Search found 74 matches

by Nikki Razal 4E
Fri Jan 17, 2020 2:17 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Tips for Test
Replies: 16
Views: 51

Re: Tips for Test

^^ a lot of homework problems should help because Dr. Lavelle often gets problems from homework and put them on the test
by Nikki Razal 4E
Fri Jan 17, 2020 2:14 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Determining molar concentration
Replies: 2
Views: 14

Re: Determining molar concentration

I feel like you would start by changing grams of PCl5 to moles then finding the molarity of the initial PCl5 by dividing this number by the liters, then continue solving the problem as an ICE box
by Nikki Razal 4E
Fri Jan 17, 2020 2:08 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solids and Equilibrium
Replies: 9
Views: 25

Re: Solids and Equilibrium

neither affects equilibrium because they are both pure substances
by Nikki Razal 4E
Fri Jan 17, 2020 2:07 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Solids and Liquids in Le Chatelier
Replies: 5
Views: 17

Re: Solids and Liquids in Le Chatelier

no, solids or liquids (pure substances) would not affect le chatelier because they are not technically included in the equilibrium expression
by Nikki Razal 4E
Fri Jan 17, 2020 2:05 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ICE and quadratic formula
Replies: 11
Views: 30

Re: ICE and quadratic formula

you can only avoid using the quadratic formula when you are given a small k value (<10^-3), otherwise you would have to solve for x normally, which may require you to use the quadratic formula
by Nikki Razal 4E
Sat Jan 11, 2020 3:46 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction quotient
Replies: 8
Views: 26

Re: Reaction quotient

K is calculated at equilibrium , while Q is calculated anytime during the reaction
by Nikki Razal 4E
Sat Jan 11, 2020 3:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Partial Pressure
Replies: 7
Views: 22

Re: Partial Pressure

yes, you use partial pressure when all products and reactants are in the gas phase, and you use the equilibrium constant Kp
by Nikki Razal 4E
Sat Jan 11, 2020 3:42 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: HW 5J.5
Replies: 8
Views: 25

Re: HW 5J.5

^^^ the molar concentrations of a pure substance (solid or liquid) does not affect K
by Nikki Razal 4E
Sat Jan 11, 2020 3:36 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Q
Replies: 10
Views: 30

Re: Q

Yes! Q or Qc or Qp is calculated the same way as K :)
by Nikki Razal 4E
Sat Jan 11, 2020 3:35 pm
Forum: Ideal Gases
Topic: K vs Q [ENDORSED]
Replies: 7
Views: 41

Re: K vs Q [ENDORSED]

K is the equilibrium constant (this tells us where the equilbrium sits), while Q is the reaction quotient (this determines which direction a rxn will proceed)
by Nikki Razal 4E
Sat Jan 11, 2020 3:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G.1 [ENDORSED]
Replies: 4
Views: 21

Re: 5G.1 [ENDORSED]

for this question, the statement, "If one starts with a higher pressure of reactant, the equilibrium constant will be larger" is false because your initial concentration increases, causing the equilibrium constant to be smaller. For example,if you had the equation N2+3H2 <-->2NH3 and an in...
by Nikki Razal 4E
Sat Dec 07, 2019 1:13 am
Forum: Administrative Questions and Class Announcements
Topic: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]
Replies: 111
Views: 4077

Re: MARSHMALLOW- FINAL REVIEW SESSION [ENDORSED]

for question 40c, how do you know whether o2 or o3 has the stronger bond and why?
by Nikki Razal 4E
Sat Dec 07, 2019 1:10 am
Forum: Dipole Moments
Topic: Lone pairs
Replies: 5
Views: 45

Re: Lone pairs

^^ to add on to that, dipole moments are created by lone pairs if the lone pairs don't cancel each other out, and one factor that can influence whether or not they cancel out is by looking at the bond angles
by Nikki Razal 4E
Sat Dec 07, 2019 1:01 am
Forum: Amphoteric Compounds
Topic: As2O3
Replies: 2
Views: 25

Re: As2O3

between the metal oxides (bases) and nonmetal oxides (acids), there is a diagonal band of amphoteric oxides closely matching the diagonal band of metalloids
by Nikki Razal 4E
Sat Dec 07, 2019 12:59 am
Forum: Amphoteric Compounds
Topic: how to identify?
Replies: 5
Views: 70

