Search found 55 matches

by DTingey_1C
Sat Dec 07, 2019 7:35 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: Test 2, Question 7A
Replies: 3
Views: 129

Re: Test 2, Question 7A

Ryan Chew 1C wrote:Yes, you are correct. Each O atom counts as two H bonding sites due to the two lone electron pairs.


Ok but when I counted each O as two bonding sites, then added the H and N bonding sites both as one bonding site each, I got 12 instead of the answer, 11.
by DTingey_1C
Sat Dec 07, 2019 7:10 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: hydrogen bonding
Replies: 3
Views: 88

Re: hydrogen bonding

Hydrogen bonding can occur between molecules of the same substance, or with molecules of other substances, just as long as the H atoms are bonding with N, O, or F atoms.
by DTingey_1C
Sat Dec 07, 2019 7:07 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: Test 2, Question 7A
Replies: 3
Views: 129

Test 2, Question 7A

On Test 2, question 7A asks to give the total number of bonding sites for Xanthin. Is one hydrogen bonding site normally one N, O, or F with a lone pair, or one H atom? Because I counted these on the Xanthin molecule and get 9, but my TA wrote 11 as the correct answer. I don't know, is it possible f...
by DTingey_1C
Fri Dec 06, 2019 3:44 pm
Forum: Lewis Acids & Bases
Topic: Hw 6.5
Replies: 4
Views: 49

Re: Hw 6.5

Yes isn't SO3 with one double bond more unstable than SO3 with 3 double bonds? Maybe this is because it wouldn't act as a lewis acid anymore.
by DTingey_1C
Thu Dec 05, 2019 1:01 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Acid/Base Trends
Replies: 6
Views: 88

Acid/Base Trends

If the strength of binary acids increases with elements across a period because of the increase in electronegativity, why does the strength of binary acids also increase with elements down a group if electronegativity typically decreases down a group? Thanks
by DTingey_1C
Wed Dec 04, 2019 7:09 pm
Forum: Bond Lengths & Energies
Topic: 2D. 19
Replies: 3
Views: 101

Re: 2D. 19

You basically just find the radius of each atom that is bonded together in the table and you add them together. The sum of the covalent radii is the bond length. We will probably never see this on any test because it is a weird question since you need a table to calculate the values.
by DTingey_1C
Wed Dec 04, 2019 7:02 pm
Forum: Bond Lengths & Energies
Topic: conjugation
Replies: 3
Views: 108

Re: conjugation

Additionally, the more double bonds, the stronger the bonds are on the molecule overall. So a tetrahedral with three double bonds will have stronger bonds than an identical tetrahedral with only one double bond.
by DTingey_1C
Wed Dec 04, 2019 6:56 pm
Forum: Hybridization
Topic: 2.45 Hybridization
Replies: 3
Views: 56

Re: 2.45 Hybridization

If it makes it easier to understand, think of the hybridization as something akin to the shape of the molecule. sp3 means there are 4 regions of e- density, meaning the shape can be AX4, AX3E, AX2E2, ect. This means that you can almost name a molecule as a tetrahedral by knowing that its hybridizati...
by DTingey_1C
Mon Nov 25, 2019 3:55 pm
Forum: Bronsted Acids & Bases
Topic: Weak vs Strong Acid/Bases
Replies: 3
Views: 38

Weak vs Strong Acid/Bases

The book defines a weak/base acid as a compound that only deprotonates/protonates a small fraction of molecules in a solution. But, are there examples of acids or bases that deprotonate/protonate a larger percentage, but not necessarily 100% of molecules in a solution. Can a base that only deprotona...
by DTingey_1C
Mon Nov 25, 2019 2:52 pm
Forum: Bronsted Acids & Bases
Topic: Basic and Acidic Compounds
Replies: 1
Views: 34

Basic and Acidic Compounds

I don't understand what makes something basic or acidic. Are bronsted bases very basic on their own? Or are they only basic when they have water and acids to interact with? Thanks.
by DTingey_1C
Mon Nov 25, 2019 1:48 pm
Forum: Bronsted Acids & Bases
Topic: Memorizing the Bronsted Acids and Bases
Replies: 4
Views: 54

