Search found 69 matches

by Jasmin Argueta 1K
Fri Mar 15, 2019 1:03 am
Forum: Reaction Mechanisms, Reaction Profiles
Topic: K constants
Replies: 2
Views: 23

K constants

In regards to K in chemical kinetics, when would we use big K and little k? are both needed only when using the pre-equilibrium approach? I know big K is products/reactants and little k is forward/reverse or k1/k1'. Is this the only instance we'll need to connect the two? I am asking because I usual...
by Jasmin Argueta 1K
Wed Mar 13, 2019 12:45 am
Forum: General Rate Laws
Topic: Problem 7A17
Replies: 1
Views: 17

Problem 7A17

For this problem we are given a chart and asked to find the order of each, A,B, and C in this case. I was able to get A because I understood that you double the concentration and doubled the rate therefore its first order. I also understood C in which we tripled the concentration and multiplied the ...
by Jasmin Argueta 1K
Tue Mar 12, 2019 8:26 pm
Forum: First Order Reactions
Topic: Problem 7A9
Replies: 1
Views: 15

Re: Problem 7A9

and the problem Is asking for initial rat of decomposition so how would rate=rate constant x [concentration]^x give you the "initial" rate.
by Jasmin Argueta 1K
Tue Mar 12, 2019 8:24 pm
Forum: First Order Reactions
Topic: Problem 7A9
Replies: 1
Views: 15

Problem 7A9

For this problem we are told it is a first order, the rate constant, and are able to figure out molarity. You are asked to find the initial rate of decomposition. I would think to use ln[A]=-kt+ln[A0] because the A0. Instead we use rate= rate constant x [concentration]^x. How do we know to use this ...
by Jasmin Argueta 1K
Thu Mar 07, 2019 11:52 pm
Forum: First Order Reactions
Topic: Half life- zero order
Replies: 1
Views: 25

Half life- zero order

Does anyone understand why the half life concentration in zero order reactions is dependent of the reaction concentration, while first order reactions are independent of the reaction concentration. I understand there is an [A] in the half life reaction for zero order reactions, but why is it need co...
by Jasmin Argueta 1K
Thu Mar 07, 2019 11:44 pm
Forum: First Order Reactions
Topic: First oder graphs
Replies: 2
Views: 56

First oder graphs

During lecture Lavelle derived the first order reaction and showed us the graph that correlated. I am a bit confused because the graph for a first order reaction is liner, although he said ln[A] on the y axis is exponential. Why is the graph not exponential if it includes ln?
by Jasmin Argueta 1K
Thu Mar 07, 2019 11:40 pm
Forum: Second Order Reactions
Topic: Third order reactions
Replies: 1
Views: 36

Third order reactions

Does anyone know how to determine the units of third order reactions? I know we only learn up to second order, but my PLF was telling me it was still an important concept to know. Is it 1/(Molarity^2)(Time) I believe. Does anyone understand why the molarity would be squared rather than to the power ...
by Jasmin Argueta 1K
Thu Feb 28, 2019 10:39 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 6L3 part d
Replies: 1
Views: 45

6L3 part d

For this problem we are given the galvanic cell written pt|o2|h+||OH-|o2|pt. I am complelty confused on how to write the redox reaction, a-c was fine but part d I'm not sure how to even come up with the half reactions due to the H+ and OH-. What I got was the oxidation being O2-->H+ becoming 5H++O2-...
by Jasmin Argueta 1K
Thu Feb 28, 2019 8:20 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: 63L
Replies: 1
Views: 35

63L

For this problem we are given a galvanic cells and told to write half reactions and full redox reaction. In the solutions Manuel it shows the value of the Ecell by subtracting the anode and the cathode. The problem isn't asking for the Ecell value so I'm a bit confused why its even written, also how...
by Jasmin Argueta 1K
Thu Feb 28, 2019 7:13 pm
Forum: Balancing Redox Reactions
Topic: Problem K3 D
Replies: 2
Views: 29

Problem K3 D

Hi everyone, just wondering if anyone can explain why in the redox reaction cl2---> HCLO+Cl2 the cl2 goes from cl2+2electrons--->2Cl- , in particular where does the minus come from that allows you to know to add the electrons to the left side?
by Jasmin Argueta 1K
Fri Feb 22, 2019 12:09 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gibbs and Work
Replies: 1
Views: 33