Re: how to identify?

amphiprotic= means that a molecule has the ability to either donate and accept H+
amphoteric= means that a molecule can either act as an acid or a base
by Nikki Razal 4E
Sat Dec 07, 2019 12:55 am
Forum: Hybridization
Topic: N-triple bond-N pi bond hybridization
Replies: 4
Views: 41

Re: N-triple bond-N pi bond hybridization

AngieGarcia_4F wrote:(N2p, N2p) because pi bonds happen when p orbitals overlap.


does this mean that pi bonds can only be formed in p orbitals only?
by Nikki Razal 4E
Sat Dec 07, 2019 12:52 am
Forum: Naming
Topic: oxidation number
Replies: 3
Views: 27

Re: oxidation number

^^ tungsten and molybdenum can get up to +6 I believe, and arsenic can be +5
by Nikki Razal 4E
Sat Dec 07, 2019 12:50 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 2
Views: 40

Re: Orbitals

Once you find out what "l" is, you can figure out how many orbitals there are because to find the number of orbitals you can plug "l" into the equation 2*l+1, and that will give you the number of orbitals. Or you can think that ml=-l,...0...,+l, and the number of values you get a...
by Nikki Razal 4E
Sat Dec 07, 2019 12:36 am
Forum: Hybridization
Topic: 2s for Carbon hybridization
Replies: 3
Views: 19

Re: 2s for Carbon hybridization

carbon is from the energy level, n=2
by Nikki Razal 4E
Sun Dec 01, 2019 3:39 am
Forum: Lewis Acids & Bases
Topic: Conjugate acid and conjugate base
Replies: 2
Views: 19

Re: Conjugate acid and conjugate base

I usually just look at the products of the equation, and the product with an additional H+ is the conjugate acid because bases accept protons based on the Bronsted- Lowry definition. Similarly, since acids donate protons, the product with an H+ taken away from it will be the conjugate base
by Nikki Razal 4E
Sun Dec 01, 2019 3:34 am
Forum: Biological Examples
Topic: How many do we need to know?
Replies: 1
Views: 34

Re: How many do we need to know?

On the syllabus, Dr. Lavelle said to know 3: hemoglobin, myoglobin, and vitamin B12
by Nikki Razal 4E
Sun Dec 01, 2019 3:29 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Dimagnetism & Paramagnetism
Replies: 6
Views: 43

Re: Dimagnetism & Paramagnetism

I don't think it will be heavily tested either, but just so you know "diamagnetic" means that all electrons are paired, whereas "paramagnetic"means that not all electrons are paired
by Nikki Razal 4E
Sun Dec 01, 2019 3:20 am
Forum: Biological Examples
Topic: Vitamin B12
Replies: 3
Views: 24

Vitamin B12

What is the biological function of the naturally occurring coordination compound, vitamin B12?
by Nikki Razal 4E
Sun Dec 01, 2019 3:17 am
Forum: Amphoteric Compounds
Topic: 6A.17
Replies: 3
Views: 30

Re: 6A.17

How would you know that Bi2O3 is amphoteric?
by Nikki Razal 4E
Sun Dec 01, 2019 3:11 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Difference between Arrhenius, Bronsted, and Lewis
Replies: 5
Views: 36

Re: Difference between Arrhenius, Bronsted, and Lewis

An arrhenius:
- acid: gives off H+
- base: gives off OH-

Bronsted-Lowry
- acid: is a proton donor
- base: is a proton acceptor

Lewis
- acid: is an electron acceptor
-base: is an electron donor
by Nikki Razal 4E
Sun Dec 01, 2019 2:48 am
Forum: Administrative Questions and Class Announcements
Topic: Difficulty
Replies: 14
Views: 95

Re: Difficulty

I agree with Kayley and Megan, I took AP chem in high school, and I think it definitely helped, but I also am not having an easy time in the class either. There's a lot of concepts like they were saying that go more in depth here in college
by Nikki Razal 4E
Sat Nov 23, 2019 7:37 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Forming Chelating Complexes: HW 9C.7
Replies: 1
Views: 36

