Search found 31 matches
- Fri Dec 07, 2018 4:01 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: identify base/acid from lewis structure
- Replies: 2
- Views: 272
Re: identify base/acid from lewis structure
Generally, a molecule with lone pairs on central atom will be electron donor which is Lewis base, and if the central atom has only six valence electrons it’s Lewis acid because it will be electron acceptor.
- Thu Dec 06, 2018 10:45 pm
- Forum: Lewis Acids & Bases
- Topic: Electron Withdrawing Atoms?
- Replies: 1
- Views: 238
Electron Withdrawing Atoms?
What is electron withdrawing atoms which delocalize and stablize the negative charge? (What exactly does "withdrawing electron" means? What are some examples of such atoms?)
- Thu Dec 06, 2018 11:58 am
- Forum: Bronsted Acids & Bases
- Topic: 6th 12.9c
- Replies: 1
- Views: 294
6th 12.9c
(c) CH3COOH(aq) + NH3(aq) --> CH3CONH2(aq) + H2O(l)
Why isn't it an acid-base reaction?
Why isn't it an acid-base reaction?
- Wed Nov 28, 2018 11:24 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity of CH2Cl2
- Replies: 2
- Views: 594
Polarity of CH2Cl2
In 6th edition question 4.25, the answer key suggest that CH2Cl2 is polar. But if we draw the lewis structure in which the two Cl atoms are opposite to each other, wouldn't the charge cancel out and make the molecule nonpolar? How do we know which way to draw?
- Wed Nov 28, 2018 10:50 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: SnCl2
- Replies: 2
- Views: 3455
SnCl2
Why is Sn an exception to the octet rule? (In SnCl2, Sn only has 2 single bonds and a lone pair)
- Wed Nov 28, 2018 10:48 pm
- Forum: Bond Lengths & Energies
- Topic: Interaction Potential Energy and Polarizability
- Replies: 1
- Views: 705
Interaction Potential Energy and Polarizability
Could someone explain what is the interaction potential energy and what is polarizability? Is the potential always negative? Why?
- Sun Nov 25, 2018 10:33 pm
- Forum: Hybridization
- Topic: Test 3
- Replies: 7
- Views: 860
Re: Test 3
Is test 3 next Friday? Yeah I wonder what will be covered too.
- Sun Nov 25, 2018 10:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angle
- Replies: 3
- Views: 318
Bond angle
Do we have to remember the exact bond angle of shapes with lone pairs(e.g. bent) or we just have to say less than the bond angle with the respective shape without lone pairs?
- Sun Nov 25, 2018 10:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Naming the Shape
- Replies: 16
- Views: 1211
Re: Naming the Shape
You can remember them by each electron geometries. For instance, start with AX6, which is octahedral in both electron and molecular geometry. Then replace one atom with lone pair(AX5E, which is square pyramidal, etc
- Sun Nov 18, 2018 9:39 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Resonance Structures and bond angles
- Replies: 4
- Views: 2218
Re: Resonance Structures and bond angles
No, the bond angle is only associated with the molecular shape and number of lone electron pairs.
- Sun Nov 18, 2018 9:36 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polar molecules
- Replies: 5
- Views: 757
Re: Polar molecules
Your explanation is basically right. The lone pair also has a strong negative charge, and there's nothing at the opposite side to cancel it out, making the molecule polar.
- Thu Nov 15, 2018 11:17 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lewis and VSEPR for I3-
- Replies: 3
- Views: 3064
Lewis and VSEPR for I3-
What is the Lewis model and VSEPR formula for I3-?
- Sun Nov 11, 2018 11:32 pm
- Forum: Lewis Structures
- Topic: Noble Gas Valence Electrons
- Replies: 3
- Views: 405
Re: Noble Gas Valence Electrons
Because the VSEPR theory predicts that XeF₂ is linear, and Xe needs 3 lone pairs in order to maintain the linear structure of the molecule.
- Sun Nov 11, 2018 11:29 pm
- Forum: Lewis Structures
- Topic: Poly-atomic Ions
- Replies: 2
- Views: 346
Re: Poly-atomic Ions
The negative charge goes to the most electronegative atom and the positive charge goes to the least electronegative atom. The position doesn't really matter.
- Sun Nov 11, 2018 11:27 pm
- Forum: Lewis Structures
- Topic: VSEPR theory
- Replies: 1
- Views: 240
Re: VSEPR theory
Because bonding e- don't move around as much as lone pair e-, reducing the chance of getting closer to other e- and repel them. They have less energy too.
- Sun Nov 04, 2018 8:54 pm
- Forum: Lewis Structures
- Topic: What is the maximum oxidation number of chlorine? Why?
- Replies: 1
- Views: 173
Re: What is the maximum oxidation number of chlorine? Why?
Okay I get it now, it's because Cl reaches noble gas config this way. But it oxidation number the same as number of gained/lost electrons?
- Sun Nov 04, 2018 8:45 pm
- Forum: Lewis Structures
- Topic: What is the maximum oxidation number of chlorine? Why?
- Replies: 1
- Views: 173
What is the maximum oxidation number of chlorine? Why?
The answer is +7, but I don't get the reason behind it.