Gibbs and Work

What is the relationship between Gibbs free energy and the maximum potential energy of a reaction? Wmax is equal to nFE does that mean G is equal to -nFE.
by Jasmin Argueta 1K
Thu Feb 21, 2019 7:57 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Voltaic Cell electron movement
Replies: 1
Views: 31

Voltaic Cell electron movement

in a voltaic cell example given in class, what is the purpose of having both the Zn ions and the Cu ions in the solution? Do the electrons from the Zn ions leave the solution via the wire? If they do is why the Cu ions attach to the solid Cu? If that is the case what is the force that makes Cu pull ...
by Jasmin Argueta 1K
Thu Feb 21, 2019 7:42 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Electrolytic vs Galvanic process
Replies: 1
Views: 17

Electrolytic vs Galvanic process

Conceptually what is the difference between an electrolytic process vs a Galvanic process? From my understanding, an electrolytic process is like the example given by Lavelle where there was the Zn and Cu suspended in an electrolyte solution with the salt bridge. However, I don't understand if the e...
by Jasmin Argueta 1K
Thu Feb 14, 2019 10:03 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: KbNa
Replies: 1
Views: 63

KbNa

During my PLF I was taught that in regards to the equation S=kblnW^na that KbxNA(moles) gets you the gas constant. Can anyone explain how and why Boltzmann constant and Avogadros number gets the gas constant.
by Jasmin Argueta 1K
Thu Feb 14, 2019 9:59 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: System and surroundings
Replies: 4
Views: 71

System and surroundings

Can anyone explain why the change in the system= the negative change of the surrounding in regards to reversible reactions. I can't seem to understand this conceptually.
by Jasmin Argueta 1K
Thu Feb 14, 2019 9:58 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: HOTDOG problem
Replies: 3
Views: 101

HOTDOG problem

In number 4A of the hotdog packet we didn't multiply the enthalpies by a negative when we flipped the reaction, does anyone know why? I thought we were suppose to multiply by a negative when we flipped the reaction because it's now the inverse.
by Jasmin Argueta 1K
Thu Feb 14, 2019 9:53 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Isothermal and reversible
Replies: 1
Views: 54

Isothermal and reversible

I understand isothermal means there is a constant temperature therefore your total energy of the system is 0 and q=-w. Although does this also apply to reversible processes, one of the LA's told me they could be used interchangeably at times but I wanted to clarify.
by Jasmin Argueta 1K
Thu Feb 07, 2019 8:44 pm
Forum: Phase Changes & Related Calculations
Topic: Problem 4A7 7th edition
Replies: 1
Views: 32

Problem 4A7 7th edition

In part B the problem it is asking for the percentage of heat used to raise the temperature of water. For this you divide heat required by copper over heat required by water(obtained in part a) then multiple by 100. Can anyone explain conceptually why you must divide those two then multiply by 100 t...
by Jasmin Argueta 1K
Thu Feb 07, 2019 7:31 pm
Forum: Phase Changes & Related Calculations
Topic: 7th Edition 4A3
Replies: 2
Views: 43

Re: 7th Edition 4A3

Thank you!
by Jasmin Argueta 1K
Wed Feb 06, 2019 5:26 pm
Forum: Phase Changes & Related Calculations
Topic: 4A3 7th Edition
Replies: 3
Views: 47

4A3 7th Edition

In regards to this problem, part c asks for the internal energy of the system. The work done is 28J and the internal energy is also 28J. I know internal energy is change in U=q+w, although since there is no heat being added would this mean q is zero? Making it an adiabatic system? This is the only w...
by Jasmin Argueta 1K
Wed Feb 06, 2019 5:16 pm
Forum: Phase Changes & Related Calculations
Topic: 7th Edition 4A3
Replies: 2
Views: 43

7th Edition 4A3

For this problem I'm very lost. Its discussing compressing air into a tire through the use of a pump. To get work the equation w=(-Pexternal)x(change in volume) is used. Where is the negative P coming from?
by Jasmin Argueta 1K
Thu Jan 31, 2019 10:14 pm
Forum: Phase Changes & Related Calculations
Topic: Phase change and temperature
Replies: 3
Views: 47

