Search found 52 matches

by zachary_nhem_4I
Sun Dec 01, 2019 10:50 pm
Forum: Hybridization
Topic: 2F.5
Replies: 4
Views: 17

Re: 2F.5

a) sp
b) sp^2
c) sp^3
d) sp^3
by zachary_nhem_4I
Sun Dec 01, 2019 10:42 pm
Forum: Naming
Topic: Brackets in Chem. Formula
Replies: 5
Views: 21

Re: Brackets in Chem. Formula

The contents within the bracket should be the "complex", which is a species consisting of a central metal atom or ion to which a number of molecule or ions are attached by coordinate covalent bonds.
by zachary_nhem_4I
Sun Dec 01, 2019 10:39 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Bond strength and strength of acid.
Replies: 6
Views: 19

Re: Bond strength and strength of acid.

The longer the bond/the weaker the bond, the stronger the acid will be.
by zachary_nhem_4I
Sun Dec 01, 2019 10:38 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs. Pi
Replies: 13
Views: 31

Re: Sigma vs. Pi

Sigma bonds are stronger because the two orbitals overlap, as opposed to a pi bond where the two orbitals are side by side.
by zachary_nhem_4I
Sun Dec 01, 2019 10:36 pm
Forum: Calculating the pH of Salt Solutions
Topic: Sig Figs for logarithmic funcitons
Replies: 4
Views: 25

Re: Sig Figs for logarithmic funcitons

I'm sure the number of sig figs would be the same as the concentration that is given
by zachary_nhem_4I
Sun Dec 01, 2019 10:30 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Acid strength relative to kA
Replies: 2
Views: 10

Re: Acid strength relative to kA

No, an acid with a lower pKa will have a greater Ka value because a stronger acid (high Ka value) would be more acidic (lower pKa/pH value). It would then make sense that for bases, the lower the Ka value the higher the pKa value.
by zachary_nhem_4I
Sun Dec 01, 2019 10:18 pm
Forum: Student Social/Study Group
Topic: Vocabulary
Replies: 2
Views: 15

Re: Vocabulary

I'm sure knowing the key words in the textbook would help (ligand, Bronsted-Lowry Theory, Deprotonated, Conjugate Acid, Conjugate Base, etc.)
by zachary_nhem_4I
Sun Nov 24, 2019 9:28 pm
Forum: Hybridization
Topic: strategy for hybridization
Replies: 2
Views: 13

Re: strategy for hybridization

I would just count the amount of bonds and from there write down the orbital that corresponds to it. For example, if there were three bonds, the hybridization would be sp^2 (there is one s orbital and 2 p for a total of 3)
by zachary_nhem_4I
Sun Nov 24, 2019 9:23 pm
Forum: Sigma & Pi Bonds
Topic: Electron density and pi bonds
Replies: 2
Views: 21

Re: Electron density and pi bonds

A sigma bond is cylindrically symmetric with no nodal planes and contains an internuclear axis, while a pi bond has a single nodal plane and contains the internuclear axis.
by zachary_nhem_4I
Sun Nov 24, 2019 9:19 pm
Forum: General Science Questions
Topic: Ligand question
Replies: 2
Views: 21

Re: Ligand question

A ligand is an ion or molecule attached to a metal atom by coordinate bonding.
by zachary_nhem_4I
Sun Nov 24, 2019 9:14 pm
Forum: Hybridization
Topic: hybridization
Replies: 4
Views: 17

Re: hybridization

Hybridization is the idea that atomic orbitals fuse to form newly hybridized orbitals, which in turn, influences molecular geometry and bonding properties.
by zachary_nhem_4I
Sun Nov 24, 2019 8:46 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand
Replies: 10
Views: 33

Re: Ligand

A ligand is an ion or molecule attached to a metal atom by coordinate bonding.
by zachary_nhem_4I
Sun Nov 24, 2019 8:37 pm
Forum: Hybridization
Topic: Counting for hybridization
Replies: 2
Views: 8

