Search found 64 matches

by Lindsey Chheng 1E
Tue Jan 14, 2020 9:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acids and Bases
Replies: 3
Views: 27

Acids and Bases

During lecture, Lavelle said that K does not change when an acid or base is added and that even though [H3O+] > [OH-] or vice versa, the product of them would still be equal to 1.0 x 10^-14. Why is this? I understand that Kw = 1.0 x 10^-14, but if an acid or base is added to water, wouldn't it not b...
by Lindsey Chheng 1E
Tue Jan 14, 2020 9:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acids and Bases
Replies: 6
Views: 27

Re: Acids and Bases

Are all acid and base reactions at equilibrium? For weak acids and bases, we usually write their reactions with equilibrium arrows, but for strong acids and bases we usually write their equations with a single arrow pointing forward to indicate that the strong acid completely dissociates. However, ...
by Lindsey Chheng 1E
Tue Jan 14, 2020 9:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid and Base Equilibrium
Replies: 2
Views: 16

Re: Acid and Base Equilibrium

Will we have to know how to work with acids and bases at equilibrium? If so, is there anything that makes them different when it comes to ICE tables and other calculations we have been doing with regular equations? According to the syllabus, we're going to have to know how to solve problems with ac...
by Lindsey Chheng 1E
Tue Jan 14, 2020 8:56 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium constants table
Replies: 4
Views: 18

Re: Equilibrium constants table

how do we know which equilibrium constant of the three per equation column (the ones decreasing in value) to use? for example in the Kc column for H2+I2--> 2HI do we use 794, 160, or 54? thanks so much! You would have to look at the given temperature in the problem as well as if the compounds are g...
by Lindsey Chheng 1E
Tue Jan 14, 2020 8:51 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Homework 5J.1
Replies: 4
Views: 15

Homework 5J.1

Consider the equilibrium CO(g) + H2O(g) ⇌ CO2(g) + H2(g).
a) If the partial pressure of CO2 is increased, what happens to the partial pressure of H2?

I think that the partial pressure of H2 will decrease from the reaction shifting left to re-establish equilibrium. Is this correct?
by Lindsey Chheng 1E
Mon Jan 06, 2020 9:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Very Large K
Replies: 12
Views: 64

Very Large K

what does it mean when K is a very large value and not just simply >1 but more like >>>>>1?
by Lindsey Chheng 1E
Mon Jan 06, 2020 9:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium constant v. Reaction quotient
Replies: 3
Views: 27

Re: Equilibrium constant v. Reaction quotient

What exactly is the difference between an equilibrium constant and a reaction quotient? The textbook said that the reaction quotient can be used for any stage of the reaction, and it accounts for free energy, but I am confused as to how exactly it does this. K is a ratio solved with values at equil...
by Lindsey Chheng 1E
Mon Jan 06, 2020 9:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Hw Problem G2
Replies: 5
Views: 49

Re: Hw Problem G2

I think the answer is true because K will always be the same ratio no matter what you start with, as long as the reaction is kept under the same conditions.
by Lindsey Chheng 1E
Mon Jan 06, 2020 9:11 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant
Replies: 4
Views: 24

Equilibrium Constant

What did Lavelle say was the reason that there are no units for K?
by Lindsey Chheng 1E
Mon Jan 06, 2020 9:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Heterogeneous Equilibria
Replies: 2
Views: 24

Re: Heterogeneous Equilibria

For a heterogeneous equilibrium, what expression is utilized to find the equilibrium constant? K is always equal to [Products]/[Reactants]. Heterogeneous Equilibria just means that at least one of the components in the reaction, whether it be a reactant or a product, is in a different phase (gas, l...
by Lindsey Chheng 1E
Thu Dec 05, 2019 7:33 pm
Forum: Bronsted Acids & Bases
Topic: Neutral/Negatively Charged Acid
Replies: 1
Views: 21

Neutral/Negatively Charged Acid

what does it mean when an acid is neutral or negatively charged?
by Lindsey Chheng 1E
Thu Dec 05, 2019 7:29 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acidity and Resonance/Delocalization
Replies: 1
Views: 21

