Search found 21 matches

by Angelica Mercado 1A
Thu Dec 07, 2017 1:30 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Base of CH3COOH
Replies: 3
Views: 742

Conjugate Base of CH3COOH

I know that the formula for the conjugate base of CH3COOH would simply be created by removing an H+ ion which leaves us with CH3COO- but I'm wondering if writing it like CH3COO- is incorrect or if this is simply the equivalent of CH3CO2- and has no effect on the accuracy of my answer?
by Angelica Mercado 1A
Wed Dec 06, 2017 9:56 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acids and Bases versus Lewis Acids and Bases
Replies: 3
Views: 387

Re: Bronsted Acids and Bases versus Lewis Acids and Bases

The Lewis definition of an acid/base focuses on where electron move to (i.e. acids have an empty orbital), while the Bronsted definition focuses on where protons move to (i.e. acids have to have a proton to donate).
by Angelica Mercado 1A
Wed Dec 06, 2017 9:43 pm
Forum: Conjugate Acids & Bases
Topic: Acid/Base Interaction
Replies: 1
Views: 180

Acid/Base Interaction

If there's no conjugate base/acids on the products side of a reaction does that indicate that this reaction was not an acid/base interaction?
by Angelica Mercado 1A
Sun Dec 03, 2017 10:47 pm
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 2
Views: 274

Re: Dipole Moments

The lone pairs on the central atom don't contribute to the dipole. The dipole moment is determined by the differences in the electronegativity of the atoms, but the lone pairs on the central atom of a molecule can affect the net dipole as they can change the shape of a molecule to create dipole mome...
by Angelica Mercado 1A
Sun Dec 03, 2017 10:07 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Noble Gas increasing pressure
Replies: 3
Views: 441

Re: Noble Gas increasing pressure

When a noble gas is added to the system in equilibrium at a constant volume, the total pressure will increase. But the concentrations of the products and reactants will not change because the ratio of their moles to the volume of the container isn't changed. This is why when a noble gas is added to ...
by Angelica Mercado 1A
Sun Nov 26, 2017 5:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Molecules in Subscript
Replies: 3
Views: 265

Re: Molecules in Subscript

K is unitless because the the units of equilibrium partial pressure of a certain gas (P molecule ) are canceled by the units of standard pressure, hence you would need to write the molecules as a subscript of P. P molecule is then understood to be the numerical value of the pressure in bar (bar bein...
by Angelica Mercado 1A
Sun Nov 26, 2017 5:23 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: partial pressure
Replies: 3
Views: 211

Re: partial pressure

When asked for equilibrium of a reaction with gases, you would only express the equilibrium constant in partial pressure (Kp) if those are the units you are asked for, it doesn't matter if you are given a gas. So it only depends on what is being asked- if you're given Kc of the gases then you would ...
by Angelica Mercado 1A
Fri Nov 17, 2017 9:13 pm
Forum: Sigma & Pi Bonds
Topic: Bonding
Replies: 2
Views: 300

Re: Bonding

Also, a sigma bond allows the bound atoms to rotate which means the bond has electron density with cylindrical symmetry around the internuclear axis. Pi bonds don't allow bound atoms to rotate and there's electron density above and below the internuclear axis.
by Angelica Mercado 1A
Fri Nov 17, 2017 8:40 pm
Forum: Dipole Moments
Topic: Polar molecules relation to lone pair electrons
Replies: 2
Views: 270

Re: Polar molecules relation to lone pair electrons

The lone pairs have to be found on the central atom in order to affect the shape of a molecule (i.e. from a straight to a bent shape) which then affects the polarity of the molecule because some dipoles might start or stop cancelling each other out. Lone pairs can also contribute to the molecule's d...
by Angelica Mercado 1A
Wed Nov 08, 2017 10:58 pm
Forum: Lewis Structures
Topic: Central Atom? [ENDORSED]
Replies: 7
Views: 1040

Re: Central Atom? [ENDORSED]

I was wondering why Hydrogen is never the central atom despite sometimes being the atom with the least ionization energy in a molecule?
by Angelica Mercado 1A
Wed Nov 08, 2017 10:50 pm
Forum: Lewis Structures
Topic: where do you place the unpaired electron of a free radical?
Replies: 2
Views: 286

Re: where do you place the unpaired electron of a free radical?

