Kayla Tchorz-Dis 1F
Sun Mar 18, 2018 3:12 pm
Forum: Phase Changes & Related Calculations
Topic: Steam
Replies: 7
Views: 528

Re: Steam

water is at a higher temp when it is steam, so therefore it would cause a more severe burn
by Kayla Tchorz-Dis 1F
Sun Mar 11, 2018 10:39 pm
Forum: Balancing Redox Reactions
Topic: Test #2
Replies: 4
Views: 136

Re: Test #2

K>1 means its spotaneous, essentially its the opposite of delta g.
by Kayla Tchorz-Dis 1F
Sun Mar 11, 2018 10:38 pm
Forum: Balancing Redox Reactions
Topic: Oxidation Number
Replies: 4
Views: 114

Re: Oxidation Number

finding the oxidation of a molecule that isn't standard depends entirely upon the the oxidation number of the molecule with standard oxidation values, like O and H. they usually have to equal each other, so just make sure the charges cancel out. hope that makes sense
by Kayla Tchorz-Dis 1F
Sun Mar 11, 2018 10:36 pm
Forum: Balancing Redox Reactions
Topic: Ranking elements
Replies: 8
Views: 283

Re: Ranking elements

the more negative the number, the higher reducing potential that element has. You would be given the values and just rank them from that.
by Kayla Tchorz-Dis 1F
Sat Mar 03, 2018 11:55 pm
Forum: Second Order Reactions
Topic: Half-life of Second-Order
Replies: 2
Views: 97

Re: Half-life of Second-Order

it is definitely correct and useable, so I'm not really sure why it would say don't use it. Maybe we won't be asked this question often.
by Kayla Tchorz-Dis 1F
Sat Mar 03, 2018 11:53 pm
Forum: First Order Reactions
Topic: Naming Orders
Replies: 3
Views: 121

Re: Naming Orders

I think individually the orders are first, and together they form a second order reaction.
by Kayla Tchorz-Dis 1F
Sat Mar 03, 2018 11:51 pm
Forum: First Order Reactions
Topic: k
Replies: 16
Views: 462

Re: k

The units of k are completely dependent on what order you are dealing with. Zero order is M/s, first order is in s^-1, and second order is L/mol●s
by Kayla Tchorz-Dis 1F
Mon Feb 26, 2018 9:39 am
Forum: General Rate Laws
Topic: Rate of Reaction
Replies: 4
Views: 95

Re: Rate of Reaction

you just need to pay attention to the coefficients, and since o2 is half, theres half as much made
by Kayla Tchorz-Dis 1F
Mon Feb 26, 2018 9:38 am
Forum: General Rate Laws
Topic: Reaction Rates [ENDORSED]
Replies: 2
Views: 75

Re: Reaction Rates [ENDORSED]

I think that since its moving forward creating products, is why its positive.
by Kayla Tchorz-Dis 1F
Mon Feb 26, 2018 9:36 am
Forum: General Rate Laws
Topic: rate constants
Replies: 7
Views: 191

Re: rate constants

I'm also a little confused on the concept of K. In our notes it says K is dependent on temperature and activation energy. So if it's dependent, how is it a constant?
by Kayla Tchorz-Dis 1F
Fri Feb 16, 2018 2:30 pm
Forum: Balancing Redox Reactions
Topic: Salt Bridge Versus Pourous Disk
Replies: 6
Views: 159

Salt Bridge Versus Pourous Disk

I was wondering if using a porous disk or a salt bridge made the reaction different, and what that difference is. Thank you!
by Kayla Tchorz-Dis 1F
Fri Feb 16, 2018 2:27 pm
Forum: Balancing Redox Reactions
Topic: Salt Bridges
Replies: 14
Views: 223

Re: Salt Bridges

Salt bridges are used to transfer electrons that have already passed from the anode, to the cathode, back to the anode. This maintains equilibrium in the battery and allows it to not “die” as fast.
by Kayla Tchorz-Dis 1F
Fri Feb 16, 2018 2:25 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cell diagram acidic/basic
Replies: 3
Views: 76

Re: Cell diagram acidic/basic

Yes because since you are using both those specific methods, you have to add either OH or H+ to signify that.
by Kayla Tchorz-Dis 1F
Mon Feb 12, 2018 2:13 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Delta S total [ENDORSED]
Replies: 2
Views: 147

Re: Delta S total [ENDORSED]

ΔSsys+Δsurroundings =Δtotal, so when ΔS total=0, you just move either ΔS sys or ΔSsurr to the other side, making one negative. It doesn't matter which one
by Kayla Tchorz-Dis 1F
Mon Feb 12, 2018 2:05 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Cp v. Cv!
Replies: 5
Views: 168

Re: Cp v. Cv!