Acidity and Resonance/Delocalization

Can someone please explain how resonance, delocalization, and stabilizing of negative charges contribute to the strength of an acid?
by Lindsey Chheng 1E
Thu Dec 05, 2019 7:25 pm
Forum: Naming
Topic: Using bis-, tris-, tetrakis-, pentakis-
Replies: 2
Views: 33

Using bis-, tris-, tetrakis-, pentakis-

Can someone give examples of how we would change the naming of a ligand that has di, tri, and tetra- or is a polydentate to its name that has bis-, tris-, tetrakis-, or pentakis-?
by Lindsey Chheng 1E
Thu Dec 05, 2019 7:16 pm
Forum: Electronegativity
Topic: Ion Size
Replies: 2
Views: 27

Re: Ion Size

Is Mg+2 bigger or smaller than Na+? Is O-2 bigger or smaller than N-3? Arrange the anions Cl- , Br- , N-3, and O-2 in order of increasing polarizability and give reasons for your decisions. Thanks! Mg2+ is smaller than Na+ because two cations have the same amount of electrons but Mg has one more pr...
by Lindsey Chheng 1E
Thu Dec 05, 2019 6:39 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: electronegativity
Replies: 1
Views: 20

Re: electronegativity

how does the difference in electronegativity contribute to the strength of an acid? When comparing the strength of these acids (HF, HCl, HBr, and HI), what difference in electronegativity is crucial in telling us how strong the bond is between Hydrogen and the respective halogen. Since F has the hi...
by Lindsey Chheng 1E
Tue Nov 26, 2019 12:10 am
Forum: Bronsted Acids & Bases
Topic: Equlibrium Constant Expression for Strong Acids/Bases
Replies: 3
Views: 15

Equlibrium Constant Expression for Strong Acids/Bases

Why do Ka and Kb not exist for strong acids/bases?
by Lindsey Chheng 1E
Tue Nov 26, 2019 12:06 am
Forum: Bronsted Acids & Bases
Topic: Lewis Structures of Acid/Base reactions
Replies: 3
Views: 22

Lewis Structures of Acid/Base reactions

Is it possible we will be asked to draw out the lewis structures of equations like HCl + H2O --> H3O+ + Cl- on the test?
by Lindsey Chheng 1E
Mon Nov 25, 2019 11:52 pm
Forum: Lewis Acids & Bases
Topic: When is an acid considered Bronsted?
Replies: 9
Views: 59

Re: When is an acid considered Bronsted?

What makes them different The Bronsted-Lowry definition of acids and bases are focused on the proton (H+). Bronsted Acids are proton (H+) donors and Bronsted Bases are the proton (H+) acceptors. My high school chemistry teacher used the phrase "shake and take", where acids "shake&quo...
by Lindsey Chheng 1E
Mon Nov 25, 2019 11:38 pm
Forum: Bronsted Acids & Bases
Topic: J.1
Replies: 3
Views: 31

Re: J.1

Identify each compound as either a Brønsted acid or a Brønsted base: (a) NH3 ; (b) HBr; (c) KOH; (d) H2SO3 ; (e) Ca(OH)2 . Is there a strategy for identifying each compound as a Bronsted acid/base? I think you just have to already know which compounds are acids or bases. The compounds in this quest...
by Lindsey Chheng 1E
Mon Nov 25, 2019 11:29 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Transition Metals
Replies: 4
Views: 34

Re: Transition Metals

JChen_3C wrote:Can coordination compounds only be made with transition metals? Or can other metals act as the central metal atom?

aluminum, silver, gold and platinum also form coordination compounds
by Lindsey Chheng 1E
Fri Nov 22, 2019 9:26 pm
Forum: Naming
Topic: Diethylenetriamine naming example
Replies: 1
Views: 26

Diethylenetriamine naming example

What was the alternate way of naming Diethylenetriamine with the prefix bis-?
by Lindsey Chheng 1E
Fri Nov 22, 2019 9:19 pm
Forum: Biological Examples
Topic: Heme Complex
Replies: 5
Views: 42

Heme Complex

Is Fe always at the center of a Heme Complex? I feel like he went into a lot of detail about the Heme Complex today. Will we have to know it in as much depth as he went over?
by Lindsey Chheng 1E
Fri Nov 22, 2019 9:16 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acids
Replies: 2
Views: 16

