Search found 60 matches

by Nikki Bych 1I
Sat Mar 16, 2019 9:14 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature and Le Chatlier's Principle
Replies: 6
Views: 110

Temperature and Le Chatlier's Principle

I forget how Temperature affects the reaction, can someone explain it please?
by Nikki Bych 1I
Sat Mar 16, 2019 9:12 am
Forum: General Rate Laws
Topic: Rate Law
Replies: 1
Views: 42

Re: Rate Law

For every reaction, there should be a rate of formation and a rate of consumption.
by Nikki Bych 1I
Sat Mar 16, 2019 9:09 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

I wish I had more chemistry jokes, but I can only think of them periodically.
by Nikki Bych 1I
Sat Mar 16, 2019 9:08 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

What would you call a clown in jail?
Silicon
by Nikki Bych 1I
Sat Mar 16, 2019 9:05 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Collisions/Temperature dependence
Replies: 2
Views: 46

Re: Collisions/Temperature dependence

I think it's talking about how if there are more collisions, that means the temperature is rising.
by Nikki Bych 1I
Sat Mar 16, 2019 9:02 am
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Activation Energy
Replies: 2
Views: 40

Re: Activation Energy

You can tell if you are given both of the activation energies. If the forward rxn Ae is greater than the reverse rxn Ae, then it is endothermic, because the reverse reaction takes less energy to occur. If the reverse rxn Ae is greater than the forward rxn Ae, then it is exothermic, because the forwa...
by Nikki Bych 1I
Sat Mar 16, 2019 8:58 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

What happened to the man with sodium chloride and a 9-V in his car?
He was booked for a-salt and battery.
by Nikki Bych 1I
Sat Mar 16, 2019 8:56 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

What is the most important rule in chemistry?
Never lick the spoon!
by Nikki Bych 1I
Sat Mar 16, 2019 8:56 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

What did the chemist say when he found 2 isotopes of helium?
HeHe
by Nikki Bych 1I
Sat Mar 16, 2019 8:54 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

What did one charged atom say to anther?
I've got my ion you.
by Nikki Bych 1I
Sat Mar 16, 2019 8:54 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

What do you call one tooth in a glass of water?
A one molar solution.
by Nikki Bych 1I
Sat Mar 16, 2019 8:51 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

Why does the army use acid?
To neutralize their enemy base.
by Nikki Bych 1I
Sat Mar 16, 2019 8:50 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

I studied exothermic reactions before they were cool.
by Nikki Bych 1I
Sat Mar 16, 2019 8:49 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

Don't trust atoms, they make up everything.
by Nikki Bych 1I
Sat Mar 16, 2019 8:48 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

Every dipole has their moment.
by Nikki Bych 1I
Sat Mar 16, 2019 8:47 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

What do you do with a sick chemist?
If you can't helium and you can't curium, you might as well barium.
by Nikki Bych 1I
Sat Mar 16, 2019 8:46 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

I wanted to write a joke about the periodic table, but I didn't feel like I was in my element.
by Nikki Bych 1I
Sat Mar 16, 2019 8:46 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

Did you know you can lower your body temperature to -273 Degrees Celsius and still be 0K?
by Nikki Bych 1I
Sat Mar 16, 2019 8:42 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

What kind of dogs do chemists have?
Laboratory retrievers!
by Nikki Bych 1I
Sat Mar 16, 2019 8:38 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst
Replies: 14
Views: 145

Re: Nernst

Yes, if you have a balanced reduction half rxn and balanced oxidation half rxn, they will both tell you the number of e- transferred.
by Nikki Bych 1I
Sat Mar 16, 2019 8:36 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q VS. K
Replies: 13
Views: 215

Re: Q VS. K

Yes! Q is just when the reaction is not at equilibrium, but is calculated the same way.
by Nikki Bych 1I
Thu Mar 14, 2019 12:47 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

Why did the bear dissolve in water?
Because it was a POLAR bear!!!
by Nikki Bych 1I
Thu Mar 14, 2019 12:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 889370

Re: Post All Chemistry Jokes Here

Why do chemistry do well when working with ammonia?
Because it's pretty basic stuff.
by Nikki Bych 1I
Tue Feb 26, 2019 8:45 pm
Forum: Balancing Redox Reactions
Topic: Problem 6k3 part d seventh edition
Replies: 1
Views: 33

Problem 6k3 part d seventh edition

I don't understand how to form a reduction and oxidation reaction from the equation Cl2-->HClO + Cl2
Thank you in advance!!
by Nikki Bych 1I
Wed Feb 13, 2019 11:27 am
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Useful Summary of Thermodynamic Definitions
Replies: 23
Views: 13437

Re: Useful Summary of Thermodynamic Definitions

I am having trouble distinguishing the difference between a state function and an intensive property, they seem very similar to me.
by Nikki Bych 1I
Fri Jan 18, 2019 7:49 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Negative pH
Replies: 12
Views: 266

Re: Negative pH

Unless the question pertains to identifying what substance it is, we probably won't be asked to identify a superacid/base.
by Nikki Bych 1I
Fri Jan 18, 2019 6:27 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Example in class
Replies: 5
Views: 80

