Search found 48 matches

by Armen_Isayan_3F
Sun Nov 29, 2020 11:32 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Polarity
Replies: 10
Views: 34

Re: Polarity

A molecule that has a lone pair is not necessarily always polar, most of the time it is, however, the arrangement of the molecule, if it is symmetrical, plays a significant role in determining its polarity.
by Armen_Isayan_3F
Sun Nov 29, 2020 10:41 pm
Forum: Sigma & Pi Bonds
Topic: Pi Bonds
Replies: 3
Views: 16

Re: Pi Bonds

Hello, Pi bonds are solely applicable to covalent bonds! In essence, they are covalent bonds thare able to form into double or triple bonds, but do not form into single bonds.
by Armen_Isayan_3F
Sun Nov 29, 2020 10:40 pm
Forum: Sigma & Pi Bonds
Topic: Delocalized and Localized Bonds
Replies: 4
Views: 11

Re: Delocalized and Localized Bonds

Hello! the difference between a localized and delocalized bond is that the electrons remain close to the atom, and it travels between the two atoms. On the other hand, a delocaized bond is indicative of electrons that do not remain close to one atom, but instead are close to two atoms, visiting both.
by Armen_Isayan_3F
Sun Nov 29, 2020 10:35 pm
Forum: Sigma & Pi Bonds
Topic: Pi Bond and Pi Molecular Orbital
Replies: 1
Views: 11

Re: Pi Bond and Pi Molecular Orbital

Hello! The distinction between a Pi bond and a Pi molecular bond is that a Pi bond is the result of an overlapping of orbitals that come into contact with each other through the area that is overlapping. However, a Pi molecular bond is identified as the nodal plane which is existing between two atom...
by Armen_Isayan_3F
Sun Nov 29, 2020 10:30 pm
Forum: Ionic & Covalent Bonds
Topic: Lewis structure
Replies: 10
Views: 28

Re: Lewis structure

Hello! The method which I typically utilize to determine if the bonds distanced between the atoms in the molecule or covalent or ionic, is by determining the space found between the atoms on the actual periodic table. For instance, for the atoms which are close, they are usually ioninc bonds, howeve...
by Armen_Isayan_3F
Sun Nov 29, 2020 10:26 pm
Forum: Properties of Electrons
Topic: degenerate orbital
Replies: 5
Views: 16

Re: degenerate orbital

Hello! Degenrate orbital are known as electron orbital which express the same energy levels, however, according to Hund's rule the orbital must be filled evenly before the elctrons are transferred to higher energy levels.
by Armen_Isayan_3F
Sun Nov 22, 2020 10:01 pm
Forum: Trends in The Periodic Table
Topic: Trend for effective nuclear charge
Replies: 3
Views: 11

Re: Trend for effective nuclear charge

Hello! The trend for effective nuclear charge on a periodic table is that it increases from left to right of the table, however, it decreases down a group.
by Armen_Isayan_3F
Sun Nov 22, 2020 9:59 pm
Forum: Trends in The Periodic Table
Topic: Ionic Character
Replies: 11
Views: 37

Re: Ionic Character

Hello! In order to determine ionic and covalent character you must assess the difference between electronegativity, this is because if there is a large difference in electronegativity, it is likely the bon will be ionic. However, the less difference there is in electronegativity the more likely it w...
by Armen_Isayan_3F
Sun Nov 22, 2020 9:55 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity
Replies: 7
Views: 31

Re: Electron Affinity

Hello! If it is in the same row and right next to each other, the atom on the right would have the higher electron affinity, this is because electron affinity gradually increase as you move from the left to the right of the periodic table.
by Armen_Isayan_3F
Sun Nov 22, 2020 9:53 pm
Forum: Trends in The Periodic Table
Topic: Identifying Elements
Replies: 8
Views: 46

Re: Identifying Elements

Hello! This is because those elements which share similar chemical properties are naturally grouped together, it makes it easier to find and analyze these elements.
by Armen_Isayan_3F
Sun Nov 22, 2020 9:52 pm
Forum: Trends in The Periodic Table
Topic: Metallic Character
Replies: 7
Views: 46

Re: Metallic Character

This is because the metallic character is greatest in the lowest left corner of the periodic table because it is easier for the elements in the lowest left corner of the periodic table to lose atoms.
by Armen_Isayan_3F
Sun Nov 15, 2020 3:55 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 9
Views: 36

