Search found 60 matches

by BritneyP- 2c
Thu Jan 16, 2020 11:27 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc vs Kp
Replies: 5
Views: 9

Re: Kc vs Kp

You can use Kc with gases, but then they would usually provide the Kc for the gas already so that you can find one of the products or reactants, or they give you the molarity of the products and reactants. If they don't, then typically you use Kp
by BritneyP- 2c
Thu Jan 16, 2020 11:24 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Quadratic
Replies: 10
Views: 30

Re: Quadratic

You should test each value, and rule out the one that is unreasonable in the situation. Usually you will end up with a positive and negative number, so it can immediately rule out.
by BritneyP- 2c
Thu Jan 16, 2020 11:22 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Factos effecting Equilibrium
Replies: 6
Views: 10

Re: Factos effecting Equilibrium

The factors that affect equilibrium are concentration, pressure based on Volume, and temperature.
by BritneyP- 2c
Wed Jan 15, 2020 10:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K units
Replies: 10
Views: 33

Re: K units

When you are looking for K is is molarity over molarity, which can cancel out all units. And if it doesn't cancel out all units, imagine the reactants changing to products or products changing to reactancts as activity, and activity is unitless.
by BritneyP- 2c
Wed Jan 15, 2020 10:43 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE Tables
Replies: 4
Views: 29

Re: ICE Tables

If it gives you the K and provides you either the initial values of molarity or moles, you will have to do the ice table so you can find the equilibrium concentration or moles. Remember to only stick with one, and convert if you have to.
by BritneyP- 2c
Wed Jan 08, 2020 11:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: solids/liquids
Replies: 4
Views: 19

Re: solids/liquids

solids are not considered because they don't have a concentration, they have density. Liquids do not affect the reactant amount at equilibrium, so they are not considered in the equilibrium constant.
by BritneyP- 2c
Wed Jan 08, 2020 11:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: units of K
Replies: 10
Views: 29

Re: units of K

K doesn't have units because because the products and reactants have the same units so they can cancel out. But if it doesn't cancel out, instead of thinking of concentration or partial pressure, consider transition of reactants to products as activity, which is unitless, so K is unitless
by BritneyP- 2c
Wed Jan 08, 2020 11:41 pm
Forum: Ideal Gases
Topic: Understanding Q
Replies: 19
Views: 67

Re: Understanding Q

Just solve Q the way you would for K. K is at equilibrium and Q is at any time.
by BritneyP- 2c
Wed Jan 08, 2020 11:39 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Aqueous Compounds
Replies: 3
Views: 9

Re: Aqueous Compounds

You can use the aqueous solution and also gases, but solids don't have a concentration so they cannot be used, and liquids cannot be used either.
by BritneyP- 2c
Wed Jan 08, 2020 11:38 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Direction
Replies: 5
Views: 35

Re: Reaction Direction

You use the Q to find whether the reaction is reactant favored or product favored. By using the concentrations of the compounds, if Q<K then it is reactant favored and the forward reaction is favored. If Q>K then it is product favored and the reverse reaction is favored.
by BritneyP- 2c
Thu Dec 05, 2019 10:19 pm
Forum: Bronsted Acids & Bases
Topic: Oxoacids
Replies: 1
Views: 16

Re: Oxoacids

Stablility makes it a stronger acid.
by BritneyP- 2c
Tue Dec 03, 2019 1:55 pm
Forum: Dipole Moments
Topic: Melting points
Replies: 15
Views: 101

Re: Melting points

intermolecular forces affect the melting point not the amount of bonds it has.
by BritneyP- 2c
Tue Dec 03, 2019 1:54 pm
Forum: Octet Exceptions
Topic: 2.27
Replies: 7
Views: 49

Re: 2.27

none of them are radicals.
by BritneyP- 2c
Tue Dec 03, 2019 1:53 pm
Forum: Hybridization
Topic: Triple Bond Hybridization
Replies: 4
Views: 15

Re: Triple Bond Hybridization

sp just demonstrates the amount of atoms around the central atom not the amount of bonds it has. There can be a unhybridized p orbital that is completely full to demonstrate the triple bond.
by BritneyP- 2c
Tue Dec 03, 2019 1:51 pm
Forum: Polyprotic Acids & Bases
Topic: Why is HClO4 stronger than H3PO4?
Replies: 3
Views: 34

Re: Why is HClO4 stronger than H3PO4?

