Search found 21 matches

by Julie Barreto 3A
Sun Mar 19, 2017 6:27 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Intermediates in pre equilibrium
Replies: 9
Views: 2027

Re: Intermediates in pre equilibrium

usually there is one intermediate
by Julie Barreto 3A
Sun Mar 19, 2017 6:27 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Intermediates in pre equilibrium
Replies: 9
Views: 2027

Re: Intermediates in pre equilibrium

there can be 2 transition states in an electorphillic reaction
by Julie Barreto 3A
Mon Mar 06, 2017 11:18 pm
Forum: Administrative Questions and Class Announcements
Topic: Quiz 3 Winter 2017
Replies: 183
Views: 15867

Re: Quiz 3 Winter 2017

how would you draw out 2-butene or anything with a number in front of it ???
by Julie Barreto 3A
Mon Mar 06, 2017 10:47 pm
Forum: *Cycloalkanes
Topic: Cyclo-
Replies: 7
Views: 882

Re: Cyclo-

how do you know which carbon to number first?
i know it has to do with the lowest substituents
by Julie Barreto 3A
Mon Feb 20, 2017 7:59 pm
Forum: Second Order Reactions
Topic: homework problem #35
Replies: 4
Views: 607

Re: homework problem #35

for question 39 i understand using the second order integrated rate law but what does the question mean when it asks for the rate law expressed in terms of the loss of A??
by Julie Barreto 3A
Sun Feb 05, 2017 8:00 pm
Forum: Balancing Redox Reactions
Topic: Oxidation and Reduction
Replies: 3
Views: 373

Re: Oxidation and Reduction

wait nevermind I got it haha
by Julie Barreto 3A
Sun Feb 05, 2017 7:50 pm
Forum: Balancing Redox Reactions
Topic: Oxidation and Reduction
Replies: 3
Views: 373

Re: Oxidation and Reduction

for that same problem, i understand that you have to balance the hydorgen and electrons but why is it 2H+ when there is only 5 on the reactant side and 4 on the product side?
by Julie Barreto 3A
Mon Jan 30, 2017 10:32 pm
Forum: Calculating Work of Expansion
Topic: Work of Expansion and Compression
Replies: 4
Views: 402

Re: Work of Expansion and Compression

in a bomb calorimeter is it true that
Qsystem =-Qcalorimeter
by Julie Barreto 3A
Mon Jan 30, 2017 5:32 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Spontaneity
Replies: 4
Views: 556

Re: Spontaneity

when do you know if work is being done on the system or by the system?
by Julie Barreto 3A
Thu Jan 19, 2017 8:32 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Reaction Enthalpies HW Q49
Replies: 1
Views: 246

Reaction Enthalpies HW Q49

The question asks for the internal energy for the reaction of 1.00 mol. I understand that you use the internal energy equation. But how do you know if the reaction is in constant pressure or not. How do you know for which questions you can use qp or just q.?
by Julie Barreto 3A
Fri Jan 13, 2017 5:26 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013689

Re: Post All Chemistry Jokes Here

Superman is a man. Batman is a man. Spiderman is a man. So why is Ironman a woman?
A: Because she is a Female.
by Julie Barreto 3A
Tue Nov 29, 2016 9:28 pm
Forum: Identifying Acidic & Basic Salts
Topic: Identifying a salt
Replies: 4
Views: 617

Re: Identifying a salt

so, how would you know if a salt is an acid or base? like: NH4Cl
by Julie Barreto 3A
Tue Nov 29, 2016 9:00 pm
Forum: Identifying Acidic & Basic Salts
Topic: Salt acidic or basic?
Replies: 3
Views: 1360

Re: Salt acidic or basic?

what is your only given the salt and it asks if its an acid or base without the equation : for instance, NH4Br
by Julie Barreto 3A
Tue Nov 29, 2016 8:55 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Homework Help 12.65
Replies: 4
Views: 649

Re: Homework Help 12.65

How can a pH be less than 7 but be basic??and vice versa ...doesn't make sense??
by Julie Barreto 3A
Sat Nov 19, 2016 11:45 am
Forum: Lewis Acids & Bases
Topic: Homework 12.109- hydronium and hydroxide ions
Replies: 2
Views: 401

Re: Homework 12.109- hydronium and hydroxide ions

why is there 3 different ways to find ph? how do you which to use?(they were discussed in lecture on Friday)
by Julie Barreto 3A
Sun Nov 06, 2016 3:47 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order?
Replies: 5
Views: 561

Re: Bond Order?

quick question: How do you know what you can write the sigma antibonding before the sigma pz state in s molecular orbital theory diagram thanks lol
by Julie Barreto 3A
Sun Nov 06, 2016 3:35 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Molecular Orbital Theory
Replies: 4
Views: 444

Re: Molecular Orbital Theory

In molecular orbital theory, bond order is also defined as the difference, divided by two, between the number of bonding and antibonding electrons; this often, but not always, yields the same result. Bond order is also an index of bond strength, and it is used extensively in valence bond theory.
by Julie Barreto 3A
Thu Oct 20, 2016 7:08 pm
Forum: Sigma & Pi Bonds
Topic: sigma and pi [ENDORSED]
Replies: 1
Views: 366

sigma and pi [ENDORSED]

How do you calculate the valence electron configuration using sigma and pi
by Julie Barreto 3A
Fri Oct 14, 2016 4:39 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7581
Views: 1013689

Re: Post All Chemistry Jokes Here

What did one ion say to the other?
I've got my ion you.
by Julie Barreto 3A
Fri Oct 07, 2016 1:16 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbital Nodes
Replies: 1
Views: 254

Re: Orbital Nodes

There are four nodes total (5-1=4) and there are two angular nodes (d orbital has a quantum number ℓ=2) on the xz and zy planes. This means there there must be two radial nodes.
by Julie Barreto 3A
Fri Sep 30, 2016 12:25 pm
Forum: General Science Questions
Topic: Photoelectric effect
Replies: 1
Views: 435

Photoelectric effect

Can someone please explain the photoelectric effect? I understand that when the ultraviolet radiation source hits the metal with enough intensity the electrons jump off. - the shorter the wave=higher frequency - further, increasing intensity= increasing photons The real question is if the threshold ...

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