Search found 52 matches

by snehabhargava
Sat Mar 17, 2018 8:50 pm
Forum: Phase Changes & Related Calculations
Topic: Delta T and Sig Figs
Replies: 1
Views: 243

Re: Delta T and Sig Figs

Yes, because they are measurements. Anything that is measured has to consider sig figs.
by snehabhargava
Sat Mar 17, 2018 8:48 pm
Forum: Balancing Redox Reactions
Topic: determining cathode from anode
Replies: 11
Views: 441

Re: determining cathode from anode

Check the standard cell potentials.
by snehabhargava
Sat Mar 17, 2018 8:47 pm
Forum: Balancing Redox Reactions
Topic: flipping the sign of anodes
Replies: 5
Views: 336

Re: flipping the sign of anodes

You should always flip it and then if is asks for standard cell potential for the entire cell you can add the standards for the anode and cathode. If you don't flip it then then you subtract the anode from the cathode.
by snehabhargava
Sat Mar 17, 2018 8:46 pm
Forum: Balancing Redox Reactions
Topic: Notation question
Replies: 2
Views: 196

Re: Notation question

The nitrogen goes from an overall -1 charge to a zero charge.
by snehabhargava
Mon Mar 12, 2018 6:05 pm
Forum: Zero Order Reactions
Topic: Half Lives? [ENDORSED]
Replies: 7
Views: 427

Re: Half Lives? [ENDORSED]

yes, because 1/4 is the half life of the half life.
by snehabhargava
Mon Mar 12, 2018 6:03 pm
Forum: Zero Order Reactions
Topic: zero order rate?
Replies: 14
Views: 524

Re: zero order rate?

That is definitely correct.
by snehabhargava
Mon Mar 12, 2018 6:03 pm
Forum: Zero Order Reactions
Topic: Zero order
Replies: 5
Views: 620

Re: Zero order

In a zero order reaction, the concentrations of the reactants does not effect the rate.
by snehabhargava
Wed Feb 28, 2018 9:26 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Units of Reaction Rate
Replies: 7
Views: 260

Re: Units of Reaction Rate

we do not need to know any constants for this test
by snehabhargava
Wed Feb 28, 2018 9:22 pm
Forum: General Rate Laws
Topic: Half life
Replies: 3
Views: 109

Re: Half life

They will be an equation given to us.
by snehabhargava
Wed Feb 28, 2018 9:17 pm
Forum: General Rate Laws
Topic: Average Rate of Consumption of R
Replies: 1
Views: 80

Re: Average Rate of Consumption of R

That means that more reactants are produced.
by snehabhargava
Mon Feb 26, 2018 7:06 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Value of k
Replies: 4
Views: 140

Re: Value of k

The value of k cannot be negative because the reaction rate cannot be negative and the relationship we know is based on the concentrations and time not of k because k is constant for every reaction at a constant pressure and temperature.
by snehabhargava
Mon Feb 26, 2018 7:04 pm
Forum: Zero Order Reactions
Topic: 15.9b
Replies: 2
Views: 121

Re: 15.9b

That is the concentration of the reactants and you are dividing by the concentration.
by snehabhargava
Mon Feb 26, 2018 7:02 pm
Forum: General Rate Laws
Topic: Reaction rates
Replies: 3
Views: 129

Re: Reaction rates

Because at the start there is no products formed so the only concentration you have is the one of the reactants
by snehabhargava
Thu Feb 22, 2018 12:06 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Oxidizing and Reducing Agents
Replies: 2
Views: 117

Re: Oxidizing and Reducing Agents

Look at the standard cell potentials.
by snehabhargava
Thu Feb 22, 2018 12:05 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: calculating n
Replies: 9
Views: 375

Re: calculating n

You look at the electrons transferred during the half reactions.
by snehabhargava
Thu Feb 22, 2018 12:04 am
Forum: Balancing Redox Reactions
Topic: Can solids have charges? [ENDORSED]
Replies: 4
Views: 240

Re: Can solids have charges? [ENDORSED]

No because they are not ionized
by snehabhargava
Mon Feb 12, 2018 11:11 am
Forum: Calculating Work of Expansion
Topic: When to use this equation
Replies: 4
Views: 156

Re: When to use this equation

That equation is used when the pressure is constant.
by snehabhargava
Mon Feb 12, 2018 11:09 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity
Replies: 2
Views: 93

Heat Capacity

When do you use the heat capacity of water vs. the heat capacity of ice?
by snehabhargava
Mon Feb 12, 2018 11:07 am
Forum: Phase Changes & Related Calculations
Topic: Units for Internal Energy
Replies: 5
Views: 168

Re: Units for Internal Energy

It can be either one. Just depends on the problem.
by snehabhargava
Sat Feb 03, 2018 8:41 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Assume ideal gas?
Replies: 4
Views: 143

Re: Assume ideal gas?

