Search found 10 matches

by Sedra_Tibi_1L
Tue Nov 29, 2016 1:38 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH and Kp/Ka
Replies: 1
Views: 827

Re: pH and Kp/Ka

pKa describes the dissociation constant in a buffer solution, how the pH changes in the buffer. They are numerically related through the Henderson-Hasselbalch equation, pH=pKa+log10([A-]/[HA]). You can tell if the solution is acidic or basic based on the Ka. If the Ka is larger than the Kb, (use the...
by Sedra_Tibi_1L
Mon Nov 21, 2016 5:04 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Relative Acidity
Replies: 1
Views: 303

Relative Acidity

I just wanted to clarify the two main properties that makes an acid strong/weak. 1) The longer the bond, the easier it is to remove the H+ proton, so the more acidic the compound is. 2) The higher the electronegativity difference=the higher the resonance=the more delocalization=the more stable the c...
by Sedra_Tibi_1L
Tue Nov 15, 2016 10:28 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp
Replies: 6
Views: 1104

Re: Kp

We don't include solids and liquids in both Kc and Kp. We don't include them in any equilibrium constants because solids and liquids don't affect the reaction reaching equilibrium. Equilibrium constants only depend on the gases and aqueous solutions included in the reaction.
by Sedra_Tibi_1L
Mon Nov 07, 2016 5:42 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Homework 17.33
Replies: 7
Views: 746

Re: Homework 17.33

A polydentate is a ligand that bonds to more than one site simultaneously, for example, bidentate (2 different bonding regions). Coordination compounds are made up of ligands that bond to the central atom. The central atom is usually the metal or cation.
by Sedra_Tibi_1L
Wed Nov 02, 2016 8:54 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Hw 4
Replies: 1
Views: 274

Re: Hw 4

An angular molecular shape is the same thing as bent. There are two types of shapes that can be called "bent" or "angular". The first is a molecule with the central atom having three areas of electron density, with two atoms and one lone pair. The other type of bent/angular shape...
by Sedra_Tibi_1L
Tue Oct 25, 2016 11:33 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Quiz 2 Prep #4
Replies: 1
Views: 326

Quiz 2 Prep #4

In the course reader, it explains that atoms with an atomic number (Z) of 20 and less have their 3d orbital in lower energy than 4s (with 4s occupied and after entering the 3d state). Does this mean for number four in the Quiz 2 Prep that Cl^2- places its extra electron into the 4s orbital, not the ...
by Sedra_Tibi_1L
Tue Oct 18, 2016 5:16 pm
Forum: Resonance Structures
Topic: Delocalization of Electrons [ENDORSED]
Replies: 1
Views: 294

Delocalization of Electrons [ENDORSED]

I don't fully understand the meaning of an electron being delocalized. If in resonance structures, delocalization of electrons means that the electron can be found in multiple possible places, are delocalized electrons only found in resonance structures? Why?
by Sedra_Tibi_1L
Wed Oct 12, 2016 12:07 pm
Forum: Trends in The Periodic Table
Topic: Ionic Radius of Ions
Replies: 2
Views: 474

Re: Ionic Radius of Ions

For atomic radius, anions are always larger, with a larger atomic radius, than their neutral atom counterparts. The more electrons the atom gains, the larger the atomic radius for become. In this case, S^2-, Cl^-< and P^3- are isoelectronic, meaning they have the same number of electrons. So we look...
by Sedra_Tibi_1L
Tue Oct 04, 2016 10:29 am
Forum: Properties of Light
Topic: HW Prob. Ch1 #25 [ENDORSED]
Replies: 3
Views: 462

HW Prob. Ch1 #25 [ENDORSED]

The problem is asking us to find the energy emitted, and we are given that the wavelength is 589nm. In part b, we are given that there are 5.00mg of sodium in this wavelength. In the solutions, grams is converted to moles, converted to number of atoms. Then, it is multiplied by 3.37x10^-19 J/atom. W...
by Sedra_Tibi_1L
Fri Sep 30, 2016 9:56 am
Forum: Properties of Light
Topic: Frequency, wavelength, and Energy of light
Replies: 5
Views: 558

Re: Frequency, wavelength, and Energy of light

Energy of a wave, measured in just Joules, is the energy of the whole wave, while intensity of a wave is measured in Joules per second per meter, so intensity measures the number of photons going through a single particle of the wave. Energy measures all the energy transmitted by the wave. Overall, ...

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