Search found 32 matches

by cristiancampana 2H
Sat Mar 17, 2018 8:40 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: when exactly do you use the Arrhenius equation?
Replies: 3
Views: 274

when exactly do you use the Arrhenius equation?

what would make one recognize that the equation is needed?
by cristiancampana 2H
Sat Mar 17, 2018 8:39 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: how much of catalyst do we need to know? [ENDORSED]
Replies: 4
Views: 299

how much of catalyst do we need to know? [ENDORSED]

It was briefly went over in class once and thats it
by cristiancampana 2H
Sat Mar 17, 2018 8:06 pm
Forum: General Rate Laws
Topic: how to find the rate constant given instantaneous
Replies: 2
Views: 302

how to find the rate constant given instantaneous

which equation would one use to find it out?
by cristiancampana 2H
Sat Mar 17, 2018 8:04 pm
Forum: General Rate Laws
Topic: number of mols effect on result
Replies: 2
Views: 249

number of mols effect on result

how does the number of moles affect the rate of reaction
by cristiancampana 2H
Sat Mar 17, 2018 7:57 pm
Forum: Balancing Redox Reactions
Topic: flipping the sign of anodes
Replies: 5
Views: 444

flipping the sign of anodes

when do you flip the sign of anodes if the are giving in cathodes. I've done some questions and some do and some dont flip the sign and i am unsure why.
by cristiancampana 2H
Sat Mar 17, 2018 7:46 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: changing intermediate K to regular terms
Replies: 1
Views: 211

changing intermediate K to regular terms

how do you change intermediate K to one in terms of reactants or products
by cristiancampana 2H
Mon Feb 19, 2018 8:50 pm
Forum: Balancing Redox Reactions
Topic: example 14.1 in the book
Replies: 1
Views: 65

example 14.1 in the book

the example says that the oxidation number of carbon in C2H2O4 is +3 and that it is +4 in CO2. can someone explain why the oxidation numbers are so?
by cristiancampana 2H
Wed Jan 31, 2018 11:43 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: phase change change in entropy
Replies: 2
Views: 88

phase change change in entropy

how does one calculate the change in entropy in a phase change. I know that Delta S= q(rev)/T= Delta H(fusion)/T , but why suddenly change q to Delta H
by cristiancampana 2H
Wed Jan 31, 2018 11:38 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: what exactly is free energy?
Replies: 5
Views: 217

what exactly is free energy?

I'm not sure what free energy is, can someone explain it please ( as in Gibbs free energy)
by cristiancampana 2H
Wed Jan 31, 2018 11:26 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: entropy and heat capacity
Replies: 2
Views: 108

entropy and heat capacity

can heat capacity and entropy ever have the same value since their formulas are so similar?
by cristiancampana 2H
Wed Jan 31, 2018 11:21 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: q(rev)
Replies: 1
Views: 105

q(rev)

why does delta S use q of a reversible process and not of an irreversible process.
by cristiancampana 2H
Wed Jan 31, 2018 11:18 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: 9.13
Replies: 5
Views: 219

9.13

why must you assume that there is 1 mole of N?
by cristiancampana 2H
Wed Jan 24, 2018 11:01 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 8.31
Replies: 5
Views: 232

Re: 8.31

in page 281, it says that Cv,m= 3/2R . so you multiply both sides by m to make Cv,m just Cv. Then Cv= ΔU/ΔT. multiply both sides by ΔT and you get ΔU= 3/2R n ΔT. and ΔU is just q because w is 0 since there is no change in volume.
by cristiancampana 2H
Wed Jan 17, 2018 11:57 pm
Forum: Calculating Work of Expansion
Topic: determining value of volume based on enery [ENDORSED]
Replies: 1
Views: 115

determining value of volume based on enery [ENDORSED]

in question 8.6, they ask you to determine if the volume of the resulting energy would be more or less to the initial energy. how does one solve for that?
by cristiancampana 2H
Wed Jan 17, 2018 11:53 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: increasing energy in a system [ENDORSED]
Replies: 1
Views: 113

increasing energy in a system [ENDORSED]

does adding substance in an open system increase energy, why or why not?
by cristiancampana 2H
Wed Jan 17, 2018 11:45 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: the sign of q and w [ENDORSED]
Replies: 6
Views: 232

the sign of q and w [ENDORSED]

why is it that sometimes q and w are negative, but in the equation ΔU= q+w they are both positive such in 8.11
by cristiancampana 2H
Sun Dec 10, 2017 1:01 am
Forum: Hybridization
Topic: what is the composition of a triple bond?
Replies: 1
Views: 137

what is the composition of a triple bond?