Memorizing the Bronsted Acids and Bases

Is it necessary to memorize all of the Bronsted acids and bases that have 100% deprotonation/protonation and their molecular formulas? Thanks.
by DTingey_1C
Mon Nov 25, 2019 1:45 pm
Forum: Bronsted Acids & Bases
Topic: Question About J.9 A
Replies: 1
Views: 31

Question About J.9 A

In question J.9 A, you are asked to identify the salt formed from acid-base neutralization reactions. In A, potassium hydroxide and acetic acid are used. But, in the answers, it formats the potassium separate from the acetic acid and separated in salt form, like this: CH3COOH + K+ + OH- ---> K+ + CH...
by DTingey_1C
Mon Nov 25, 2019 1:34 pm
Forum: Bronsted Acids & Bases
Topic: Ions and Bronsted Acids and Bases
Replies: 1
Views: 25

Ions and Bronsted Acids and Bases

Is it important that we memorize all of the charges for the ions (such as nitrate, nitrite, phosphate, ect)? Or will we be given the charges on the test? Thanks.
by DTingey_1C
Mon Nov 25, 2019 1:20 pm
Forum: Bronsted Acids & Bases
Topic: Why do acids and bases react?
Replies: 3
Views: 41

Why do acids and bases react?

In an acid-base reaction, such as:

HBr = K+(OH)- --> KBr + H2O

What is forcing the H atom in the HBr to switch with the K atom in the K+(OH)-? Is switch the wrong word to use? Is there a better way to understand this reaction conceptually? Thanks.
by DTingey_1C
Mon Nov 25, 2019 1:11 pm
Forum: Bronsted Acids & Bases
Topic: Difference between Bronsted Acids and Bases
Replies: 1
Views: 28

Difference between Bronsted Acids and Bases

In problem J.1, you are asked to identify bronsted acids and bases. It says NH3 is a base and H2SO3 is an acid. How can you tell the difference? Is it because NH3 has a lone pair that allows it to receive H+ ions? Or is it because it has 3 H atoms and usually molecules with more than 2 H atoms are b...
by DTingey_1C
Sun Nov 17, 2019 9:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Radicals
Replies: 2
Views: 30

Radicals

Do single e- in radicals repel atoms and other e- weaker than lone pairs do?
by DTingey_1C
Sun Nov 17, 2019 8:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape of H20
Replies: 3
Views: 40

Molecular Shape of H20

H20 has a angular, bent shape to it, which is why its polar. But, why don't its lone pairs repel each other and give it a linear shape (where the lone pairs are 180 degrees from each other and the H atoms are 180 degrees from each other)? Like this: ___LP H-- O --H ___LP LP = lone pair O and H = ato...
by DTingey_1C
Sun Nov 17, 2019 8:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shapes
Replies: 6
Views: 49

Molecular Shapes

The book contains all of the different molecular shape names (linear, see-saw, T-shape, ect). Do we have to memorize all of these?
by DTingey_1C
Sun Nov 17, 2019 6:58 pm
Forum: Photoelectric Effect
Topic: Evidence of Waves Having Properties of Matter
Replies: 1
Views: 100

Evidence of Waves Having Properties of Matter

I understand the photoelectric effect proves that waves have properties that make them similar to matter, but is there an experiment that proves that matter has properties similar to waves as well?
by DTingey_1C
Sun Nov 17, 2019 6:51 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Other Atoms
Replies: 1
Views: 117

Other Atoms

I understand that we need to know how to calculate the energy of an e- in a particular energy level of a H atom, but would we ever need to apply a different equation for a different atom on a test? How do the multiple e- effect the equation?
by DTingey_1C
Sun Nov 17, 2019 6:49 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Lines on Atomic Absorption Spectroscopy
Replies: 1
Views: 110

