Search found 55 matches

by Aliya Jain 2B
Sun Jan 12, 2020 9:58 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Values of K and Meaning
Replies: 3
Views: 10

Re: Values of K and Meaning

k>1 does indicate that products are slightly more favored than reactants however I think k>10^3 guarantees favoritism.
by Aliya Jain 2B
Sun Jan 12, 2020 9:54 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Concentration affecting equilibrium
Replies: 5
Views: 14

Re: Concentration affecting equilibrium

I think that decreasing the concentration of products will decrease the reaction quotient while increasing the concentration pf products will increase the reaction quotient
by Aliya Jain 2B
Sun Jan 12, 2020 9:51 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Ice tables for partial pressures
Replies: 4
Views: 19

Re: Ice tables for partial pressures

Yes, both partial pressure and concentration can be used in ice tables
by Aliya Jain 2B
Sun Jan 12, 2020 9:48 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: "quick" way?
Replies: 4
Views: 21

Re: "quick" way?

The quick way is just knowing that when pressure is increasing, then the reaction will go towards the direction with less moles and when the pressure is decreasing, the reaction will go towards the direction with more moles. The longer way is realizing that when pressure is changing, the actual volu...
by Aliya Jain 2B
Sun Jan 12, 2020 9:42 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: What is this?
Replies: 21
Views: 94

Re: What is this?

What exactly does le chatelier's principle apply to? Is it just concentration of reactants/products, temperature, and pressure/volume or are there more factors that can be applied?
by Aliya Jain 2B
Sat Dec 07, 2019 6:05 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: dien
Replies: 3
Views: 37

Re: dien

dien is tridenate im pretty sure, and i think carbonate and nitrito might be ambidentate
by Aliya Jain 2B
Sat Dec 07, 2019 6:02 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: polydentate naming
Replies: 1
Views: 28

Re: polydentate naming

I think those are good, but maybe also sulfato? I'm not really sure if sulfato is considered bidentate though
by Aliya Jain 2B
Sat Dec 07, 2019 6:00 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 1
Views: 26

Re: Polydentate

I thought that carbonate was bidentate due to its 2 oxygens with -1 formal charge, but I have seen in a lot of places that it is monodentate bc it has 120 degree bond angles.
by Aliya Jain 2B
Sat Dec 07, 2019 5:57 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Shape of Coordination Compounds
Replies: 2
Views: 16

Re: Shape of Coordination Compounds

I think polydentates do affect shape of coordination compounds because they offer more than one binding site. For example, since en has two binding sites, it will increase the coordination compound by 2
by Aliya Jain 2B
Sat Dec 07, 2019 5:54 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Sulfato
Replies: 1
Views: 28

Sulfato

is sulfato bidentate since two oxygens have a -1 formal charge which can act as binding spots?
by Aliya Jain 2B
Sun Dec 01, 2019 11:59 pm
Forum: Lewis Acids & Bases
Topic: Definition
Replies: 7
Views: 39

Re: Definition

A Lewis acid is an electron-pair acceptor and a Lewis base is an electron-pair donor.
by Aliya Jain 2B
Sun Dec 01, 2019 11:57 pm
Forum: Lewis Acids & Bases
Topic: Long bonds vs Short bonds?
Replies: 9
Views: 56

Re: Long bonds vs Short bonds?

This is why acids with longer bonds are stronger, while acids with shorter bonds are acids. Strong acids with weak/long bonds can dissociate completely while weak acids with short/strong bonds cannot.
by Aliya Jain 2B
Sun Dec 01, 2019 11:53 pm
Forum: Lewis Acids & Bases
Topic: Weak vs. Strong
Replies: 8
Views: 37

Re: Weak vs. Strong

An example of a strong acid is HI, which has long/weak bonds and can dissociate completely. An example of a weak acid is HF, which has short/strong bonds and does not dissociate completely.
by Aliya Jain 2B
Sun Dec 01, 2019 11:49 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: 6D. 11
Replies: 1
Views: 30

Re: 6D. 11

For each molecule, look at what the products of dissociation are because they will indicate whether they are acids or bases. For example, NH4Br will dissociate into NH4+ + Br-. NH4+ is able to give up a proton so the solution will be acidic.
by Aliya Jain 2B
Sun Dec 01, 2019 11:42 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Oxoacids
Replies: 1
Views: 14