Bronsted Acids

Are the weak acids we talked about in class today (carbonic acid and benzoic acid) also bronsted acids?
by Lindsey Chheng 1E
Fri Nov 22, 2019 8:38 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Definition of a Ligand
Replies: 4
Views: 21

Re: Definition of a Ligand

Ligands must fit two criteria:
a. must have a neutral or negative charge
b. must have at least one pair to donate
by Lindsey Chheng 1E
Fri Nov 22, 2019 8:27 pm
Forum: Lewis Acids & Bases
Topic: Hydronium ion
Replies: 5
Views: 39

Re: Hydronium ion

NicoJones_1B wrote:When H2O becomes H3O, where does the oxygen pick up a hydrogen? Does it take it from a nearby oxygen?

The reaction we did in class was HCl + H2O --> H3O+ + Cl-
The extra H comes from the HCl since HCl dissociates in H2O.
by Lindsey Chheng 1E
Wed Nov 13, 2019 5:52 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: HW 3F.15
Replies: 2
Views: 32

Re: HW 3F.15

Can someone please explain why AsF3 has a boiling point of 63C while AsF5 has a boiling point of -53C? Since AsF3 has a lone pair in its structure, it has a net dipole moment and exhibits polar characteristics. Meanwhile, AsF5 has no net dipole moment and is nonpolar. Therefore, it will take more e...
by Lindsey Chheng 1E
Wed Nov 13, 2019 5:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Exam 2
Replies: 3
Views: 40

Re: Exam 2

KBELTRAMI_4I wrote:does it include the midterm topics?

I think it would be too much for Lavelle to include past midterm topics on the next test; the next time we'll be tested on them will probably be on the final.
by Lindsey Chheng 1E
Wed Nov 13, 2019 1:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: molecular shape
Replies: 8
Views: 47

Re: molecular shape

Based on the lewis structure, how are we able to determine the molecular shape since the lewis structure is only 2-D? To determine molecular shape, you have to take into account the steric number (# bonding regions + lone pairs) and the number of lone pairs. Determining the name of the molecular sh...
by Lindsey Chheng 1E
Wed Nov 13, 2019 1:44 pm
Forum: DeBroglie Equation
Topic: wavelength to remove an electron
Replies: 3
Views: 46

Re: wavelength to remove an electron

How would you calculate the longest wavelength of light that can remove an electron when given the work function? The longest wavelength of light would correlate to the least amount of energy a photon has to be in order to eject an electron from a metal surface, which means it would be equivalent t...
by Lindsey Chheng 1E
Wed Nov 13, 2019 1:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Bond and Regions
Replies: 2
Views: 25

Re: VSEPR Bond and Regions

Why are double and tripe bonding pairs still considered a single region of electron density and not affect the shape/bond angles? I'm confused because I thought if you had more electrons there would be a greater repulsion, so it would affect the shape and the bond angles. Thank you! I think it's be...
by Lindsey Chheng 1E
Thu Nov 07, 2019 11:59 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 8
Views: 44

Re: Bond Lengths

What is the explanation behind why single bonds have longer bond lengths than double and triple bonds? In single bonds, only 1 pair of electrons are shared, so they have less of a pull on the two nucleus's of the atoms they bond. Therefore, they are longer than double of triple bonds, where more el...
by Lindsey Chheng 1E
Thu Nov 07, 2019 11:56 pm
Forum: Dipole Moments
Topic: Explain concept
Replies: 4
Views: 30

Re: Explain concept

I'm still not understanding the concept of dipole moment too well. Can someone explain how this applies in lewis structures? Dipole moments are the result of differences in electronegativities. An atom with a greater electronegativity, such as the Cl atom in HCl. Since the electronegativity of Cl i...
by Lindsey Chheng 1E
Thu Nov 07, 2019 11:53 pm
Forum: Lewis Structures
Topic: Formal Charges
Replies: 15
Views: 65

Re: Formal Charges

aphung1G wrote:Is it better for the central atom to have a +/- charge or have the other atoms take the +/- charge? And if so, why?