- Thu Nov 01, 2018 2:12 pm
- Forum: Trends in The Periodic Table
- Topic: Why is ionization energy of oxygen lower than nitrogen?
- Replies: 2
- Views: 43047
Why is ionization energy of oxygen lower than nitrogen?
According to periodic trend, I.E. increases from left to right, but O is lower than N
- Thu Nov 01, 2018 2:06 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: What is the notation for the valence-shell configuration?
- Replies: 2
- Views: 300
What is the notation for the valence-shell configuration?
Give the notation for the valence-shell confi guration (including the outermost d-electrons) of (a) the alkali metals; (b) Group 15 elements; (c) Group 5 transition metals; (d) “coinage” metals (Cu, Ag, Au).
Can someone explain what does "notation" mean?
Can someone explain what does "notation" mean?
- Wed Oct 31, 2018 9:44 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Is electron removed from 3d or 4s first?
- Replies: 5
- Views: 47976
Is electron removed from 3d or 4s first?
For example, for the element Mn, when forming a +1 ion is electron removed from 3d or 4s orbital first? Why?
- Wed Oct 31, 2018 9:31 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Shielding Question
- Replies: 1
- Views: 223
Shielding Question
Is the following statements true for multi-electron atoms? Why? -Electrons in an s-orbital are more effective than those in other orbitals at shielding other electrons from the nuclear charge because an electron in an s-orbital can penetrate to the nucleus of the atom. Electrons having l = 2 are bet...
- Sun Oct 28, 2018 9:56 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: nodal/radial planes
- Replies: 5
- Views: 561
Re: nodal/radial planes
Yes, when the wave function passes zero, its probability density(which is its derivative) is also zero, thus making it a nodal plane.
- Sun Oct 28, 2018 9:52 pm
- Forum: *Shrodinger Equation
- Topic: H(psi)=E(psi) Equation
- Replies: 2
- Views: 967
Re: H(psi)=E(psi) Equation
You just need to understand its concept, not actually using it, so I think you should be fine.
- Thu Oct 25, 2018 11:39 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: atomic orbital and molecular orbital?
- Replies: 2
- Views: 435
atomic orbital and molecular orbital?
What is the difference between electronic transitions in atomic orbitals (atomic spectroscopy) and electronic transitions in molecular orbitals (molecular spectroscopy)?
- Thu Oct 25, 2018 6:48 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Balmer Series?
- Replies: 1
- Views: 176
Balmer Series?
Can someone explain to me what is Balmer series and what does those lines represents? I kind of know how to use the equation to solve problems but I'm struggling conceptually. (I was working on Q1.57 on 6th edition)
- Sun Oct 21, 2018 11:25 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: About Uncertainty in position
- Replies: 3
- Views: 380
About Uncertainty in position
What is the minimum uncertainty in the speed of an electron confined to within a lead atom of diameter 350. pm?
Is the uncertainty in position 350. pm in this problem?
Is the uncertainty in position 350. pm in this problem?
- Sun Oct 21, 2018 11:04 pm
- Forum: *Shrodinger Equation
- Topic: What is probability density?
- Replies: 2
- Views: 2820
What is probability density?
Why is the square of the wavefunction(psi) the probability density? What is it exactly? (I read the textbook but it doesn't make a lot of sense to me...)
- Fri Oct 19, 2018 1:18 am
- Forum: DeBroglie Equation
- Topic: 6th HW 1.23 What is KeV?
- Replies: 5
- Views: 1416
6th HW 1.23 What is KeV?
What is KeV? When you see it as the unit of energy, do you use E=hv or lamba=h/p?
Problem: 1.23 The y-ray photons emitted by the nuclear decay of a technetium-99 atom used in radiopharmaceuticals have an energy of 140.511 keV. Calculate the wavelength of these y-rays.
Problem: 1.23 The y-ray photons emitted by the nuclear decay of a technetium-99 atom used in radiopharmaceuticals have an energy of 140.511 keV. Calculate the wavelength of these y-rays.
- Sun Oct 14, 2018 10:31 pm
- Forum: Properties of Light
- Topic: 6th Edition homework 1.37 wavelength of protons and neutrons
- Replies: 2
- Views: 124
6th Edition homework 1.37 wavelength of protons and neutrons
Protons and neutrons have nearly the same mass. How different are their wavelengths? Calculate the wavelength of each particle when traveling at 2.75 = 105 m/s in a particle accelerator and report the difference as a percentage of the wavelength of the neutron. How do you do this without knowing pro...
- Sun Oct 14, 2018 10:24 pm
- Forum: Properties of Light
- Topic: 6th edition homework 1.13 Rydberg Formula
- Replies: 1
- Views: 117
6th edition homework 1.13 Rydberg Formula
Use the Rydberg formula for atomic hydrogen to calculate the wavelength of radiation generated by the transition from n = 4 to n = 2.
What is Rydberg formula?
What is Rydberg formula?
- Thu Oct 11, 2018 10:25 pm
- Forum: Properties of Light
- Topic: Homework Question 1.3, 6th Edition
- Replies: 2
- Views: 271
Homework Question 1.3, 6th Edition
Does this happen when the frequency of light decreases? Why?
(c) The extent of the change in the electrical field at a given
point decreases.
(c) The extent of the change in the electrical field at a given
point decreases.