You use Cp when there is constant pressure and Cv when you are delaing with constant volume
by Kayla Tchorz-Dis 1F
Mon Feb 12, 2018 12:52 pm
Forum: Phase Changes & Related Calculations
Topic: Reversible
Replies: 5
Views: 373

Reversible

Can someone please explain to me the difference between what reversible and irreversible and how it’s improtnst to understanding a question! Thanks!
by Kayla Tchorz-Dis 1F
Sun Feb 04, 2018 11:01 pm
Forum: Phase Changes & Related Calculations
Topic: enthalpy and entropy when it comes to spontaneous reactions
Replies: 6
Views: 169

Re: enthalpy and entropy when it comes to spontaneous reactions

the value of temperature plays a great deal into the spontaneity of the reaction. The sign of the delta H and the delta also influences the ultimate sign of delta G, so it is somewhat a case to case basis. Neither one over the other influences it more.
by Kayla Tchorz-Dis 1F
Sun Feb 04, 2018 10:52 pm
Forum: Phase Changes & Related Calculations
Topic: Degeneracy
Replies: 4
Views: 159

Re: Degeneracy

these are all correct, but the way that I find it easiest to remember it is basically the different ways we can arrange particles
by Kayla Tchorz-Dis 1F
Sun Feb 04, 2018 10:47 pm
Forum: Phase Changes & Related Calculations
Topic: The universe
Replies: 9
Views: 243

Re: The universe

The universe is isolated because we consider it to be everything in existence, therefore it cannot lose energy or matter to anything else.
by Kayla Tchorz-Dis 1F
Sun Jan 28, 2018 10:22 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 7
Views: 209

Re: Bond Enthalpies

The stronger the bonds, the more energy it takes to require to break the bonds, therefore having a higher bond enthalpy.
by Kayla Tchorz-Dis 1F
Sun Jan 28, 2018 10:19 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question regarding 8.39 homework question
Replies: 5
Views: 172

Re: Question regarding 8.39 homework question

The way I like to think of it is that you want to use the specific heat of the phase that it is changing into, as long as you're temperature threshold does not cross between two phases. This would do this if the problem would have started with -1 degree celsius. Hope that helps!
by Kayla Tchorz-Dis 1F
Sun Jan 28, 2018 10:16 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Question 8.31
Replies: 7
Views: 253

Re: Question 8.31

Since you add 273 to both values, it would not interfere with the delta T value.
by Kayla Tchorz-Dis 1F
Sun Jan 21, 2018 5:13 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.67
Replies: 3
Views: 126

Re: 8.67

For this, I'm also confused how you are supposed to combine the use of bond enthapies and also the enthalpy of formations.
by Kayla Tchorz-Dis 1F
Sun Jan 21, 2018 5:08 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: delta U and delta h
Replies: 1
Views: 83

delta U and delta h

I'm confused how delta U is related to delta H, also if this will be on the upcoming test. Thanks!
by Kayla Tchorz-Dis 1F
Sun Jan 21, 2018 5:05 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Heat versus work
Replies: 6
Views: 166

Heat versus work

I'm confused on what I need to know, relevently, about the difference between work and heat. I know that heat is the energy associated with the random motion of particles, and work is energy of ordered motion in one direction, but I'm still confused as to what that really means. Thanks in advance!
by Kayla Tchorz-Dis 1F
Sun Jan 14, 2018 12:08 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Calorimeter
Replies: 10
Views: 357

Calorimeter

Can someone explain to me the importance and function of a calorimeter? Is this something that will be a big topic in our upcoming problems?
by Kayla Tchorz-Dis 1F
Sun Jan 14, 2018 12:06 pm
Forum: Phase Changes & Related Calculations
Topic: Why can state properties be added?
Replies: 11
Views: 363

Re: Why can state properties be added?

As stated before, state properties do not depend on the path taken, and therefore because they’re independent of this, we can add them together.
by Kayla Tchorz-Dis 1F
Sat Jan 13, 2018 8:30 pm
Forum: Calculating Work of Expansion
Topic: Work (in general) [ENDORSED]
Replies: 4
Views: 151

Work (in general) [ENDORSED]

How do you know which work equation to use?

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