Dr Lavelle said that typically, charges are held by the outer atoms in a Lewis structure.
by Lindsey Chheng 1E
Thu Nov 07, 2019 11:50 pm
Forum: Trends in The Periodic Table
Topic: electronegativity trend
Replies: 3
Views: 30

Re: electronegativity trend

why does the trend in electronegativity increase when you go up a column and increase when you go to the right in a row? Electronegativity is the ability for an atom to attract an electron. From top to bottom, electronegativity decreases since there is an increase in the distance between the nucleu...
by Lindsey Chheng 1E
Wed Nov 06, 2019 10:25 pm
Forum: Dipole Moments
Topic: Dipole Moments Determined by Electronegativity?
Replies: 3
Views: 26

Re: Dipole Moments Determined by Electronegativity?

Can someone please explain how electronegativity determines the dipole moments? Which element gets which partial charge? If Ionization Energy and Electron Affinity are high, then atom will have high Electronegativity and pull shared electrons towards it (resulting in a partial negative charge), the...
by Lindsey Chheng 1E
Thu Oct 31, 2019 8:54 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Relationship between uncertainties of position and momentum
Replies: 2
Views: 19

Relationship between uncertainties of position and momentum

In his lecture, Dr. Lavelle said that if you know something's position really well, then the uncertainty in the position will go down and the uncertainty in the momentum will go up. I understand why the uncertainty in the position goes down, but can someone explain the other?
by Lindsey Chheng 1E
Thu Oct 31, 2019 6:47 pm
Forum: Properties of Electrons
Topic: Atomic Spectra
Replies: 2
Views: 31

Re: Atomic Spectra

In homework problem 15 from section 1B, part d asks what what kind of electromagnetic radiation was used from a wavelength of 8.8 nm. The answer was x-ray/gamma rays, however, is this something we will have to know for exams? We are probably only expected to know that visible light falls under the ...
by Lindsey Chheng 1E
Thu Oct 31, 2019 6:45 pm
Forum: Student Social/Study Group
Topic: Midterm
Replies: 7
Views: 57

Re: Midterm

Lauren Haight 1E wrote:Does anyone know the general format of the midterm? As in, how many questions there will be and how many questions there will be on each topic we have gone over? Thanks.

There's going to be 8 questions on the midterm, and I'd assume each question contains its parts of a, b, c, etc.
by Lindsey Chheng 1E
Thu Oct 31, 2019 6:41 pm
Forum: DeBroglie Equation
Topic: When to use the de Broglie equation?
Replies: 5
Views: 43

Re: When to use the de Broglie equation?

romina_4C wrote:Do you only use this equation to find the wavelength or velocity of something that is not light (electrons, atoms, objects, etc.)?

Yes, I believe so since De Broglie is for any moving particle with momentum, p, that has wavelike properties with wavelength.
by Lindsey Chheng 1E
Thu Oct 31, 2019 6:39 pm
Forum: DeBroglie Equation
Topic: Unit Conversion
Replies: 2
Views: 41

Re: Unit Conversion

In homework problem 9 from section 1B, we are given 2 seconds which eventually needs to be converted to joules. The solution manual says that 2 seconds is equal to 64 J. How do we convert seconds to joules? So in the question we are given 32W, where 1 W = 1 J/s, which means that 32W = 32J/s. Use di...
by Lindsey Chheng 1E
Thu Oct 31, 2019 6:35 pm
Forum: Octet Exceptions
Topic: Octet exception
Replies: 2
Views: 20

Re: Octet exception

What causes a molecule to have an octet exception? Some atoms are stable with fewer electrons, which doesn't meet the octet rule: H, He, Li, Be, B. In class, Dr. Lavelle talked about how B and Al are involved in Lewis Acid-Base reactions, where B in BF3 completes its octet if other atom provides bo...
by Lindsey Chheng 1E
Thu Oct 24, 2019 1:06 am
Forum: Quantum Numbers and The H-Atom
Topic: Balmer and Lyman Series
Replies: 6
Views: 48

Re: Balmer and Lyman Series

Can someone explain what the Balmer and Lyman series are and what the significance of them is? Knowing the Balmer and Lyman series can help us identify whether or not the light is in the visible or UV region. Sometimes a problem will simply state that the light involved is in, say the UV region. Yo...
by Lindsey Chheng 1E
Thu Oct 24, 2019 1:02 am
Forum: Ionic & Covalent Bonds
Topic: electron configuration for ions
Replies: 3
Views: 69

