CHEMISTRY COMMUNITY

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Why are chemists great for solving problems? Because they always have a solution!

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For the reversible, one‑step reaction, A+A⥫⥬=k−1k1B+C the rate constant for the forward reaction, k1 , is 299 L⋅mol−1⋅min−1 and the rate constant for the reverse reaction, k1 , is 365 L⋅mol−1⋅min−1 at a given temperature. The activation energy for the forward reaction is 44.5 kJ⋅mol−1 , whereas the ...

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The presence of a catalyst provides a reaction pathway in which the activation energy of a reaction is reduced by 54.00 kJ⋅mol−1 . Uncatalyzed: A⟶B Ea=122.00 kJ⋅mol−1 Catalyzed: A⟶B Ea=68.00 kJ⋅mol−1 Determine the factor by which the catalyzed reaction is faster than the uncatalyzed reaction at 289....

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Calculate the activation energy, Ea , in kilojoules per mole for a reaction at 75.0 ∘C that has a rate constant of 0.296 s−1 and a frequency factor of 9.95×1011 s−1 .

Can someone explain how to do this?

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The mechanism proposed for the oxidation of iodide ion, I−, by the hypochlorite ion, ClO−, in aqueous solution is shown. ClO−(aq)+H2O(l)⇌HClO(aq)+OH−(aq)fast in both directions I−(aq)+HClO(aq)→HIO(aq)+Cl−(aq) slow HIO(aq)+OH−(aq)→IO−(aq)+H2O(l) fast Complete the rate law for the formation of IO− imp...

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For the reaction

2A(g)+2B(g)+C(g)⟶3G(g)+4F(g)

the initial rate data in the table was collected, where [A]0 , [B]0 , and [C]0 are the initial concentrations of A , B , and C , respectively.

Can someone explain how to set this up?

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Only one more test to go!

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Last quarter it focused mainly on the material after Midterm 2 but still had a good amount of material from the other two midterms.

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I miss being able to meet new people in classes and do work on campus.

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I have recently been watching Designated Survivor on Netflix!

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My favorite food is pad Thai with peanut sauce!

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Separate this redox reaction into its balanced component half‑reactions. Use the symbol e− for an electron.

Cl2+2Cu⟶2CuCl

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For a particular redox reaction, Cr is oxidized to CrO2−4 and Cu2+ is reduced to Cu+ . Complete and balance the equation for this reaction in basic solution. The phases are optional.

Can someone explain?

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What did one charged atom say to the other? I got my ion you!

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What's the dullest element? Bohrium!

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Why did the attacking army use acid? To neutralize the enemy's base!

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You are right When work is done by the system it is negative work and when work is done on the system it is positive work.

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Carbon and hydrogen went on a date. I heard they really bonded

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I like to hear chemistry puns, periodically.

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Lose an electron?

Gotta keep an ion it.

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Based on last quarter I doubt he will curve anything.

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Chewing always helps with my nervous energy during tests.

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At the top click on Quick links and then there should be a drop down menu where you can find your posts.

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I love sushi!

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I had to make these bad chemistry jokes because all the good ones Argon.

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Try to break up your studying so you aren't overwhelmed the day before.

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For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 bar for all species. For the reaction N2(g)+3H2(g)↽−−⇀2NH3(g) the standard change in Gibbs free energy is ΔG∘=−32.8 kJ/mol. What is ΔG for this reaction at 298 K when the partial pressures are PN2=0.250 bar, PH2=0.300 ...

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The name's Bond. Ionic Bond. Taken, not shared.

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Did you hear oxygen went on a date with potassium?
It went OK.

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What was Avogadro's favorite sport? Golf!

He always got a mole-in-one!

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Why are chemists great for solving problems?

Because they always have a solution!

805377003

What did one charged atom say to the other?

I got my ion you!

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An ice cube with a mass of 48.8 g at 0.0 ∘C is added to a glass containing 397 g of water at 45.0 ∘C . Determine the final temperature of the system at equilibrium. The specific heat capacity of water, Cs , is 4.184 J/g⋅∘C , and the standard enthalpy of fusion, ΔH∘fus , of water is 6.01×103 J/mol . ...

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To relax I watch a Netflix show that I find enjoyable, to get my mind off of school.

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Helium walks into a bar,
The bar tender says "We don't serve noble gasses in here."
Helium doesn't react.

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Anyone know any jokes about sodium?
Na

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Did you hear oxygen went on a date with potassium?

It went OK.

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What is the chemical formula for "coffee"?

CoFe2

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Have you heard the one about a chemist who was reading a book about helium?
He just couldn't put it down.

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Can someone explain how to do this?

CH4(g)+2O2(g)⟶CO2(g)+2H2O(l)

enthalpy of combustion of CH4

4×bond energy of C−H

−4×bond energy of C−H

enthalpy of formation of CO2(g)

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I believe it should be the same but the exam time is during lecture time instead of discussion time.

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It should be information on Weeks 1-3.

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The Kb for an amine is 4.352×10−5. What percentage of the amine is protonated if the pH of a solution of the amine is 9.258 ? Assume that all OH− came from the reaction of B with H2O.

Can someone explain this?

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There is usually plenty of time to complete the problems. Our midterms had between 10-13 problems last quarter. Make sure your respondus is working before you attempt to take the midterm because that can be stressful.

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On sapling problem number six I am having hard time identifying which are acidic, basic, or neutral. Can someone explain how you can tell?

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At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.100 M and [NO]=0.600 M. N2(g)+O2(g)↽−−⇀2NO(g) If more NO is added, bringing its concentration to 0.900 M, what will the final concentration of NO be after equilibrium is re‑established? I've attempted this problem but I k...