Yes, because it is an assumption to make calculations easier.
by snehabhargava
Sat Feb 03, 2018 8:30 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: ΔS(universe)
Replies: 6
Views: 226

Re: ΔS(universe)

The change in entropy of the universe is the same always.
by snehabhargava
Sat Feb 03, 2018 8:23 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: When to use Q versus K [ENDORSED]
Replies: 6
Views: 471

Re: When to use Q versus K [ENDORSED]

You use Q when the reaction is not at equilibrium and use K when the reaction is at equilibrium.
by snehabhargava
Sun Jan 28, 2018 7:13 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Example 9.2
Replies: 2
Views: 97

Re: Example 9.2

It uses Cv,m because there is a constant volume so they can use that heat capacity.
by snehabhargava
Sun Jan 28, 2018 7:12 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Reversible vs. Irreversible
Replies: 3
Views: 110

Reversible vs. Irreversible

What is the difference between reversible and irreversible expansion?
by snehabhargava
Sun Jan 28, 2018 7:10 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: What is the difference between internal energy and molar internal energy? [ENDORSED]
Replies: 2
Views: 379

Re: What is the difference between internal energy and molar internal energy? [ENDORSED]

Internal energy is the total amount of energy in a system. The molar internal energy is the energy of the system per mole.
by snehabhargava
Sun Jan 21, 2018 10:14 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies
Replies: 7
Views: 257

Re: Bond Enthalpies

Because when the bond enthalpy is less it takes less energy to break therefore, it is less stable. Bonds that take more energy are more stable because more energy is need to break the bonds.
by snehabhargava
Sun Jan 21, 2018 10:12 pm
Forum: Phase Changes & Related Calculations
Topic: About phase change for methane in the combustion reaction
Replies: 2
Views: 149

Re: About phase change for methane in the combustion reaction

No, you assume that the water is in the liquid state the entire time.
by snehabhargava
Sun Jan 21, 2018 10:11 pm
Forum: Phase Changes & Related Calculations
Topic: What mass of SO2 must be evaporated?
Replies: 1
Views: 443

Re: What mass of SO2 must be evaporated?

Yup. You would convert kcal to kj and mass to moles.
by snehabhargava
Mon Jan 15, 2018 5:15 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Enthalpy
Replies: 2
Views: 138

Re: Enthalpy

The reverse will be exothermic because it will have a negative enthalpy.
by snehabhargava
Mon Jan 15, 2018 5:13 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 3
Views: 142

Re: Hess's Law

Hess's Law allows you to calculate enthalpy using products and reactants.
by snehabhargava
Mon Jan 15, 2018 5:10 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Ch. 8 #15 Part d
Replies: 2
Views: 155

Re: Ch. 8 #15 Part d

This is true when w=0 because q has to be 0 so it is only true when both q is 0 and w is 0.
by snehabhargava
Wed Dec 06, 2017 10:04 pm
Forum: Bronsted Acids & Bases
Topic: Net Ionic Equations
Replies: 2
Views: 251

Re: Net Ionic Equations

In a net ionic equation, you only write what is actually reacting. For example, if you put the salt NaF in water it would completely dissociate but the Na+ will not react with anything. So the net ionic equation would be F- + H20 <--> HF + OH- instead of F- + H20 + Na+ <--> HF + OH- + Na+.
by snehabhargava
Sun Dec 03, 2017 3:55 pm
Forum: Bronsted Acids & Bases
Topic: Identifying Bronsted Acids and Bases [ENDORSED]
Replies: 3
Views: 196

Re: Identifying Bronsted Acids and Bases [ENDORSED]

A bronsted acid usually has a H+ that will be donated while a bronsted acid will usually have an OH- it will donate.
by snehabhargava
Fri Dec 01, 2017 11:09 am
Forum: Lewis Acids & Bases
Topic: Lewis Structure
Replies: 3
Views: 259

Re: Lewis Structure

The lewis structure of a lewis acid will not have a lone pair while an lewis base will have a lone pair to donate.
by snehabhargava
Fri Dec 01, 2017 11:05 am
Forum: Ideal Gases
Topic: Temperature in PV=nRT
Replies: 9
Views: 511

Re: Temperature in PV=nRT

The standard units for temperature is Kelvin (K)
by snehabhargava
Mon Nov 27, 2017 12:20 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant units
Replies: 2
Views: 154

Re: Equilibrium Constant units

It does not have units because it is just a ratio and ratios do not have units.
by snehabhargava
Mon Nov 20, 2017 11:29 pm
Forum: Naming
Topic: bisoxalato
Replies: 1
Views: 80

bisoxalato

What does bisoxalato mean?
by snehabhargava
Fri Nov 17, 2017 11:07 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs Angular
Replies: 7
Views: 326