Forming Chelating Complexes: HW 9C.7

In reference to HW 9C.7 (Which of the following isomers of diaminobenzene can form chelating complexes? Explain your reasoning.) and/or 9C.8 (Which of the following ligands do you expect to form chelating complexes? Explain your reasoning.) How do you know what isomers or ligands can form chelating ...
by Nikki Razal 4E
Sat Nov 23, 2019 7:27 pm
Forum: Naming
Topic: Latin Names of Atoms
Replies: 4
Views: 26

Re: Latin Names of Atoms

^^ in Lavelle's lectures I feel like he uses the English name, plus the book uses the English name from what I've seen
by Nikki Razal 4E
Sat Nov 23, 2019 7:25 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand
Replies: 4
Views: 16

Re: Ligand

In the book, a ligand refers to "A group attached to the central metal ion in a complex"
by Nikki Razal 4E
Sat Nov 23, 2019 7:22 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 15
Views: 92

Re: Cisplatin

^^ just to add on, Lavelle was saying how transplatin is only able to form one bond in DNA (which is weak, so it can't stop cell division), whereas cis platin is able to form 2 bonds in the DNA, causing for the DNA to be interfered with enough to the point of stopping cell division & ultimately,...
by Nikki Razal 4E
Sat Nov 23, 2019 7:03 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Hydrogen Bonding/Pi bonds
Replies: 11
Views: 91

Re: Hydrogen Bonding/Pi bonds

805097738 wrote:
Zoya Mulji 1F wrote:Intermolecular forces:
ionic bonding --> H-bonding --> dipole-dipole bonding --> induced dipole/London dispersion


is this ascending or descending in strength?



this is in decreasing strength. hydrogen bonds are the strongest and LDF /induced dipole forces are the weakest
by Nikki Razal 4E
Sun Nov 17, 2019 8:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 7
Views: 34

Re: VSEPR

^^ i think we would also need to know the bond angles and were not necessarily graded on the lewis structure, but in order to determine the shape, we'd have to know how to draw the lewis structure
by Nikki Razal 4E
Sun Nov 17, 2019 8:25 pm
Forum: Sigma & Pi Bonds
Topic: sigma and pi bonds
Replies: 4
Views: 18

Re: sigma and pi bonds

sigma bonds are just single bonds, pi bonds occur when you have a double bond or triple bond. if you have a double bond, you would have one sigma and one pi bond, and if you had a triple bond, youd have one sigma and two pi bonds
by Nikki Razal 4E
Sun Nov 17, 2019 8:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs non polar
Replies: 5
Views: 28

Re: Polar vs non polar

no, some of the lone pairs will create dipole moments that cancel each other out, resulting in a molecule not necessarily becoming polar
by Nikki Razal 4E
Sun Nov 17, 2019 8:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 22

Re: Bond Angles

They'll always be smaller because the lone pairs repel shared electrons, reducing bond angles. In general, atoms/electrons want to be as far away as possible due to electron repulsion. Molecules w/ lone pairs lower bond angles because lone pairs repel shared electrons, leading shared electrons to be...
by Nikki Razal 4E
Sun Nov 17, 2019 5:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: geometric angles
Replies: 4
Views: 18

Re: geometric angles

^^^ the geometric angles correspond with the VSEPR chart which depends on how many bonding pairs and lone pairs you have. for example a structure with 2 bonding pairs and 2 lone pairs would be bent and would have bond angles of less than 109.5 because of the lone pairs “pushing” on the angles in the...
by Nikki Razal 4E
Sun Nov 17, 2019 5:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Cis-Dichloroethene vs Trans-Dichloroethene
Replies: 3
Views: 25

Re: Cis-Dichloroethene vs Trans-Dichloroethene

just to add on, cis structures will have the same elements on one side of a structure, making it polar, whereas trans structures will have the same elements on opposite sides of the structure, making it nonpolar
by Nikki Razal 4E
Wed Nov 06, 2019 4:18 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: HW 2D.3
Replies: 5
Views: 63

HW 2D.3

Can someone explain to me why BaBr2 has bonds primarily ionic?
(in reference to HW question 2D.3:
"Which of these compounds has bonds that are primarily ionic? (a) BBr3; (b) BaBr2; (c) BeBr2."
by Nikki Razal 4E
Wed Nov 06, 2019 4:15 am
Forum: Photoelectric Effect
Topic: HW Question Focus 1, 1.3
Replies: 1
Views: 38

