Search found 42 matches

by AnvitaaAnandkumar_1B
Tue Nov 19, 2019 7:24 am
Forum: Lewis Structures
Topic: Octet Rule
Replies: 3
Views: 21

Re: Octet Rule

The breaking of the octet rule occurs primarily when the element has empty d orbitals to use for bonding.
This aids in creating the lowest formal charge for the molecule as a whole, but is not directly correlated to making the formal charge for that particular atom zero.
by AnvitaaAnandkumar_1B
Tue Nov 19, 2019 7:22 am
Forum: Dipole Moments
Topic: Cancelling Dipole Moments
Replies: 3
Views: 32

Re: Cancelling Dipole Moments

In general, the molecule doesn't have a net dipole when the orientation of species around the molecule is symmetrical, resulting in a cancelling of dipole moments. In the case of a tetrahedral geometry, the molecule only doesn't have dipole moment when all four species surrounding the central atom a...
by AnvitaaAnandkumar_1B
Tue Nov 19, 2019 7:18 am
Forum: Dipole Moments
Topic: Dipole Moment Arrows
Replies: 1
Views: 17

Re: Dipole Moment Arrows

The direction of the arrow indicates the direction of the dipole. So, dipole arrows should be drawn from positive to negative. That way, the direction the arrow points represents where an electron is more likely to be found.
by AnvitaaAnandkumar_1B
Tue Nov 19, 2019 7:16 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Ion-Dipole
Replies: 2
Views: 10

Re: Ion-Dipole

An ion-dipole interaction is the result of an electrostatic interaction between a charged ion and a molecule that has a dipole. It is an attractive force that is commonly found in solutions, especially ionic compounds dissolved in polar liquids.
by AnvitaaAnandkumar_1B
Tue Nov 19, 2019 7:15 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Strength of Intermolecular Forces
Replies: 3
Views: 12

Re: Strength of Intermolecular Forces

The boiling point of a molecule corresponds to the extent of Hydrogen bonding it undergoes - the greater the amount or strength of the hydrogen bonds, the higher the boiling point.
by AnvitaaAnandkumar_1B
Thu Nov 14, 2019 11:26 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019962

Re: Post All Chemistry Jokes Here

Q. How did the molecular spy introduce himself?
A. My name is Bond.. Covalent Bond.
by AnvitaaAnandkumar_1B
Thu Nov 14, 2019 11:25 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019962

Re: Post All Chemistry Jokes Here

VSEPR jokes
by AnvitaaAnandkumar_1B
Thu Nov 14, 2019 11:18 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Repulsion
Replies: 1
Views: 17

Re: Repulsion

The bonding pair shared in a bond lies further from the atom than a nonbonding pair of that atom which is held close to its positively charged nucleus. Consequently, lone pairs are closer to each other than any other combination of pairs (lone pair-bonding pair and bonding pair-bonding pair), and th...
by AnvitaaAnandkumar_1B
Thu Nov 14, 2019 11:15 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Electrons
Replies: 9
Views: 32

Re: Electrons

Electrons in an atom repel each other due to the fact that they have the same charge The strength of repulsion is such that lone pair- lone pair repulsions > Lone pair - bond pair repulsions > bond pair - bond pair repulsions Thus, by spreading the electrons and ensuring they're far away from each o...
by AnvitaaAnandkumar_1B
Tue Nov 12, 2019 9:34 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019962

Re: Post All Chemistry Jokes Here

Old Chemist One-Liner:
Old chemists never die, they just stop reacting
by AnvitaaAnandkumar_1B
Wed Nov 06, 2019 7:55 am
Forum: Photoelectric Effect
Topic: HW Question Focus 1, 1.3
Replies: 1
Views: 18

Re: HW Question Focus 1, 1.3

I first calculated the energy released per photon - which you get by using E = hc/lambda = 3.14 x 10^(-21) I then calculated the total energy released in a second by multiplying the energy per photon (which I found) with the number of photons produced. I got this value to be 7.536 J. Since the quest...
by AnvitaaAnandkumar_1B
Wed Nov 06, 2019 7:47 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: HW 2D.3
Replies: 5
Views: 39

Re: HW 2D.3

Ba is in the 2nd period of the periodic table i.e it has high metallic character and therefore very low electronegativity while Br is in the 17th period and therefore has high electronegativity. Due to this large difference, the bond is primarily ionic. In addition, on the test, you could also simpl...
by AnvitaaAnandkumar_1B
Wed Nov 06, 2019 7:44 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: How to write p in electron configuration
Replies: 1
Views: 14

Re: How to write p in electron configuration

We don't need to specify the orientation of the orbitals.
So we just need to write p^3
by AnvitaaAnandkumar_1B
Tue Nov 05, 2019 9:12 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019962

Re: Post All Chemistry Jokes Here

A covalent bond yelled at an ionic bond - Didn't anyone ever teach you how to share??
by AnvitaaAnandkumar_1B
Tue Nov 05, 2019 9:05 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: 1D.1
Replies: 1
Views: 21

