Search found 66 matches

by April Meza 3K
Fri Dec 06, 2019 2:21 am
Forum: Properties of Light
Topic: Light Absorbed/ emitted
Replies: 4
Views: 179

Re: Light Absorbed/ emitted

If there is a jump in energy levels then the light is absorbed. if there is a drop in energy levels then the light is emitted.
by April Meza 3K
Fri Dec 06, 2019 2:02 am
Forum: Amphoteric Compounds
Topic: Amphiprotic vs Amphoteric
Replies: 5
Views: 170

Re: Amphiprotic vs Amphoteric

Amphiprotic is losing and gaining an electron, while amphoteric is being able to act as an acid and base.
by April Meza 3K
Fri Dec 06, 2019 2:00 am
Forum: Octet Exceptions
Topic: Incomplete octets
Replies: 1
Views: 110

Re: Incomplete octets

Incomplete octets can be formed because there are certain atoms of certain elements that can exist in stable compounds, thus forming bonds with less than 8 valence electrons.
by April Meza 3K
Fri Dec 06, 2019 12:16 am
Forum: Significant Figures
Topic: Sig Figs on Tests
Replies: 24
Views: 1102

Re: Sig Figs on Tests

The answer should have the same number of sig figs as the number (of sig figs) in the question.
by April Meza 3K
Fri Dec 06, 2019 12:12 am
Forum: Hybridization
Topic: Determining Hybridization
Replies: 4
Views: 45

Re: Determining Hybridization

By determining the regions of electron density and then make orbitals with this number in mind.
by April Meza 3K
Sun Dec 01, 2019 8:13 pm
Forum: Lewis Acids & Bases
Topic: Proton acceptor and proton donor?
Replies: 33
Views: 370

Re: Proton acceptor and proton donor?

An acid donates a proton, while a base accepts a proton.
by April Meza 3K
Sun Dec 01, 2019 8:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma Bond
Replies: 10
Views: 114

Re: Sigma Bond

Single bonds are sigma bonds but they can also exist in double and triple bonds.
by April Meza 3K
Sun Dec 01, 2019 8:11 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Inorganic and organic
Replies: 3
Views: 44

Re: Inorganic and organic

Organic ones contain carbon, while inorganic ones do not contain carbon.
by April Meza 3K
Sun Dec 01, 2019 8:09 pm
Forum: Identifying Acidic & Basic Salts
Topic: Final: Strong/ Weak Acids/Bases
Replies: 11
Views: 913

Re: Final: Strong/ Weak Acids/Bases

I think its best if we know them. Just to be safe!
by April Meza 3K
Sun Dec 01, 2019 8:08 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Inorganic or Organic
Replies: 6
Views: 84

Re: Inorganic or Organic

Inorganic acids don to have carbon and organic acids do contain carbon.
by April Meza 3K
Sun Dec 01, 2019 8:06 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination Number
Replies: 4
Views: 50

Re: Coordination Number

Yes I think that the coordination number is the number of bonds on the central atom.
by April Meza 3K
Sun Nov 24, 2019 5:13 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 15
Views: 310

Re: Electronegativity

The higher the electronegativity the stronger the bond. When the bond is stronger is shorter.
by April Meza 3K
Sun Nov 24, 2019 4:58 pm
Forum: Student Social/Study Group
Topic: Test 2 and Final
Replies: 18
Views: 226

Re: Test 2 and Final

The final is cumulative and regarding test 2, I believe we'll be getting that back during discussion.
by April Meza 3K
Sun Nov 24, 2019 4:50 pm
Forum: Hybridization
Topic: Sigma and Pi bonds
Replies: 13
Views: 129

Re: Sigma and Pi bonds

I hope this is helpful! The two outer ones are pi bonds and the center one is a sigma bond.
by April Meza 3K
Sun Nov 24, 2019 4:44 pm
Forum: Resonance Structures
Topic: Resonance structures
Replies: 15
Views: 344

Re: Resonance structures

They are the various ways that a lewis structure can be drawn.
by April Meza 3K
Sun Nov 24, 2019 4:40 pm
Forum: Naming
Topic: Prefixes
Replies: 5
Views: 74

Re: Prefixes

They are used to determine the number of times a single ligand attaches to the central metal.
by April Meza 3K
Sun Nov 24, 2019 4:35 pm
Forum: Hybridization
Topic: Hybrid orbitals
Replies: 5
Views: 55

Re: Hybrid orbitals

You can find hybrid orbitals by looking at the lewis structure.
by April Meza 3K
Sun Nov 17, 2019 7:45 pm
Forum: Student Social/Study Group
Topic: What will Test 2 be on?
Replies: 8
Views: 143

Re: What will Test 2 be on?