Re: Counting for hybridization

Yes, that's how our TA taught us to do it!
by zachary_nhem_4I
Sun Nov 24, 2019 8:36 pm
Forum: Lewis Acids & Bases
Topic: Lewis acids + bases and Bronsted acids + bases
Replies: 6
Views: 20

Re: Lewis acids + bases and Bronsted acids + bases

A Bronsted acid is a proton donor and a Bronsted base is a proton acceptor, while a Lewis base is an electron acceptor, while a Lewis base is an electron donor. (Bronsted refers to protons while Lewis refers to electrons)
by zachary_nhem_4I
Sun Nov 24, 2019 8:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Definiton
Replies: 1
Views: 10

Re: Definiton

A ligand is an ion or molecule attached to a metal atom by coordinate bonding.
by zachary_nhem_4I
Sun Nov 17, 2019 6:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Prediction of Angles
Replies: 4
Views: 21

Re: Prediction of Angles

Angles are based off of the amount of areas of high electron density, as well as whether these areas are bonds or lone pairs. There is a chart you can find on google images that specifies bond angles based off of VSEPR equations. And technically the names of the shape come from the VSEPR model, so y...
by zachary_nhem_4I
Sun Nov 17, 2019 6:05 pm
Forum: Dipole Moments
Topic: SCl4 Molecule
Replies: 5
Views: 18

Re: SCl4 Molecule

Because there is a lone pair that acts as an area of high electron density, thus, affecting the shape of and polarity of the molecule.
by zachary_nhem_4I
Sun Nov 17, 2019 6:03 pm
Forum: Lewis Structures
Topic: Noble gases
Replies: 3
Views: 35

Re: Noble gases

This occurs because some elements are able to have an expanded octet. This occurs when the valence shell has enough orbitals to accommodate for the additional electrons.
by zachary_nhem_4I
Sun Nov 17, 2019 6:00 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: dipole moments
Replies: 7
Views: 23

Re: dipole moments

yes, a dipole moment is a measurement of the separation of two opposite electrical charges.
by zachary_nhem_4I
Sun Nov 17, 2019 5:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: two central atoms
Replies: 3
Views: 14

Re: two central atoms

I'm pretty sure you just say that it has two different shapes (one for each central atom)
by zachary_nhem_4I
Sun Nov 17, 2019 5:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: repulsion strength
Replies: 5
Views: 19

Re: repulsion strength

The strengths of repulsions are in the order lone pair - lone pair > lone pair - atom > atom -atom
by zachary_nhem_4I
Sun Nov 10, 2019 7:56 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: polarizability
Replies: 2
Views: 17

Re: polarizability

An anion will be highly polarizable if its large, such as an iodine ion. A cation will have a high polarizing power if it is small and highly charged such as Al3+ (From the textbook).
by zachary_nhem_4I
Sun Nov 10, 2019 7:50 pm
Forum: Coordinate Covalent Bonds
Topic: coordinate covalent bond
Replies: 9
Views: 62

Re: coordinate covalent bond

CO, because the oxygen will give a lone pair of electrons to fulfill the octet of both atoms.
by zachary_nhem_4I
Sun Nov 10, 2019 7:47 pm
Forum: Resonance Structures
Topic: octet v. expanded octet
Replies: 5
Views: 31

Re: octet v. expanded octet

Although certain atoms can either have an octet or an expanded octet, I'm pretty sure they can only have one or the other at a given time.
by zachary_nhem_4I
Sun Nov 10, 2019 7:38 pm
Forum: Bond Lengths & Energies
Topic: Resonance Bond Lengths
Replies: 3
Views: 13

Re: Resonance Bond Lengths

Yes, the length would be a value in between (the average) the amount of double and single bonds within that particular bond.
by zachary_nhem_4I
Sun Nov 10, 2019 7:29 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 2
Views: 13

Re: Bond Angles

According to the VSPER theory, lone pair electrons will repel each other, therefore, pushing other atoms in specific angles.
by zachary_nhem_4I
Sun Nov 10, 2019 7:23 pm
Forum: Resonance Structures
Topic: Contribution of each structure?
Replies: 4
Views: 30

Re: Contribution of each structure?