Lines on Atomic Absorption Spectroscopy

What do the lines represent? Do each of the lines represent a particular wavelength of light that causes an e- to be ejected or is it the space between the lines that ejects an e-?
by DTingey_1C
Sun Nov 17, 2019 6:46 pm
Forum: DeBroglie Equation
Topic: Slow Moving Large Objects
Replies: 2
Views: 97

Slow Moving Large Objects

If a large object was moving so slow that it had an extremely small momentum despite its mass, could it theoretically have a measurable wavelength?
by DTingey_1C
Sun Nov 17, 2019 6:45 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers for H-Atom and other atoms
Replies: 1
Views: 87

Quantum Numbers for H-Atom and other atoms

What is the difference between the energy of an e- in H-atom orbitals and the orbitals in an atoms with multiple e-?
by DTingey_1C
Sun Nov 17, 2019 6:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Influence of Lone Pair e- on Model
Replies: 5
Views: 69

Influence of Lone Pair e- on Model

I know that Lavelle said that lone pair e- impact the shape of the molecule, but is the impact of a greater or lesser magnitude than if an atom were in the place of the lone pair? I hope this isn't too confusing.
by DTingey_1C
Sun Nov 17, 2019 6:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Angles
Replies: 4
Views: 40

VSEPR Angles

Is it necessary that we know the exact angles created by each of the different molecular shapes?
by DTingey_1C
Sun Nov 17, 2019 6:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 5
Views: 57

Re: VSEPR

He explained in class that we do not need to know the exact angles in the model, but we should know how the radii of atoms and other factors might impact the angles. Hope this helps.
by DTingey_1C
Mon Oct 28, 2019 8:20 pm
Forum: Ionic & Covalent Bonds
Topic: Homework 2A23 Help
Replies: 2
Views: 35

Homework 2A23 Help

How do you do B for this problem:

On the basis of the expected charges of the monatomic ions, give the chemical formula of each of the following compounds:

B: Indium (III) sufide
by DTingey_1C
Mon Oct 28, 2019 8:08 pm
Forum: Ionic & Covalent Bonds
Topic: e- configuration of Pd and Ni
Replies: 2
Views: 11

Re: e- configuration of Pd and Ni

And why is copper: [Ar] 3d10 4s1 instead of [Ar] 3d9 4s2?
by DTingey_1C
Mon Oct 28, 2019 8:04 pm
Forum: Ionic & Covalent Bonds
Topic: e- configuration of Pd and Ni
Replies: 2
Views: 11

e- configuration of Pd and Ni

Why is the e- configuration of Ni: [Ar] 3d8 4s2 while Pd is: [Kr] 4d10? Why isn't Ni [Ar] 3d10 like Pd is?
by DTingey_1C
Mon Oct 28, 2019 7:52 pm
Forum: Ionic & Covalent Bonds
Topic: Homework 2A15
Replies: 3
Views: 47

Homework 2A15

Why does is Ga, in problem D, form ions with a +3 charge? Why not -5 so it becomes stable?
by DTingey_1C
Sun Oct 27, 2019 8:17 pm
Forum: Ionic & Covalent Bonds
Topic: HW 2A.21d
Replies: 5
Views: 66

Re: HW 2A.21d

I believe Lavelle mentioned this odd configuration along with one other one that I am forgetting right now. He said that these two configurations are anomalies that we just have to memorize without much further explanation. Some areas of chemistry (and science in general) are proven experimentally b...
by DTingey_1C
Sun Oct 27, 2019 8:14 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent Bonds and Electrons
Replies: 3
Views: 31

Ionic and Covalent Bonds and Electrons

When ionic or covalent bonds are formed, does the "probability area" of an atom's e- shift toward the atom it is sharing e- with (or giving e- to)? If so, how is it effected by the bond?
by DTingey_1C
Sun Oct 27, 2019 8:09 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 14
Views: 152

Covalent Bonds

Are covalent bonds only formed by two non-metals? Or can other types of elements be involved and its just more unlikely?
by DTingey_1C
Sun Oct 27, 2019 8:07 pm
Forum: Lewis Structures
Topic: 2 Odd Configurations
Replies: 4
Views: 40