Phase change and temperature

In the ice to steam energy graph how does energy not effect temperature during a phase change? I understand energy is needed to break the bonds in order to complete the phase change but how does that same energy needed not increasing the kinetic energy of the molecules?
by Jasmin Argueta 1K
Thu Jan 31, 2019 10:10 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard enthalpy
Replies: 1
Views: 46

Standard enthalpy

As stated during lecture, the standard enthalpy of formation of an element in its most stable form is zero. Can someone please elaborate, I don't understand how this would be most stable especially when thinking back to 14A and stability being a result of a correct formal charge+octet.
by Jasmin Argueta 1K
Thu Jan 31, 2019 9:57 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Angles
Replies: 5
Views: 62

Bond Angles

Why is it that when bonds are formed we place a negative in front of the value? This is in regards to calculating enthalpy through bond angles in lecture.
by Jasmin Argueta 1K
Thu Jan 24, 2019 10:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5G1part d
Replies: 1
Views: 35

5G1part d

"If one starts with higher concentration of reactants, the equilibrium concentration of the products will be larger", this statement is true, but I'm a bit confused. Can someone please elaborate, can't the equilibrium constant favor the reactants?
by Jasmin Argueta 1K
Thu Jan 24, 2019 10:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: problem 5H1 7th edition part c
Replies: 1
Views: 32

problem 5H1 7th edition part c

Part c has the formula 2N2+6H2-->4NH3. The original problem is N2+3H2--->2NH3 with K=41, both are kept at a constant temperature and you must show their relation. I know you add two to get to your new formula, but don't understand why you would square 41 to get your new K. the answer is 1.7x10^3. Wh...
by Jasmin Argueta 1K
Thu Jan 24, 2019 10:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE problems
Replies: 5
Views: 87

ICE problems

In regards to doing ICE problems, I'm a bit confused for the "change" section. I know we are suppose to include coefficients on the x value if there is a molarity given, although how do you know if the x value is positive or negative?
by Jasmin Argueta 1K
Thu Jan 17, 2019 9:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE box
Replies: 2
Views: 40

ICE box

Unless otherwise stated are we suppose to assume we start with zero product when doing the ice box for the "initial" section.
by Jasmin Argueta 1K
Thu Jan 17, 2019 9:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating PH of weak acids and bases
Replies: 5
Views: 71

Calculating PH of weak acids and bases

The problem we did during lecture involved finding the ph and ionization of acetic acid in .10M CH3COOH , with K=1.8x10^-5. I was bit confused why we weren't suppose to use the quadratic equation, I heard the professor saying to omit this step since its a weak acid?
by Jasmin Argueta 1K
Thu Jan 17, 2019 9:19 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ATP hydrolysis
Replies: 1
Views: 58

ATP hydrolysis

During lecture we learned that ATP hydrolysis goes in the forward direction, although how is this possible If the physiological ATP concentration is 8.435x10^-3. Isn't the rule that if K<10^-3 then equilibrium lies to the left.
by Jasmin Argueta 1K
Thu Jan 10, 2019 10:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Temperature
Replies: 6
Views: 101

Temperature

During lecture it was stated that if we know the equlirium constant before the reaction, then we know the reverse as long as the temperature is still the same, Why must temperature remain the same? is it because evaporation factors?
by Jasmin Argueta 1K
Thu Jan 10, 2019 10:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Molar concentration
Replies: 1
Views: 31

Molar concentration

During lecture professor lavelle stated that molar concentration of a pure substance (solid or liquid) does not change in a reaction. Do the concentrations of products and reactants not change during a reaction? Can someone please elaborate, also the part about liquid being a solvent and its concent...
by Jasmin Argueta 1K
Thu Jan 10, 2019 9:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q and K
Replies: 13
Views: 153

Q and K

I know a few people already asked, but I am still a bit confused. I know Q is the reaction quotient and K is the equilibrium constant. Although, I don't understand why they are calculated the same way how will K ever be greater or Q ever be greater. Because in our notes it states a smaller q means y...
by Jasmin Argueta 1K
Thu Dec 06, 2018 11:58 pm
Forum: Lewis Structures
Topic: Lewis structure of CNO
Replies: 1
Views: 79