Re: Electronegativity

Hello! Atoms are more electronegative going from the left to the right of the periodic table because the number of charges within the nucleus increase, hence increasing the electronegativity. In essence, as the electronegativity increases, the atoms are able to bond with electrons more easily. Also,...
by Armen_Isayan_3F
Sun Nov 15, 2020 3:51 pm
Forum: Resonance Structures
Topic: lewis base or acid
Replies: 15
Views: 52

Re: lewis base or acid

Hello! A Lewis acid is the substance which accepts electrons, an electron-pair acceptor. Whereas the Lewis base donates electrons, an electron-pair donor.
by Armen_Isayan_3F
Sun Nov 15, 2020 3:47 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 11
Views: 63

Re: Resonance

Hello! In order to determine the most stable structure among various resonance structures, it is crucial to find the resonance structure with the least amount of charges. This will indicate how stable it is in reality. Also within the structure, the most electronegative atoms will have negative char...
by Armen_Isayan_3F
Sun Nov 15, 2020 3:35 pm
Forum: Ionic & Covalent Bonds
Topic: Electronegativity
Replies: 18
Views: 55

Re: Electronegativity

Hello, in order to calculate the electronegativity of an atom, we take the two elements from the chemical formula, and we subtract the smaller electronegativity from the larger electronegativity to determine the type of bond. It is important to remember that as you move up and to the right of the pe...
by Armen_Isayan_3F
Sun Nov 15, 2020 3:18 pm
Forum: Trends in The Periodic Table
Topic: Trends in Periodic Table Tips
Replies: 11
Views: 70

Re: Trends in Periodic Table Tips

To further understand the trends within the periodic table I would recommend writing down the trends you have a difficulty familiarizing yourself with on a flashcard and you can test yourself. Later you could apply the concepts you tested yourself on to the actual periodic table to see if the flashc...
by Armen_Isayan_3F
Sun Nov 15, 2020 3:14 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electrostatic Potential Energy
Replies: 3
Views: 13

Re: Electrostatic Potential Energy

Hello! Electrostatic potential energy is essentially the potential energy of a proton in regards to its positioning near a molecule. The more negative the electrostatic potential energy becomes, an attraction is formulated between the proton and molecules.
by Armen_Isayan_3F
Sun Nov 15, 2020 3:09 pm
Forum: Quantum Numbers and The H-Atom
Topic: Effective nuclear charge
Replies: 4
Views: 18

Re: Effective nuclear charge

Hello! An effective nuclear charge is the net change, which is usually positive, that the outermost electron shell experiences. The effective nuclear charge tends to be a lower value than the actual nuclear charge.
by Armen_Isayan_3F
Sun Nov 08, 2020 9:00 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Isoelectric atoms
Replies: 9
Views: 37

Re: Isoelectric atoms

Hello! isoelectronic atoms are described as two atoms, ions, or molecules that contain the same electron configuration. They do indeed have the same number of electrons, but their properties are different, hence they will not have the same charge. Also the electronegativity is dependent upon how man...
by Armen_Isayan_3F
Sun Nov 08, 2020 8:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Parallel electrons
Replies: 7
Views: 47

Re: Parallel electrons

According to Hund, electrons in the ground state, which is the lowest energy electron configuration, would finally have electrons become parallel. Hence, each orbital of the sub shell is occupied with electrons of parallel spin.
by Armen_Isayan_3F
Sun Nov 08, 2020 8:47 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Cations and Anions
Replies: 4
Views: 15

Re: Cations and Anions

Hello! This is best understood through understanding the trend of electronegativity, which is an atoms likelihood to attract a shared pair of electrons. As you move from the left to the right end of the periodic table the, more electronegative the atoms are. In essence, cations are described as posi...
by Armen_Isayan_3F
Sun Nov 08, 2020 8:34 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: S vs P electrons
Replies: 5
Views: 37

Re: S vs P electrons

Hi, this is best explained by the orbitals distance from the nucleus. For instance, as the s orbital is closer to the nucleus than the p orbital is, the p orbital has electrons that are farther out from the nucleus which demonstrates that it is at a higher energy level. Hence, the shielding of the p...
by Armen_Isayan_3F
Sun Nov 08, 2020 8:18 pm
Forum: Properties of Electrons
Topic: Electron Spin
Replies: 7
Views: 60

Re: Electron Spin

Hello! The 'spin' is best described as a property of electrons and this term is utilized because electrons seem to contain an angular momentum that rotates the electron. It just seems that they are spinning, however, in reality the subatomic particles are just spinning in a very rapid motion.
by Armen_Isayan_3F
Sun Nov 08, 2020 11:45 am
Forum: Properties of Electrons
Topic: Elements with similar number of electrons
Replies: 9
Views: 37

