Search found 50 matches
- Sun Dec 08, 2019 7:06 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: pH formula?
- Replies: 69
- Views: 3559
Re: pH formula?
the pH is calculated using the formula: pH= -log[H3O+]
- Sun Dec 08, 2019 7:03 pm
- Forum: Lewis Acids & Bases
- Topic: neutralization
- Replies: 6
- Views: 547
Re: neutralization
neutralization occurs when an acid and a base react to form a salt and water
- Sun Dec 08, 2019 6:59 pm
- Forum: Bronsted Acids & Bases
- Topic: Hydrogen Bonding
- Replies: 16
- Views: 1027
Re: Hydrogen Bonding
no, because it is an intermolecular force
- Sun Dec 08, 2019 6:58 pm
- Forum: Bronsted Acids & Bases
- Topic: NH3
- Replies: 5
- Views: 1141
Re: NH3
you cannot assume it is a base because it is amphiprotic (it can act as an acid or a base)
- Sun Dec 08, 2019 6:56 pm
- Forum: Conjugate Acids & Bases
- Topic: Bronsted vs Conjugate
- Replies: 3
- Views: 376
Re: Bronsted vs Conjugate
a bronsted acid is the proton donator. a conjugate acid is just the resulting acid in the products of a reaction that is formed when a bronsted base accepts a proton
- Sun Dec 01, 2019 11:39 pm
- Forum: Bronsted Acids & Bases
- Topic: Water as an acid and base
- Replies: 7
- Views: 561
Re: Water as an acid and base
water is amphoteric, which means that it can either donate or accept protons
- Sun Dec 01, 2019 11:34 pm
- Forum: Lewis Acids & Bases
- Topic: Weak vs. Strong
- Replies: 8
- Views: 694
Re: Weak vs. Strong
strong acids dissociate completely in solution, while strong bases dissociate completely in water
- Sun Dec 01, 2019 11:18 pm
- Forum: Amphoteric Compounds
- Topic: Identifying Them?
- Replies: 12
- Views: 841
Re: Identifying Them?
amphoteric compounds are able to donate and accept protons (hydrogen atoms)
- Sun Dec 01, 2019 11:16 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Neutralization
- Replies: 7
- Views: 434
Re: Neutralization
it occurs between an acid an a base and produces water(h2o) and salt
- Sun Dec 01, 2019 11:13 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acids Vs. Bases
- Replies: 11
- Views: 839
Re: Acids Vs. Bases
acids donate protons, while bases accept protons
- Sun Nov 24, 2019 11:12 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Bronsted vs. Lewis Acids
- Replies: 9
- Views: 487
Re: Bronsted vs. Lewis Acids
Lewis acids accepts electrons, while Bronsted acids donate protons (H+). They are essentially the same, but one looks at electrons, while the other focuses on protons
- Sun Nov 24, 2019 11:07 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted vs Lewis acids
- Replies: 5
- Views: 360
Re: Bronsted vs Lewis acids
Bronsted acids donate protons, while Lewis acids accept electrons
- Sun Nov 24, 2019 11:04 pm
- Forum: Lewis Acids & Bases
- Topic: Lewis acids + bases and Bronsted acids + bases
- Replies: 6
- Views: 442
Re: Lewis acids + bases and Bronsted acids + bases
Bronsted acids and and bases refers to the donating and accepting of protons, while Lewis acids and bases refers to the donating and accepting of electrons
- Sun Nov 24, 2019 11:00 pm
- Forum: Lewis Acids & Bases
- Topic: Proton acceptor and proton donor?
- Replies: 33
- Views: 2018
Re: Proton acceptor and proton donor?
the proton donor is the acid, and the base is the proton acceptor
- Sun Nov 24, 2019 10:56 pm
- Forum: Lewis Acids & Bases
- Topic: HCl vs HF
- Replies: 19
- Views: 1312
Re: HCl vs HF
the electronegativity of chlorine is less than fluorine, so HCl is the stronger acid, because it can dissociate more easily than HF
- Sun Nov 17, 2019 10:34 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: bond angles
- Replies: 8
- Views: 423
Re: bond angles
lone pairs have the greatest repulsion strength, and they repulse electrons of other atoms, which push the atoms closer together and decrease the bond angles
- Sun Nov 17, 2019 10:32 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: types of bonds
- Replies: 14
- Views: 1155
Re: types of bonds
yes, a single bond has 1 sigma bond, and bonds after that are pi bonds
- Sun Nov 17, 2019 10:26 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 7
- Views: 422
Re: Bond Angles
lone pairs repulse electrons of other atoms and decrease bond angles
- Sun Nov 17, 2019 10:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: dipole moments
- Replies: 11
- Views: 577
Re: dipole moments
in two atoms, dipoles cancel out when the dipoles are facing opposite directions
- Sun Nov 17, 2019 10:18 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone Pairs
- Replies: 10
- Views: 511
Re: Lone Pairs
lone pairs repulse the electrons of other atoms, which affects molecular geometry
- Sun Nov 10, 2019 5:15 pm
- Forum: Dipole Moments
- Topic: What's a dipole
- Replies: 4
- Views: 268
Re: What's a dipole
How do you determine whether a dipole is occurring?
