Search found 72 matches

by Naneeta_Desar_1K
Mon Feb 10, 2020 12:49 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Stability and Bond Enthalpy
Replies: 3
Views: 16

Re: Stability and Bond Enthalpy

I believe that when the bond enthalpy is higher, the bond is stronger.
by Naneeta_Desar_1K
Sat Feb 08, 2020 4:38 pm
Forum: Phase Changes & Related Calculations
Topic: Steam burns more than water
Replies: 5
Views: 48

Re: Steam burns more than water

Since steam has a higher energy than water, it burns more.
by Naneeta_Desar_1K
Sun Feb 02, 2020 8:42 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Quadratic Equation
Replies: 5
Views: 25

Re: Quadratic Equation

https://www.khanacademy.org/math/algebr ... ula-review

This article is helpful in reviewing the quadratic formula! Check it out :)


by Naneeta_Desar_1K
Sun Feb 02, 2020 2:50 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Phase change
Replies: 20
Views: 47

Re: Phase change

Delta H is positive since melting is breaking bonds and energy is required in order to do so.
by Naneeta_Desar_1K
Sun Feb 02, 2020 2:40 pm
Forum: Calculating Work of Expansion
Topic: Homework Textbook
Replies: 1
Views: 10

Re: Homework Textbook

Here you go!
by Naneeta_Desar_1K
Sun Feb 02, 2020 2:32 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Elements
Replies: 8
Views: 23

Re: Elements

It is because since molecules such as O2 and N2 are readily discovered in this state the enthalpy of formation is 0 kJ/mol.
by Naneeta_Desar_1K
Sun Feb 02, 2020 2:27 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: pressure v. volume
Replies: 3
Views: 14

Re: pressure v. volume

With constant pressure and no change in volume delta U= delta H. Also when there is no change in pressure and constant volume delta U= delta H.
by Naneeta_Desar_1K
Sun Feb 02, 2020 2:24 pm
Forum: Ideal Gases
Topic: pv=nrt
Replies: 9
Views: 35

Re: pv=nrt

Yes, p,v,n, and t are all variable while r is constant. It just depends on what information the question provides for you.
by Naneeta_Desar_1K
Sun Feb 02, 2020 2:22 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: residual entropy
Replies: 4
Views: 19

Re: residual entropy

It is the difference between the entropy not at equilibrium and crystal state of a substance close to absolute zero.
by Naneeta_Desar_1K
Sun Jan 26, 2020 12:24 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: State Property & State Function
Replies: 1
Views: 11

Re: State Property & State Function

A state property is an entity that does not depend on how the substance was prepared. State function is another way to indicate a state property
by Naneeta_Desar_1K
Sun Jan 26, 2020 12:21 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Negative Square Root solving an ICE box
Replies: 13
Views: 31

Re: Negative Square Root solving an ICE box

Having a negative square root would not make sense in the context of the problem therefore you should check your previous work to see if you have made a mistake.
by Naneeta_Desar_1K
Mon Jan 20, 2020 11:36 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kw temperature
Replies: 8
Views: 27

Re: Kw temperature

Room temperature, approximately 25°C
by Naneeta_Desar_1K
Mon Jan 20, 2020 12:46 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Le Chatelier's principle
Replies: 7
Views: 26

Re: Le Chatelier's principle

This principle basically explains that the reaction will favor one side (either the products or the reactants) and how the reaction will continue when an additional condition is placed on the reaction at equilibrium.
by Naneeta_Desar_1K
Mon Jan 20, 2020 12:40 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure changes
Replies: 7
Views: 23

Re: Pressure changes

If the pressure is increased then the reaction will favor the side where there are less moles of either the products or the reactants.
by Naneeta_Desar_1K
Mon Jan 20, 2020 12:38 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: ice table
Replies: 5
Views: 18

Re: ice table

The ICE table can include solids and liquids however the values will be 0 since they are not included in the equilibrium constant equation so they're impact is negligible.
by Naneeta_Desar_1K
Mon Jan 20, 2020 12:36 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding a catalyst
Replies: 7
Views: 26

Re: Adding a catalyst

In addition, adding a catalyst does not affect the amount of free energy (G) in the reaction.
by Naneeta_Desar_1K
Mon Jan 20, 2020 12:35 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: q vs k
Replies: 9
Views: 15