Wouldn't you just look at formal charges?
by zachary_nhem_4I
Sun Nov 03, 2019 11:10 pm
Forum: *Shrodinger Equation
Topic: effective nuclear charge
Replies: 5
Views: 55

Re: effective nuclear charge

Effective nuclear charge is the net nuclear charge after taking into account the shielding caused by other electrons in the atom.
by zachary_nhem_4I
Sun Nov 03, 2019 10:55 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 4
Views: 37

Re: Quantum Numbers

There are some energy levels that don't have certain orbitals. For example, for part b, the f block (l=3) exists within the 6th energy level (n=6), as a result, n = 3, l = 3, ml = 1, ms = -1/2 does not exist.
by zachary_nhem_4I
Sun Nov 03, 2019 10:50 pm
Forum: Lewis Structures
Topic: Drawing lewis structures
Replies: 5
Views: 31

Re: Drawing lewis structures

Our TA said to try to draw lewis structures with as many bond with a formal charge of 0 (especially on the central element)
by zachary_nhem_4I
Sun Nov 03, 2019 10:44 pm
Forum: Administrative Questions and Class Announcements
Topic: study guide
Replies: 2
Views: 19

Re: study guide

I don't believe so. The textbook should cover everything though.
by zachary_nhem_4I
Sun Nov 03, 2019 10:40 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 18
Views: 73

Re: Resonance Structures

Resonance structures are a set of two or more Lewis Structures that collectively describe the electronic bonding a single polyatomic species including fractional bonds and fractional charges
by zachary_nhem_4I
Mon Oct 28, 2019 12:22 am
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7666
Views: 1036832

Re: Post All Chemistry Jokes Here

Q: What kind of fish is made out of 2 sodium atoms?
A: 2 Na
by zachary_nhem_4I
Mon Oct 28, 2019 12:19 am
Forum: Trends in The Periodic Table
Topic: Exact radii/ionization energies
Replies: 1
Views: 10

Re: Exact radii/ionization energies

I believe we just have to recognize trends, as opposed to memorizing actual numbers.
by zachary_nhem_4I
Mon Oct 28, 2019 12:16 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: HW question 1D.13
Replies: 1
Views: 5

Re: HW question 1D.13

a) 7 values (0,1,2,3,4,5,6)
b) 5 values (-2,-1,0,1,2)
c) 3 values (-1,0,1)
d) 4 subshells: 4s, 4p, 4d, 4f
by zachary_nhem_4I
Mon Oct 28, 2019 12:12 am
Forum: Sigma & Pi Bonds
Topic: Single vs. Double bonds
Replies: 15
Views: 76

Re: Single vs. Double bonds

More electrons leads to shorter bonds while less electrons means less of an attraction
by zachary_nhem_4I
Mon Oct 28, 2019 12:11 am
Forum: Ionic & Covalent Bonds
Topic: Anions and Cations
Replies: 4
Views: 30

Re: Anions and Cations

Anions refer to elements that gain electrons and cations are elements that lose electrons
by zachary_nhem_4I
Sun Oct 20, 2019 9:43 pm
Forum: Quantum Numbers and The H-Atom
Topic: Balmer and Lyman Series
Replies: 6
Views: 43

Re: Balmer and Lyman Series

The Lyman series involves an electron that jumps to or from the ground state (n=1), and the Balmer series involves an electron that jumps to or from the n=2 energy level. The Lyman series corresponds to ultraviolet rays while I believe the Balmer series corresponds to visible rays.
by zachary_nhem_4I
Sun Oct 20, 2019 9:38 pm
Forum: DeBroglie Equation
Topic: Unit Conversion
Replies: 5
Views: 36