I would look at outlines 3 and 4!
by April Meza 3K
Sun Nov 17, 2019 7:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 19
Views: 276

Re: Test 2

Drawing the lewis structure can be really helpful if you're not completely sure and want to be safe!
by April Meza 3K
Sun Nov 17, 2019 7:38 pm
Forum: Student Social/Study Group
Topic: Test 2 Topics
Replies: 3
Views: 68

Re: Test 2 Topics

All material that was not on the midterm and up until this point.
by April Meza 3K
Sun Nov 17, 2019 7:33 pm
Forum: Ionic & Covalent Bonds
Topic: Dipole-Dipole Interactions
Replies: 3
Views: 41

Re: Dipole-Dipole Interactions

Here is an example of a dipole-dipole moment.
by April Meza 3K
Sun Nov 17, 2019 7:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles for all VSEPR shapes?
Replies: 2
Views: 30

Re: Bond angles for all VSEPR shapes?

Yes, we need to know them.
by April Meza 3K
Sun Nov 10, 2019 8:12 pm
Forum: General Science Questions
Topic: London
Replies: 4
Views: 79

Re: London

London refers to London forces. It's an intermolecular force and the weakest.
by April Meza 3K
Sun Nov 10, 2019 8:08 pm
Forum: Dipole Moments
Topic: arrows for dipole moments
Replies: 3
Views: 38

Re: arrows for dipole moments

This is an example of a dipole moment. The arrow is pointing towards the atom with a partial negative charge.
by April Meza 3K
Sun Nov 10, 2019 8:00 pm
Forum: Electronegativity
Topic: Ionization energy and electronegativity
Replies: 8
Views: 99

Re: Ionization energy and electronegativity

Yes. The trends for ionization energy, electron affinity and electronegativity are the same.
by April Meza 3K
Sun Nov 10, 2019 7:57 pm
Forum: Bond Lengths & Energies
Topic: bond lengths
Replies: 3
Views: 40

Re: bond lengths

The length of a bond is determined by the number of bonded electrons. The higher the bond order then the stronger the pull between the two atoms and the shorter the bond length.
by April Meza 3K
Sun Nov 10, 2019 7:52 pm
Forum: Dipole Moments
Topic: Temporary Dipole Moment?
Replies: 4
Views: 41

Re: Temporary Dipole Moment?

Dipole moments are temporary as they are areas where an electron(s) can be found.
by April Meza 3K
Sun Nov 10, 2019 7:44 pm
Forum: Student Social/Study Group
Topic: Chemistry Youtube Channels
Replies: 8
Views: 140

Re: Chemistry Youtube Channels

Tyler DeWitt and Organic Chemistry Tutor are really great!
by April Meza 3K
Tue Nov 05, 2019 10:22 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers Question
Replies: 2
Views: 50

Re: Quantum Numbers Question

I believe it is 4 orbitals.
by April Meza 3K
Sun Nov 03, 2019 10:35 pm
Forum: *Shrodinger Equation
Topic: past exam questions session
Replies: 2
Views: 138

Re: past exam questions session

Ohh okay thank you so much!!
by April Meza 3K
Sun Nov 03, 2019 9:26 pm
Forum: *Shrodinger Equation
Topic: past exam questions session
Replies: 2
Views: 138

past exam questions session

Does anyone know if Dr. Lavelle's sessions tomorrow will all have the same past exam questions in all three sessions? Or will they be different in each session? Thanks in advance!
by April Meza 3K
Sun Nov 03, 2019 7:43 pm
Forum: Electronegativity
Topic: definitions
Replies: 8
Views: 119

Re: definitions

Electron affinity gives the amount of energy released when an atom gains an electron. The ionization energy is the amount of energy required to remove an electron from an atom.
by April Meza 3K
Sun Nov 03, 2019 7:40 pm
Forum: Significant Figures
Topic: Sig figs on midterm
Replies: 5
Views: 187

Re: Sig figs on midterm

We should base our sig figs based on the number of sig figs given in the question.
by April Meza 3K
Sun Nov 03, 2019 7:40 pm
Forum: Lewis Structures
Topic: Drawing Lewis Structures
Replies: 5
Views: 62

