Search found 71 matches

by Noh_Jasmine_1J
Tue Mar 12, 2019 5:24 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow vs Fast Step
Replies: 4
Views: 68

Re: Slow vs Fast Step

the slow step usually has the same rate as the observed rate
by Noh_Jasmine_1J
Tue Mar 12, 2019 5:24 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Slow or Fast Step
Replies: 3
Views: 61

Re: Slow or Fast Step

the reaction rate that matches the experimental rate is the slow step.
by Noh_Jasmine_1J
Tue Mar 12, 2019 5:22 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: catalyst and equilibrium constant
Replies: 2
Views: 43

catalyst and equilibrium constant

if a catalyst affects the rate constant and rate constants of forward and reverse reactions can be used to find equilibrium constant then why does the catalyst not affect the equilibrium constant?
by Noh_Jasmine_1J
Tue Mar 05, 2019 3:54 pm
Forum: General Rate Laws
Topic: overall reaction rate
Replies: 2
Views: 59

overall reaction rate

what is the overall reaction rate used for?
by Noh_Jasmine_1J
Tue Mar 05, 2019 3:52 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Reaction order
Replies: 4
Views: 80

Re: Reaction order

you can find that by adding all the individual reaction orders together
by Noh_Jasmine_1J
Tue Mar 05, 2019 3:51 pm
Forum: General Rate Laws
Topic: how to calculate reaction rates
Replies: 2
Views: 51

how to calculate reaction rates

what are the different ways that we can calculate reaction rates?
by Noh_Jasmine_1J
Tue Feb 26, 2019 2:05 pm
Forum: Balancing Redox Reactions
Topic: Br2(l)-->Br^-(aq)
Replies: 1
Views: 32

Br2(l)-->Br^-(aq)

how can you tell that Br2(l)-->Br^-(aq) is a reduction? what would the oxidation numbers be?
by Noh_Jasmine_1J
Tue Feb 26, 2019 2:04 pm
Forum: Balancing Redox Reactions
Topic: oxidized vs oxidizing agent
Replies: 3
Views: 46

oxidized vs oxidizing agent

what is the difference between oxidized and oxidizing agent?
by Noh_Jasmine_1J
Tue Feb 26, 2019 2:04 pm
Forum: Balancing Redox Reactions
Topic: balancing basic half reactions
Replies: 1
Views: 23

balancing basic half reactions

why do we balance H with H2O in basic rxns instead of just OH to begin with?
by Noh_Jasmine_1J
Wed Feb 20, 2019 3:55 pm
Forum: Van't Hoff Equation
Topic: when to use
Replies: 4
Views: 74

when to use

when do we want to use the Van't Hoff equation?
by Noh_Jasmine_1J
Wed Feb 20, 2019 3:54 pm
Forum: Van't Hoff Equation
Topic: Non-consistant enthalpy
Replies: 3
Views: 86

Re: Non-consistant enthalpy

delta H and delta S should be consistent values to use this equation
by Noh_Jasmine_1J
Wed Feb 20, 2019 3:52 pm
Forum: Balancing Redox Reactions
Topic: how to balance
Replies: 5
Views: 76

how to balance

do you balance redox rxns by oxidation number or stoichiometry?
by Noh_Jasmine_1J
Thu Feb 14, 2019 3:28 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Cp,m
Replies: 5
Views: 176

Re: Cp,m

Cp is for constant pressure and can be used in solving for q or delta S.
Cv is for constant volume in the same equations
by Noh_Jasmine_1J
Mon Feb 11, 2019 3:18 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 3/2R and 5/2R
Replies: 2
Views: 44

3/2R and 5/2R

do you use 3/2R and 5/2R when calculating change in entropy when there is a temperature change? are there any other situations where you would use them?
by Noh_Jasmine_1J
Mon Feb 11, 2019 3:00 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: bond enthalpies
Replies: 3
Views: 55

bond enthalpies

do you only use gases when solving with bond enthalpies or can you use solids and liquids as well?
by Noh_Jasmine_1J
Thu Feb 07, 2019 12:12 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: ΔH
Replies: 2
Views: 68

