CHEMISTRY COMMUNITY

Heba Mengesha 3D

Yes, all polydentate ligands are chelating agents.

Heba Mengesha 3D

I believe because electrons of the same spin cancel each other out, the one unpaired electron in the atom will determine the spin.

Heba Mengesha 3D

Acids and bases that are completely ionized when dissolved in water are called strong acids and bases.

Heba Mengesha 3D

Since the formal charge can be negative or positive, the lower the formal charge, the higher the stability.

Heba Mengesha 3D

The boiling point of a molecule depends on its structure. It can depend on the intermolecular forces present between the atoms or molecules and boiling points increase as the size of the molecule increases.

Heba Mengesha 3D

A Bronsted base is a proton acceptor, while a Lewis acid is an electron acceptor. One way to tell the difference is to count the number of hydrogen ions. If the number of hydrogens has decreased that substance is the acid (donates hydrogen ions). If the number of hydrogens has increased that substan...

Heba Mengesha 3D

An amphoteric substance is one which can both donate hydrogen ions (protons) and also accept them.

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Acids are named based on their anion; the ion attached to the hydrogen. Most strong bases contain hydroxide, a polyatomic ion for example: NaOH is sodium hydroxide and KOH is potassium hydroxide.

Heba Mengesha 3D

Some strong acids include: Hydrochloric acid, Nitric Acid, and sulfuric acids. And some weak acids include: Carbonic Acid, and Vinegar. A strong base is a base that is 100% ionized in solution. If it is less than 100% ionized in solution, it is a weak base.

Heba Mengesha 3D

I believe that the pH scale is not limited to 0-14, but most common solutions fall into this range.

Heba Mengesha 3D

Electron geometry describes the arrangement of electron groups. Molecular geometry describes the arrangement of atoms, excluding lone pairs.

Heba Mengesha 3D

The central atom is determined by knowing the least electronegative atom which in this case would be Nitrogen. N2O has 2 pi bonds and 2 sigma bonds.

Heba Mengesha 3D

When considering melting points a larger atom with more electrons → higher polarizability → stronger intermolecular force → higher boiling/melting point. Therefore, CHI3 is a larger atom compared to CHF3.

Heba Mengesha 3D

If a diatomic molecule consists of two atoms of the same element, the molecule has to be non polar like H-H or O-O

Heba Mengesha 3D

Resonance structures involve the movement of pi-bonded electrons or of lone-pair electrons that are adjacent to pi bonds. You can't shift the location of electrons in sigma bonds – if you show a sigma bond forming or breaking, you are showing a chemical reaction taking place. The positions of atoms ...

Heba Mengesha 3D

A hydrogen bond is a strong dipole dipole interaction. Ion-dipole > hydrogen bond

Heba Mengesha 3D

You would know when a bond angle is "slightly less than" because of the existence of the lone pairs surrounding the atom. The lone pairs have a stronger electron repulsion pushing the other atoms farther away. This would make the bond angle "slightly less than..."

Heba Mengesha 3D

A linear shape may or may not be polar depending on if the molecule is symmetrical or not.

Heba Mengesha 3D

The repulsion of the lone pairs will cause the bond angles to be slightly less than 90 and 120 degrees.

Heba Mengesha 3D

For molecules, the boiling point increases with molecular weight.

Heba Mengesha 3D

Usually the central atom will be the one that has the most unpaired valence electrons. The central atom is also usually the least electronegative.

Heba Mengesha 3D

I believe we do not need to know anything in the f-block for our midterm

Heba Mengesha 3D

You will most likely be given a table on bond lengths if we need it

Heba Mengesha 3D

The chance of finding an electron in that region

Heba Mengesha 3D

m is for the mass of the element and M is from molarity

Heba Mengesha 3D

Yes resonance structures can have different formal charges because you move the electrons and bonds around the atom resulting in different charges.

Heba Mengesha 3D

Yes our final is on Sunday December 8.

Heba Mengesha 3D

Smaller, more positive cations would pull electrons more strongly, so they have more polarizing power. On the other hand, polarizability is the ability to pull those electrons towards the anion.

Heba Mengesha 3D

In ionic bonds, charge and distance are the two factors that affect the strength of the bond. The more electrons transferred, the stronger the bond. The difference from the nucleus is also a factor. The closer the nuclei to the electrons of the other atom, the less energy levels of electrons that ar...

Heba Mengesha 3D

Electronegativity is an atom's ability to attract electrons, as in a covalent bond. Polarizability increases with decreasing element binding energy

Heba Mengesha 3D

covalent bonds form when electrons are shared between two nonmetals. Nonmetals can however form different types of bonds depending on their partner atoms.

Heba Mengesha 3D

The workshops and step up sessions are really helpful. Also I would watch the audio visuals for each topic and review your lecture notes.

Heba Mengesha 3D

Single bonds have fewer negatively charged electrons shared between two atoms than double or triple bonds, so they don't attract the positively charged nuclei of the atoms as strongly as bonds with more electrons.

Heba Mengesha 3D

Yes, use the formal charge equation to find the charge of each atom.

Heba Mengesha 3D

When you go on the Lavelle's website it states that the midterm location will be posted at a later date. Maybe this week we'll find out.

Heba Mengesha 3D

Covalent bonds are formed between two non-metals, whereas ionic bonds are formed between a metal and non-metal.

Heba Mengesha 3D

Dipole moments occur when there is a separation of charge and arise from differences in electronegativity. The larger the difference in electronegativity, the larger the dipole moment.

Heba Mengesha 3D

Definitely do as MANY homework problems as you can. They help solidify the material we learn in lecture!

Heba Mengesha 3D

s-orbital electrons are closer to the nucleus (more stable) and farther from the nucleus (less stable) compared to the corresponding d-orbitals. This makes them favorable to occupy when no d-electrons are present, but less favorable to occupy when d-electrons are present, which is why they are fille...

Heba Mengesha 3D

X,Y,Z is just a label for each of the three orbital subsets.

Heba Mengesha 3D

Watching the learning modules along with Youtube videos which help me better understand how to apply the concepts discussed in Lectures. Also do plenty of practice problems from the textbook!

Heba Mengesha 3D

E represents the energy (in joules) of the particle of light.

Heba Mengesha 3D

Probability density is a "density" function. While probability is a specific value. The probability density function for a given value of X represents the density of probability.

Heba Mengesha 3D

Yes neutrons will create diffraction patterns if passed through a crystal because they have wave-like properties like electrons.

Heba Mengesha 3D

ΔpΔx≥h/4π is equal to ΔpΔx≥h/2

Heba Mengesha 3D

Yes. One method is to find and compare the mole ratio of the reactants used in the reaction to find the limiting reactant (reagent).

Heba Mengesha 3D

Test 1 only consists of review of High School Chemistry: Review of Chemical and Physical Principles.

Heba Mengesha 3D

In chemistry you should leave in powers of 10 for efficiency.

Heba Mengesha 3D

A molar ratio is used to identify the number of moles a product that are produced from a reactant as well as to figure out how many moles are required to react with the product.

Heba Mengesha 3D

Yes we will be provided with a periodic table along with all constants and equations.

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