- Sun Nov 10, 2019 5:10 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: Ion-Dipole Forces
- Replies: 4
- Views: 211
Re: Ion-Dipole Forces
you can determine whether ion-dipole forces are occurring if attraction occurs between an ion and a neutral molecule with a dipole.
- Sun Nov 10, 2019 4:40 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: D Subshell
- Replies: 7
- Views: 716
Re: D Subshell
the d-subshell can hold a maximum of 10 electrons. it holds 2 electrons in each of its 5 orbitals.
- Sun Nov 10, 2019 4:14 pm
- Forum: Photoelectric Effect
- Topic: frequency and ejection of electrons
- Replies: 7
- Views: 736
Re: frequency and ejection of electrons
increasing the frequency will increase the kinetic energy of ejected electrons. this is only true if the threshold energy is met
- Sun Nov 10, 2019 4:08 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: How to Draw Dipole Arrows
- Replies: 8
- Views: 2654
Re: How to Draw Dipole Arrows
i am still confused on dipole moments... don't all ions have dipole moments because of their different electronegativities?
- Sun Nov 03, 2019 10:08 pm
- Forum: Bond Lengths & Energies
- Topic: Single bond vs double bond
- Replies: 14
- Views: 821
Re: Single bond vs double bond
the numbers are the bond length, which is measured in Angstroms. Double bonds are shorter than single bonds which is why the bond length for the double bond was less (shorter) than the length for the single bond
- Sun Nov 03, 2019 10:01 pm
- Forum: Bond Lengths & Energies
- Topic: Strength of Bonds
- Replies: 16
- Views: 622
Re: Strength of Bonds
shorter bonds are stronger and harder to break, while longer bonds are weaker
- Sun Nov 03, 2019 9:35 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Water molecules
- Replies: 9
- Views: 916
Re: Water molecules
both hydrogens are used to form hydrogen bonds
- Sun Nov 03, 2019 9:28 pm
- Forum: Hybridization
- Topic: Electrons
- Replies: 13
- Views: 1222
Re: Electrons
this means that an electron is excited and moves to a higher energy level
- Sun Nov 03, 2019 9:27 pm
- Forum: Hybridization
- Topic: Noble Configuration vs. Full
- Replies: 7
- Views: 311
Re: Noble Configuration vs. Full
i'm pretty sure that if the question doesn't specify, then writing the noble gas configuration is fine
- Sun Oct 27, 2019 9:11 pm
- Forum: Ionic & Covalent Bonds
- Topic: Metals Vs. Nonmetals
- Replies: 8
- Views: 553
Re: Metals Vs. Nonmetals
metals usually form cations and nonmetals form anions. whether an atom forms a cation or an anion depends on their number of valence electrons. if they have a low number of valence electrons, like metals, then it is easier for them to lose electrons in order to gain a full octet. in contrast, if ato...
- Sun Oct 27, 2019 9:01 pm
- Forum: Resonance Structures
- Topic: Octet
- Replies: 13
- Views: 776
Re: Octet
an octet means that an atom has 8 valence electrons, which is usually the most stable configuration for an atom. this is why some atoms are found in their most stable configuration as cations or anions, as this provides them with an octet. noble gases have an octet, which makes them the most stable....