Re: Example in class

I'm not in lecture 2 so I may not be correct, but if he used Q then it was probably because the rxn was not at equilibrium.
by Nikki Bych 1I
Fri Jan 18, 2019 6:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Question 6D.13 7th edition
Replies: 1
Views: 41

Re: Question 6D.13 7th edition

So first of all, ranking increasing pH means the most H+ ions first, because on the pH scale the more acidic (the more H+ ions) the lower the number. Second, you can do this by finding out the acidity of the solution. For strong acids you can assume complete dissociation, meaning H+ concentration wi...
by Nikki Bych 1I
Fri Jan 18, 2019 6:19 pm
Forum: Ideal Gases
Topic: Percentage protonated
Replies: 2
Views: 75

Re: Percentage protonated

Further, Lavelle mentioned for weak acid/base it should be below 5% protonated as a way to check if you did the problem right.
by Nikki Bych 1I
Fri Dec 07, 2018 12:35 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pKa versus pKb versus Ka versus Kb [ENDORSED]
Replies: 2
Views: 82

Re: pKa versus pKb versus Ka versus Kb [ENDORSED]

Ka-- acidity
Kb--bacisity
In an such as equation AH + H2O => H3O+ + A-, Ka=products/reactants, and measures the extent to which an acid dissociates in solution (same for Kb but with a basic equation).
p means -log( ).
by Nikki Bych 1I
Fri Dec 07, 2018 12:29 am
Forum: Polyprotic Acids & Bases
Topic: Identifying polyprotic acids and bases
Replies: 2
Views: 139

Re: Identifying polyprotic acids and bases

In the compounds listed above, a commonality is multiple H atoms in compounds such as H2CO3
by Nikki Bych 1I
Fri Dec 07, 2018 12:26 am
Forum: Lewis Acids & Bases
Topic: Lewis and Bronsted
Replies: 8
Views: 134

Re: Lewis and Bronsted

Lewis has to do with electrons and bronzed has to do with protons.
by Nikki Bych 1I
Fri Dec 07, 2018 12:23 am
Forum: Amphoteric Compounds
Topic: H2O as Amphotertic Compound
Replies: 1
Views: 37

H2O as Amphotertic Compound

Is H2O the only amphoteric compound we'll be using? Can anyone find another example of an amphoteric compound
by Nikki Bych 1I
Fri Dec 07, 2018 12:21 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How to tell if something is a chelate
Replies: 6
Views: 118

Re: How to tell if something is a chelate

I believe if the ligand forms a ring with the TM, it is a chelate
by Nikki Bych 1I
Thu Dec 06, 2018 11:47 pm
Forum: Biological Examples
Topic: Ligands
Replies: 6
Views: 182

Re: Ligands

Regarding ligands, the transition metal/cation will almost always be the central atom.
by Nikki Bych 1I
Thu Dec 06, 2018 11:43 pm
Forum: Naming
Topic: Final Exam
Replies: 9
Views: 167

Re: Final Exam

It is probably a good idea to memorize it, on Lyndon's churro practice questions there are questions with en and ox.
by Nikki Bych 1I
Thu Nov 29, 2018 11:25 am
Forum: Hybridization
Topic: Difference between hybridization and hybrid orbitals
Replies: 4
Views: 120

Re: Difference between hybridization and hybrid orbitals

I believe they are the same thing as well.
by Nikki Bych 1I
Thu Nov 29, 2018 11:23 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs Non-Polar
Replies: 2
Views: 62

Re: Polar vs Non-Polar

Looking at the overall dipole is a good way to determine polarity.
by Nikki Bych 1I
Thu Nov 29, 2018 11:21 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Angular Shape
Replies: 3
Views: 71

Re: Angular Shape

Less than 120 degrees, lone pairs alter the bond angle slightly.
by Nikki Bych 1I
Thu Nov 29, 2018 11:08 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 7th edition 2E.1 mistake ?
Replies: 6
Views: 126

Re: 7th edition 2E.1 mistake ?

I don't believe it's a mistake--if you have a electron geometry of trigonal bipyramidal, but 3 lone pairs, the molecular geometry will be linear.
by Nikki Bych 1I
Thu Nov 29, 2018 11:00 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.29 (7th edition)
Replies: 2
Views: 56

Re: 2E.29 (7th edition)

1 has the largest dipole. The dipoles cancel in 3, and since the Cl's are further apart in 2, 1 has the largest dipole. Hope this helped!
by Nikki Bych 1I
Thu Nov 29, 2018 10:46 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E17th edition
Replies: 1
Views: 50

Re: 2E17th edition

Since the the shape is bent, there must be a lone pair, although you are right, it should be less than 120 degrees.
by Nikki Bych 1I
Thu Nov 29, 2018 10:43 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs Nonpolar for CH2Cl2
Replies: 2
Views: 65

Re: Polar vs Nonpolar for CH2Cl2

Since the structure is tetrahedral, the overall dipoles do not cancel.
by Nikki Bych 1I
Fri Nov 16, 2018 1:58 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Polar v. Non Polar
Replies: 7
Views: 178