The atom that is least electronegative gets the unpaired electron. Periodic trends tell us that electronegativity decreases as you go down a group, and increases left to right across a period. Cl is less electronegative.
by Angelica Mercado 1A
Fri Nov 03, 2017 12:39 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Problem for a Peer Learning Session
Replies: 3
Views: 268

Re: Problem for a Peer Learning Session

The s subshell will lose it's electrons instead of taking it from the d orbital To expand on this, the 4s electrons are lost rather than the electrons from the d orbital because although 4s is lower in energy than 3d at first- once the 3d sublevel is filled with electrons the 4s ends up with a high...
by Angelica Mercado 1A
Fri Nov 03, 2017 12:15 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent/ Ionic Bond
Replies: 5
Views: 369

Re: Covalent/ Ionic Bond

A rough guideline to follow is that you can identify an ionic bond if the bonded elements have an electronegativity difference greater than 2. A covalent bond would typically have an electronegativity less than 1.5. Since electronegativity increases as you go left to right across a period then we ca...
by Angelica Mercado 1A
Sun Oct 29, 2017 3:38 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Exercise 1.45
Replies: 4
Views: 351

Re: Exercise 1.45

The +/- part indicates a range of uncertainty, which is why you get the absolute value of +5 and -5 to get the indeterminacy of velocity variable, 10. But I'm also wondering why the solutions manual doesn't subsitute delta v with 10, rather than just 5m/s^-1?
by Angelica Mercado 1A
Sun Oct 29, 2017 3:16 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Understadning Heisenberg Indeterminacy Equation
Replies: 6
Views: 553

Re: Understadning Heisenberg Indeterminacy Equation

What is the importance of h/4pi? Where does the 4pi come from? H bar just means h/2pi. The equation is delta p by delta x is greater than or equal to half of h bar - which is why there's 4pi. h/2pi (h bar) multiplied by 1/2 gives you the h/4pi. Apparently h bar or h/2pi is just a "useful combi...
by Angelica Mercado 1A
Sun Oct 29, 2017 3:03 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Equal or greater than or equal to sign?
Replies: 3
Views: 246

Re: Equal or greater than or equal to sign?

We would put our final delta answer as greater than or equal to because we solved for the minimum uncertainty- so if you were asked for the minimum uncertainty of something, you would then use an equal sign. We're uncertain about the exact value otherwise so we give a range up from a minimum.
by Angelica Mercado 1A
Thu Oct 26, 2017 10:02 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question on the difference between quantum numbers l and ml.
Replies: 3
Views: 336

Re: Question on the difference between quantum numbers l and ml.

In layman terms, l essentially tells us the speed of the electron's rotation around the nucleus, and ml tells us the orientation/ angle of this rotation.
by Angelica Mercado 1A
Thu Oct 26, 2017 4:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Exceptions to Electron Configuration [ENDORSED]
Replies: 5
Views: 1025

Re: Exceptions to Electron Configuration [ENDORSED]

Copper and Chromium are the only exceptions to the Aufbau principle because they want to have a symmetrical distribution of electrons since this would make the elements more stable. Copper wants to have its sublevel full (3d10 instead of 3d9) and Chromium wants to keep its sublevel half-filled (3d5 ...
by Angelica Mercado 1A
Mon Oct 09, 2017 9:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Models of Atoms- Question 2.31
Replies: 4
Views: 300

Models of Atoms- Question 2.31

Which of the following subshells cannot exist in an atom:
(a) 2d; (b) 4d; (c) 4g; (d) 6f?
Why would subshell 2d not be able to exist in an atom if when the value of l is 2, the orbital type is d?
by Angelica Mercado 1A
Thu Oct 05, 2017 10:36 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units
Replies: 2
Views: 296

Formula Units

What is a formula unit? Does this by default always indicate the same thing, or does the definition change depending on the context of the problem?
by Angelica Mercado 1A
Thu Oct 05, 2017 3:21 pm
Forum: Molarity, Solutions, Dilutions
Topic: E1
Replies: 1
Views: 241

E1

Suppose you were able to string together 1.00 mol AG atoms, each of radius 144 pm, into a fiber (one atom wide) by encapsulating them in carbon nanotubes. How long would the fiber extend? The question provides the radius of 1 Ag atom, 144 pm. Why can't I just solve for the length of the extended fib...

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