for example on the practice final that was posted here, question 17 has a CN that are bonded by triple bonds. I know that a pi bond is caused by two p orbits overlapping. since there are two pi bonds, i do not know how to write the composition.
by cristiancampana 2H
Sun Dec 10, 2017 12:52 am
Forum: Trends in The Periodic Table
Topic: Electron shielding
Replies: 2
Views: 212

Electron shielding

It's been a while and have forgotten how to test for electron shielding and its purpose. Can anyone help? I don't seem to grab the concept from just reading the book.
by cristiancampana 2H
Sun Dec 10, 2017 12:41 am
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: OxoAcid strength
Replies: 2
Views: 311

OxoAcid strength

I know that an oxoacid is stronger the more O's it has, but do not know why. Thanks in advance.
by cristiancampana 2H
Sun Dec 10, 2017 12:29 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: dotted line that is not resonance
Replies: 1
Views: 139

dotted line that is not resonance

there is sometimes a line that connects the TM to a different atom that is dotted but is not resonance. I know this because as i was working through a problem, there was the line connecting the transitionmetal to a N who had resonance with another element, and the FC that i calculated was one. Howev...
by cristiancampana 2H
Sun Dec 10, 2017 12:25 am
Forum: Lewis Acids & Bases
Topic: the importance of protonation
Replies: 2
Views: 175

the importance of protonation

I was going over some practice final problems and did not know what protonation was and was wonder its significance and if itll be on the test.
by cristiancampana 2H
Sun Dec 10, 2017 12:23 am
Forum: Ionic & Covalent Bonds
Topic: Ca- vs Ca+
Replies: 2
Views: 200

Ca- vs Ca+

which one will have stronger bonds and why?
by cristiancampana 2H
Sun Dec 10, 2017 12:20 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: carboxylic strength
Replies: 2
Views: 282

carboxylic strength

How does one determine the strength of a carboxylic acid?
by cristiancampana 2H
Sun Dec 10, 2017 12:19 am
Forum: Bronsted Acids & Bases
Topic: strength of acid
Replies: 1
Views: 140

strength of acid

I remember learning that binary acids are stronger when the electronegativity is larger, but wouldnt it make it harder for the acid to let go of the H if its stronger?
by cristiancampana 2H
Sun Dec 10, 2017 12:14 am
Forum: Naming
Topic: (en) (dien)
Replies: 1
Views: 284

(en) (dien)

will we have to know the full formula for (en) and (dien) on the final?
by cristiancampana 2H
Sun Dec 10, 2017 12:05 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: compression vs pressure
Replies: 6
Views: 283

compression vs pressure

what is the relationship between pressure and compression? i believed that changing the pressure did not affect the overall Kc but i have a problem where it says that compression doubles the molarity.
by cristiancampana 2H
Sun Oct 15, 2017 3:46 pm
Forum: DeBroglie Equation
Topic: De Broglies relation
Replies: 1
Views: 140

De Broglies relation

I was wondering if there is no wavelength if an object is stationary or still. The momentum will be 0, but anything over 0 is undefined, so I was a bit confused.
by cristiancampana 2H
Sun Oct 15, 2017 2:51 pm
Forum: Properties of Electrons
Topic: Atomic Spectra [ENDORSED]
Replies: 3
Views: 285

Atomic Spectra [ENDORSED]

I got this one wrong in the post-assessment and was not able to solve for the second answer, only the first: . The meter was defined in 1963 as 1,650,763.73 wavelengths of radiation emitted by krypton-86 (it has since been redefined). What is the wavelength of this krypton-86 radiation? To what regi...
by cristiancampana 2H
Sun Oct 08, 2017 3:41 pm
Forum: Molarity, Solutions, Dilutions
Topic: Help with G.15 in the homework
Replies: 1
Views: 170

Help with G.15 in the homework

I know how to get the first answer of .05but can not get the second answer and can not seem to figure out what is wrong

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