Re: Drawing Lewis Structures

Typically the structure with the most charges on the atoms closest to zero is the more stable lewis structure. Hope this makes sense!
by April Meza 3K
Sun Nov 03, 2019 7:37 pm
Forum: Bond Lengths & Energies
Topic: Bond Strength
Replies: 6
Views: 58

Re: Bond Strength

In shorter bonds, there is more electrons closer to the nucleus. This proximity makes it so you need more energy to brake the bond. This is why shorter bond lengths are stronger.
by April Meza 3K
Sun Nov 03, 2019 7:32 pm
Forum: Ionic & Covalent Bonds
Topic: Strength and Length
Replies: 18
Views: 219

Re: Strength and Length

The longer the bond length, the weaker the bond is and the shorter the bond length, the stronger the bond is.
by April Meza 3K
Sun Oct 27, 2019 11:06 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic Bonds confusion
Replies: 7
Views: 105

Re: Ionic Bonds confusion

I am pretty sure it is only from metal to nonmetal.
by April Meza 3K
Sun Oct 27, 2019 7:50 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 14
Views: 140

Re: Electronegativity

The way to know electronegativity is through the periodic table. Electronegativity increases as you move to the right and it decreases as you go down the periodic table.
by April Meza 3K
Sun Oct 27, 2019 7:47 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configurations
Replies: 3
Views: 38

Re: Electron configurations

The x, y, z are used to be more specific than the s,p,d,f orbitals. It helps categorize the electrons into their subsets in an orbital.
by April Meza 3K
Sun Oct 27, 2019 7:38 pm
Forum: Bond Lengths & Energies
Topic: Single bond vs double bond
Replies: 14
Views: 286

Re: Single bond vs double bond

I believe the numbers represent the length of the bonds. As for delocalized electrons, that means that electrons in a molecule are not associated with a single atom or covalent bond.
by April Meza 3K
Sun Oct 27, 2019 7:25 pm
Forum: Ionic & Covalent Bonds
Topic: Homework
Replies: 13
Views: 203

Homework

Is the next homework assignment only on the chemical bonds section?
by April Meza 3K
Thu Oct 24, 2019 11:16 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing homework
Replies: 2
Views: 39

Re: Accessing homework

Thank you so much!!!
by April Meza 3K
Thu Oct 24, 2019 11:10 pm
Forum: Administrative Questions and Class Announcements
Topic: Accessing homework
Replies: 2
Views: 39

Accessing homework

Can someone share the password that we need to use in order to access the class website? Please and thank you!
by April Meza 3K
Sun Oct 20, 2019 11:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: d block
Replies: 2
Views: 30

d block

Can someone explain the importance of the d-block when doing electron configurations? Please and thank you!
by April Meza 3K
Sun Oct 20, 2019 10:52 pm
Forum: *Shrodinger Equation
Topic: Schrodinger equation
Replies: 4
Views: 69

Schrodinger equation

Can someone explain the Schrodinger equation and how to know when we need to use it?
by April Meza 3K
Sun Oct 20, 2019 10:34 pm
Forum: *Black Body Radiation
Topic: What is it?
Replies: 6
Views: 226

Re: What is it?

He said that we were not going to cover black bodies so I wouldn't worry about it.
by April Meza 3K
Sun Oct 20, 2019 10:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Chem revision help
Replies: 2
Views: 31

Re: Chem revision help

Crash course videos, the organic chem tutor, and Tyler DeWitt are some good channels. They are straight forward and really helpful!
by April Meza 3K
Thu Oct 17, 2019 10:51 pm
Forum: Properties of Light
Topic: Homework 1B. 15
Replies: 2
Views: 38

Homework 1B. 15

The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 3 103 km.s2^-1. (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50 3 1016 Hz. How much energy is requir...
by April Meza 3K
Sun Oct 13, 2019 8:44 pm
Forum: Properties of Light
Topic: Quick question on equations
Replies: 5
Views: 49

Re: Quick question on equations

I'm sure that if we are given the equations we are then expected to know what the variables mean and how to use them to solve the problems.
by April Meza 3K
Sun Oct 13, 2019 8:08 pm
Forum: Properties of Light
Topic: 1F.5
Replies: 1
Views: 18

1F.5

State the hybridization of the atom in boldface red type in
each of the following molecules and ions: (a) Be Cl 2 ; (b) B H 3 ; (c) B H 42 ; (d) Si F 4 .