ΔH

I thought when we calculated for ΔH, the equation used was ΔH=nCΔT, but in some calculations they don't use ΔT. Why is that?
by Noh_Jasmine_1J
Wed Feb 06, 2019 8:28 pm
Forum: Calculating Work of Expansion
Topic: Isothermal processes
Replies: 2
Views: 53

Re: Isothermal processes

isothermal means that the temperature stays the same and I believe that is the right equation to use when solving those types of problems
by Noh_Jasmine_1J
Tue Feb 05, 2019 3:00 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: 4.15 (7th edition)
Replies: 2
Views: 67

4.15 (7th edition)

for 4.15 in the 7th edition book, the balanced chemical equation is 2HCl(aq)+Zn(s)--->H2(g)+ZnCl2(aq) and it tells you that a piece of zinc metal of mass 8.5 g is dropped into an apparatus containing 800.0ml of 0.5M HCl(aq). If the initial temp of the HCl acid solution is 25C, what is the final temp...
by Noh_Jasmine_1J
Tue Feb 05, 2019 1:15 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: ΔH and ΔU
Replies: 6
Views: 112

ΔH and ΔU

what does the degree symbol mean in the equation ΔU°=ΔH°+W
by Noh_Jasmine_1J
Wed Jan 30, 2019 2:08 pm
Forum: Calculating Work of Expansion
Topic: Units for Work
Replies: 6
Views: 76

Re: Units for Work

Units for work is in Joules and 1J is equal to kg*m^2*s^-2
by Noh_Jasmine_1J
Tue Jan 29, 2019 9:59 am
Forum: Calculating Work of Expansion
Topic: reversible process
Replies: 3
Views: 64

reversible process

is the value for R in the equation w=-nRTln(V2/V1) always the same?
by Noh_Jasmine_1J
Tue Jan 29, 2019 9:50 am
Forum: Calculating Work of Expansion
Topic: 4A.3 7th Ed
Replies: 6
Views: 76

4A.3 7th Ed

how do I figure out how to determine the change in volume when I am solving for work done? the question asks to solve for the work of a pump in compression with a diameter of 3cm and the pump is depressed 20cm with a pressure of 2atm. thank you~
by Noh_Jasmine_1J
Thu Jan 24, 2019 11:28 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pH vs pKa
Replies: 3
Views: 62

pH vs pKa

what is the difference between pH and pKa? how would you solve for pKa if given pH?
by Noh_Jasmine_1J
Tue Jan 22, 2019 8:45 am
Forum: Ideal Gases
Topic: ICE table
Replies: 5
Views: 169

ICE table

for gases in ICE table, do we still use concentration (mol/l) or use bar?
by Noh_Jasmine_1J
Tue Jan 22, 2019 8:45 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating with Salts
Replies: 1
Views: 34

Calculating with Salts

if you're calculating with salts, how do you know what part of the equation you don't need to add in finding out values for K or Q?
by Noh_Jasmine_1J
Tue Jan 22, 2019 8:43 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Exothermic vs Endothermic
Replies: 4
Views: 75

Exothermic vs Endothermic

I know that you can figure out which way the rxn will favor if you know whether it's endothermic or exothermic, but how can you figure that out?
by Noh_Jasmine_1J
Tue Jan 15, 2019 11:12 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 7th edition 6B.3
Replies: 1
Views: 38

7th edition 6B.3

I don't understand how to do part (b) of 6B.3 in the 7th edition with the 200ml value and 250ml value
by Noh_Jasmine_1J
Tue Jan 15, 2019 11:11 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Calculating Equilibrium values
Replies: 2
Views: 38

Calculating Equilibrium values

Do you have to figure out which direction the reaction goes before doing ICE table?
by Noh_Jasmine_1J
Tue Jan 15, 2019 11:10 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE charts
Replies: 3
Views: 46

ICE charts

In ICE charts can you fill in the chart with different units of measurement? Ex moles, mol/L, grams
by Noh_Jasmine_1J
Wed Jan 09, 2019 4:20 pm
Forum: Ideal Gases
Topic: use
Replies: 8
Views: 89

Re: use

Noh_Jasmine_1G wrote:when do you use this equation?

forgot to write the equation haha. its the partial pressure equation
by Noh_Jasmine_1J
Wed Jan 09, 2019 4:19 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: solving for equilibrium constants
Replies: 3
Views: 29

solving for equilibrium constants

when solving for the equilibrium constant using gases, can you use either mol/L or in bar?
by Noh_Jasmine_1J
Wed Jan 09, 2019 4:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: [Cl2] vs (PCl2)
Replies: 1
Views: 25