Re: electron configuration for ions

how come when the book asks you to give the ground-state electron configuration for Ni^2+, the answer is [Ar]3d^8 and not [Ar]3d^64s^2? You have to remove electrons from the highest energy shell first, which in this case would be n=4. This is because the electrons in the highest energy shell, which...
by Lindsey Chheng 1E
Thu Oct 24, 2019 12:58 am
Forum: Ionic & Covalent Bonds
Topic: What are the exceptions to the octet rule?
Replies: 5
Views: 61

Re: What are the exceptions to the octet rule?

some atoms are stable with fewer than electrons: H, B, Be
some atoms are stable with more than 8 electrons: P, S, Cl, As, SE, Br, Kr, Sb, Te, I, Xe
by Lindsey Chheng 1E
Thu Oct 24, 2019 12:54 am
Forum: Properties of Light
Topic: Threshold Frequency
Replies: 5
Views: 43

Re: Threshold Frequency

I believe Threshold Frequency is the amount of energy of a photon required to displace an electron on a metal surface. The photon needs to at least match the threshold, which will result in a kinetic energy of 0. Yes that part makes sense to me but when we're calculating the threshold frequency, is...
by Lindsey Chheng 1E
Thu Oct 24, 2019 12:47 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: coulomb potential energy
Replies: 4
Views: 35

Re: coulomb potential energy

can someone explain to me the electrostatic/coulomb potential energy and its significance? I know it's proportional to (q1)(q2)/r. Coulomb's Law shows the relationship between q1, q2, and r, and their effects on the attractive forces between particles. -if q1 and q2 are opposite charges, then there...
by Lindsey Chheng 1E
Sat Oct 19, 2019 12:14 pm
Forum: Properties of Electrons
Topic: orbitals, shells, subshells
Replies: 4
Views: 52

Re: orbitals, shells, subshells

Level or shell: the level or "ring" that the electron occupies aka the Principal Quantum Number (n) Ex: 1s = 1st shell Ex: 2s and 2p = 2nd shell Sublevel or subshell: the combination of all the types of shapes (s, p, d, f) Ex: 1s = subshell Ex: 2s = subshell Ex: 2p = subshell Orbital: a si...
by Lindsey Chheng 1E
Sat Oct 19, 2019 12:09 pm
Forum: Properties of Light
Topic: Quantum equations
Replies: 5
Views: 28

Re: Quantum equations

505316964 wrote:Is velocity usually in nm or m? does it matter when using the equations if the question doesn't specify units?

velocity is usually in m/s
by Lindsey Chheng 1E
Sat Oct 19, 2019 12:08 pm
Forum: Properties of Electrons
Topic: "Exception" in Writing Electron Configurations
Replies: 4
Views: 34

Re: "Exception" in Writing Electron Configurations

In class today, Dr. Lavelle discussed an "exception" in writing electron configurations... He said "Half full d5 and full d10 subshells have lower energy". So in the example of Cr, the configuration is written as [Ar]3d5 4s1. Can anyone explain this to me? Why does the 4s shell ...
by Lindsey Chheng 1E
Sat Oct 19, 2019 11:54 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals vs. Shells
Replies: 5
Views: 41

Re: Orbitals vs. Shells

What is the difference between an orbital and a shell? Level or Shell: the level or "ring: that the electron occupies, which is the Principal Quantum Number (n) Orbital: a single shape that can hold up to 2 electrons (ex: px, py, or pz) - for this class, we are expected to know the shapes of s...
by Lindsey Chheng 1E
Sat Oct 19, 2019 11:46 am
Forum: *Shrodinger Equation
Topic: Wave Function and Orbitals
Replies: 3
Views: 34

Re: Wave Function and Orbitals

How exactly does Schrodinger's Wave Function equation relate to the orbitals (1s, 2s, 2p... etc.)? I know the orbitals are solutions to the Wave Function, but what exactly does that mean? Like do the orbitals have energies corresponding to the ones calculated by this equation? Atomic orbitals are s...
by Lindsey Chheng 1E
Sat Oct 12, 2019 12:31 pm
Forum: Einstein Equation
Topic: Diffraction Pattern
Replies: 3
Views: 35