Lewis structure of CNO

I drew the lewis structure for CNO- , with N being the central atom. Why is it the negative goes to the carbon rather than the Nitrogen? The correct lewis structure leaves you with a negative carbon, positive nitrogen, and negative oxygen. I understand the oxygen should be negative because its high ...
by Jasmin Argueta 1K
Thu Dec 06, 2018 11:55 pm
Forum: Electronegativity
Topic: Electronegativity vs ionization energy
Replies: 5
Views: 82

Electronegativity vs ionization energy

Electronegativity is the affinity for an atom to complete its octet. Whats the difference between this and ionization energy? I know both have the same trend
by Jasmin Argueta 1K
Thu Dec 06, 2018 11:53 pm
Forum: Naming
Topic: Naming
Replies: 3
Views: 68

Naming

For the compound potassium tetracyanonickelate (II) How do you know how many K's you're suppose to put outside the brackets and why does it go in the beginning rather than end.
by Jasmin Argueta 1K
Thu Nov 29, 2018 8:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 3
Views: 70

Lone pairs

Can anyone please explain why lone pairs create such a huge repulsion and move all other atoms downwards? The other atoms that move dow also have electrons in their valence shell so why don't they repel each other as strongly as the lone pairs does. For example SF
by Jasmin Argueta 1K
Thu Nov 29, 2018 8:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2F3 7th edition
Replies: 1
Views: 66

2F3 7th edition

For part B In this problem I noticed you can draw two lewis structures, one without resonance and one with. Each lewis structure gives you a different answer for the amount of sigma and pie bonds present. Would we be expected to do both or is one sufficient for the tests?
by Jasmin Argueta 1K
Thu Nov 29, 2018 6:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2e7 7th edition
Replies: 1
Views: 35

2e7 7th edition

For part C of this problem it is asking for the bond Angles of OSCl and ClSCl. Both have a steric number of four making them tetrahedral. Each has two lone pairs making them bent/angular. I thought having two lone pairs would make the answer "less than 109.5" but the book says "SLIGHT...
by Jasmin Argueta 1K
Thu Nov 29, 2018 5:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 44

Bond Angles

Could someone clear up the concept on bond angles? Question 2E7 in the 7th edition is asking how many bond angels there are in the molecule SOCl2, how would you go about figuring this out?
by Jasmin Argueta 1K
Thu Nov 29, 2018 12:41 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E17th edition
Replies: 1
Views: 46

2E17th edition

For part a of the problem it is asking If there can be any lone pairs for a molecule with a 120 degree angle. I would think no because adding any lone pairs would make the angle LESS than 120. Although, the answers is "must have lone pairs"
by Jasmin Argueta 1K
Thu Nov 29, 2018 12:38 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 7th edition 2E.1 mistake ?
Replies: 6
Views: 97

Re: 7th edition 2E.1 mistake ?

I'm also very confused. I thought adding any lone pairs would change the shape completely.
by Jasmin Argueta 1K
Fri Nov 16, 2018 12:00 am
Forum: Lewis Structures
Topic: Electron configuration
Replies: 3
Views: 71

Electron configuration

For the test question asking for the ground state configuration of [Ar]3d^104s^24p^3 I keep getting germanium +1 can someone please explain
by Jasmin Argueta 1K
Thu Nov 15, 2018 11:57 pm
Forum: Electronegativity
Topic: noble gases
Replies: 2
Views: 68

noble gases

Why don't the noble gases have high electronegativity? It's farther on the periodic table than oxygen
by Jasmin Argueta 1K
Thu Nov 15, 2018 11:52 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Shortcut
Replies: 4
Views: 153

Shortcut

What's the shortcut for formal charge? My PLF was teaching it but I was still a bit confused
by Jasmin Argueta 1K
Thu Nov 08, 2018 7:09 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Equation
Replies: 13
Views: 2499

Re: Formal Charge Equation

The shortcuts my PLF taught me was FC=sticks+dots around the molecule
by Jasmin Argueta 1K
Thu Nov 08, 2018 7:07 pm
Forum: Dipole Moments
Topic: Van der Waals forces
Replies: 2
Views: 78

Van der Waals forces

In regards to van der Waals forces, I know they are weak forces in neutral molecules, but how exactly do they have a force if they are neutral? We're not learning about this specifically in class, but I thought it'd be interesting/helpful to know.
by Jasmin Argueta 1K
Thu Nov 08, 2018 7:03 pm
Forum: Octet Exceptions
Topic: Octet vs formal charge
Replies: 16
Views: 304