[Cl2] vs (PCl2)

what is the difference between [Cl2] vs (PCl2) and what does the brackets mean compared to the parenthesis with P in them?
by Noh_Jasmine_1J
Wed Jan 09, 2019 4:15 pm
Forum: Ideal Gases
Topic: use
Replies: 8
Views: 89

use

when do you use this equation?
by Noh_Jasmine_1J
Tue Dec 04, 2018 8:06 pm
Forum: Bronsted Acids & Bases
Topic: Acetic acid vs Formic acid
Replies: 1
Views: 47

Acetic acid vs Formic acid

Why is formic acid a stronger acid than acetic acid? Formic acid has a -CH3 group and acetic acid is HCOOH.
by Noh_Jasmine_1J
Tue Dec 04, 2018 7:59 pm
Forum: Naming
Topic: Writing formulas
Replies: 2
Views: 31

Writing formulas

How do you write the chemical formula for coordinations compounds? Are they alphabetical?
by Noh_Jasmine_1J
Tue Dec 04, 2018 7:57 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate
Replies: 1
Views: 42

Polydentate

How can you tell if something is polydentate or not? Are you always given a drawing or do you have to figure it out by the chemical formula?
by Noh_Jasmine_1J
Sat Dec 01, 2018 6:24 pm
Forum: Amphoteric Compounds
Topic: acidic, basic, and amphoteric oxides
Replies: 2
Views: 76

acidic, basic, and amphoteric oxides

can someone explain what acidic, basic, and amphoteric oxides are? I didn't understand the book's definition of it
by Noh_Jasmine_1J
Mon Nov 26, 2018 4:45 pm
Forum: Hybridization
Topic: hybrid orbitals
Replies: 1
Views: 48

hybrid orbitals

if a hybrid orbital is created, does that mean there is only one electron per energy level?
by Noh_Jasmine_1J
Mon Nov 26, 2018 4:40 pm
Forum: Hybridization
Topic: multiple bonds: pi and sigma bonds
Replies: 1
Views: 32

multiple bonds: pi and sigma bonds

How do you know if one of the orbitals is hybridized or not?
by Noh_Jasmine_1J
Mon Nov 26, 2018 4:33 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: sigma and pi bonds
Replies: 4
Views: 90

Re: sigma and pi bonds

sigma bonds are located on the axis and so they are able to rotate around it, but pi bonds are located above and below the axis and therefore cannot rotate
by Noh_Jasmine_1J
Wed Nov 21, 2018 7:42 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 5
Views: 71

Molecular Shape

for the names of the different shapes, is the only way to learn them is to memorize the names of the shapes that correspond to the AXE form?
by Noh_Jasmine_1J
Wed Nov 21, 2018 7:41 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Organizing atoms around central atom
Replies: 1
Views: 23

Organizing atoms around central atom

for SO2Cl2, do the 2 oxygens and 2 chlorines have to be next to each other around the sulfur or can they be directly across from each other?
by Noh_Jasmine_1J
Wed Nov 21, 2018 7:40 am
Forum: Hybridization
Topic: hybridization with bonds
Replies: 2
Views: 48

hybridization with bonds

how can you tell the type of bond (pi or sigma) with knowing the hybridization?
by Noh_Jasmine_1J
Wed Nov 14, 2018 1:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 72

Re: Bond Angles

Lone pairs have greater repulsion than bonds and therefore cause the bond angles to be smaller than expected
by Noh_Jasmine_1J
Wed Nov 14, 2018 1:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron density
Replies: 6
Views: 111

Electron density

does electron density only refer to the central atom? and is the electron density around the central atom the only one we use to determine molecular shape?
by Noh_Jasmine_1J
Wed Nov 14, 2018 8:59 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 4
Views: 79

Bond Angles

do we just have to memorize the bond angles for different molecular shapes?
by Noh_Jasmine_1J
Tue Nov 06, 2018 2:35 pm
Forum: Ionic & Covalent Bonds
Topic: Greater Ionic Character? [ENDORSED]
Replies: 3
Views: 102