Re: Unit Conversion

1 mHz = 1000000 Hz
by zachary_nhem_4I
Sun Oct 20, 2019 9:36 pm
Forum: General Science Questions
Topic: Quick clarification
Replies: 4
Views: 46

Re: Quick clarification

It's Planck's constant (h)
by zachary_nhem_4I
Sun Oct 20, 2019 9:33 pm
Forum: Properties of Light
Topic: light regions
Replies: 4
Views: 26

Re: light regions

My TA told us that we have to memorize it. I believe a wave that is 8.8 nm is in the x-ray region.
by zachary_nhem_4I
Sun Oct 20, 2019 9:26 pm
Forum: General Science Questions
Topic: Test #1
Replies: 6
Views: 44

Re: Test #1

The theoretical yield is always a percentage so multiplying by 100 will always be required.
by zachary_nhem_4I
Sun Oct 13, 2019 10:19 pm
Forum: *Black Body Radiation
Topic: What is the function of blackbodies?
Replies: 2
Views: 38

Re: What is the function of blackbodies?

A black body is a surface or object that absorbs all wavelengths of light/doesn't reflect any light. I believe Dr. Lavelle said that there aren't any objects with true blackbody characteristics, and therefore, we aren't going to learn much about them in this class.
by zachary_nhem_4I
Sun Oct 13, 2019 10:07 pm
Forum: Significant Figures
Topic: sig figs and periodic tables
Replies: 11
Views: 84

Re: sig figs and periodic tables

The IUPAC Periodic table is the one we used on the test and I believe it goes to three our four decimal places
by zachary_nhem_4I
Sun Oct 13, 2019 9:54 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D #11
Replies: 2
Views: 20

Re: 1D #11

a) 1
b) 5
c) 3
d) 7
by zachary_nhem_4I
Sun Oct 13, 2019 9:45 pm
Forum: Photoelectric Effect
Topic: Post Assessment Help
Replies: 2
Views: 19

Re: Post Assessment Help

Kinetic Energy = 1/2 mv^2
by zachary_nhem_4I
Sun Oct 13, 2019 9:36 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D #19
Replies: 2
Views: 22

Re: 1D #19

a) 3
b) 5
c) 1
d) 7
by zachary_nhem_4I
Sun Oct 06, 2019 8:23 pm
Forum: Balancing Chemical Reactions
Topic: H.19
Replies: 2
Views: 19

Re: H.19

2 C11H18N2O5 + 17 O2 22 CO2 + 18 H2 +2 N2
by zachary_nhem_4I
Sun Oct 06, 2019 7:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 1
Replies: 3
Views: 45

Re: Test 1

Our TA said that all of the problems are free response, as we are essential doing very similar problems as the ones given on our homework.
by zachary_nhem_4I
Fri Oct 04, 2019 11:32 am
Forum: Limiting Reactant Calculations
Topic: Study Strategies/Youtube Videos
Replies: 14
Views: 116

Re: Study Strategies/Youtube Videos

Besides Crash Course, Khan Academy, and Tyler DeWitt, Melissa Maribel does a good job at explaining both high school and college chemistry topics.
by zachary_nhem_4I
Fri Oct 04, 2019 11:25 am
Forum: Molarity, Solutions, Dilutions
Topic: Dilution Calculation
Replies: 5
Views: 26

Re: Dilution Calculation

If the question wants the final answer in milliliters, then there is no need to convert anything into liters. However, if the measurement is given in liters, the you would need to convert that into milliliters by using the conversion: 1 milliliter=0.001 liters.
by zachary_nhem_4I
Fri Oct 04, 2019 11:17 am
Forum: Empirical & Molecular Formulas
Topic: Order of elements in formulas
Replies: 5
Views: 45

Re: Order of elements in formulas

I'm not entirely sure, but I think it follows an order outlined by the Hill system. Essentially, an individual most list carbon atoms first, then hydrogen, and finally any other elements are arranged alphabetically.

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