Re: Oxoacids

An oxoacid contains oxygen, contains at least one other element, and has at least one hydrogen atom bonded to the oxygen.
The oxoacids more readily lose a H+ if the resulting anion can be stabilized by electron withdrawing atoms.
by Aliya Jain 2B
Mon Nov 25, 2019 11:31 am
Forum: Hybridization
Topic: Hybridization Formulas
Replies: 2
Views: 29

Re: Hybridization Formulas

You just subtract 1 from the amount of bonding regions!
by Aliya Jain 2B
Mon Nov 25, 2019 11:30 am
Forum: Hybridization
Topic: Question 2F.15
Replies: 2
Views: 19

Re: Question 2F.15

viewtopic.php?p=2547&sid=0d36d6a0a83ae99de2b5592ede5e800f#p2547
Dr. Lavelle answered this question a couple years ago!
by Aliya Jain 2B
Mon Nov 25, 2019 11:26 am
Forum: Naming
Topic: Oxidation Numbers
Replies: 2
Views: 31

Re: Oxidation Numbers

The oxidation number of an atom is the charge that atom would have if the compound was composed of ions.
by Aliya Jain 2B
Mon Nov 25, 2019 11:23 am
Forum: Naming
Topic: Roman numerals
Replies: 6
Views: 31

Re: Roman numerals

For example, Ni (I) would represent the +1 oxidation number of nickel while Ni (II) represents the +2 oxidation number
by Aliya Jain 2B
Mon Nov 25, 2019 11:17 am
Forum: Lewis Acids & Bases
Topic: How to calculate pH and pOH
Replies: 2
Views: 36

Re: How to calculate pH and pOH

Then you can find the pOH by subtracting the pH you calculated from 14.
by Aliya Jain 2B
Sun Nov 17, 2019 4:02 pm
Forum: Dipole Moments
Topic: Dipole moments in trigonal bipyramidal shaped molecules
Replies: 4
Views: 23

Re: Dipole moments in trigonal bipyramidal shaped molecules

Different atoms often have differences in electronegativity which causes them to be polar even if their geometry is symmetrical.
by Aliya Jain 2B
Sun Nov 17, 2019 3:59 pm
Forum: Dipole Moments
Topic: 2E. 25a
Replies: 2
Views: 20

Re: 2E. 25a

Also, I think since the hydrogen atom is less electronegative than chlorine atom, there is a net dipole moment in the compound.
by Aliya Jain 2B
Sun Nov 17, 2019 3:55 pm
Forum: Dipole Moments
Topic: Polar vs. Non-polar bonds
Replies: 2
Views: 27

Re: Polar vs. Non-polar bonds

You can also look at molecular geometry. Sometimes certain structures indicate polarity. For example since h2o has a bent structure, it is also a polar molecule.
by Aliya Jain 2B
Sun Nov 17, 2019 3:50 pm
Forum: Dipole Moments
Topic: Polar and Non polar
Replies: 2
Views: 19

Re: Polar and Non polar

You can also use molecular geometry to find polarity. For example, lone pairs on oxygen in h2o cause there to be bent geometry, which thus indicates that the molecule is polar.
by Aliya Jain 2B
Sun Nov 17, 2019 3:47 pm
Forum: Dipole Moments
Topic: 3F.3
Replies: 2
Views: 12

Re: 3F.3

I think that the hydrogen atom is less electronegative than the chlorine atom so, there is a net dipole moment in the compound. Also, the arrangement of the bonded pairs is asymmetric,
by Aliya Jain 2B
Sun Nov 10, 2019 5:29 pm
Forum: Octet Exceptions
Topic: Reasoning for Octet Exception
Replies: 11
Views: 61

Re: Reasoning for Octet Exception

Also, expanded octets can occur in all elements starting period 3 and below!
by Aliya Jain 2B
Sun Nov 10, 2019 5:27 pm
Forum: Electronegativity
Topic: Ionization Energy vs. Electronegativity
Replies: 9
Views: 44

Re: Ionization Energy vs. Electronegativity

Also, electronegativity refers to the ability of an atom in a molecule to attract shared electrons. Ionization energy does not refer to molecules, only unbonded atoms.
by Aliya Jain 2B
Sun Nov 10, 2019 5:23 pm
Forum: Electronegativity
Topic: Differences in Electronegativity
Replies: 5
Views: 24

Re: Differences in Electronegativity

We probably need to the know the general trend of electronegativity, which is proportional to ionization energy
by Aliya Jain 2B
Sun Nov 10, 2019 5:18 pm
Forum: Bond Lengths & Energies
Topic: Bond Shape
Replies: 3
Views: 38