HClO4 is stronger because Cl has a higher electronegativity than P and so the oxide is overall more stable. As a result of its stability, it is more acidic than H3PO4
by BritneyP- 2c
Tue Dec 03, 2019 1:48 pm
Forum: Naming
Topic: Oxidation Number
Replies: 3
Views: 21

Re: Oxidation Number

You need to know the charges of the other molecules and the charge of the overall molecule so that you can find the charge of the cation.
by BritneyP- 2c
Tue Dec 03, 2019 1:47 pm
Forum: Trends in The Periodic Table
Topic: Question
Replies: 17
Views: 138

Re: Question

Ionization energy is the energy it takes to remove and electron, while electronegativity is the attraction of the electron to the atom.
by BritneyP- 2c
Tue Dec 03, 2019 1:46 pm
Forum: Lewis Acids & Bases
Topic: diff b/w lewis acid and base
Replies: 12
Views: 81

Re: diff b/w lewis acid and base

A lewis acid is and electron acceptor and a lewis base is an electron donor
by BritneyP- 2c
Tue Dec 03, 2019 1:45 pm
Forum: Lewis Acids & Bases
Topic: Long bonds vs Short bonds?
Replies: 9
Views: 56

Re: Long bonds vs Short bonds?

Long bonds are weaker than short bonds because they have less attraction to each other in contrast with short bonds. The atoms are either larger in size or the electrons are repelling each other away making it easy to break the bonds.
by BritneyP- 2c
Tue Dec 03, 2019 1:43 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pKa vs Ka
Replies: 6
Views: 32

Re: pKa vs Ka

pKa is preferred because it is the log version of Ka, which is easier to compare than using Ka.
by BritneyP- 2c
Tue Dec 03, 2019 1:41 pm
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 5
Views: 32

Re: Naming Coordination Compounds

You don't have to memorize how to name them but you should know when to put the prefixes and when to change the metal cation into an -ate.
by BritneyP- 2c
Tue Dec 03, 2019 1:39 pm
Forum: Bond Lengths & Energies
Topic: Pi and Sigma Bonds and their affect on energy
Replies: 3
Views: 34

Re: Pi and Sigma Bonds and their affect on energy

In a pi bond the p orbitals overlap above and below the atom, localizing the electrons above and below the plane of the bond—a higher energy state compared to the overlap of a sigma bond. You can also conceptualize that pi bonds are weaker because their electrons are in a higher energy state.
by BritneyP- 2c
Tue Dec 03, 2019 1:37 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Tetrahedral vs. Square Planar
Replies: 1
Views: 15

Re: Tetrahedral vs. Square Planar

I don't think you will need to know that because with coordinate compounds you are just naming things out. But if you are asking about the ligands then you might need to
by BritneyP- 2c
Sun Nov 17, 2019 5:48 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Grading
Replies: 7
Views: 69

Re: Grading

He curves at the end of the year so we never know what the final grade is until after the final.
by BritneyP- 2c
Sun Nov 17, 2019 5:47 pm
Forum: Student Social/Study Group
Topic: test 2
Replies: 8
Views: 47

Re: test 2

It should be around 50 points according to the syllabus
by BritneyP- 2c
Sun Nov 17, 2019 5:45 pm
Forum: Coordinate Covalent Bonds
Topic: bond question
Replies: 5
Views: 73

Re: bond question

They do occur in nature if it requires less energy which is more favorable.
by BritneyP- 2c
Sun Nov 17, 2019 5:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 5
Views: 29

Re: VSEPR

Vsepr is just AXE, and you have to memorize the shapes each configuration makes bc it will be on test 2
by BritneyP- 2c
Sun Nov 17, 2019 5:42 pm
Forum: Hybridization
Topic: Lone Pair
Replies: 1
Views: 46

Re: Lone Pair

Look at the atom.
Count the number of atoms connected to it (atoms – not bonds!)
Count the number of lone pairs attached to it.
Add these two numbers together.
by BritneyP- 2c
Sun Nov 10, 2019 6:54 pm
Forum: Octet Exceptions
Topic: electron number in octet
Replies: 8
Views: 56

Re: electron number in octet

It depends on the molecule.
by BritneyP- 2c
Sun Nov 10, 2019 6:54 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: Surface Area
Replies: 2
Views: 16

Re: Surface Area

The increase of surface area increases the ability of individual molecules to attract each other. Branching in molecules decreases the surface area thereby decreasing the attractive force between individual molecules. As a result, the boiling point decreases.
by BritneyP- 2c
Sun Nov 10, 2019 6:52 pm
Forum: Hybridization
Topic: 2F.1
Replies: 2
Views: 34