HW Question Focus 1, 1.3

How would you solve the problem Focus 1.3 in the textbook: "In each second, a certain lamp produces 2.4 x 10^21 photons with a wavelength of 633 nm. How much power (in watts) is produced as radiation at this wavelength (1W = 1 J x s^-1)?" I tried using E=hv and c=wavelength(frequency) and ...
by Nikki Razal 4E
Mon Nov 04, 2019 1:07 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Uncertainty Quantum World Worksheet
Replies: 3
Views: 61

Heisenberg Uncertainty Quantum World Worksheet

The question: "Your bowling ball of mass 4.02kg rolls down a lane with a speed of 2.35+/-0.1m/s. What is the minimum indeterminancy of its position? Can you blame the Heisenberg Uncertainty Principle when your ball misses the pins" appeared in Karen's Quantum World WS. How do you know when...
by Nikki Razal 4E
Mon Nov 04, 2019 1:00 pm
Forum: SI Units, Unit Conversions
Topic: Memorizing Conversions
Replies: 23
Views: 219

Re: Memorizing Conversions

There's a few conversions on the sheet, such as 1nm=10^-9m, but I would look at the conversion sheet to see what conversions you should become more familiar with
by Nikki Razal 4E
Sun Nov 03, 2019 6:54 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge and Energy
Replies: 4
Views: 19

Re: Formal Charge and Energy

the lowest energy lewis structure has an overall formal charge of 0/close to 0
by Nikki Razal 4E
Sun Nov 03, 2019 6:42 pm
Forum: Octet Exceptions
Topic: Expanded Valence Shells
Replies: 6
Views: 31

Expanded Valence Shells

Why can only some elements in the 3rd period have an expanded valence shell?
by Nikki Razal 4E
Sun Nov 03, 2019 6:38 pm
Forum: Trends in The Periodic Table
Topic: Drawing Structures
Replies: 3
Views: 15

Re: Drawing Structures

You can draw a molecule in different ways/ a molecule has resonance when you can draw a structure with multiple bonds in different positions (ie move one bond to another to create a double bond)
by Nikki Razal 4E
Sun Nov 03, 2019 6:36 pm
Forum: Resonance Structures
Topic: Resonance structures
Replies: 6
Views: 30

Re: Resonance structures

a resonance structure is a blending of lewis structures with the same arrangements of atoms but different arrangement of electrons. it spreads multiple bond character over a molecule and also can lower its energy
by Nikki Razal 4E
Sun Nov 03, 2019 6:31 pm
Forum: Lewis Structures
Topic: lowest energy
Replies: 5
Views: 28

Re: lowest energy

^^ the central atom/all atoms would have a formal charge of 0; basically the lowest energy lewis structure will be the lewis structure with the overall formal charge closest to zero
by Nikki Razal 4E
Sun Oct 27, 2019 9:43 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge
Replies: 3
Views: 29

Re: Formal charge

Find the formal charge of each bound atom then add up all the individual formal charges to find the overall formal charge. The most stable atoms have a formal charge of 0.
by Nikki Razal 4E
Sun Oct 27, 2019 9:39 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Finding Most Stable Structure
Replies: 9
Views: 56

Re: Finding Most Stable Structure

The most stable compounds typically have an overall total charge of zero (the exception would be if the compound or element is an anion or cation, that is, if they have an overall charge other than zero). And just a quick note, formal charge = # of valence electrons an atom has - (# bonds + lone pai...
by Nikki Razal 4E
Sun Oct 27, 2019 9:26 pm
Forum: Lewis Structures
Topic: Choosing the central atom
Replies: 16
Views: 69

Re: Choosing the central atom

The central atom is the element with the lowest ionization energy. Usually, it is the first element in a compound, and when it is placed in the middle, you are able to draw atoms symmetrically around it.
by Nikki Razal 4E
Sun Oct 27, 2019 9:23 pm
Forum: Octet Exceptions
Topic: octet exceptions
Replies: 5
Views: 33

Re: octet exceptions

^^ atoms in period 3 or higher have d-orbitals in valence shell that can accommodate additional electrons.
by Nikki Razal 4E
Sun Oct 27, 2019 9:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 1E.23 (unpaired electrons)
Replies: 2
Views: 24

Re: 1E.23 (unpaired electrons)

For me, the easiest way to determine how many atoms are unpaired or paired is just to draw out an energy diagram and fill up the orbitals until all electrons are accounted for. Just a note, when all electrons are paired, the compound is known to be diamagnetic, and when they're not al paired, it is ...
by Nikki Razal 4E
Sun Oct 27, 2019 9:11 pm
Forum: Trends in The Periodic Table
Topic: Electron affinity.
Replies: 8
Views: 28

Re: Electron affinity.