Re: Greater Ionic Character? [ENDORSED]

usually the distance between the 2 atoms will be useful. if they are further apart that means they will have greater ionic character because the electronegativity is greater
by Noh_Jasmine_1J
Tue Nov 06, 2018 2:33 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge of Oxygen
Replies: 6
Views: 136

Formal Charge of Oxygen

why does oxygen usually have the negative formal charge in a lewis structure compared to carbon?
by Noh_Jasmine_1J
Tue Nov 06, 2018 2:31 pm
Forum: Ionic & Covalent Bonds
Topic: O vs N [ENDORSED]
Replies: 4
Views: 85

O vs N [ENDORSED]

why does Oxygen have lower ionization energy than Nitrogen ?
by Noh_Jasmine_1J
Sun Nov 04, 2018 12:41 pm
Forum: Ionic & Covalent Bonds
Topic: Be vs Mg
Replies: 1
Views: 51

Be vs Mg

why are the electron affinities for Be and Mg the same when Mg is below Be? I thought electron affinity increases as you go right and up
by Noh_Jasmine_1J
Wed Oct 31, 2018 9:19 am
Forum: Electronegativity
Topic: Periodic Trends [ENDORSED]
Replies: 3
Views: 128

Periodic Trends [ENDORSED]

why does electronegativity, electron affinity, and ionization energy all increase to the right?
by Noh_Jasmine_1J
Tue Oct 30, 2018 9:52 pm
Forum: Lewis Structures
Topic: How to determine central atom
Replies: 8
Views: 163

How to determine central atom

hi, how do I determine the central atom of a lewis structure?
by Noh_Jasmine_1J
Tue Oct 30, 2018 9:48 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Energy and Stability of an Atom
Replies: 2
Views: 87

Energy and Stability of an Atom

why does lower energy mean that an atom is more stable?
by Noh_Jasmine_1J
Mon Oct 29, 2018 6:33 pm
Forum: Lewis Structures
Topic: Lewis Structure for Compounds
Replies: 2
Views: 72

Lewis Structure for Compounds

how do you know to draw two separate lewis structures for ammonium sulfate and just one for glycine (H2O(NH2)COOH)?
by Noh_Jasmine_1J
Tue Oct 23, 2018 2:42 pm
Forum: Einstein Equation
Topic: λ=h/p vs λ=hc/E
Replies: 6
Views: 365

λ=h/p vs λ=hc/E

Hi, I am confused on when to use the equation λ=h/p vs λ=hc/E or if they are interchangeable. thank you so much !
by Noh_Jasmine_1J
Mon Oct 22, 2018 2:23 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electrostatic attraction for multi-electron atoms
Replies: 1
Views: 19

Electrostatic attraction for multi-electron atoms

hi, i'm confused on what shielding does to the s, p, d, and f orbitals. I know that p has greater energy than s but is this talking about the electrons energy being closer to zero? also how does all of this relate to the equation: E is proportionate to (q1)(q2)/r ?
by Noh_Jasmine_1J
Mon Oct 22, 2018 2:17 pm
Forum: Properties of Electrons
Topic: Difference between electron's particle like and wave like characteristics
Replies: 5
Views: 184

Difference between electron's particle like and wave like characteristics

Hi, could someone clarify the characteristics that make an electron act like both a particle and wave?
by Noh_Jasmine_1J
Mon Oct 22, 2018 2:12 pm
Forum: *Shrodinger Equation
Topic: How Schrodinger Equation Relates to Atomic Orbitals
Replies: 1
Views: 137

How Schrodinger Equation Relates to Atomic Orbitals

Hi, I am confused on how we make the connection between the Schrodinger Equation and the determination of atomic orbitals. Could someone explain it to me?
by Noh_Jasmine_1J
Tue Oct 16, 2018 2:50 pm
Forum: Einstein Equation
Topic: Question regarding wavelength
Replies: 5
Views: 90

Re: Question regarding wavelength

angelagd3l wrote:what units are we using while working with wavelengths?


wavelengths are usually given in meters but usually you can switch it by a power of 10 to make nanometers, picometers, etc to make the number friendlier
by Noh_Jasmine_1J
Tue Oct 16, 2018 2:46 pm
Forum: Properties of Light
Topic: E=hv
Replies: 13
Views: 203