Re: Diffraction Pattern

Could someone please explain what are constructive interference and destructive interference? Thanks. In phase means to interact with Constructive -two wavelengths are in phase, that is the peak of one wave is in phase with the peak of the other wave -together, the two waves result in a larger wave...
by Lindsey Chheng 1E
Sat Oct 12, 2019 12:27 pm
Forum: Photoelectric Effect
Topic: Module Post Assessment 33
Replies: 1
Views: 24

Re: Module Post Assessment 33

Molybdenum metal must absorb radiation with a minimum frequency of 1.09 x 10^15 s^-1 before it can emit an electron from its surface. Answer the following two questions. A. What is the minimum energy needed to produce this effect? B. If molybdenum is irradiated with 194 nm light, what is the maximu...
by Lindsey Chheng 1E
Sat Oct 12, 2019 12:24 pm
Forum: Photoelectric Effect
Topic: Video Module post assessment 34
Replies: 1
Views: 18

Re: Video Module post assessment 34

Could someone explain to me how I would go about solving for the kinetic energy in problem 34 B on the post assessment of the photoelectric effect? I was able to get the first part of the minimum energy, but I do not know how to get the max kinetic energy after being given the wavelength. Do we hav...
by Lindsey Chheng 1E
Sat Oct 12, 2019 12:06 pm
Forum: Properties of Electrons
Topic: Mass of Electron in De Broglie Equation
Replies: 4
Views: 30

Re: Mass of Electron in De Broglie Equation

Dr. Lavelle said things like the mass of an electron, proton, or neutron are things that we are not responsible for memorizing and will be provided for us on our formula/equation sheets on tests.
by Lindsey Chheng 1E
Sat Oct 12, 2019 11:49 am
Forum: Properties of Light
Topic: Shorter Wavelength
Replies: 3
Views: 19

Re: Shorter Wavelength

Photons with longer wavelength (lower frequency) do not have enough energy to meet the threshold energy, which is the energy required to remove an electron from a metal surface. Unless the E (photon) is greater than or equal to E (energy to remove an electron), then an electron is not emitted, even ...
by Lindsey Chheng 1E
Sat Oct 12, 2019 11:06 am
Forum: General Science Questions
Topic: Tutoring
Replies: 3
Views: 48

Re: Tutoring

Don't forget that you are allowed to drop by at any TA's office hours, not just the TA you have for your discussion section! Here are all the office hours for this Fall 2019! You can also find this on Dr. Lavelle's website. MONDAY: Ben [censored], 8-10am, Young Hall 1370 bhoar@chem.ucla.edu Brandon ...
by Lindsey Chheng 1E
Thu Oct 03, 2019 12:31 am
Forum: Properties of Light
Topic: Properties of light in class
Replies: 3
Views: 56

Re: Properties of light in class

we talked a little about the properties of light in class today and I was a bit confused. Where does the value Hertz come from and how does that have to do with frequency, amplitude, and light in general. Also, when we are talking about strength of light what do we usually look at? Sorry if my ques...
by Lindsey Chheng 1E
Thu Oct 03, 2019 12:21 am
Forum: Administrative Questions and Class Announcements
Topic: Sapling Learning
Replies: 3
Views: 49

Sapling Learning

Does anyone know of a way to get Sapling Learning by itself for a decent price instead of purchasing the whole UCLA bookstore bundle? I only need Sapling Learning because I have the rest of the books already.
by Lindsey Chheng 1E
Thu Oct 03, 2019 12:11 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Balancing Equations [ENDORSED]
Replies: 25
Views: 471

Re: Balancing Equations [ENDORSED]

When balancing an equation in lecture prof Lavelle multiplied the entire equation by 2 in order to get the lowest whole number. Will points be deducted on the test if we don’t do so ? The reason why we want all coefficients to be whole numbers is because we are trying to find the mol to mol ratio b...
by Lindsey Chheng 1E
Wed Oct 02, 2019 11:55 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula [ENDORSED]
Replies: 6
Views: 331

Re: Empirical Formula [ENDORSED]

Typically, compounds are written as the cation first then the anion, or metals first then nonmetals (Hydrogen is an exception).
by Lindsey Chheng 1E
Wed Oct 02, 2019 4:41 pm
Forum: Limiting Reactant Calculations
Topic: Topics on Upcoming Test [ENDORSED]
Replies: 7
Views: 165

Re: Topics on Upcoming Test [ENDORSED]

There's going to be 7 questions on Test 1!

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