Search found 36 matches

by Jillian C 4C
Sat Nov 09, 2019 1:14 pm
Forum: Dipole Moments
Topic: Interaction Potential Energy
Replies: 2
Views: 12

Re: Interaction Potential Energy

The variable a1 represents the charge of the first ion (cation) while a2 is the charge of the second ion (anion).
by Jillian C 4C
Sat Nov 09, 2019 1:06 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polar Covalent VS Ionic
Replies: 11
Views: 43

Re: Polar Covalent VS Ionic

Both the ionic and atomic radius trends decrease across a period and increase down a group due to the additions of energy levels. Across a period, the energy level stays the same and protons are being added, increasing the nuclear charge.
by Jillian C 4C
Sat Nov 09, 2019 1:01 pm
Forum: Bond Lengths & Energies
Topic: de Broglie threshold
Replies: 4
Views: 40

Re: de Broglie threshold

Wavelength properties cannot be detected if it is less than 10^-15 m. This usually applies to the wavelengths of larger objects.
by Jillian C 4C
Sat Nov 09, 2019 1:00 pm
Forum: Dipole Moments
Topic: Induced Dipole
Replies: 4
Views: 19

Re: Induced Dipole

When a polar molecule and non-polar molecule interact, the electrons are rearranged so as to create partial negative and partial positive charges that cause the induced dipole.
by Jillian C 4C
Sat Nov 09, 2019 12:57 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Strength
Replies: 9
Views: 24

Re: Bond Strength

Since covalent bonds only have partial charges, ionic bonds are stronger due to larger differences in electronegativity.
by Jillian C 4C
Mon Nov 04, 2019 12:12 am
Forum: Dipole Moments
Topic: Dipole Arrow
Replies: 5
Views: 24

Re: Dipole Arrow

In general, the arrow points to the negative dipole while the other end of the arrow has another line drawn perpendicular so as to make a + sign, indicating the positive dipole.
by Jillian C 4C
Mon Nov 04, 2019 12:09 am
Forum: Electronegativity
Topic: Ionic or covalent?
Replies: 17
Views: 95

Re: Ionic or covalent?

Ionic compounds usually have charges and include metals with nonmetals, while covalent compounds are mostly nonmetals.
by Jillian C 4C
Mon Nov 04, 2019 12:03 am
Forum: Formal Charge and Oxidation Numbers
Topic: formal charge
Replies: 7
Views: 28

Re: formal charge

I think you should only solve formal charge when the question asks or if there's resonance and you want to find the most stable structure.
by Jillian C 4C
Mon Nov 04, 2019 12:00 am
Forum: Lewis Structures
Topic: Valence Electrons
Replies: 2
Views: 9

Re: Valence Electrons

Since the outermost shell of Cu only has one electron in 4s1, then there is only 1 valence electron.
by Jillian C 4C
Sun Nov 03, 2019 11:58 pm
Forum: Resonance Structures
Topic: Resonance structures
Replies: 6
Views: 21

Re: Resonance structures

A resonance structure shows a compound with different electron arrangements.
by Jillian C 4C
Sat Oct 26, 2019 5:55 pm
Forum: Ionic & Covalent Bonds
Topic: lewis structures for diff bonds
Replies: 5
Views: 63

Re: lewis structures for diff bonds

Lewis structures are drawn for both covalent and ionic bonds. Ionic structures would have the electrons and brackets of each ion with its charge. Covalent structures can be drawn with lines connecting each other as they share their electrons.
by Jillian C 4C
Sat Oct 26, 2019 5:41 pm
Forum: Ionic & Covalent Bonds
Topic: Does the Octet Rule apply to Boron?
Replies: 14
Views: 67

Re: Does the Octet Rule apply to Boron?

Boron is more stable with 6 electrons and does not follow the octet rule.
by Jillian C 4C
Sat Oct 26, 2019 5:32 pm
Forum: Ionic & Covalent Bonds
Topic: Resonance
Replies: 12
Views: 72

Re: Resonance

Compounds with resonance involve delocalized electrons, leading to fewer repulsions and more stability.
by Jillian C 4C
Sat Oct 26, 2019 5:30 pm
Forum: Ionic & Covalent Bonds
Topic: ionization
Replies: 8
Views: 34

Re: ionization

There is less shielding and more protons after the first electron is removed. Therefore, more nuclear charge makes it more difficult for the next electron to be removed and will thus make the ionization energy higher.
by Jillian C 4C
Sat Oct 26, 2019 5:25 pm
Forum: Ionic & Covalent Bonds
Topic: Meaning of Brackets
Replies: 7
Views: 42

Re: Meaning of Brackets

The brackets indicate the closest noble gas's electronic configuration so that the configuration of the given atom does not have to start from 1s.
by Jillian C 4C
Sun Oct 20, 2019 11:00 pm
Forum: DeBroglie Equation
Topic: When to combine equations
Replies: 10
Views: 54

Re: When to combine equations

With a common variable, you can use substitution to make a new equation.
by Jillian C 4C
Sun Oct 20, 2019 11:00 pm
Forum: DeBroglie Equation
Topic: When to combine equations
Replies: 10
Views: 54

Re: When to combine equations

With a common variable, you can use substitution to make a new equation.
by Jillian C 4C
Sun Oct 20, 2019 10:54 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: What does the H mean?
Replies: 9
Views: 39

Re: What does the H mean?

