Search found 11 matches

by Selina_Han_3I
Thu Mar 16, 2017 12:28 am
Forum: *Cyclohexanes (Chair, Boat, Geometric Isomers)
Topic: Winter 2013 Final 8B
Replies: 3
Views: 600

Re: Winter 2013 Final 8B

What you recalled in lecture is correct; however, in lecture, we discussed cis isomers with substituents attached to carbons 1 and 4. In cis-1-chloro-3-ethylcyclohexane, the substituents are connected to carbons 1 and 3. Cis means that both substituents will be on the same side, and therefore pointi...
by Selina_Han_3I
Mon Mar 13, 2017 1:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7560
Views: 1010701

Re: Post All Chemistry Jokes Here

What is the chemical formula for laughing gas?
HeHeHe
by Selina_Han_3I
Sat Mar 11, 2017 12:50 am
Forum: *Ethers
Topic: Ether vs Ketone [ENDORSED]
Replies: 1
Views: 722

Re: Ether vs Ketone [ENDORSED]

CH3CH2CH2OCH2CH2CH2CH3 is an ether. Try to focus on the carbons surrounding the oxygen. "...CH2OCH2..." Both of these carbons are attached to two hydrogens, another neighboring carbon, and an oxygen. This means thats the bonds around the carbon must be single bonds, and therefore between t...
by Selina_Han_3I
Mon Feb 27, 2017 7:35 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7560
Views: 1010701

Re: Post All Chemistry Jokes Here

A neutron walks into a bar and asks "how much for a beer?" The bartender says, "for you? no charge."
by Selina_Han_3I
Wed Feb 22, 2017 11:40 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7560
Views: 1010701

Re: Post All Chemistry Jokes Here

Oxygen went on a date with Potassium. It was OK. But I thought Oxygen was with Magnesium! OMG! At first Oxygen asked out Nitrogen, but Nitrogen was all like "NO!" so Oxygen had that double bond with the Hydrogen twins...If I didn't know any better, I'd say someone was a HO, but Sodium Hypo...
by Selina_Han_3I
Tue Feb 14, 2017 2:10 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7560
Views: 1010701

Re: Post All Chemistry Jokes Here

Chemistry. More like cheMYSTERY because sometimes I have no idea what's going on.
by Selina_Han_3I
Mon Feb 06, 2017 1:28 pm
Forum: Balancing Redox Reactions
Topic: Ch. 14 #5
Replies: 1
Views: 228

Re: Ch. 14 #5

From O3 --> O2, you want to first balance the reactions by adding H2O and OH- since the reactions are occuring in basic solutions. From there, you will get H2O+O3-->O2+2OH-. On the left side, the oxygens have a total charge of 2- (the net charge of H20 is 0, 2+ from hydrogen and 2- from oxygen; in O...
by Selina_Han_3I
Mon Feb 06, 2017 1:05 pm
Forum: Balancing Redox Reactions
Topic: 14.11 (d)
Replies: 1
Views: 239

Re: 14.11 (d)

Cell potentials can be negative, which indicate that the reactions are not spontaneous.
by Selina_Han_3I
Fri Jan 27, 2017 10:51 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Reversible vs. Irreversible
Replies: 1
Views: 182

Re: Reversible vs. Irreversible

Irreversible reactions are less efficient than reversible reactions, but they occur much faster than reversible reactions.
by Selina_Han_3I
Sun Jan 22, 2017 12:14 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy
Replies: 2
Views: 241

Re: Entropy

Residual entropy is the entropy (disorder) of a system without taking into account any thermal energy. At 0 degrees Kelvin, the molecules of a system will not vibrate, rotate, or move, so the entropy of a system at 0K would only take into account the positions the molecules of that system. For examp...
by Selina_Han_3I
Sat Jan 14, 2017 6:29 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 5
Views: 533

Re: Hess's Law

As previously stated, the main formula is enthalpy of products – enthalpy of reactants. The goal is to have the given multiple reactions add up to equal the main reaction. To manipulate these reactions, you may sometimes need to either flip the reaction, or multiply it by a coefficient. For example,...

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