Re: Elements with similar number of electrons

Hello! Elements with the same number of electrons contain the same properties as the number of electrons dictates the chemical behavior of the electrons.
by Armen_Isayan_3F
Sun Nov 01, 2020 5:23 pm
Forum: Properties of Electrons
Topic: How to find number of electrons
Replies: 8
Views: 77

Re: How to find number of electrons

To find the maximum number of electrons that can be ejected from metal when given a total energy you would have to first find the energy per photon, and then divide that by the total energy.
by Armen_Isayan_3F
Sun Nov 01, 2020 4:43 pm
Forum: Significant Figures
Topic: Rouding Range
Replies: 7
Views: 45

Re: Rouding Range

The rounding range is usually contingent on how many sig figs you should be using to answer the problem.
by Armen_Isayan_3F
Sun Nov 01, 2020 4:22 pm
Forum: Trends in The Periodic Table
Topic: Oxygen and Ionization Energy
Replies: 9
Views: 39

Re: Oxygen and Ionization Energy

I believe this is due to the fact that Oxygen has lower ionisation energy than nitrogen as a result of an electron being added to a half full orbital in the Oxygen. This makes Oxygen one of the few outliers that don't follow the ionization energy trend in the periodic table.
by Armen_Isayan_3F
Sun Nov 01, 2020 3:59 pm
Forum: Properties of Light
Topic: How to remember what v is in equations
Replies: 46
Views: 140

Re: How to remember what v is in equations

Use a regular v for velocity. As for the frequency v, I just add a small tail in the beginning and that should help you differentiate between your frequency and velocity v's.
by Armen_Isayan_3F
Sun Nov 01, 2020 3:37 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity vs Electronegativity
Replies: 7
Views: 44

Re: Electron Affinity vs Electronegativity

Although electron affinity and electronegativity share some similar aspects, they are not the same. Electron affinity is a measure of the change in energy when a neutral atom attracts an electron to become a negative ion, while Electronegativity refers to the ability an atom has to attract electrons...
by Armen_Isayan_3F
Sun Oct 25, 2020 11:17 pm
Forum: DeBroglie Equation
Topic: Determining Energy of a Photon
Replies: 5
Views: 45

Re: Determining Energy of a Photon

Hi, it is important to understand what the questions is asking to fully solve the problem. In this instance, since the question mentioned using the De Broglie equation to solve the problem, 2.5 micrometers is indeed supposed to be the wavelength.
by Armen_Isayan_3F
Sun Oct 25, 2020 11:10 pm
Forum: SI Units, Unit Conversions
Topic: nanometer conversion
Replies: 5
Views: 24

Re: nanometer conversion

In order to convert from meters to nanometers you would have to multiply the figure that has been presented by 1,000,000,000 (10^9).
by Armen_Isayan_3F
Sun Oct 25, 2020 11:01 pm
Forum: Photoelectric Effect
Topic: Mass of atoms
Replies: 18
Views: 95

Re: Mass of atoms

Hello Katie, the mass of the atoms should be presented in kilograms because it is the SI unit for mass. Unless, an actual unit is specified it is best to utilize kilograms as the unit for the mass.
by Armen_Isayan_3F
Sun Oct 25, 2020 10:58 pm
Forum: Photoelectric Effect
Topic: Frequency and energy
Replies: 15
Views: 74

Re: Frequency and energy

Yes, there is a positive correlation, this is because the energy equation, E = hν displays that as the frequency increases energy does as well.
by Armen_Isayan_3F
Sun Oct 25, 2020 10:30 pm
Forum: Trends in The Periodic Table
Topic: Electron Affinity and Electronegativity
Replies: 9
Views: 63

Re: Electron Affinity and Electronegativity

Hello Michael! The difference between electronegativity and electron affinity is that electronegativity defines how likely an atom is to attract a shared pair of electrons. On the other hand, electron affinity is the change which occurs in energy when an electron is added to a gaseous atom.
by Armen_Isayan_3F
Sun Oct 18, 2020 5:09 pm
Forum: Properties of Light
Topic: Conversion Factor - m to nm
Replies: 6
Views: 37

Re: Conversion Factor - m to nm

In order to convert meters to nanometers all you have to do is multiply the figure you are trying too convert by 1000000000.
by Armen_Isayan_3F
Sun Oct 18, 2020 5:07 pm
Forum: Properties of Electrons
Topic: Energy Levels
Replies: 4
Views: 33