Octet vs formal charge

What is more important, having your molecules have a formal charge of zero or a full octet?
by Jasmin Argueta 1K
Thu Nov 08, 2018 6:59 pm
Forum: Lewis Structures
Topic: Electron configuration
Replies: 2
Views: 52

Electron configuration

In regards to the question "what is the most likely charge for ions formed for Cd". The answer Is Cd+2 but I'm not sure how. I know the written out you get [kr]4d^105s^2, I'm not sure where to go from there
by Jasmin Argueta 1K
Thu Nov 01, 2018 9:04 pm
Forum: Lewis Structures
Topic: 7th edition 2b9
Replies: 3
Views: 57

Re: 7th edition 2b9

But how would that be figured out just being told potassium phosphide? There's no lone electrons when only being given a name only a structure
by Jasmin Argueta 1K
Thu Nov 01, 2018 8:58 pm
Forum: Lewis Structures
Topic: 7th edition 2b9
Replies: 1
Views: 41

7th edition 2b9

Another question regarding this problem for part b is in regards to the charge. In the book it shows a 3- on the outside of Phosphorus. To get formal charge you do valence-(lone+(shared/2)) When doing this is get 5-(6+(0/2))which gives you -1. So how is it 3-?
by Jasmin Argueta 1K
Thu Nov 01, 2018 8:49 pm
Forum: Lewis Structures
Topic: 7th edition 2b9
Replies: 3
Views: 57

7th edition 2b9

For problem 2B in the seventh edition I was wondering if we were suppose to know the formal charges of potassium and phosphorus just by being given the name of the compound? Do we figure that out through the name? If so, how? Thank you!
by Jasmin Argueta 1K
Mon Oct 29, 2018 11:24 pm
Forum: Properties of Light
Topic: Problem B9
Replies: 4
Views: 139

Re: Problem B9

Why aren't the 2 seconds taken into consideration in part A?
by Jasmin Argueta 1K
Mon Oct 29, 2018 11:12 pm
Forum: Properties of Light
Topic: b7
Replies: 2
Views: 134

Re: b7

For part b why would it be incorrect to multiply 1.31x10^20 (number of sodium atoms) by 2.99x10^8(speed of light) then divide by 589x10^-9m(wavelength given)? The equations is E=hc/wavelength. Why would this not work? I don't understand why you have to multiply by the number of sodium per photon
by Jasmin Argueta 1K
Mon Oct 29, 2018 10:38 pm
Forum: Properties of Light
Topic: Problem A15
Replies: 2
Views: 187

Problem A15

Can someone help me solve problem A15? I've been stuck on it for about 20 minutes. I tried using the equation deltaE=-hR(1/finialn^2---1/initialn^2). Then it didn't work so I used v=R(1/finialn^2---1/initialn^2) thats shown in the book. I understand n initial is 1 because Lyman but when I work the p...
by Jasmin Argueta 1K
Thu Oct 25, 2018 1:09 am
Forum: Properties of Light
Topic: b15
Replies: 2
Views: 104

b15

For part C of problem b15 I was wondering why you do 1.66x106^-17J plus 1/2mv^2. I thought the equation was E(k)=1/2mv^2. why are we adding 1.66x106^-17J?
by Jasmin Argueta 1K
Thu Oct 25, 2018 12:29 am
Forum: Properties of Light
Topic: Problem B9
Replies: 4
Views: 139

Problem B9

For problem B9 part B I don't understand the thought process behind multiplying 1.41x10^20(amount of moles per two seconds) by 1 mole then dividing by 6.022x10^23. I would have thought to use the amount of photons per ONE second not two seconds then multiply by 1 mole and divide by 6.022x10^23. Can ...
by Jasmin Argueta 1K
Wed Oct 24, 2018 11:46 pm
Forum: Properties of Light
Topic: b7
Replies: 2
Views: 134

b7

For problem B7 in the 7th edition I'm a bit confused. For part a it it mentions an excited sodium atom and we don't take into account the mass of the atom although in part b we do. Why is that? Also how do we covert sodium in part b into kilograms?
by Jasmin Argueta 1K
Sat Oct 20, 2018 12:44 pm
Forum: Properties of Light
Topic: Problem A9
Replies: 5
Views: 83