1D.1

Which of the following increase when the electron in a hydrogen atom undergoes a transition from the 1s-orbital to a 2p-orbital? (a) Energy of the electron. (b) Value of n. (c) Value of l. (d) Radius of the atom.
by AnvitaaAnandkumar_1B
Fri Nov 01, 2019 11:19 am
Forum: Coordinate Covalent Bonds
Topic: Distinguishing a coordinate covalent bond
Replies: 5
Views: 30

Re: Distinguishing a coordinate covalent bond

By determining the difference in electronegativity between the elements.
by AnvitaaAnandkumar_1B
Fri Nov 01, 2019 11:18 am
Forum: Lewis Structures
Topic: Central atom
Replies: 6
Views: 18

Re: Central atom

The central atom is usually the one with the lowest electronegativity or the least numerous element.
by AnvitaaAnandkumar_1B
Wed Oct 30, 2019 4:07 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019962

Re: Post All Chemistry Jokes Here

Q: What emotional disorder does a gas chromatograph suffer from?
A: Separation anxiety.
by AnvitaaAnandkumar_1B
Wed Oct 30, 2019 4:02 pm
Forum: Ionic & Covalent Bonds
Topic: ionic vs covalent bonds
Replies: 6
Views: 32

Re: ionic vs covalent bonds

Yes, pretty much If the difference in electronegativities is greater than 2, the bond will be ionic If the difference in electronegativities is less than 1.5, the bond will be covalent for elements with difference in electronegativity between 1.5 and 2, the compounds will need to be taken on an indi...
by AnvitaaAnandkumar_1B
Wed Oct 30, 2019 4:00 pm
Forum: Ionic & Covalent Bonds
Topic: Self-test 2A.1B
Replies: 1
Views: 22

Self-test 2A.1B

Write the electron configurations of (a) the manganese(II) ion and (b) the
lead(IV) ion.
by AnvitaaAnandkumar_1B
Wed Oct 23, 2019 11:04 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 2
Views: 30

Re: Electron Affinity

Electron affinity describes the amount of energy released or spent when an electron is added to a neutral atom or molecule in the gaseous state to form a negative ion. It therefore tells us about the ease with which an electron can be added to a gaseous molecule. The general trend for electron affin...
by AnvitaaAnandkumar_1B
Wed Oct 23, 2019 10:56 pm
Forum: Ionic & Covalent Bonds
Topic: ground state electron configurations
Replies: 3
Views: 46

Re: ground state electron configurations

I think this question can be solved by looking at a periodic table. (a) [Ar] 3d6 : No. of electrons in M ^+3 state = 18 + 6 = 24 Therefore no. of electrons in M = 24 + 3 = 27 Therefore M is Co (b) [Ar] 3d5 : No. of electrons in M^+3 state = 18 + 5 = 23 Therefore no. of electrons in M = 23 + 3 = 26 T...
by AnvitaaAnandkumar_1B
Wed Oct 23, 2019 12:32 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Planes
Replies: 7
Views: 49

Re: Nodal Planes

Hey! Is there any connection between the location of the nucleus and the nodal plane? Is the nucleus located on the nodal plane, since you cannot find an electron in the nucleus or the nodal plane? A nodal plane will generally include the position of the nucleus as, like you said, you cannot find a...
by AnvitaaAnandkumar_1B
Wed Oct 23, 2019 12:30 pm
Forum: Trends in The Periodic Table
Topic: Shielding
Replies: 7
Views: 32

Re: Shielding

Shielding is essentially the reduction in the effect of the nuclear charge from the nucleus felt by electrons in outer orbitals because they are blocked or "shielded" from the nucleus by the electrons in the inner orbitals
by AnvitaaAnandkumar_1B
Wed Oct 23, 2019 12:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.22
Replies: 1
Views: 22

1E.22

How many unpaired electrons are predicted for the ground-state configuration of each of the following atoms: (a) Pb; (b) Ir; (c) Y; (d) Cd?
by AnvitaaAnandkumar_1B
Wed Oct 23, 2019 12:25 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Self-test 1E.2B
Replies: 2
Views: 19

Self-test 1E.2B

Write the ground-state configuration of an arsenic atom.
by AnvitaaAnandkumar_1B
Thu Oct 17, 2019 4:16 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Planes
Replies: 7
Views: 49

Re: Nodal Planes

Nodal planes denote the areas in which the probability of finding electrons is zero.
Each orbital configuration (s,p,d and f) have different nodal planes.
by AnvitaaAnandkumar_1B
Wed Oct 16, 2019 1:29 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019962

Re: Post All Chemistry Jokes Here

Schrödinger and Heisenberg are driving down the motorway when a cop pulls them over. He walks up to the window and asks, "Sir, do you know how fast you were going?" Heisenberg replies, "No, but i know exactly where I was." The cop, thinking that such a weird response deserves fur...
by AnvitaaAnandkumar_1B
Wed Oct 16, 2019 1:22 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: 1D.4
Replies: 1
Views: 38