Electron affinity is the energy released when an electron is added to a neutral atom to become an anion.
by Nikki Razal 4E
Sun Oct 27, 2019 9:09 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic VS. Covalent Bond
Replies: 8
Views: 33

Re: Ionic VS. Covalent Bond

Ionic bonds form when a metal transfers its electrons with a nonmetal (this involves cation and anion interactions), and covalent bonds form when nonmetals share electrons. Nonmetals do not form cations because their ionization energies are too high.
by Nikki Razal 4E
Sun Oct 27, 2019 9:02 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 6
Views: 34

Electronegativity

If electronegativity increases from left to right and bottom to top of the periodic table, why is fluorine the most electronegative element?
by Nikki Razal 4E
Sun Oct 20, 2019 11:57 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing Electron Configurations
Replies: 7
Views: 55

Re: Writing Electron Configurations

yup just to add on, you could either write nitrogen is 1s^2, 2s^2, 2px^1, 2py^1, 2pz^1, or nitrogen is 1s^2, 2s^2, 2p^3 and both would be correct
by Nikki Razal 4E
Sun Oct 20, 2019 11:55 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions for Electron Configuration
Replies: 6
Views: 24

Re: Exceptions for Electron Configuration

He said the two exceptions were for the elements copper (Cu) and chromium (Cr)
by Nikki Razal 4E
Wed Oct 16, 2019 12:36 am
Forum: Quantum Numbers and The H-Atom
Topic: hw help
Replies: 1
Views: 49

hw help

In reference to question 1.E.1, "Which of the following increase when an electron in a lithium atom undergoes a transition from the 1s-orbital to a 2p-orbital? (a) Energy of the electron. (b) Value of n. (c) Value of l. (d) Radius of the atom. Which answers would be different for a hydrogen ato...
by Nikki Razal 4E
Wed Oct 16, 2019 12:21 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: HW Help
Replies: 3
Views: 30

HW Help

For HW problem 1.D.23: "How many orbitals can have the following quantum numbers in an atom:(a)n=2,l=1;(b)n=4,l=2,m1=-2; (c)n=2;(d)n=3,l=2,m1 =+1?" Would it be better to state the max number of orbitals, or all the different possibilities? For example, for part c, you can assume l = -1,0,1...
by Nikki Razal 4E
Tue Oct 15, 2019 11:58 pm
Forum: Properties of Light
Topic: Homework help
Replies: 4
Views: 53

Re: Homework help

For this problem, do I need to find the mole of sodium? 1B.7 Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589 nm. How much energy is emitted by (a) an excited sodium atom when it generates a photon; @aphung1G, for part a, you don't have to because you're given enoug...
by Nikki Razal 4E
Tue Oct 15, 2019 11:54 pm
Forum: Properties of Light
Topic: Homework help
Replies: 4
Views: 53

Re: Homework help

for 1.B.15, you use λ=h/mv h is a constant = 6.626x10^-34 J m = mass of electron (bc it is the object being ejected) = 9.11x10^-31 kg (m in general is not a constant, but the mass of an electron is, so this isn't exactly given in the problem, but it is implied that you know it already) v = velocity ...
by Nikki Razal 4E
Tue Oct 15, 2019 11:47 pm
Forum: Quantum Numbers and The H-Atom
Topic: Week 3 HW Help
Replies: 1
Views: 28

Week 3 HW Help

How many orbitals are present in the (a) 4p-subshell; (b) 3d-subshell; (c) 1s-subshell; (d) 4f-subshell of an atom?
by Nikki Razal 4E
Sun Oct 13, 2019 9:34 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Indeterminancy In Class
Replies: 7
Views: 38