Re: Bent vs Angular

The word angular and bent mean the exact same thing. Don’t worry about when to use either. They are the same.
by snehabhargava
Fri Nov 17, 2017 11:06 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs Angular
Replies: 7
Views: 326

Re: Bent vs Angular

The word angular and bent mean the exact same thing. Don’t worry about when to use either. They are the same.
by snehabhargava
Fri Nov 17, 2017 11:02 am
Forum: Hybridization
Topic: Triple bond sigma vs. pi
Replies: 3
Views: 134

Re: Triple bond sigma vs. pi

A triple bond contains 1 sigma and 2 pi bonds because only one sigma bond can be created between 2 molecules so the other 2 have to be pi bonds.
by snehabhargava
Wed Nov 08, 2017 5:37 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Sulfur Dioxide?
Replies: 3
Views: 247

Re: Sulfur Dioxide?

A sulfur dioxide molecule is always changing so in reality it is a blend of all 3 but it is in the state with the lowest formal charge the majority of the time.
by snehabhargava
Wed Nov 08, 2017 5:35 pm
Forum: Lewis Structures
Topic: Lewis Structure of N2O
Replies: 2
Views: 213

Re: Lewis Structure of N2O

The structure with oxygen have a -1 charge is the most stable because oxygen is already very electronegative. It is the one with the lowest energy.
by snehabhargava
Sun Nov 05, 2017 10:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lewis Structures
Replies: 6
Views: 258

Re: Lewis Structures

This is the actually shape of the orbital with a 3d shape. It has been determined by flashing light.
by snehabhargava
Sun Nov 05, 2017 10:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Formal charge and lewis structures
Replies: 5
Views: 217

Re: Formal charge and lewis structures

I do not think you have to draw all of the possible ones. If the first one you draw has a formal charge of 0 then you don't have to draw anymore.
by snehabhargava
Sat Oct 28, 2017 2:45 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Determining valence electrons for d-block elements [ENDORSED]
Replies: 3
Views: 899

Re: Determining valence electrons for d-block elements [ENDORSED]

We are only considered with the valence shell electrons so that is the s and p orbitals and we will only be working with those.
by snehabhargava
Sat Oct 28, 2017 2:40 pm
Forum: Trends in The Periodic Table
Topic: atomic size
Replies: 4
Views: 227

Re: atomic size

yes I agree, elements on the top left are smaller than elements on the bottom right side of the periodic table.
by snehabhargava
Fri Oct 20, 2017 10:08 am
Forum: Photoelectric Effect
Topic: Photoelectric Effect as Proof of Particle Qualities of Light
Replies: 3
Views: 236

Re: Photoelectric Effect as Proof of Particle Qualities of Light

It is proved by the fact that when you increase the intensity, there is no change. That means that it is dependent on the individual particle and not on the wave as a whole.
by snehabhargava
Fri Oct 20, 2017 10:05 am
Forum: Photoelectric Effect
Topic: Rydberg
Replies: 11
Views: 596

Re: Rydberg

When using Rydberg's equation, the frequency cannot be negative. To avoid this you put whatever the higher of the 2 energy levels for n1.
by snehabhargava
Fri Oct 13, 2017 11:15 am
Forum: Einstein Equation
Topic: Lyman and Blamer series [ENDORSED]
Replies: 7
Views: 626

Re: Lyman and Blamer series [ENDORSED]

You can determine what series it is by the smallest energy level so if n1 is 1 and n2 is 3, it is still a Lyman series and if n1 is 2 and n2 is 6, it is still a Balmer series.
by snehabhargava
Fri Oct 13, 2017 11:12 am
Forum: Properties of Light
Topic: Speed of Light Constant
Replies: 18
Views: 665

Re: Speed of Light Constant

When it comes to constants, use the sig figs that are given in the problem to determine how many values past the decimal point to us in the speed of light constant or plank's constant.
by snehabhargava
Thu Oct 05, 2017 8:06 pm
Forum: Significant Figures
Topic: Significant Figures of Conversion Factors [ENDORSED]
Replies: 3
Views: 548

Re: Significant Figures of Conversion Factors [ENDORSED]

The conversion factors do not count for sig figs because they are exact values and are not measurements that is why it does not matter.
by snehabhargava
Thu Oct 05, 2017 7:53 pm
Forum: Significant Figures
Topic: E29 (d) Significant Figures
Replies: 3
Views: 314

Re: E29 (d) Significant Figures

This is a mistake in the solution manual. You should use the sig. figs. that are given in the question and not from the periodic table because the periodic table can vary.

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