Search found 40 matches

by Lara Kristine Bacasen 3B
Mon Nov 11, 2019 7:37 pm
Forum: Student Social/Study Group
Topic: Chem 14B
Replies: 10
Views: 48

Re: Chem 14B

I'm taking the class. I asked my sister about taking the lab (she attends the school) and she recommends to hold of on taking the lab till you're done with the 14b class. She said latter on it's actually a struggle to take classes you like if you pack your classes early on. Also if you're taking a c...
by Lara Kristine Bacasen 3B
Mon Nov 11, 2019 7:32 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Test Policy
Replies: 6
Views: 38

Re: Test Policy

I did the brackets around the molecule to indicate charge. But I also did the formal charge calculations of each atom and listed them next to each individual atom to make sure.
by Lara Kristine Bacasen 3B
Mon Nov 11, 2019 7:30 pm
Forum: Ionic & Covalent Bonds
Topic: Homework for week 7
Replies: 5
Views: 26

Re: Homework for week 7

I believe it's still valid to do these problems since he was talking about it during the previous lectures recently. At least I did the problems for 2D.
by Lara Kristine Bacasen 3B
Mon Nov 11, 2019 7:28 pm
Forum: Electronegativity
Topic: Formula for Difference
Replies: 7
Views: 21

Re: Formula for Difference

He said we didn't need to. We should know the general trends like how bond is most likely ionic if the difference in electronegativity between the two is greater than 2. For covalent, less than 1.5 I believe. Just remember that depending on the bonded pair the bond can be more covalent or ionic. I s...
by Lara Kristine Bacasen 3B
Mon Nov 11, 2019 7:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Memorization Tips
Replies: 3
Views: 20

Re: Memorization Tips

I'm not sure how strict they are gonna be if they are gonna ask about angles. I think they are gonna ask just for what shape is called and why arises. Maybe give you a molecule and ask what shape it takes and why. My best suggestion is practice problems and flashcards/quizlet.
by Lara Kristine Bacasen 3B
Wed Nov 06, 2019 11:05 pm
Forum: Dipole Moments
Topic: Dipole Moment Changing
Replies: 3
Views: 26

Re: Dipole Moment Changing

I agree, if the molecule is the same the sharing of electrons should be the same and will induce a partial charge due to their electronegativity.
by Lara Kristine Bacasen 3B
Wed Nov 06, 2019 11:02 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbitals past f
Replies: 2
Views: 20

Re: orbitals past f

Yeah, the only orbitals are s, p, d, and f. We can also see this visibly in the periodic table.
by Lara Kristine Bacasen 3B
Wed Nov 06, 2019 11:00 pm
Forum: Dipole Moments
Topic: Dipole moments
Replies: 5
Views: 38

Re: Dipole moments

To add on, how I understand it is that one atom is more greedy than the other. One of the atoms needs the electron more than the other and this causes it to pull the electron closer to itself and farther from the other atom it is getting the electron from. This induces a partial charge, a negative c...
by Lara Kristine Bacasen 3B
Wed Nov 06, 2019 10:54 pm
Forum: Dipole Moments
Topic: Ionic bonds
Replies: 5
Views: 19

Re: Ionic bonds

Yes, sometimes one of the atoms need the electron more than the other and it creates a partial charge among the atoms.
by Lara Kristine Bacasen 3B
Tue Nov 05, 2019 11:40 pm
Forum: Ionic & Covalent Bonds
Topic: Correcting Ionic Model
Replies: 4
Views: 46

Correcting Ionic Model

So when it says all ionic bonds have some covalent character it is just talking about how covalent bonds are less soluble right? And the higher the distortions/polarization the more covalent character means it becomes less soluble compared to other salts?
by Lara Kristine Bacasen 3B
Wed Oct 30, 2019 12:15 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 4
Views: 25