Re: Indeterminancy In Class

no, but dr. lavelle posted a video all about it on his website!
by Nikki Razal 4E
Fri Oct 11, 2019 1:22 pm
Forum: Properties of Light
Topic: Energy Levels and Color of light
Replies: 4
Views: 40

Energy Levels and Color of light

just to clarify, what is the relationship between the color of light emitted and the energy level an electron jumps to?
by Nikki Razal 4E
Fri Oct 11, 2019 1:11 pm
Forum: Properties of Electrons
Topic: Energy
Replies: 6
Views: 54

Re: Energy

if i'm not mistaken, the electron falls back to ground state just because over time, it starts to lose energy and becomes less excited
by Nikki Razal 4E
Fri Oct 11, 2019 1:03 pm
Forum: Properties of Light
Topic: Types of Light Series
Replies: 3
Views: 38

Types of Light Series

The Lyman series consists of lines in the UV region, and the Balmer series consists of lines in the visible light region. Does anyone know what regions the Paschen series and the Brackett series are in?
by Nikki Razal 4E
Fri Oct 11, 2019 12:59 pm
Forum: SI Units, Unit Conversions
Topic: How to express answers
Replies: 13
Views: 166

Re: How to express answers

^^ agreed, my TA told me not to be worried about sig figs at all, but I'd just be aware of it. also, I heard when writing out chemical equations, just write the states of each element to be safe (ie. (aq),(l),(g),(s))
by Nikki Razal 4E
Fri Oct 11, 2019 12:44 pm
Forum: Properties of Light
Topic: Homework Question 1A.3
Replies: 3
Views: 32

Re: Homework Question 1A.3

To add on to what everyone else was saying, "a" wouldn't be right because for our purposes, the speed of radiation is constant "b" wouldn't be right because wavelength and frequency have an inverse relationship, and "d" wouldn't be right because energy is proportional t...
by Nikki Razal 4E
Thu Oct 03, 2019 11:31 am
Forum: Limiting Reactant Calculations
Topic: Homework Week 1
Replies: 18
Views: 191

Re: Homework Week 1

and just another sidenote, my TA said that we only turn in 5 questions, so don't turn in all your hw if you end up doing more
by Nikki Razal 4E
Thu Oct 03, 2019 11:30 am
Forum: Limiting Reactant Calculations
Topic: Homework Week 1
Replies: 18
Views: 191

Re: Homework Week 1

^^^ I'm p sure ANY five, so they could all be from the same section if you really wanted
by Nikki Razal 4E
Thu Oct 03, 2019 11:27 am
Forum: Balancing Chemical Reactions
Topic: Question E3
Replies: 3
Views: 54

Question E3

Are there certain calculations you could set up to solve question E3?: "In a nanotechnology lab you might have the capability to manipulate individual atoms. The atoms on the left are gallium atoms (molar mass 70 g?mol21), and those on the right are atoms of astatine (molar mass 210 g?mol21). H...
by Nikki Razal 4E
Thu Oct 03, 2019 11:17 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Accuracy vs. Precision
Replies: 3
Views: 61

Re: Accuracy vs. Precision

Precision is how close together measurements are, and accuracy is the measurement's closeness to the true value. The application they have to chemistry is mainly in labs or hypothetical situations where people have to measure out substances. Ideally, you'd want your measurements to be accurate and p...
by Nikki Razal 4E
Thu Oct 03, 2019 11:10 am
Forum: Student Social/Study Group
Topic: Study Tips
Replies: 58
Views: 737

Re: Study Tips

Outside the practice problems and resources Dr. Lavelle has, I (and my TA) think it'd be a big help to start familiarizing yourself with the different polyatomic ions because they make the "naming" section of the course easier, plus it'll help make work easier now esp when you have to writ...
by Nikki Razal 4E
Thu Oct 03, 2019 11:07 am
Forum: SI Units, Unit Conversions
Topic: Question about final answers on tests
Replies: 8
Views: 106

Re: Question about final answers on tests

thank you so much!!
by Nikki Razal 4E
Wed Oct 02, 2019 1:26 pm
Forum: SI Units, Unit Conversions
Topic: Question about final answers on tests
Replies: 8
Views: 106

Question about final answers on tests

Does anyone know if we have to write (aq), (l), (s), or (g) in the chemical equations of final answers for tests or homework in order to get full credit?/Do we lose points for not identifying the different states an element or compound is in?

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