Re: Problem A9

Thank you everyone!
by Jasmin Argueta 1K
Sun Oct 14, 2018 7:14 pm
Forum: Properties of Light
Topic: Problem A9
Replies: 5
Views: 83

Problem A9

In the seventh edition problem A9 I am having trouble solving for the frequency for 2.5nm . I tried using using the equation h(wavelength)v=c. I just rearagned it and did v=c/h. So I did v=(2.998x10^8)/2.5. The book says the answer is 1.2x10^17 HZ. I'm not sure how, do you covert 2.5 nm to meters, i...
by Jasmin Argueta 1K
Fri Oct 12, 2018 1:06 am
Forum: Molarity, Solutions, Dilutions
Topic: E23 part b
Replies: 4
Views: 145

E23 part b

The question E23 part says "Calculate the amount (in moles) of (a) Cu^2 ions in 3g of CuBr2 (b) SO3 molecules in 7.00x10^2mg of SO3" For part b I'm a bit confused. I got the right answer but thought we were suppose to convert 0.00874 moles into molecules since it said "SO3 molecules&q...
by Jasmin Argueta 1K
Fri Oct 12, 2018 1:01 am
Forum: Molarity, Solutions, Dilutions
Topic: memorizing [ENDORSED]
Replies: 4
Views: 173

Re: memorizing [ENDORSED]

Thank you! All very helpful
by Jasmin Argueta 1K
Thu Oct 11, 2018 11:44 pm
Forum: Molarity, Solutions, Dilutions
Topic: memorizing [ENDORSED]
Replies: 4
Views: 173

memorizing [ENDORSED]

Does anyone have any tips on memorizing the formulas? It'd be a big help. The formulas not matching the first letter of the words can be very tricky (i.e. N(atoms)=n(moles)Na(6.022/10^23)
by Jasmin Argueta 1K
Thu Oct 11, 2018 10:11 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula M1V1=M2V2 [ENDORSED]
Replies: 5
Views: 826

Formula M1V1=M2V2 [ENDORSED]

The formula M1V1=M2V2 was not in the text, is that correct? For problem G13 it seems much easier to use that formula but shows another way in the text. We just know to use it when we are given say, 2 volumes and one molarity for instance?
by Jasmin Argueta 1K
Wed Oct 10, 2018 5:36 pm
Forum: Molarity, Solutions, Dilutions
Topic: Textbook formula
Replies: 1
Views: 121

Textbook formula

I've been reading over section G in the 7th edition and came across the formula m=cMV. I understand all prior formulas but can't conceptualize how this one was derived. It states "First write n=m/M, then the equation 2a(n=cxV) becomes m/M=cV, and therefore, after multiplying both sides by M, yo...
by Jasmin Argueta 1K
Thu Oct 04, 2018 9:33 pm
Forum: Empirical & Molecular Formulas
Topic: Compound Names
Replies: 9
Views: 284

Re: Compound Names

I was wondering the same thing, but I think the professor said we won't be having to learn how to name compounds until later in the quarter and that we'll start picking them up anyways as time goes on. This is most likely practice for now.
by Jasmin Argueta 1K
Thu Oct 04, 2018 9:31 pm
Forum: Limiting Reactant Calculations
Topic: Calculating reactant moles [ENDORSED]
Replies: 4
Views: 89

Re: Calculating reactant moles [ENDORSED]

Do you have a problem you would like help with? Maybe running through the steps with numbers will help when explaining.
by Jasmin Argueta 1K
Thu Oct 04, 2018 1:22 pm
Forum: Molarity, Solutions, Dilutions
Topic: Problem G5
Replies: 8
Views: 174

Re: Problem G5

From my understanding you are using the M1V1=M2V2 equation. Just keep in mind that they give you 2.15 mmoles NA+ which is M2*V2. 2.15 mmoles is what you get when you multiples Moles/liter(M1)* liter(V2). The liters cancel out and you're left with M1V2=2.15mmoles. I hope this helps!
by Jasmin Argueta 1K
Tue Oct 02, 2018 11:45 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Excercise F13
Replies: 2
Views: 54

Excercise F13

I was figuring out problem F13, which regards solving for the empirical formula. The way I solved the problem was the same way Professor Lavelle did in class, figuring out the percent compositions of Phosphorus(14.89%) and Chlorine(85.1%). After I found the moles of phosphorus(.48 moles) and chlorin...

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