Re: Midterm

It should be since we are going over them. The midterm is up to Concept 2D in the textbook which is Properties of Bonds.
by Lara Kristine Bacasen 3B
Wed Oct 30, 2019 11:28 am
Forum: Ionic & Covalent Bonds
Topic: Ionic Bonds
Replies: 6
Views: 30

Re: Ionic Bonds

You usually see it with nonmetals and metals as they exchange elections. Usually the nonmetals take elections from the metals so both can become more stable.
by Lara Kristine Bacasen 3B
Tue Oct 29, 2019 9:17 pm
Forum: Lewis Structures
Topic: Lewis Structure structure
Replies: 4
Views: 18

Re: Lewis Structure structure

I believe they bend away from each other because as the atoms are connected together in the molecule they continue to interact. Meaning, the non-central atoms of the molecule are trying to stay away from each other/ repel each other making the structure more angular. He used water as an example in l...
by Lara Kristine Bacasen 3B
Tue Oct 29, 2019 9:04 pm
Forum: General Science Questions
Topic: Midterm 1
Replies: 2
Views: 33

Re: Midterm 1

Everything that will be on the midterm will be from the first lecture to the lecture on Friday. So fundamentals to Chapter 2D.
by Lara Kristine Bacasen 3B
Tue Oct 29, 2019 9:02 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 16
Views: 67

Re: Midterm

Yes, everything from the beginning to 2D in the text book will be on the test.
by Lara Kristine Bacasen 3B
Fri Oct 25, 2019 4:37 pm
Forum: Administrative Questions and Class Announcements
Topic: Powerpoint Slides
Replies: 5
Views: 34

Re: Powerpoint Slides

Nope we don't sadly. It's good to make a friend so you can get notes or at least the topics of what was in lecture. You can also go to the study programs he offers to catchup.
by Lara Kristine Bacasen 3B
Fri Oct 25, 2019 4:25 pm
Forum: Lewis Structures
Topic: Video Modules
Replies: 11
Views: 63

Re: Video Modules

He hasn't said anything about uploading any new ones. You should email him. Or he will eventually see this.
by Lara Kristine Bacasen 3B
Mon Oct 21, 2019 11:00 pm
Forum: Trends in The Periodic Table
Topic: Metals, Nonmetals, Metalloids
Replies: 5
Views: 25

Re: Metals, Nonmetals, Metalloids

When interpreting some chemical reactions it would be good to know which one is which because it tells you what types of bonds are formed or what their properties are. The periodic table is organized in a way where you would know which is a metal, nonmetal, or metalloid. The metalloids are kinds pos...
by Lara Kristine Bacasen 3B
Mon Oct 21, 2019 10:05 pm
Forum: Administrative Questions and Class Announcements
Topic: Where to find what material you missed if you missed a class?
Replies: 4
Views: 22

Re: Where to find what material you missed if you missed a class?

Generally no, you should try find someone who can tell you the topics and try to read through what he went over. Like today Lavelle went over trends. Online there are documents that tells you the main topics we should understand. The video modules also help. If you still don't understand after tryin...
by Lara Kristine Bacasen 3B
Mon Oct 21, 2019 9:45 pm
Forum: Trends in The Periodic Table
Topic: Isotopes
Replies: 2
Views: 22

Re: Isotopes

Yes that is correct but is that the correct question for 1B-3?
by Lara Kristine Bacasen 3B
Sat Oct 19, 2019 9:32 pm
Forum: *Black Body Radiation
Topic: General Question about this
Replies: 2
Views: 28

Re: General Question about this

I believe it is under Atomic spectra. My notes says e- in atoms (and molecules) also absorb/emit quanta of energy which gives atomic (and molecular spectra. Atoms and molecules only absorb or emit unique frequencies that are allowed by their unique electronic structure. The exception is 'black bodie...
by Lara Kristine Bacasen 3B
Sat Oct 19, 2019 9:24 pm
Forum: Properties of Electrons
Topic: mass of electron, proton, neutron
Replies: 7
Views: 39