The h is Planck's constant, which is 6.626x10^-34 J*s.
by Jillian C 4C
Sun Oct 20, 2019 10:48 pm
Forum: Properties of Electrons
Topic: Photons
Replies: 9
Views: 57

Re: Photons

If a photon does not have enough energy to eject an electron, the electron stays in the same energy level.
by Jillian C 4C
Sun Oct 20, 2019 10:46 pm
Forum: Properties of Light
Topic: homework 1A.3
Replies: 8
Views: 45

Re: homework 1A.3

As seen in the equation speed of light=(frequency)(wavelength), frequency and wavelength have an inverse relationship. Thus, when the frequency decreases, the wavelength increases.
by Jillian C 4C
Sun Oct 20, 2019 10:33 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Order or orbitals
Replies: 5
Views: 35

Re: Order or orbitals

When writing electronic configurations, the order goes from lowest energy to highest energy, and the 3d orbital has lower energy than 4s, so the 3d goes before the 4th level.
by Jillian C 4C
Mon Oct 14, 2019 2:16 am
Forum: DeBroglie Equation
Topic: De Broglie's Equation
Replies: 17
Views: 70

Re: De Broglie's Equation

The equation requires an object that has mass, but light does not have that. Thus, light cannot be used in this equation.
by Jillian C 4C
Mon Oct 14, 2019 2:14 am
Forum: DeBroglie Equation
Topic: Diffraction
Replies: 4
Views: 20

Re: Diffraction

Diffraction causes radiation to bend as it goes through an edge.
by Jillian C 4C
Mon Oct 14, 2019 2:06 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 67
Views: 846

Re: Rydberg equation [ENDORSED]

The Rydberg equation is 1/λ = RZ2(1/n1^2 - 1/n2^2), with R=Rydberg constant and Z=atomic number of the atom. This is used to find the light's wavelength of an electron moving through different energy levels.
by Jillian C 4C
Mon Oct 14, 2019 1:58 am
Forum: Properties of Light
Topic: When to use the Planck's Constant?
Replies: 6
Views: 30

Re: When to use the Planck's Constant?

Planck's constant can be used to find the energy emitted or absorbed at different levels with En = -hR / n^2. This has n= energy level, h=Planck's constant, R=constant value, and E=energy.
by Jillian C 4C
Sun Oct 13, 2019 10:42 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 3
Views: 46

Re: Photoelectric Effect

The photoelectric has to do with the emission of electrons in reference to the absorption of photons, while the atomic spectra indicate the wavelength to which atoms emit light.
by Jillian C 4C
Mon Oct 07, 2019 5:45 pm
Forum: Molarity, Solutions, Dilutions
Topic: Symbols for Molarity
Replies: 8
Views: 79

Re: Symbols for Molarity

Yes, c and M can be used interchangeably because c refers to concentration and M refers to molarity.
by Jillian C 4C
Mon Oct 07, 2019 5:28 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilutions
Replies: 3
Views: 31

Re: Dilutions

In finding the molarity, you would have to convert the volume to Liters in order to solve, because that is the unit of the volume in the formula of molarity.
by Jillian C 4C
Mon Oct 07, 2019 5:19 pm
Forum: Molarity, Solutions, Dilutions
Topic: G 23
Replies: 1
Views: 29

Re: G 23

To find the concentration of chloride ions in the solution, you would have to find the moles of 0.50g NaCl and 0.30g KCl then find the sum of those moles. From there, you would divide this sum by 0.100 L to find the concentration of the chloride ions.
by Jillian C 4C
Mon Oct 07, 2019 5:15 pm
Forum: Limiting Reactant Calculations
Topic: thereotical yield
Replies: 5
Views: 42

Re: thereotical yield

Typically, the theoretical yield is based on grams unless asked otherwise. It is a rare case for the theoretical yield to be in moles or any other unit.
by Jillian C 4C
Mon Oct 07, 2019 5:13 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 959

Re: Week 2 Homework Problems [ENDORSED]

There was an email sent out that said homework for Week 2 can cover both review topics and the quantum world. I would prefer to focus more on the review topics as there is a test coming up during discussions.
by Jillian C 4C
Wed Oct 02, 2019 11:42 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Homework Problem E.15
Replies: 4
Views: 66

Re: Homework Problem E.15

For this question, you would have to subtract the mass of (OH)2 from 74.10 g/mol to find the mass of M and see which element has the closest mass to that of M. After figuring out what element M is, add the molar mass of M and S to get the answer.
by Jillian C 4C
Wed Oct 02, 2019 11:39 am
Forum: Molarity, Solutions, Dilutions
Topic: Dilution and Molarity Questions
Replies: 8
Views: 44

Re: Dilution and Molarity Questions

In answering these types of problems, I write down the values that are given to me and think about the formula I can use, which is usually M1xV1=M2xV2. I figure out the desired molarity and volume as well as the initial molarity and volume, then plug those values into the formula.
by Jillian C 4C
Wed Oct 02, 2019 11:36 am
Forum: Empirical & Molecular Formulas
Topic: Mass % Composition
Replies: 7
Views: 62

Re: Mass % Composition

You would have to find the mass of the entire molecule as well as the masses of each element. Divide each element's mass by the entire molecule's mass and multiply each by 100% to get the mass percent composition.
by Jillian C 4C
Wed Oct 02, 2019 11:28 am
Forum: SI Units, Unit Conversions
Topic: Question about Showing Work
Replies: 22
Views: 138

Re: Question about Showing Work

Would it also be necessary to write out the formula being used in answering a question?
by Jillian C 4C
Wed Oct 02, 2019 11:25 am
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 115
Views: 10258

Re: All students read this sig fig post [ENDORSED]

Evamae Bayudan 1B wrote:Will we be penalized for putting extra significant figures?

I think we will be penalized since adding extra significant figures or removing them will result in an inaccurate response in the context of the question.

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