Re: 1D.4

For the second part of the question, what changes is the uncertainty in position, delta x. The range of the nuclear diameter is generally taken as 1.7 x 10^(-15) metres. Therefore, you substitute that value into the Heisenberg's indeterminacy equation and calculate the uncertainty in momentum You th...
by AnvitaaAnandkumar_1B
Tue Oct 15, 2019 11:22 pm
Forum: Properties of Light
Topic: 1A.6
Replies: 3
Views: 20

1A.6

Arrange the following types of photons of electromagnetic radiation in order of increasing frequency: visible light, radio waves, ultraviolet radiation, infrared radiation.
by AnvitaaAnandkumar_1B
Sun Oct 13, 2019 8:08 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Self-test 1B.5B
Replies: 1
Views: 27

Self-test 1B.5B

The police are monitoring an automobile of mass 2.0 t (1 t 5 103 kg) speeding along a highway. They are certain of the location of the vehicle only to within 1 m. What is the minimum uncertainty in the speed of the vehicle? Can you use as your defense the argument that the uncertainly principle prev...
by AnvitaaAnandkumar_1B
Sun Oct 13, 2019 9:41 am
Forum: *Black Body Radiation
Topic: Self-test 1B.1B
Replies: 2
Views: 27

Re: Self-test 1B.1B

Thank you!
by AnvitaaAnandkumar_1B
Sun Oct 13, 2019 9:40 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Self-test 1B.4B
Replies: 2
Views: 18

Self-test 1B.4B

Calculate the wavelength of a rifle bullet of mass 5.0 g traveling at twice the speed of sound (the speed of
sound is 331 m?s2 1).
by AnvitaaAnandkumar_1B
Fri Oct 11, 2019 11:01 am
Forum: *Black Body Radiation
Topic: Self-test 1B.1B
Replies: 2
Views: 27

Self-test 1B.1B

A red giant is a late stage in the evolution of a star. The average wavelength maximum at 700. nm shows that a red giant cools as it dies. What is the surface temperature of a red giant?
by AnvitaaAnandkumar_1B
Wed Oct 09, 2019 11:10 am
Forum: Properties of Light
Topic: Self-test 1A.1B
Replies: 4
Views: 28

Self-test 1A.1B

What is the wavelength of the signal from a radio station transmitting at
98.4 MHz?
by AnvitaaAnandkumar_1B
Tue Oct 08, 2019 12:43 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019962

Re: Post All Chemistry Jokes Here

Q: What kind of test do chemistry students like best?
A: Mole-tiple choice.
by AnvitaaAnandkumar_1B
Fri Oct 04, 2019 12:12 am
Forum: Molarity, Solutions, Dilutions
Topic: G 13
Replies: 3
Views: 39

Re: G 13

To solve this we use the dilution law : M1V1 = M2V2. M1 = 0.20M . M2 = V1 = 1 l . V2 = 1 + 3 = 4 l Substituting in the equation, we get M2 = 0.05M Molarity = (No. of moles) divided by (volume in litres) Therefore, 0.05 = (n x 1000)/ 100 = 0.005 moles of NH4NO3 Each mole of NH4NO3 has 2 moles of N th...
by AnvitaaAnandkumar_1B
Thu Oct 03, 2019 8:34 pm
Forum: Molarity, Solutions, Dilutions
Topic: Self test G2B
Replies: 1
Views: 31

Self test G2B

Calculate the mass of oxalic acid needed to prepare 50.00 mL of 0.125 m C2H2O4(aq).
by AnvitaaAnandkumar_1B
Thu Oct 03, 2019 6:35 pm
Forum: Empirical & Molecular Formulas
Topic: F24
Replies: 1
Views: 56

F24

Dolomite is a mixed carbonate of calcium and magnesium. Calcium and magnesium carbonates both decompose upon heat- ing to produce the metal oxides (MgO and CaO) and carbon dioxide (CO2). If 5.12 g of residue consisting of MgO and CaO remains when 10.04 g of dolomite is heated until decomposition is ...
by AnvitaaAnandkumar_1B
Tue Oct 01, 2019 8:49 pm
Forum: Molarity, Solutions, Dilutions
Topic: Average molar mass
Replies: 2
Views: 31

Average molar mass

In the text under section E, in order to find the average molar mass for elements that have isotopes, they have first found the average atomic mass and then multiplied by Avogadro's constant to get the average molar mass. However, if in a question we are presented with the atomic mass, molar mass nu...
by AnvitaaAnandkumar_1B
Tue Oct 01, 2019 8:44 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity Self test E1B
Replies: 2
Views: 18

Re: Molarity Self test E1B

Thanks!
by AnvitaaAnandkumar_1B
Tue Oct 01, 2019 8:30 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity Self test E1B
Replies: 2
Views: 18

Molarity Self test E1B

A double espresso contains 3.14 mol H2O. What is the number of H atoms present in the espresso?

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