Re: 2F.1

just say if it is 1/2 or -1/2
by BritneyP- 2c
Sun Nov 10, 2019 6:51 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: The exceptions
Replies: 6
Views: 63

Re: The exceptions

The 2 exceptions are copper and chromium
by BritneyP- 2c
Sun Nov 10, 2019 6:49 pm
Forum: Ionic & Covalent Bonds
Topic: Ionization Energy
Replies: 5
Views: 37

Re: Ionization Energy

ionization energy increases as it goes up and to the right. Up because the radius is much smaller so that the energy of removing an electron is higher and to the right because there are more protons to attract the electrons so the energy to remove an electron is much higher.
by BritneyP- 2c
Sun Nov 03, 2019 5:37 pm
Forum: Bond Lengths & Energies
Topic: Next Lecture
Replies: 3
Views: 27

Re: Next Lecture

Yea he is giving us past exam questions and we won't learn anything new.
by BritneyP- 2c
Sun Nov 03, 2019 5:36 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy Exceptions
Replies: 2
Views: 22

Re: Ionization Energy Exceptions

oxygen does not follow the trend and the noble gases.
by BritneyP- 2c
Sun Nov 03, 2019 5:32 pm
Forum: Coordinate Covalent Bonds
Topic: example of coordinate covalent bond
Replies: 2
Views: 24

Re: example of coordinate covalent bond

NH3 bonded to BF3
by BritneyP- 2c
Sun Nov 03, 2019 5:31 pm
Forum: Bond Lengths & Energies
Topic: Charge difference/dipole moment for the midterm
Replies: 1
Views: 17

Re: Charge difference/dipole moment for the midterm

You might have to but Dr. Lavelle never really mentioned it.
by BritneyP- 2c
Sat Nov 02, 2019 7:14 pm
Forum: Administrative Questions and Class Announcements
Topic: topics covered
Replies: 3
Views: 29

Re: topics covered

I don't think it is everything in chemical bonds because he said that one of the slides he covered will not be on the midterm but on final.
by BritneyP- 2c
Sun Oct 27, 2019 8:36 pm
Forum: Bond Lengths & Energies
Topic: bond lengths for single or double bonds
Replies: 7
Views: 32

Re: bond lengths for single or double bonds

double bonds are typically shorter than single bonds.
by BritneyP- 2c
Sun Oct 27, 2019 8:29 pm
Forum: Resonance Structures
Topic: Resonance Structures
Replies: 3
Views: 35

Re: Resonance Structures

Because the electrons could be shared among the other atoms so it resonates around
by BritneyP- 2c
Sun Oct 27, 2019 8:27 pm
Forum: Octet Exceptions
Topic: octet exceptions
Replies: 5
Views: 33

Re: octet exceptions

I just memorize them
by BritneyP- 2c
Sun Oct 27, 2019 8:27 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 5
Views: 28

Re: Drawing Lewis Structures

With lewis dot structures, you are dotting out the number of valence electrons you have for each element. With molecules you put the atom with the least amount of electronegativity in the middle and then all the others around it. Then you just have to count out the total electrons and make sure they...
by BritneyP- 2c
Sun Oct 27, 2019 8:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations (3d-orbital and 4s-orbital)
Replies: 2
Views: 18

Re: Electron Configurations (3d-orbital and 4s-orbital)

I think it is because the 3d orbitals have more energy to them so we fill the 4s orbitals first
by BritneyP- 2c
Sat Oct 19, 2019 2:15 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Question about last lecture
Replies: 4
Views: 27

Re: Question about last lecture

So, according to Pauli Exclusion Principle, it is better to fill up electron going in the same direction first as they would have lower energy potentials. So instead of filling up the 1px orbital completely, he added the other electron to the 1py orbital, as there is less energy.
by BritneyP- 2c
Sat Oct 19, 2019 2:12 pm
Forum: Quantum Numbers and The H-Atom
Topic: spin state (ms) quantum number
Replies: 2
Views: 32

Re: spin state (ms) quantum number

I don't think so, I think you have to just assume that when electrons are in the same orbital pattern, one is 1/2 and the other is -1/2. If they were going in the same direction, they would go against Hund's Law
by BritneyP- 2c
Sat Oct 19, 2019 2:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Coulomb's Law
Replies: 3
Views: 26

Re: Coulomb's Law

I think the reason why electron potential energies are higher the further they are from the nucleus is because if the atom loses the electron it would be more unstable. The fewer valence electron there are the more unstable they can become.
by BritneyP- 2c
Sat Oct 19, 2019 2:07 pm
Forum: Properties of Light
Topic: Quantum equations
Replies: 5
Views: 28