- Sun Oct 27, 2019 8:54 pm
- Forum: Bond Lengths & Energies
- Topic: bond lengths for single or double bonds
- Replies: 7
- Views: 410
Re: bond lengths for single or double bonds
single bonds are longer than double bonds
- Sun Oct 27, 2019 8:52 pm
- Forum: Lewis Structures
- Topic: Choosing the central atom
- Replies: 16
- Views: 734
Re: Choosing the central atom
the atom that has the lowest ionization energy is the central atom! ionization energy decreases down a group and increases across a period
- Sun Oct 27, 2019 8:50 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Formula
- Replies: 5
- Views: 261
Re: Formal Charge Formula
shared electrons are the electrons that are involved in covalent bonds. since they are being shared, each atom receives one out of the 2, so you must divide by 2 because you are only calculating the formal charge for one of the atoms
- Sat Oct 19, 2019 1:06 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: quantum number n, l, m
- Replies: 13
- Views: 415
Re: quantum number n, l, m
how are orbitals, shells, and subshells related to one another? im not sure i understand
- Sat Oct 19, 2019 1:04 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Nodal Planes
- Replies: 10
- Views: 241
Re: Nodal Planes
if atoms with more electrons have more places where electrons can be found, why does this also increase the amount of nodal planes in that atom?
- Sat Oct 19, 2019 1:02 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: electron spin arrows
- Replies: 6
- Views: 313
Re: electron spin arrows
electrons have a negative charge, so they like to be as far away from each other as possible. This is why Hund's Rule states that electrons have to be parallel, and in separate orbitals, before they are paired in the same orbital.
- Sat Oct 19, 2019 12:36 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Electron configuration with s and d subshells
- Replies: 4
- Views: 143
Re: Electron configuration with s and d subshells
As they are filling up, if the energies of the two orbitals fluctuate and change, then why is it always the case that 4s comes before 3d? if they are fluctuating, then shouldn't 3d sometimes come before 4s?
- Sat Oct 19, 2019 12:21 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Spin State
- Replies: 6
- Views: 207
Re: Spin State
I am still confused about the 1/2. Why can't we just say that one is positive and one is negative? or why isn't it a +1 and a -1?
- Fri Oct 11, 2019 7:11 pm
- Forum: Properties of Electrons
- Topic: electron energy [ENDORSED]
- Replies: 7
- Views: 500
Re: electron energy [ENDORSED]
electrons need energy to move up energy levels, so when an electron moves up energy levels, it absorbs energy. in contrast, when an electron moves down energy levels, releases/emits energy.
- Fri Oct 11, 2019 6:23 pm
- Forum: DeBroglie Equation
- Topic: exhibiting wave-like properties
- Replies: 4
- Views: 594
Re: exhibiting wave-like properties
in lecture, he said that any moving particle has wavelike properties with wavelength, but these wavelengths are not detectable when they are less than 10^-15m
- Fri Oct 11, 2019 6:19 pm
- Forum: Properties of Light
- Topic: Energy Levels
- Replies: 8
- Views: 430
Re: Energy Levels
when an electron drops down from a higher energy level into n=1, a large amount of energy is released, which corresponds to the ultraviolet region because it is the highest energy
- Fri Oct 11, 2019 6:08 pm
- Forum: Properties of Light
- Topic: Speed of Light
- Replies: 41
- Views: 2698
Re: Speed of Light
the speed of light is constant ! because it will never change
- Fri Oct 11, 2019 6:05 pm
- Forum: Properties of Electrons
- Topic: Constructive and Destructive Interference
- Replies: 4
- Views: 336
Re: Constructive and Destructive Interference
why does destructive interference/waves that are out of phase sometimes cause there to be no wave at all?
- Fri Oct 04, 2019 8:48 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Wrong Textbook
- Replies: 12
- Views: 1252
Re: Wrong Textbook
I have the 6th edition and the homework problems are just about the same as the 7th edition, so you would be okay with that edition of the textbook
- Fri Oct 04, 2019 8:45 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Accuracy v Precision
- Replies: 11
- Views: 496
Re: Accuracy v Precision
a measurement's accuracy is how close it is to the true value. precision is how close measurements are to one another (aka consistency), whether or not it is close to the true value
- Fri Oct 04, 2019 8:35 pm
- Forum: SI Units, Unit Conversions
- Topic: Homework
- Replies: 9
- Views: 456
Re: Homework
Yeah I don't think it matters. I do mine in pencil in case I make a mistake
- Fri Oct 04, 2019 8:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: using older edition textbook
- Replies: 8
- Views: 524
Re: using older edition textbook
I'm using the 6th edition and it's definitely usable ! There are just some questions here and there that are slightly different than the 7th edition.
- Thu Oct 03, 2019 4:05 pm
- Forum: SI Units, Unit Conversions
- Topic: Discussion Credit
- Replies: 7
- Views: 387
Re: Discussion Credit
Yes, it's 5 posts and 5 homework problems per week... 5 & 5 to stay alive !