Search found 50 matches

by HuyHa_1D
Sat Dec 07, 2019 2:39 pm
Forum: Dipole Moments
Topic: Dipole Moments Cancel in Tetrahedral?
Replies: 5
Views: 21

Re: Dipole Moments Cancel in Tetrahedral?

If you draw out the proper shape, then obviously the molecule will be polar because of dipoles that aren't canceling each other out. So, it's only if the molecules are the same where the dipoles would cancel each other out.
by HuyHa_1D
Sat Dec 07, 2019 2:32 pm
Forum: Ionic & Covalent Bonds
Topic: Nonpolar and polar
Replies: 1
Views: 14

Re: Nonpolar and polar

You should see if the dipoles cancel out in the molecule. If they cancel, then it's nonpolar and if they don't then it's polar.
by HuyHa_1D
Sat Dec 07, 2019 2:04 pm
Forum: Hybridization
Topic: Resonance
Replies: 1
Views: 10

Re: Resonance

You would typically only find the hybridization for the most stable resonance structure so I don't think you'd need to show the other resonance structures only the stable one.
by HuyHa_1D
Sat Dec 07, 2019 2:01 pm
Forum: Hybridization
Topic: Question 2F.3
Replies: 1
Views: 9

Re: Question 2F.3

The more stable structure would be preferred. So, it's the one where S has two double bonds each connected to an O and a lone pair on top of S as well. Count the sigma and pi bonds for that structure.
by HuyHa_1D
Sat Dec 07, 2019 1:58 pm
Forum: Hybridization
Topic: Lone pairs
Replies: 4
Views: 16

Re: Lone pairs

Yes, they do because they're also electron groups.
by HuyHa_1D
Sat Nov 30, 2019 7:47 am
Forum: Calculating the pH of Salt Solutions
Topic: pH vs. pOH
Replies: 17
Views: 89

Re: pH vs. pOH

pH measures acidity whereas pOH measures basicity. Both are primarily measured on a scale from 0-14 so if the pH is 4 then the pOH is 10 and so on.
by HuyHa_1D
Sat Nov 30, 2019 7:42 am
Forum: Lewis Acids & Bases
Topic: HCl vs HF
Replies: 19
Views: 85

Re: HCl vs HF

Cl is less electronegative than F which makes it easier to dissociate which makes HCl the stronger acid.
by HuyHa_1D
Sat Nov 30, 2019 7:36 am
Forum: Bronsted Acids & Bases
Topic: Bronsted Acid and base
Replies: 8
Views: 31

Re: Bronsted Acid and base

A Lewis acid accepts an e- pair while a Lewis base donates an e- pair. Bronsted acids donate protons while bronsted bases accepts protons.
by HuyHa_1D
Sat Nov 30, 2019 7:31 am
Forum: Hybridization
Topic: Resonance Structures and hybridization
Replies: 1
Views: 13

Re: Resonance Structures and hybridization

I think you're supposed to use the hybridization of the most stable resonance structure which you can find through formal charge.
by HuyHa_1D
Sat Nov 30, 2019 7:28 am
Forum: Lewis Acids & Bases
Topic: Proton acceptor and proton donor?
Replies: 33
Views: 96

Re: Proton acceptor and proton donor?

Bronsted Acids donate protons and Bronsted Bases accepts protons.
by HuyHa_1D
Thu Nov 21, 2019 10:47 pm
Forum: Formal Charge and Oxidation Numbers
Topic: When to Use Formal Charge
Replies: 4
Views: 35

Re: When to Use Formal Charge

Formal charge tells you which resonance structure is more stable so with it you'll be able to find the preferred form of a molecule
by HuyHa_1D
Thu Nov 21, 2019 10:45 pm
Forum: Bond Lengths & Energies
Topic: Boiling Point
Replies: 7
Views: 47

Re: Boiling Point

Both SiH4 and SiF4 are nonpolar which mean that they only display LDF forces. So when both molecules have LDF you look at the size. The F is more bigger than H so SiF4 is the bigger one of the two which makes it have stronger LDF forces so higher boiling point.
by HuyHa_1D
Thu Nov 21, 2019 10:28 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Sigma and Pi Bonds
Replies: 15
Views: 51