Re: Polar v. Non Polar

Another way to think of it is molecules like BF3 and CH4 are non polar because they are all being pulled equally in each directly (dipoles cancel) but in molecules such as H20, there is an overall dipole so it is polar.
by Nikki Bych 1I
Fri Nov 16, 2018 1:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs in Molecular Shape
Replies: 4
Views: 77

Re: Lone Pairs in Molecular Shape

Lone pairs are areas of electron density, so they do take up space (like an atom does), but they depress the bond angles more than a normal atom; I think of it as lone pairs needing elbow room!
by Nikki Bych 1I
Fri Nov 16, 2018 1:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Distance from Central Atom
Replies: 8
Views: 89

Re: Distance from Central Atom

I always think of it as shaded represents an atom coming out of the page and dashed represents an atom going backwards, into the page.
by Nikki Bych 1I
Fri Nov 16, 2018 1:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: dash and wedge diagram
Replies: 3
Views: 48

Re: dash and wedge diagram

Lavelle mentioned in lecture that we don't need to draw them using the dash wedge diagram, just the lewis structures. You just have to be able to recognize the shape based off of how many lone pairs/bonding pairs.
by Nikki Bych 1I
Fri Nov 16, 2018 1:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 4
Views: 77

Re: Bond Angles

I believe that we just have to recognize that when there are lone pairs, the bond angles are depressed. i.e. 3 bonding pairs 1 lone pair, as long as you say bond angles are less than 109.5 degrees because of the lone pier you should be fine.
by Nikki Bych 1I
Thu Oct 25, 2018 9:29 pm
Forum: Quantum Numbers and The H-Atom
Topic: Nodal Planes and test 2
Replies: 3
Views: 94

Nodal Planes and test 2

Is it necessary to know how many nodal planes for each orbital for test 2?
by Nikki Bych 1I
Thu Oct 25, 2018 9:19 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic Atoms
Replies: 4
Views: 102

Re: Isoelectronic Atoms

They are not the same size because there is a different attraction to the nucleus. For example, a cation (one less electron) is smaller because there are less electrons for the positive nucleus to pull on, pulling in the electrons tighter and making the atomic radius smaller.
by Nikki Bych 1I
Thu Oct 25, 2018 9:15 pm
Forum: Properties of Light
Topic: Degenerate orbitals
Replies: 2
Views: 103

Degenerate orbitals

In the book the only degenerate orbitals are one-electron atoms only, but the internet explains it as something different. Is the book's description accurate??
by Nikki Bych 1I
Thu Oct 18, 2018 10:37 am
Forum: Properties of Light
Topic: Problem 1.3, Seventh edition
Replies: 1
Views: 55

Problem 1.3, Seventh edition

So in 1.3, ultimately you are supposed to convert your Joules into Js^-1=watts. I have the joules produced (753.669), but from here do I multiply by hertz to get Js^-1? Thank you!
by Nikki Bych 1I
Thu Oct 11, 2018 6:02 pm
Forum: Einstein Equation
Topic: Question on Midterm
Replies: 7
Views: 307

Re: Question on Midterm

Since we will be given a sheet with all the equations and constants on it, we'll just use the constant to as many sig figs as given :)
by Nikki Bych 1I
Thu Oct 11, 2018 5:55 pm
Forum: Properties of Light
Topic: Do I need to memorize the Light Spectrum? [ENDORSED]
Replies: 13
Views: 158

Re: Do I need to memorize the Light Spectrum? [ENDORSED]

There was a problem on the homework (1A.5) that asked to list waves in order of of decreasing wavelength, so maybe if we know the range of each type of wave generally.
by Nikki Bych 1I
Thu Oct 11, 2018 5:47 pm
Forum: Properties of Light
Topic: Unit conversion in 1B.5
Replies: 1
Views: 26

Unit conversion in 1B.5

In problem 1B.5, the energy is in eV, and I couldn't find in the book the conversion factor from eV to joules. Thanks in advance!
by Nikki Bych 1I
Wed Oct 03, 2018 11:23 pm
Forum: Balancing Chemical Reactions
Topic: Order of balancing an equation
Replies: 8
Views: 136

Re: Order of balancing an equation

As a general rule of thumb, I tend to balance the "odd" or weird elements first (basically anything that's not C, H or O) and then go C, H and oxygen last.
by Nikki Bych 1I
Wed Oct 03, 2018 11:16 pm
Forum: SI Units, Unit Conversions
Topic: Question E3 in the textbook
Replies: 2
Views: 71

Re: Question E3 in the textbook

Since the molar mass of gallium is 1/3 the amount of the molar mass of astatine, you need 1/3 gallium atoms for the masses to be equal (1/3 of 210 = 70).
by Nikki Bych 1I
Wed Oct 03, 2018 11:05 pm
Forum: Balancing Chemical Reactions
Topic: Extensive v. Intensive Property [ENDORSED]
Replies: 6
Views: 234

Re: Extensive v. Intensive Property [ENDORSED]

An extensive property is a property that changes depending on the amount, such as volume. An intensive property will stay the same no matter how much or little you have of it, such as density. Say you have a cup of water; if you add more water to it, the volume will change but the density will stay ...

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