Re: mass of electron, proton, neutron

Don't think so. They are probably on the equations sheet or given. When you're trying to predict something thought, just remember that the electron is the lightest out of the three for the masses or essentially the electron doesn't influence mass of an atom.
by Lara Kristine Bacasen 3B
Sat Oct 19, 2019 6:40 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: E configuration of ions
Replies: 2
Views: 15

Re: E configuration of ions

So in lecture he used cation as an example. Cations are positive charged atoms because an e- is removed. The configuration is the same except a e- on the furthest/weakest orbital is removed. For anions you add an election to the furthest orbital.
by Lara Kristine Bacasen 3B
Sat Oct 19, 2019 5:48 pm
Forum: General Science Questions
Topic: Midterm
Replies: 3
Views: 37

Re: Midterm

Like he says, there is always step up programs, office hours, etc. He has loads of resources like physical visits and videos online you can do to review on your own time. They said some of the homework problems are on tests but I'm not sure if they are on the midterms. However, constant practice wit...
by Lara Kristine Bacasen 3B
Sat Oct 19, 2019 5:41 pm
Forum: Properties of Light
Topic: Next test
Replies: 23
Views: 146

Re: Next test

The Equation sheet is always given I believe. The same one that they gave us on the first test is on the website under the title constants and equations.
by Lara Kristine Bacasen 3B
Sun Oct 13, 2019 12:53 am
Forum: Administrative Questions and Class Announcements
Topic: How to check how many points I have this week for posting on Chemistry Community?
Replies: 11
Views: 58

Re: How to check how many points I have this week for posting on Chemistry Community?

I'm not sure myself. I think you should be able to ask your RA since they are recording their section's activity. But it's best for you to keep track of how many posts you have. Usually it says it under your name how many posts you made whether it be a question or comment. But sometime it adds one t...
by Lara Kristine Bacasen 3B
Sun Oct 13, 2019 12:40 am
Forum: Photoelectric Effect
Topic: threshold energy
Replies: 6
Views: 20

Re: threshold energy

Another way of thinking of the thresh hold energy is hearing. We can only hear something if it reaches a certain amount of Hz, any thing lower than that amount we can't hear it (of course there is also too high we wouldn't be able to hear it but that is beside the point). Also like moving a heavy ob...
by Lara Kristine Bacasen 3B
Sun Oct 13, 2019 12:27 am
Forum: Einstein Equation
Topic: Numbers to memorize [ENDORSED]
Replies: 37
Views: 987

Re: Numbers to memorize [ENDORSED]

Agree with everyone. They are kind enough to provide the equations and constants for us and it is easier to memorize them so you don't have to look over it constantly. But really you should make sure how to use the constants and equations. The equations will show the variables but not what they repr...
by Lara Kristine Bacasen 3B
Sun Oct 13, 2019 12:18 am
Forum: Properties of Light
Topic: Speed of Light
Replies: 41
Views: 776

Re: Speed of Light

C is a constant but of course although it is widely accepted this constant assumes particular conditions like how light particles has no resting mass. There is also quantum field theory that argues the vacuum isn't always empty and has elementary particles that pop in and out if existence which can ...
by Lara Kristine Bacasen 3B
Sun Oct 13, 2019 12:01 am
Forum: Properties of Light
Topic: e=hv
Replies: 7
Views: 38

Re: e=hv

The variable E denotes that a photon/energy particle of light is proportional to its frequency (v). Variable h relates the energy in one photon of electromagnetic radiation to the frequency of that radiation. It links the particle's frequency with its energy. So essentially, I believe that this equa...
by Lara Kristine Bacasen 3B
Thu Oct 03, 2019 10:00 pm
Forum: Balancing Chemical Reactions
Topic: H.5
Replies: 2
Views: 39

Re: H.5

If you really have trouble balancing it out I suggest you try writing out what elements are there and counting out what is on each side and have a side by side comparison of the elements on the product and reactant side. That is what I did when starting out. You should first try to look at the combi...
by Lara Kristine Bacasen 3B
Thu Oct 03, 2019 9:42 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Question on F.1 Part B
Replies: 3
Views: 31