Can someone explain how I would complete this? Thanks!
by April Meza 3K
Sat Oct 12, 2019 8:15 pm
Forum: Properties of Light
Topic: Wave Properties of electrons
Replies: 7
Views: 111

Wave Properties of electrons

In the wave of properties of electrons Lecture diffraction was mentioned. Dr. Lavelle mentioned that light waves in general show diffraction patterns. I am confused as to what exactly diffraction patterns are. Can someone please explain? Thanks!
by April Meza 3K
Sat Oct 12, 2019 7:58 pm
Forum: Properties of Light
Topic: Homework 1B.9
Replies: 3
Views: 68

Re: Homework 1B.9

Thank you!
by April Meza 3K
Sat Oct 12, 2019 6:52 pm
Forum: Properties of Light
Topic: Homework 1B.9
Replies: 3
Views: 68

Homework 1B.9

A lamp rated at 32 W (1 W 5 1 J*s) 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 some explain how I would approach this question? Thanks!
by April Meza 3K
Sat Oct 12, 2019 6:33 pm
Forum: SI Units, Unit Conversions
Topic: Weekly Posts
Replies: 7
Views: 111

Weekly Posts

Do we have to have the 5 posts by today or if we post Sunday will they still be counted?
by April Meza 3K
Fri Oct 11, 2019 12:11 am
Forum: Molarity, Solutions, Dilutions
Topic: Homework L7
Replies: 4
Views: 292

Re: Homework L7

Thank you, these are really helpful!
by April Meza 3K
Thu Oct 10, 2019 11:16 pm
Forum: Molarity, Solutions, Dilutions
Topic: Homework L7
Replies: 4
Views: 292

Homework L7

The camel stores the fat tristearin, C 57 H 110 O 6, in its hump. As well as being a source of energy, the fat is also a source of water because, when it is used, the reaction 2 C57H110O6(s) + 163 O2(g)---> S 114 CO2(g) + 110 H2O(l) takes place. (a) What mass of water is available from 1.00 pound (4...
by April Meza 3K
Thu Oct 03, 2019 10:12 pm
Forum: SI Units, Unit Conversions
Topic: Homework
Replies: 9
Views: 210

Homework

Does anyone know if we're supposed to write our homework in pen? Or is that just for tests?
by April Meza 3K
Thu Oct 03, 2019 9:42 pm
Forum: Balancing Chemical Reactions
Topic: H.5
Replies: 2
Views: 73

H.5

(b) Mg(N3)2(s) + H2O(l) ---> Mg(OH)2(aq) + HN3(aq)

Can someone explain how to balance this equation? I get stuck after a few steps. Thanks!
by April Meza 3K
Thu Oct 03, 2019 9:20 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: HW E. 1
Replies: 3
Views: 98

Re: HW E. 1

Since the diameter is twice the radius, 144pm (the radius that is given) is multiplied by 2. That would be 288pm.
by April Meza 3K
Thu Oct 03, 2019 8:57 pm
Forum: SI Units, Unit Conversions
Topic: E.9
Replies: 2
Views: 68

Re: E.9

Thank you! This really helps!
by April Meza 3K
Thu Oct 03, 2019 8:56 pm
Forum: Limiting Reactant Calculations
Topic: Study Strategies/Youtube Videos
Replies: 14
Views: 266

Re: Study Strategies/Youtube Videos

I really like the way topics are explained on KhanAcademy and crash course! They are straight forward and after a few videos, they give examples for you to do.
by April Meza 3K
Thu Oct 03, 2019 8:10 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Rounding
Replies: 12
Views: 339

Re: Rounding

Abbey Brandt 4E wrote:The best rule I can give you is to use the least specific number of sig figs used in the question itself. For example, if in the equation there are measurements including the digits 4.98, 5.667, and 0.2, you would use 1 significant figure. Does that help?


Yes, it does. Thanks!
by April Meza 3K
Thu Oct 03, 2019 7:48 pm
Forum: SI Units, Unit Conversions
Topic: E.9
Replies: 2
Views: 68

E.9

Epsom salts consist of magnesium sulfate heptahydrate. Write its formula. (a) How many atoms of oxygen are in 5.15 g of Epsom salts? (b) How many formula units of the compound are present in 5.15 g? (c) How many moles of water molecules are in 5.15 g of Epsom salts? I am not sure how to go about thi...
by April Meza 3K
Thu Oct 03, 2019 7:33 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Rounding
Replies: 12
Views: 339

Re: Rounding

Okay, thank you!
by April Meza 3K
Thu Oct 03, 2019 7:27 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Rounding
Replies: 12
Views: 339

Rounding

How do I know when I need to round? For instance, if I were to use Lithium, which is 6.94, would it be that exact number or can I round to 7?

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