Re: Quantum equations

I think typically in the test they say what units o put the answer in but m/s is always safe.
by BritneyP- 2c
Sat Oct 19, 2019 2:05 pm
Forum: Properties of Light
Topic: Midterm Exam
Replies: 21
Views: 182

Re: Midterm Exam

The midterm should be everything from week one to chemical bonding
by BritneyP- 2c
Sun Oct 13, 2019 8:55 pm
Forum: Properties of Electrons
Topic: electron size
Replies: 3
Views: 22

Re: electron size

I don't know if we were given, but the mass of an electron is 9.109 x 10^-31 kg.
by BritneyP- 2c
Sun Oct 13, 2019 8:53 pm
Forum: Properties of Light
Topic: Photoelectric Effect
Replies: 1
Views: 16

Re: Photoelectric Effect

So light is a photon, which can move as both a particle and a wave. The particles individually move in a wave like motion, so I think you can consider them interchangeably.
by BritneyP- 2c
Sat Oct 12, 2019 4:47 pm
Forum: Properties of Electrons
Topic: Wave Properties of Electrons
Replies: 4
Views: 44

Re: Wave Properties of Electrons

The way I see it, small subatomic particles have a wave like property to them, which helps them move and repel around. As the object gets larger, they move less and have less of a wavelength property.
by BritneyP- 2c
Wed Oct 09, 2019 10:25 am
Forum: Limiting Reactant Calculations
Topic: Test 1
Replies: 11
Views: 160

Re: Test 1

For test one, it is all the fundamental things we did. You don't have to do all the homework problems but you should have a general idea of the concept. A lot of constants are provided for us so you should be fine if you do light studying.
by BritneyP- 2c
Wed Oct 09, 2019 10:20 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Calculating Energy per Photon
Replies: 3
Views: 27

Re: Calculating Energy per Photon

Because they already gave you the frequency, you can use E=Hf to find the energy, with h being planck's constant, and the frequency already being provided for.
by BritneyP- 2c
Thu Oct 03, 2019 9:31 pm
Forum: Significant Figures
Topic: quick sig fig question
Replies: 3
Views: 37

Re: quick sig fig question

the 0 after the decimal before the 7 is not significant, however the 0 after the 7 is
by BritneyP- 2c
Thu Oct 03, 2019 9:29 pm
Forum: Limiting Reactant Calculations
Topic: Calculating Theoretical Yield
Replies: 9
Views: 86

Re: Calculating Theoretical Yield

The theoretical yield should be the same as the limiting reactant, but remember that the theoretical yield will always be more than the actual yield due to outside factors such as solutions being stuck on the side of the beaker.
by BritneyP- 2c
Thu Oct 03, 2019 9:26 pm
Forum: SI Units, Unit Conversions
Topic: How to format homework
Replies: 9
Views: 108

Re: How to format homework

I just made sure to label each part of the problems and to put my name and id number on it. Also put a title on it and discussion section so that they know who you are and where to put your grade.
by BritneyP- 2c
Thu Oct 03, 2019 9:22 pm
Forum: Student Social/Study Group
Topic: Study Group Fall 2019
Replies: 32
Views: 1400

Re: Study Group Fall 2019

Yeah i might join if there is one! I am not the best at chemistry so it would be nice to hear other peoples understanding of the subject. Hopefully there will be a study group soon.
by BritneyP- 2c
Thu Oct 03, 2019 9:16 pm
Forum: SI Units, Unit Conversions
Topic: which unit to use
Replies: 9
Views: 129

Re: which unit to use

I think that if they don't give you a unit to convert to then just keep it the same. However, if they do give you something to convert to, then just stick with the moles of the converted element.
by BritneyP- 2c
Sat Sep 28, 2019 4:27 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Unit
Replies: 7
Views: 104

Re: Formula Unit

So I was reading through some online posts, but I think that formula units are only applied to salts such as NaCl. Molecular formulas are typically covalently bonded and so because salts like NaCl are ionic bonds they aren't molecules. I don't know if that helps but that is just what I think
by BritneyP- 2c
Sat Sep 28, 2019 4:26 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Unit
Replies: 7
Views: 104

Re: Formula Unit

So I was reading through some online posts, but I think that formula units are only applied to salts such as NaCl. Molecular formulas are typically covalently bonded and so because salts like NaCl are ionic bonds they aren't molecules. I don't know if that helps but that is just what I think

Go to advanced search