Re: Question on F.1 Part B

So for part b you are only trying to find the mass composition of the individual elements so use the masses of the individual elements (so the mass of all the Carbons, Hydrogens, and Oxygens that make up the molecule) and divide them each by the Molar Mass of the whole molecule to get the percentage...
by Lara Kristine Bacasen 3B
Thu Oct 03, 2019 9:38 pm
Forum: Molarity, Solutions, Dilutions
Topic: F.3 part b
Replies: 3
Views: 15

Re: F.3 part b

Okay so for this one you know the what the molecule of nitric acid is composed of HNO3. When you look at it think about how many atoms there are of each element and try to think of their individual masses as well. H is the lightest so it shouldn't have the largest mass composition. Now look at N and...
by Lara Kristine Bacasen 3B
Thu Oct 03, 2019 9:31 pm
Forum: Significant Figures
Topic: Sig Figs of Mass Percentage Composition?
Replies: 3
Views: 34

Re: Sig Figs of Mass Percentage Composition?

So in this situation I believe you should do at least four significant figures just to be safe. At lease that is what I did. But as long as the mass percentages added up to 100% I believe you will be fine.
by Lara Kristine Bacasen 3B
Thu Oct 03, 2019 9:27 pm
Forum: Limiting Reactant Calculations
Topic: Calculating Theoretical Yield
Replies: 9
Views: 73

Re: Calculating Theoretical Yield

Yes, the limiting reactant is the thing that limits the yield so all of it will be used while the other reactant is in excess. In calculating the theoretical yield you also need to look at the molar ratios to determine how much the theoretical yield should be for the reaction. Hope this helps.
by Lara Kristine Bacasen 3B
Thu Oct 03, 2019 7:17 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Fundamental E 17
Replies: 2
Views: 33

Re: Fundamental E 17

Yes, you are correct. Looking at the equation that you use for this problem it is N=nNA (N means number of atoms of the element, n = moles of element, NA Avogadro's constant). If you plug in the unknowns you essentially plug in the same things so the outcome should be the same answer.
by Lara Kristine Bacasen 3B
Thu Oct 03, 2019 7:12 pm
Forum: SI Units, Unit Conversions
Topic: Mass % comp accuracy F5
Replies: 5
Views: 64

Mass % comp accuracy F5

Alright so I was doing F5 and when I did the percentages I got values different from the solutions manual but they still result to 100% when added together. I know how to do it but I think there is a difference because of the masses I'm using for the individual atoms and molar mass. Do you think it ...
by Lara Kristine Bacasen 3B
Thu Oct 03, 2019 7:03 pm
Forum: Balancing Chemical Reactions
Topic: Understanding how to get whole #s [ENDORSED]
Replies: 18
Views: 130

Re: Understanding how to get whole #s [ENDORSED]

It depends on what you are trying to solve for. If you have a step beyond getting the moles you shouldn't round but if you don't then I would leave it as it is. I believe it is up to the person to decide if they want to leave it as is.
by Lara Kristine Bacasen 3B
Thu Oct 03, 2019 6:58 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: mol-1?
Replies: 5
Views: 51

Re: mol-1?

Well, they both mean the same thing so they should be fine. I think it only matters if you know that g*mol^-1 is the same as g/mol because the book uses this notation a lot as opposed to g/mol.
by Lara Kristine Bacasen 3B
Wed Oct 02, 2019 9:28 pm
Forum: SI Units, Unit Conversions
Topic: Fundamentals E Question E.1
Replies: 3
Views: 27

Re: Fundamentals E Question E.1

Okay so first of, you are right that it doesn't specifically ask for a certain unit so technically you can leave it as pm. However, the solutions manual gives the answer in "m"/meters which is Fundamental/base unit but it also converts it to "km" which confuses me. So I believe a...

Go to advanced search