2 Odd Configurations

Lavelle mentioned 2 odd e- configurations in lecture that don't follow the normal rules of e- configuration. Is it necessary for us to memorize these configurations for the test or will they never show up?
by DTingey_1C
Sun Oct 27, 2019 8:05 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 3
Views: 35

Re: Drawing Lewis Structures

First count the e- in all the atoms and add them together then add the charge of the molecule. When drawing the placement of the atoms, put the one with the lowest ionization energy in the middle and the other atoms around it (hydrogen is always on the outside. Then draw the e- around the atoms (onl...
by DTingey_1C
Sun Oct 20, 2019 7:18 pm
Forum: DeBroglie Equation
Topic: EM Radiation and DeBroglie Equation
Replies: 3
Views: 44

Re: EM Radiation and DeBroglie Equation

Thanks for the article that's really interesting
by DTingey_1C
Sun Oct 20, 2019 7:16 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy Equation Confusion
Replies: 2
Views: 71

Heisenberg Indeterminacy Equation Confusion

I don't fully understand what the equation means conceptually. I understand that the equation represent the range of momentum and location of an electron, but what does this mean? Since the location is represented by "x," does this mean it is a distance? Or is more of an area of probabilit...
by DTingey_1C
Sun Oct 20, 2019 7:07 pm
Forum: DeBroglie Equation
Topic: EM Radiation and DeBroglie Equation
Replies: 3
Views: 44

EM Radiation and DeBroglie Equation

Since the DeBroglie equation requires a momentum to work, how does EM radiation have a wavelength? I thought light was massless, so how would it have a momentum that could be plugged into the equation?
by DTingey_1C
Sun Oct 20, 2019 7:05 pm
Forum: DeBroglie Equation
Topic: When to use DeBrogile's Equation
Replies: 4
Views: 78

Re: When to use DeBrogile's Equation

Also protons do have a mass, so they could be theoretically applied to the equation.
by DTingey_1C
Sun Oct 20, 2019 7:04 pm
Forum: DeBroglie Equation
Topic: When to use DeBrogile's Equation
Replies: 4
Views: 78

Re: When to use DeBrogile's Equation

The equation is only practically used for objects that have an observable wavelength. Since objects like cars have a velocity and mass, and therefore momentum, they have a wavelength when plugged into the equation. But, since the mass of the car is too great, the momentum is too high and the wavelen...
by DTingey_1C
Sun Oct 20, 2019 6:59 pm
Forum: DeBroglie Equation
Topic: Particle-wave duality
Replies: 2
Views: 51

Re: Particle-wave duality

The are not related because the E's (energies) are different forms of energy. In E=hv, E represents energy per photon, which is unrelated to mass. Whereas in E=mc^2, E represents units of energy (not per photon) and is directly proportional to mass. So, there isn't a relationship and hv can not equa...
by DTingey_1C
Wed Oct 16, 2019 2:16 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Problem from Audio Visual Focus Topic
Replies: 1
Views: 41

Problem from Audio Visual Focus Topic

How do you solve this problem, I keep getting non-whole numbers but the answer is n=6 :/.

An excited hydrogen atom emits light with a frequency of 1.14 x 1014 Hz to reach the energy level n = 4. In what principle quantum level did the electron begin?

Thank you
by DTingey_1C
Sun Oct 13, 2019 10:23 pm
Forum: Photoelectric Effect
Topic: Confusion on equations
Replies: 9
Views: 180

Re: Confusion on equations

E=hv lambda*v=c E=h*(c/lambda) lambda=(hc/E) Ultimately, you use equations to find unknown variables. So, if you know what the variables represent, and you understand how to find the variables out of the problem by manipulating other equations, you'll be fine. Here is what the variables mean: E = En...
by DTingey_1C
Sun Oct 13, 2019 10:14 pm
Forum: Photoelectric Effect
Topic: Electrons and High Intensity Light
Replies: 2
Views: 41