Re: Bond Shape

Since oxygen has the second highest electronegativity, it attracts electrons more strongly than hydrogen, thus causing an unequal sharing of electrons between the two atoms
by Aliya Jain 2B
Sun Nov 10, 2019 5:13 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Cancellation
Replies: 3
Views: 49

Re: Formal Charge Cancellation

Formal charge should be considered after the octet rule is observed in most cases!
by Aliya Jain 2B
Sun Nov 03, 2019 12:27 pm
Forum: Octet Exceptions
Topic: Boron
Replies: 2
Views: 27

Re: Boron

Boron has too few of electrons to provide an octet for every atom.
by Aliya Jain 2B
Sun Nov 03, 2019 12:17 pm
Forum: Bond Lengths & Energies
Topic: Strength of Bonds
Replies: 16
Views: 60

Re: Strength of Bonds

longer bonds are easier to break, so they are weaker. Shorter bonds are harder to break, so they are stronger.
by Aliya Jain 2B
Sun Nov 03, 2019 12:12 pm
Forum: Bond Lengths & Energies
Topic: Strength related to reactivity
Replies: 2
Views: 13

Re: Strength related to reactivity

Since longer bonds are weaker and easier to break, they are more likely to be involved in a reaction. Stronger bonds are shorter, harder to break, and less reactive.
by Aliya Jain 2B
Sun Nov 03, 2019 12:08 pm
Forum: Lewis Structures
Topic: Bonds
Replies: 4
Views: 26

Re: Bonds

Also, when you're deciding whether to use single, double, or triple bonds, make sure that the elements in the first or second period are observing the octet rule!
by Aliya Jain 2B
Sun Nov 03, 2019 12:05 pm
Forum: Lewis Structures
Topic: Formal charges on structures
Replies: 2
Views: 13

Re: Formal charges on structures

Yes, the best structures have elements with 0 formal charge. If not, the most electronegative element should carry the negative formal charge.
by Aliya Jain 2B
Sun Oct 27, 2019 3:22 pm
Forum: Trends in The Periodic Table
Topic: Ionization and Electron Affinity
Replies: 5
Views: 28

Re: Ionization and Electron Affinity

I'm pretty sure both the ionization energy and the electron affinity of an atom decrease as you go down a Group and increase as you go across a period. But there are some exceptions to these patterns.
by Aliya Jain 2B
Sun Oct 27, 2019 3:12 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Noble gas electron configurations
Replies: 3
Views: 25

Re: Noble gas electron configurations

I'm pretty sure the electron configuration of neon is 1s22s2p6, so I think there are actually two electrons in the 1S sub-shell.
by Aliya Jain 2B
Sun Oct 27, 2019 3:08 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: many electron atoms
Replies: 2
Views: 25

Re: many electron atoms

Does this also include electron affinity and IE?
by Aliya Jain 2B
Sun Oct 27, 2019 3:05 pm
Forum: Trends in The Periodic Table
Topic: 1F.3
Replies: 3
Views: 27

1F.3

"Place the following ions in order of increasing ionic radius: S^2-, Cl^-, P^3-." Since all of these ions have the same amount of electrons, are we supposed to take into account core charge?
by Aliya Jain 2B
Sun Oct 27, 2019 3:01 pm
Forum: Trends in The Periodic Table
Topic: Exceptions in the trends
Replies: 4
Views: 42

Re: Exceptions in the trends

Another example is that nitrogen's electron affinity is lower than carbon's and that Neon's is not only lower than fluorine's, but is actually lower than lithium's.These exceptions are also due to electron configurations!
by Aliya Jain 2B
Sun Oct 20, 2019 5:33 pm
Forum: *Shrodinger Equation
Topic: Shrodinger Equation
Replies: 3
Views: 32

Re: Shrodinger Equation

The Schrodinger equation is used to find the allowed energy levels of quantum mechanical systems
by Aliya Jain 2B
Sun Oct 20, 2019 5:31 pm
Forum: Photoelectric Effect
Topic: 1B.15
Replies: 2
Views: 29

1B.15

"The g-ray photons emitted by the nuclear decay of a technetium-99 atom used in radiopharmaceuticals have an energy of 140.511 keV. Calculate the wavelength of these g-rays" What is the unit keV?
by Aliya Jain 2B
Sun Oct 20, 2019 5:29 pm
Forum: Einstein Equation
Topic: When do we use the Einstein Equation?
Replies: 14
Views: 129

Re: When do we use the Einstein Equation?