Re: E=hv

Tamera Scott 3L wrote:I've also seen E=hf once, does anyone know if that is the same as E=hv?


v is the symbol for frequency, so both equations are equivalent
by Noh_Jasmine_1J
Tue Oct 16, 2018 2:44 pm
Forum: Properties of Light
Topic: Question 1B.7
Replies: 2
Views: 45

Re: Question 1B.7

I'm not completely sure but I think that the energy per atom can be found at the back of the textbook for the referencing during homework and should be given for a test.
by Noh_Jasmine_1J
Thu Oct 11, 2018 4:15 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Moles [ENDORSED]
Replies: 6
Views: 416

Re: Moles [ENDORSED]

This is just showing the ratio of the Fe to the compound for that specific chemical reaction. The molar ratio could be different for other reactions
by Noh_Jasmine_1J
Thu Oct 11, 2018 4:13 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: molar masses on the test
Replies: 7
Views: 256

Re: molar masses on the test

You can solve for the molar mass if the question gives you the chemical formula because there is a periodic table given for the test
by Noh_Jasmine_1J
Thu Oct 11, 2018 4:11 pm
Forum: Balancing Chemical Reactions
Topic: Where to start [ENDORSED]
Replies: 10
Views: 442

Re: Where to start [ENDORSED]

I usually start with the one that appears the least (usually only once) because then I don't have to search around and make sure I'm adding all the moles correctly. After starting with the least, I see which numbers would be easiest to match and go from there
by Noh_Jasmine_1J
Thu Oct 11, 2018 4:07 pm
Forum: Significant Figures
Topic: Rounding Using Significant Figures
Replies: 10
Views: 454

Re: Rounding Using Significant Figures

In multiplying and dividing you always use the smallest number of sig figs between those two numbers and in adding and subtracting you should use the smallest number after the decimal point. For example: 1.23 + 1.5 would be 2 sig figs because there is only one number after the decimal point in 1.5
by Noh_Jasmine_1J
Thu Oct 04, 2018 4:15 pm
Forum: Empirical & Molecular Formulas
Topic: chemical formulas
Replies: 4
Views: 117

chemical formulas

hi, I can confused on when to use subscripts for certain elements on the periodic table. For example, I don't know understand why chlorine gas is written as Cl2 instead of just Cl (M.15)
by Noh_Jasmine_1J
Thu Oct 04, 2018 12:58 pm
Forum: Limiting Reactant Calculations
Topic: chemical formula regarding M.9
Replies: 2
Views: 75

chemical formula regarding M.9

hi, I just had a question for M.9, which asks for us to write the net ionic equation for the reaction: copper(II) nitrate reacts with sodium hydroxide to produce a precipitate of light blue copper(II) hydroxide. what do the Roman numerals mean and how does NaNO3 appear on the products side out of no...
by Noh_Jasmine_1J
Wed Oct 03, 2018 5:14 pm
Forum: Empirical & Molecular Formulas
Topic: Fundamental L.39
Replies: 6
Views: 111

Re: Fundamental L.39

Hi. I have a question regarding this problem as well: why is the oxygen written as "O" without the subscript 2 until the formula is written? I though oxygen was always O2
by Noh_Jasmine_1J
Sun Sep 30, 2018 8:51 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass of Sulfide
Replies: 2
Views: 125

Molar Mass of Sulfide

Hi I have a question on E.15 (7th edition). It gives me the molar mass of a metal oxide M(OH)2 as 74.10 g/mol and asks me to find the molar mass of the sulfide. How do I make the connection between sulfide and (OH)2?
by Noh_Jasmine_1J
Sat Sep 29, 2018 8:09 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Equal Masses Between Two Atoms
Replies: 1
Views: 63

Re: Equal Masses Between Two Atoms

Update: I realized that the astatine atoms weren't on the pan and figured it out!
by Noh_Jasmine_1J
Sat Sep 29, 2018 7:51 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Equal Masses Between Two Atoms
Replies: 1
Views: 63

Equal Masses Between Two Atoms

Referring to question E.3, how do you know to increase astatine atoms by 3? It gives you 9 gallium atoms (molar mass 70 g/mol) and 9 astatine atoms (molar mass 210 g/mol) and asks how many astatine atoms are needed to make the masses equal.

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