Re: Sigma and Pi Bonds

You don't need to order the bonds. Just know how many sigma and pi bonds are present in each kind of bond (Triple Bond = 1 Sigma Bond and 2 Pi Bonds,etc.)
by HuyHa_1D
Thu Nov 21, 2019 10:04 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 Rules
Replies: 6
Views: 46

Re: Hydrogen Bonding Rules

Each lone pair is a potential hydrogen bonding site, so in your case a nitrogen atom with TWO lone pairs would have TWO potential hydrogen bonding sites.
by HuyHa_1D
Thu Nov 21, 2019 9:52 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: 3F 15
Replies: 5
Views: 20

Re: 3F 15

You would consider the weight if both molecules are not polar which is not the case here. AsF3 displays dipole-dipole interactions which indicates it's polar while AsF5 only displays LDF forces so it's not polar. Dipole-dipole is stronger than any LDF so AsF3 would have the higher boiling point.
by HuyHa_1D
Sat Nov 16, 2019 5:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR and Polarity
Replies: 4
Views: 20

VSEPR and Polarity

Just for confirmation, what do you generally look at in a VSEPR model to determine polarity of a molecule?
by HuyHa_1D
Sat Nov 16, 2019 5:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polar vs nonpolar
Replies: 6
Views: 33

Re: polar vs nonpolar

Generally, you can't really determine polarity just off of the molecular formula which is why you use the VSEPR models to determine it as it is the actual accurate representation of the molecule.
by HuyHa_1D
Sat Nov 16, 2019 5:01 pm
Forum: Sigma & Pi Bonds
Topic: sigma bonds
Replies: 3
Views: 26

Re: sigma bonds

Depending on which two atoms that have bonds together, they may have a single bond (1 sigma bond), a double bond (1 sigma and 1 pi bond), or a triple bond (1 sigma and 2 pi bonds).
by HuyHa_1D
Sat Nov 16, 2019 4:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Symmetry and Polarity
Replies: 13
Views: 66

Re: Symmetry and Polarity

Symmetry shouldn't really be what you're looking for to determine polarity but rather use the VSEPR models instead because VSEPR models are the actual representation and Lewis structures are just inaccurate base models.
by HuyHa_1D
Sat Nov 16, 2019 4:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent or Angular
Replies: 13
Views: 82

Re: Bent or Angular

Bent and angular are the same thing, but I'd probably use angular just because it's how the book calls it.
by HuyHa_1D
Sat Nov 09, 2019 9:08 pm
Forum: Dipole Moments
Topic: Dipole-dipole, LDF, HB
Replies: 1
Views: 16

Re: Dipole-dipole, LDF, HB

Dipole-dipole is when the positive end of a molecule and the negative end of another molecule attract, LDF is when electrons create temporary dipoles, and hydrogen bonds is when a hydrogen atom bonds with a highly electronegative atom (N,F,O). In terms of energy needed to break these interactions, L...
by HuyHa_1D
Sat Nov 09, 2019 8:22 pm
Forum: Dipole Moments
Topic: Induced Dipole-Induced Dipole Interactions
Replies: 1
Views: 14

Re: Induced Dipole-Induced Dipole Interactions

It's when a molecule with a dipole comes in contact with an atom with no dipole. The electrons in the atom then react to the molecule to create a dipole in the atom itself.
by HuyHa_1D
Sat Nov 09, 2019 8:08 pm
Forum: Dipole Moments
Topic: Electronegativity on Dipoles
Replies: 3
Views: 12

Re: Electronegativity on Dipoles

The bigger the electronegativity difference, the greater the dipole moment will be. And yes, if there if is any difference in the electronegativity, then you should consider that there is a dipole moment.
by HuyHa_1D
Sat Nov 09, 2019 7:46 pm
Forum: Electronegativity
Topic: Differences
Replies: 2
Views: 14

Re: Differences

Ionization is the process of forming ions by losing or gaining electrons, electron affinity is like how likely the atom is to gain an electron, and electronegativity is how likely the atom would take an electron.
by HuyHa_1D
Sat Nov 09, 2019 7:40 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Strength
Replies: 12
Views: 49

