Search found 16 matches

by Jason Ching
Sun Mar 13, 2016 10:23 pm
Forum: *Alkenes
Topic: Priority
Replies: 1
Views: 456

Re: Priority

You don't need to name it cis or trans since one side have both atoms that are the same.
by Jason Ching
Sun Mar 13, 2016 10:07 pm
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: chair conformation
Replies: 3
Views: 464

Re: chair conformation

No they are all the same no matter where you place them.
by Jason Ching
Sun Mar 13, 2016 10:05 pm
Forum: *Constitutional and Geometric Isomers (cis, Z and trans, E)
Topic: E/Z Stability
Replies: 2
Views: 501

Re: E/Z Stability

E because there is less tension between the molecules.
by Jason Ching
Mon Feb 29, 2016 12:25 am
Forum: *Alkenes
Topic: Naming alkenes
Replies: 1
Views: 270

Re: Naming alkenes

The number is usually in front indicating which carbon it is bonded to.
by Jason Ching
Mon Feb 29, 2016 12:22 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1119449

Re: Chemistry Jokes

A neutron walks into a restaurant and orders a couple of cokes. As she is about to leave, she asks the waiter how much she owes. The waiter replies, "For you, No Charge!!!"
by Jason Ching
Mon Feb 29, 2016 12:21 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1119449

Re: Chemistry Jokes

Don't trust atoms, they make up everything.
by Jason Ching
Sun Feb 21, 2016 11:05 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Psuedo-Thermodynamic Parameters
Replies: 1
Views: 271

Re: Psuedo-Thermodynamic Parameters

In the psuedo-thermodynamic parameters standard enthalpy is always positives when bonds are broken and negative when bonds are being formed.
by Jason Ching
Sun Feb 21, 2016 10:59 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Homogeneous and Heterogeneous Catalysts
Replies: 3
Views: 620

Re: Homogeneous and Heterogeneous Catalysts

Heterogeneous reactants are reactants that are catalysts that are in different phases. A heterogeneous catalyst will appear in the reaction mechanism (as different phases), but it will not appear in the final overall chemical reaction.
by Jason Ching
Sun Feb 21, 2016 10:48 pm
Forum: *Electrophiles
Topic: Identifying an Electrophile/Nucleophile
Replies: 3
Views: 424

Re: Identifying an Electrophile/Nucleophile

Nucleophiles are electron rich regions that have "excess electrons" which can be bonding regions or an atom with lone pairs. Bonds can be nulceophiles because there is an "excess of electron" there. I don't think bonds can be electrophiles since bonds involves electrons.
by Jason Ching
Sun Feb 21, 2016 10:44 pm
Forum: *Organic Reaction Mechanisms in General
Topic: PseudoThermodynamics
Replies: 2
Views: 398

Re: PseudoThermodynamics

In Pseudo-Thermodynamics standard ethalpy (delta H) is always positive I believe.
by Jason Ching
Sun Feb 14, 2016 10:40 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1119449

Re: Chemistry Jokes

Appropriate for Valentine's Day.

Do you have 11 protons? Cause your sodium fine
by Jason Ching
Sun Feb 14, 2016 10:37 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1119449

Re: Chemistry Jokes

Enjoy!
by Jason Ching
Sat Jan 23, 2016 11:48 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Problem 8.31
Replies: 1
Views: 313

Re: Problem 8.31

Example 8.6 should be able to answer your question. For constant volume you use the heat capacity of volume formula Cv,m which is (5/2)R and for constant pressure you use the heat capacity of pressure formula Cp,m which is (5/2)R+R.
by Jason Ching
Sun Nov 01, 2015 10:32 pm
Forum: Lewis Structures
Topic: Lowest Formal Charge
Replies: 2
Views: 1309

Re: Lowest Formal Charge

The one with just one atom with a -3 charge. You want as many atoms with 0 charge as possible.
by Jason Ching
Sun Oct 25, 2015 9:31 pm
Forum: Lewis Structures
Topic: Formal Charge
Replies: 3
Views: 355

Re: Formal Charge

Formal Charge of an atom tells you the gain or loss of electron(s) while forming a covalent bond. The formula for determining formal charge (F.C.) = V - (L+S/2). V represents the # of valence electrons of the element. L is the # of lone pairs of the element. and S is the # shared bonding pairs of el...
by Jason Ching
Sun Oct 18, 2015 11:22 pm
Forum: Ionic & Covalent Bonds
Topic: Structures of Polyatomic Species
Replies: 1
Views: 379

Re: Structures of Polyatomic Species

For SO4 there are four oxygens each having a minus 1 charge and the sulfur itself having a plus 2 charge. Thus SO4 having a total net charge of -2. You can find out the charge for each of the elements by using the formal charge(FC) formula = V -(L+S/2). V being the valence electron, L being the lone...

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