Im pretty sure it's used a lot because you can also isolate frequency in λv=C and subsitute it back into E=hv to find wavelength.
by Aliya Jain 2B
Sun Oct 20, 2019 5:10 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Series
Replies: 3
Views: 30

Re: Series

The principal quantum number for the lower energy level involved is the same for each absorption line in a series. For example, Paschen series are the series of lines in the spectrum of the hydrogen atom which corresponds to transitions between the state with principal quantum number n = 3 and succe...
by Aliya Jain 2B
Sun Oct 20, 2019 5:00 pm
Forum: DeBroglie Equation
Topic: 1B.21
Replies: 3
Views: 41

1B.21

1B.21 reads "A baseball must weigh between 5.00 and 5.25 ounces (1 ounce 5 28.3 g). What is the wavelength of a 5.15-ounce baseball thrown at 92 mph?" I understand the basic premise of the question, but I'm kind of confused about the conversations? Can someone explain the initial steps
by Aliya Jain 2B
Sun Oct 13, 2019 10:42 am
Forum: Photoelectric Effect
Topic: 1B.9
Replies: 2
Views: 20

1B.9

"A lamp rated at 32 W (1 W 5 1 J?s21) emits violet light of wavelength 420 nm. How many photons of violet light can the lamp generate in 2.0 s? How many moles of photons are emitted in that time interval?" Can someone explain the initial step to figure this question out?
by Aliya Jain 2B
Sun Oct 13, 2019 10:37 am
Forum: Photoelectric Effect
Topic: Proportional sign
Replies: 4
Views: 38

Re: Proportional sign

I'm not sure if this is what you mean, but the symbol ∝ is used for variables that are directly proportional to each other!
by Aliya Jain 2B
Sun Oct 13, 2019 10:26 am
Forum: Properties of Electrons
Topic: Constructive vs Destructive Inference
Replies: 4
Views: 30

Re: Constructive vs Destructive Inference

Constructive interference happens when two waves meet so that their crests line up together, which results in a wave with a higher amplitude. In destructive interference, the crest of one wave meets the trough of another, resulting in a lower total amplitude. The Khan academy video about this is rea...
by Aliya Jain 2B
Sun Oct 13, 2019 10:22 am
Forum: Properties of Light
Topic: 1A.3
Replies: 3
Views: 34

1A.3

For this question, I was able to use process of elimination, but I'm still pretty confused on the relationship between the frequency of electromagnetic radiation and the slope of the electric field. Does anyone know why they're related?
by Aliya Jain 2B
Sun Oct 13, 2019 10:14 am
Forum: Properties of Light
Topic: 1A.11
Replies: 2
Views: 25

1A.11

Question 1A.11 asks: In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series. What is common to the lines within a series that makes grouping them together logical? Does anyone know how to approach this question? I'm a little confused on the conce...
by Aliya Jain 2B
Thu Oct 03, 2019 1:24 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Avogadro's Number?
Replies: 16
Views: 156

Re: Avogadro's Number?

Avogadro's number should be used if a problem asks for formula units, atoms, or molecules. To convert something to molecules or formula units, multiple moles by Avogadro's number. An example of this would be problem E.9 parts a and b.
by Aliya Jain 2B
Thu Oct 03, 2019 1:19 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: F.13 homework problem
Replies: 4
Views: 57

Re: F.13 homework problem

Since phosphorus and chlorine are covalently bonded together, they make a covalent compound. Simple covalent compounds are generally named by using prefixes to indicate how many atoms of each element are shown in the formula. Also, the ending of the last (most negative) element is changed to -ide. T...
by Aliya Jain 2B
Thu Oct 03, 2019 1:00 pm
Forum: Empirical & Molecular Formulas
Topic: Test Materials
Replies: 13
Views: 112

Re: Test Materials

Avogadro's number was given to me on formula sheets in my high school chemistry class, so I think it could be on there, but it might be safer to just memorize it.
by Aliya Jain 2B
Thu Oct 03, 2019 12:56 pm
Forum: Significant Figures
Topic: significant figures
Replies: 5
Views: 66

Re: significant figures

I'm pretty sure they're all right. Any zeros between two significant digits are significant. Also, a final zero or trailing zeros in the decimal portion only are significant.
by Aliya Jain 2B
Thu Oct 03, 2019 12:47 pm
Forum: Significant Figures
Topic: General sig figs question
Replies: 5
Views: 53

General sig figs question

Does anyone know the rules for sig figs when adding or subtracting? I know that it differs from multiplying/dividing, but I don't remember how.

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