Re: Electrons and High Intensity Light

Metal needs a certain energy of light in order to remove electrons from its surface. The higher the frequency, the higher the energy. The energy of the light has to exceed a threshold energy needed to remove electrons from the surface of the metal. Once the threshold is exceeded, one electron will b...
by DTingey_1C
Sun Oct 13, 2019 10:04 pm
Forum: Properties of Electrons
Topic: Photons and Electrons
Replies: 2
Views: 27

Re: Photons and Electrons

Yes it is a one-to-one reaction. Increasing the intensity of a wave increases the electron interaction because the amount of photons is increased.
by DTingey_1C
Sun Oct 13, 2019 9:56 pm
Forum: Properties of Light
Topic: photoelectric effect
Replies: 3
Views: 48

Re: photoelectric effect

D. λv = c is the correct answer because it doesn't have to do with the photoelectric effect equation or any of its derivations. The equation shows the relationship between a wave's frequency and wavelength.
by DTingey_1C
Sun Oct 13, 2019 9:13 pm
Forum: Properties of Light
Topic: Frequency, Wavelength, Amplitude, and Velocity
Replies: 4
Views: 61

Re: Frequency, Wavelength, Amplitude, and Velocity

Frequency is the amount of cycles per second while wavelength is the length of the wave. So, they have an inverted relationship. Amplitude is the height of the wave, so it is unrelated to frequency or wavelength. Velocity is the speed of a particle in m/s.
by DTingey_1C
Sun Oct 06, 2019 8:45 pm
Forum: SI Units, Unit Conversions
Topic: Unit Conversions
Replies: 6
Views: 122

Unit Conversions

Do we need to memorize all of the different prefixes(giga, kilo, nano, ect.)? Or will it be given to us on a test? If so do u have any easy ways to memorize them? Thanks.
by DTingey_1C
Sun Oct 06, 2019 2:57 pm
Forum: Significant Figures
Topic: No numbers in problem?
Replies: 3
Views: 88

Re: No numbers in problem?

This was pretty much answered but I'd like to add that if a constant is used (like pi) you should use at least 3-4 sig figs. So, it would be 3.142 for pi.
by DTingey_1C
Sun Oct 06, 2019 2:53 pm
Forum: Balancing Chemical Reactions
Topic: Importance of the State of Molecules
Replies: 6
Views: 240

Re: Importance of the State of Molecules

I don't know how the reaction is impacted, but my TA said that you should get in the habit of doing it because it'll be important in the future. So, I'm assuming that it's important to do on tests as well.
by DTingey_1C
Sun Oct 06, 2019 2:32 pm
Forum: Limiting Reactant Calculations
Topic: Finding the limiting reaction
Replies: 3
Views: 66

Re: Finding the limiting reaction

This is the way I do it: 1. First find the moles of each reactant by dividing the grams of the reactant by its molar mass. 2. Use the moles of each reactant to calculate how much product can be produced (it doesn't matter which product you chose as long as you keep it consistent for all of the react...
by DTingey_1C
Sun Oct 06, 2019 2:19 pm
Forum: SI Units, Unit Conversions
Topic: Conversions
Replies: 2
Views: 41

Re: Conversions

One easy way to do conversions that I learned in high school is to think of the prefixes in a line, so like this: Kilo, hecto, deca, base unit, deci, centi, mili, micro... ect And think of these in terms of their respective numbers like this: 10^3, 10^2, 10^1, 10^0, 10^-1, 10^-2, 10^-3, 10^-6 And, w...
by DTingey_1C
Sun Oct 06, 2019 2:10 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Homework E19
Replies: 1
Views: 65

Homework E19

Here is the problem E19 from the textbook: A report stated that the Sudbury Neutrino Observatory in Sudbury, Canada, uses 1.00×10^3 tonne (1t=10^3kg)of heavy water, D2O, in a spherical tank of diameter 12 m to detect neutrinos. The density of normal water (H2O) at the temperature of the tank is 1.00...
by DTingey_1C
Sun Oct 06, 2019 2:04 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test Equation Sheet
Replies: 8
Views: 99

Re: Test Equation Sheet

Yes, Lavelle said that there will be all of the constants and basic equations we go over.

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