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Now we're making bad chemistry jokes because all the good ones Argon

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What is the chemical formula for “banana”?
BaNa2

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Consider this system at equilibrium. A(aq)↽−−⇀B(aq)ΔH=+550 kJ/mol What can be said about Q and K immediately after an increase in temperature? Q > K because K decreased. Q < K because K increased. Q > K because Q increased. Q < K because Q decreased. Q = K because neither changed. How will the syste...

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Consider the reaction of NH3 and I2 to give N2 and HI. 2NH3(g)+3I2(g)↽−−⇀N2(g)+6HI(g)K Using two or more of the given equations, determine the equilibrium constant, K , for the reaction of NH3 with I2. H2(g)+I2(g)↽−−⇀2HI(g)I2(g)↽−−⇀2I(g)N2(g)+3H2(g)↽−−⇀2NH3(g)H2(g)+Cl2(g)↽−−⇀2HCl(g)Ka=160 Kb=2.1×10−...

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What did one ion say to the other?

I've got my ion you.

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What element is a girl's future best friend?
Carbon

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What do you call a tooth in a glass of water?

One molar solution.

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What did the scientist say when he found 2 isotopes of helium?
HeHe

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Don't trust atoms, they make up everything.

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At a certain temperature, the equilibrium constant, Kc, for this reaction is 53.3.

H2(g)+I2(g)↽−−⇀2HI(g)Kc=53.3

At this temperature, 0.300 mol H2 and 0.300 mol I2 were placed in a 1.00 L container to react. What concentration of HI is present at equilibrium?

Can someone explain this?

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I had Dr. Lavelle last quarter and used Sapling to complete homework, but when I try to access Sapling learning through the CCLE it says I need a new code. Is anyone else having this problem and know how to fix it?

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Old chemists never die. They just stop reacting!

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Wait, are all these jokes too basic for you? Because I see no reaction.

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What do you call a clown in jail? A Silicon!

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What did silver say to gold at the bar? "Au, get outta here!"

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Why are chemists great for solving problems? Because they always have a solution!

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What did one charged atom say to the other? I got my ion you!

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What do you do with a dead chemist?
Barium

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Silver walks up to Gold in a bar and says, "AU, get outta here!"

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Why do chemists like nitrates so much?
They're cheaper than day rates.

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How about the chemical workers… are they unionized?

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Don't trust atoms, they make up everything.

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I am curious about this as well. He will probably send an email out soon.

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Consider the different about of bonds carbon can have and if they can form a ring structures. As a hint the carbons may form a trigonal shape.

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The night before take some time to relax. There is no point trying to cram information in the last minute. I recommend taking this time to give your brain a rest and do something you enjoy and then get a good nights rest.

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They haven't mentioned how it will be proctored but they did say that it is during a specific time.

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A week before I am going to start reviewing the old material and then slowly work my way to the new material by doing the practice problems.

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All of the structures are very similar, but differ in the number of carbons. Follow the octet rule and draw the Lewis structure with this.

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I looked up diagrams online and look at those to try and memorize them.

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I don't believe that extra credit will be offered.

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I would assume that he would post a lecture since he posted one on Veterans.

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I always find it helpful to do some self care before an exam.

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Identify the axial and equatorial atoms in the three‑dimensional structure.

How do you identify the axial atoms vs. the equatorial atoms in the 3-d structure.

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What is the molecular shape of sulfite ion?
Can someone explain this?

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Suggest, giving reasons, which substance in each of the following pairs is likely to have the higher normal melting point (Lewis structures may help your arguments): (a) HCl HCl or NaCl NaCl; (b) C 2 H 5 OC 2 H 5 (diethyl ether) or C 4 H 9 OH (butanol); (c) CHI 3 or CHF 3 ; (d) C 2 H 4 or CH 3 OH . ...

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3F.3 For which of the following molecules will dipole–dipole interactions be important: (a) CH 4 ; (b) CH 3 Cl ; (c) CH 2 Cl 2 ; (d) CHCl 3 ; (e) CCl 4 ?

Can someone explain this?

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3F.15 Explain the difference in the boiling points of AsF 3 ( 63 ) °C and AsF 5 ( − 53 ) °C.
Can someone explain this?

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Can someone explain this problem?

Write the most likely charge for the ions formed by each of the following elements: (a) S; (b) Te; (c) Rb; (d) Ga; (e) Cd.

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Can someone explain how to do this problem?

Give the notation for the valence-shell configuration (including the outermost d-electrons) of (a) the alkali metals; (b) Group 15 elements; (c) Group 5 transition metals; (d) the “coinage” metals (Cu, Ag, Au).

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Can someone explain the answer to this?

How many values of ml are allowed for an electron in a 6d-subshell?

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Can someone explain how to do this problem? The formulas of the bromate ion, BrO−3, and chlorate ion, ClO−3, are very similar. However, the formulas of the nitrate ion and phosphate ion contain different numbers of oxygen atoms. This is also true for the formulas of the nitrite ion and phosphite ion...

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Want to hear a joke about nitrogen oxide? NO!

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Anyone know any jokes about sodium? Na

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Did you hear oxygen went on a date with potassium? It went OK!

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At the top of the page their is an option to see all your posts and it will say how many times you've posted.

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Spacing my studying out over time always helps the most.

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I only purchased the online textbook and sapling for $70. It was on Lavelles website.

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As far as I know there aren't any more modules.

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No information has been given out about the midterm. You didn't miss anything!

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I believe so since it is a constant.

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I put headphones on that are noise canceling and this helps a lot.

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I love to watch Netflix.

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When do we find out our midterm grades?

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I recommend doing all the textbook problems and practicing all the homework problems.

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