Re: Bond Strength

Aside from looking at the electronegativity aspect, I think of it as how covalent bonds pretty much involve the sharing of electrons whereas ionic bonds involve the attractions of opposite charged ions which makes it much more harder to break.
by HuyHa_1D
Sat Nov 02, 2019 2:18 am
Forum: Ionic & Covalent Bonds
Topic: Anions and Cations
Replies: 9
Views: 48

Re: Anions and Cations

Anions gain electrons whereas cations lose electrons so basically anions get heavier and cations get lighter.
by HuyHa_1D
Sat Nov 02, 2019 2:14 am
Forum: Lewis Structures
Topic: central atom
Replies: 16
Views: 107

Re: central atom

The electron with the least electronegativity is the one that is the central atom but pretty much most of the time it's the element with the least amount of atoms in the molecule.
by HuyHa_1D
Sat Nov 02, 2019 2:11 am
Forum: Lewis Structures
Topic: Electrons Moving Around
Replies: 3
Views: 20

Re: Electrons Moving Around

Electrons don't really leave, but rather they are shared among atoms to form ions.
by HuyHa_1D
Sat Nov 02, 2019 2:04 am
Forum: Sigma & Pi Bonds
Topic: Significance of sigma and pi bonds
Replies: 4
Views: 31

Re: Significance of sigma and pi bonds

Pretty much single bonds contain one sigma bond, double bonds contain a sigma and a pi bond, and triple bonds have one sigma and two pi bonds.
by HuyHa_1D
Sat Nov 02, 2019 1:52 am
Forum: DeBroglie Equation
Topic: When to use the de Broglie equation?
Replies: 5
Views: 37

Re: When to use the de Broglie equation?

Yeah, you pretty much use the De Broglie equation when you're given or given enough to find either the mass, velocity, or wavelength of an object that is not massless.
by HuyHa_1D
Sat Nov 02, 2019 1:45 am
Forum: Trends in The Periodic Table
Topic: Noble Gases
Replies: 10
Views: 23

Re: Noble Gases

Noble gases have full valence shells which make them not needing to take or give any electrons which exclude them from the trends.
by HuyHa_1D
Sat Nov 02, 2019 1:41 am
Forum: Properties of Electrons
Topic: Mass of an Electron
Replies: 14
Views: 102

Re: Mass of an Electron

Electrons in any element or whatever else they're present in all have the same size which is 9.10938356 × 10^-31 kilograms.
by HuyHa_1D
Sat Nov 02, 2019 1:39 am
Forum: Properties of Electrons
Topic: Formal Charge of an Atom
Replies: 5
Views: 44

Re: Formal Charge of an Atom

Formal charge is calculated by utilizing the formula: Valence Electrons - (# of Lone Electron Pairs + # of Bonding Electrons/2).
by HuyHa_1D
Sat Nov 02, 2019 1:33 am
Forum: Properties of Electrons
Topic: Electron removal
Replies: 11
Views: 70

Re: Electron removal

The further the electrons are from the nucleus, the less the force of attraction is from the protons to the electrons, hence the further electrons are easier to remove.
by HuyHa_1D
Sat Nov 02, 2019 1:30 am
Forum: Properties of Light
Topic: Speed of light
Replies: 13
Views: 71

Re: Speed of light

Electromagnetic radiation move at the same speed as the speed of light hence we use the constant 2.998 x 10^8 m/s for both subjects.
by HuyHa_1D
Sat Oct 19, 2019 2:53 pm
Forum: Quantum Numbers and The H-Atom
Topic: Spectral Series
Replies: 3
Views: 38

Re: Spectral Series

Each series has their own range of wavelengths. Once you've found the wavelength the photon's at, then you can just link them to whichever series involves that range.
by HuyHa_1D
Sat Oct 19, 2019 2:50 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Paired Electrons
Replies: 5
Views: 34

Re: Paired Electrons

To add on to that, each orbital is placed one electron at a time. When all of the orbitals have been placed and there are still more electrons, then each one will be paired up with each electron that was already placed in the orbitals.
by HuyHa_1D
Sat Oct 19, 2019 2:45 pm
Forum: DeBroglie Equation
Topic: De Broglie's Equation
Replies: 17
Views: 83