Re: Energy Levels

YEs, electrons have the ability to skip energy levels. An electron does not only exist at certain energy levels, but rather they transition from one energy level to a higher energy level through excitement, and they can smoothly skip levels.
by Armen_Isayan_3F
Sun Oct 18, 2020 4:58 pm
Forum: Properties of Electrons
Topic: Electrons ejected
Replies: 7
Views: 39

Re: Electrons ejected

Yes, increasing the light intensity would determine that the number of electrons that are ejected would be heightened.
by Armen_Isayan_3F
Sun Oct 18, 2020 4:54 pm
Forum: Properties of Electrons
Topic: Electron Transition
Replies: 7
Views: 34

Re: Electron Transition

Electron transition is the excitement of electrons as they move from one energy level to the higher energy level. There is a evident energy change in the electron transition.
by Armen_Isayan_3F
Sun Oct 18, 2020 4:42 pm
Forum: Properties of Electrons
Topic: Movement from energy level to energy level
Replies: 4
Views: 39

Re: Movement from energy level to energy level

When an electron is excited it jumps from energy level to energy level through an energy gain, which could be an increase in the heat which stimulates the excitement or it could have just collided with another electron.
by Armen_Isayan_3F
Sun Oct 18, 2020 4:33 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Strength
Replies: 4
Views: 145

Re: Strength

Relative anion stability is described by the orbital in which the electrons are found in, depending on how much energy that orbital contains, if the orbital contains less energy the more stable the anion will be.
by Armen_Isayan_3F
Sun Oct 18, 2020 4:30 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Stronger acid?
Replies: 13
Views: 595

Re: Stronger acid?

HC1O2 is definitely stronger than HC1O because when the electronegativity of the central atom decreases this in turn weakens the O-H bond, and most importantly to answer your question the acidity will increase when the bond is weakened.
by Armen_Isayan_3F
Sun Oct 18, 2020 4:23 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Acidosis
Replies: 3
Views: 128

Re: Acidosis

Carbon dioxide (CO2) leads to respiratory acidosis because the lungs are unable to remove the CO2 that is produced by the body. The extra CO2 that is found in the body causes the pH of the blood to decrease, and the body is no longer able to control the acidity properly.
by Armen_Isayan_3F
Sun Oct 18, 2020 4:16 pm
Forum: Trends in The Periodic Table
Topic: Nitrogen
Replies: 7
Views: 161

Re: Nitrogen

Nitrogen disrupts the electron affinity trend because the effective nuclear charge increases, every single p-orbital is occupied by one electron, as the incoming electron is identical to the electron that is already occupied, more energy is needed to add it.
by Armen_Isayan_3F
Sun Oct 11, 2020 11:34 am
Forum: Balancing Chemical Reactions
Topic: Types of Chemical Reactions
Replies: 8
Views: 84

Re: Types of Chemical Reactions

Hello! I believe that the fundamentals are our responsibility to review and understand as it is mostly high school material, however, moving forward on to more advanced topics we will most likely have more in-depth reviews as it is newly introduced.
by Armen_Isayan_3F
Sun Oct 11, 2020 11:28 am
Forum: Balancing Chemical Reactions
Topic: Molar Mass
Replies: 23
Views: 137

Re: Molar Mass

Hello! When a question requires us to calculate anything that needs molar mass, I personally use the precise numbers on the periodic table and then round to the number of sig figs necessary. As others have mentioned the number of sig figs which are usually utilized is 4 or 5, which is a solid amount...
by Armen_Isayan_3F
Sun Oct 11, 2020 11:16 am
Forum: Balancing Chemical Reactions
Topic: Balancing equations.
Replies: 35
Views: 682

Re: Balancing equations.

Hello, when it comes to balancing equations there exists much simpler and larger equations. In regards to the simpler equations, all you have to do is come to a conclusion of how many atoms are on each side and add coefficients to the molecules on each side of the equation until the number of atoms ...
by Armen_Isayan_3F
Sun Oct 11, 2020 11:08 am
Forum: Balancing Chemical Reactions
Topic: Naming compounds
Replies: 21
Views: 152

Re: Naming compounds

Hello! I believe that the names of compounds will be provided on the exam, however, it would still be beneficial to learn naming basic compounds. There are basic tactics which you can familiarize yourself with that may help in the long run in naming compounds. For instance, when you are naming an io...
by Armen_Isayan_3F
Sun Oct 11, 2020 11:01 am
Forum: Balancing Chemical Reactions
Topic: Periodic Table
Replies: 50
Views: 410

Re: Periodic Table

Hello! The periodic table should be provided during exams, however, it would be beneficial to learn the different patterns that are present on the periodic table. In turn this will conserve time spent trying to analyze the table for particular questions that you may come across during an exam. Some ...

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