Re: De Broglie's Equation

Photons don't have mass so the equation isn't applicable for it.
by HuyHa_1D
Sat Oct 19, 2019 2:42 pm
Forum: Properties of Electrons
Topic: Wave Function
Replies: 5
Views: 57

Re: Wave Function

Wave functions just tell us what the shape of the orbitals so you can basically tell where the electron's going to be.
by HuyHa_1D
Sat Oct 19, 2019 2:37 pm
Forum: Properties of Light
Topic: Quantum equations
Replies: 5
Views: 21

Re: Quantum equations

Honestly, any unit of distance in the metric system per a unit of time is fine because they can all be converted anyway, but normally people write it as m/s or maybe unless otherwise stated.
by HuyHa_1D
Sat Oct 12, 2019 4:42 pm
Forum: Properties of Light
Topic: Amplitude
Replies: 12
Views: 89

Re: Amplitude

Amplitude just indicates how high or low the waves themselves travel. But in terms of its relationship to frequency and wavelength, it probably doesn't matter as amplitude isn't present in the equations that we've been using so far.
by HuyHa_1D
Sat Oct 12, 2019 4:34 pm
Forum: *Black Body Radiation
Topic: Black Body Radiation
Replies: 12
Views: 83

Re: Black Body Radiation

More specifically, it's thermal electromagnetic radiation.
by HuyHa_1D
Sat Oct 12, 2019 4:31 pm
Forum: Properties of Light
Topic: Speed of Light
Replies: 41
Views: 849

Re: Speed of Light

The speed of light won't because it's a constant but sometimes they might be displayed differently due to sig figs and rounding and whatnot.
by HuyHa_1D
Sat Oct 12, 2019 4:29 pm
Forum: Properties of Electrons
Topic: Electron After Excited State
Replies: 7
Views: 29

Re: Electron After Excited State

When the electron reaches an excited state, it jumps to a higher energy level where they release photons to go back to the original state.
by HuyHa_1D
Sat Oct 12, 2019 4:17 pm
Forum: Einstein Equation
Topic: Planck's Constant
Replies: 3
Views: 31

Re: Planck's Constant

The relationship is displayed in E(energy)=h(Planck's constant)v(frequency). Planck's constant is the constant of proportionality which shows the direct relationship between energy and frequency. The higher the frequency, the higher the energy output, and vice versa. The Planck's constant doesn't re...
by HuyHa_1D
Fri Oct 04, 2019 9:06 pm
Forum: Limiting Reactant Calculations
Topic: Percent or theoretical yield
Replies: 14
Views: 117

Re: Percent or theoretical yield

Percent yield is basically the ratio of actual yield to theoretical yield, and theoretical yield is the maximum amount of product that you can possibly get based off of your limiting reactant.
by HuyHa_1D
Fri Oct 04, 2019 9:01 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 3
Views: 21

Re: Sig Figs

Usually when you're adding or subtracting you tend to round your answer to the least number of places to the decimal point in the problem. Ex: 1.234+1.2 gives you 2.434 but you round it to 2.4. And as for multiplying or dividing you literally just use the smallest number of sig figs out of the value...
by HuyHa_1D
Thu Oct 03, 2019 7:03 pm
Forum: SI Units, Unit Conversions
Topic: Formula Names
Replies: 7
Views: 59

Re: Formula Names

Most of the problems you'll do will require you to write out chemical equations so yeah, you'll pretty much have to remember polyatomic ions especially in case the question won't give you the chemical formula for the compounds that you'll need.
by HuyHa_1D
Thu Oct 03, 2019 6:43 pm
Forum: Balancing Chemical Reactions
Topic: Fractions in Balancing Equations
Replies: 11
Views: 106

Re: Fractions in Balancing Equations

Typically, if you can't use a whole number as a stoichiometric coefficient for whatever it is you're balancing is when you use a fraction. It's so you can just multiply every coefficient in the equation with the denominator of the fraction to get all the coefficients as whole numbers without messing...
by HuyHa_1D
Thu Oct 03, 2019 6:40 pm
Forum: SI Units, Unit Conversions
Topic: Chemistry Community Question
Replies: 3
Views: 37

Re: Chemistry Community Question

I thought they were due this Friday, but apparently it's due this Sunday.

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