Re: q vs k

Yes Q is the value calculated when the reaction is not at equilibrium.
by Naneeta_Desar_1K
Mon Jan 20, 2020 12:34 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ATP hydrolysis [ENDORSED]
Replies: 3
Views: 29

Re: ATP hydrolysis [ENDORSED]

I'm not sure what exact details we have to know but in general, ATP hydrolysis is exergonic because there is less free energy in the products than the reactants.
by Naneeta_Desar_1K
Mon Jan 13, 2020 10:46 pm
Forum: Ideal Gases
Topic: When to use this equation
Replies: 14
Views: 70

Re: When to use this equation

This equation is the ideal gas equation and should be used when you want to convert the concentration to pressure or vice versa.
by Naneeta_Desar_1K
Mon Jan 13, 2020 10:41 pm
Forum: Administrative Questions and Class Announcements
Topic: Are Lectures Bruincasted?
Replies: 10
Views: 60

Re: Are Lectures Bruincasted?

The modules have very similar information to his lectures so review the modules if you are unclear with a certain topic!
by Naneeta_Desar_1K
Mon Jan 13, 2020 10:40 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Studying tips
Replies: 10
Views: 29

Re: Studying tips

Review your notes at the end of every week to stay on top of the content!
by Naneeta_Desar_1K
Sun Dec 08, 2019 11:55 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7849
Views: 1089730

Re: Post All Chemistry Jokes Here

What do you call a funny heme complex?

A meme complex :D
by Naneeta_Desar_1K
Fri Dec 06, 2019 5:56 pm
Forum: Naming
Topic: Abbreviations
Replies: 2
Views: 21

Re: Abbreviations

Screen Shot 2019-12-06 at 5.56.44 PM.png


Here's a screenshot from the book.
by Naneeta_Desar_1K
Thu Dec 05, 2019 11:42 pm
Forum: Significant Figures
Topic: Sig Figs on Tests
Replies: 24
Views: 284

Re: Sig Figs on Tests

The problem usually contains an initial number and is usually the standard for how many sig figs need to be in the answer. As a rule of thumb the answer should have the lowest number of sig figs as given in the problem.
by Naneeta_Desar_1K
Thu Dec 05, 2019 11:39 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pKa
Replies: 1
Views: 16

Re: pKa

pKa= -log(Ka)
It is used to address the strength of acids. If the pKa is low then the acid is strong, if the pKa is high it refers to a weak acid.
by Naneeta_Desar_1K
Thu Dec 05, 2019 11:37 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: 6C.17
Replies: 2
Views: 22

Re: 6C.17

Strong bases also dissociate completely similar to strong acids. By identifying which molecule has a greater dissociation ability you can identify which molecule is stronger.
by Naneeta_Desar_1K
Thu Dec 05, 2019 11:35 pm
Forum: DeBroglie Equation
Topic: Quantum Help
Replies: 4
Views: 50

Re: Quantum Help

First identify what the problem addresses in terms of topics because each topic we learned in quantum has particular equations. For example if the question is regarding the photoelectric effect the equations used are very centralized to that topic.
by Naneeta_Desar_1K
Mon Dec 02, 2019 12:06 am
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Strength
Replies: 4
Views: 36

Re: Strength

A strong base is one that is completely dissociated in an aqueous solution.
by Naneeta_Desar_1K
Sun Dec 01, 2019 10:00 am
Forum: Biological Examples
Topic: Vitamin B12
Replies: 3
Views: 24

Re: Vitamin B12

Anemia results from a low vitamin B12 count.
by Naneeta_Desar_1K
Sun Dec 01, 2019 9:47 am
Forum: Student Social/Study Group
Topic: Wednesday 11/27 Lecture
Replies: 5
Views: 67

Re: Wednesday 11/27 Lecture

Yes I can send mine to you!
by Naneeta_Desar_1K
Sat Nov 30, 2019 10:47 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted or Lewis Definition?
Replies: 6
Views: 42

Re: Bronsted or Lewis Definition?

I believe for the final we will have to know both the bronsted and lewis definitions since we went over both in lecture.
by Naneeta_Desar_1K
Sat Nov 30, 2019 10:45 pm
Forum: Naming
Topic: Naming
Replies: 4
Views: 27

Re: Naming

I believe ferrate is the Latin name for iron and we use this name for coordination compounds.
by Naneeta_Desar_1K
Fri Nov 29, 2019 1:50 pm
Forum: Lewis Acids & Bases
Topic: acidic oxide/basic oxide
Replies: 2
Views: 33

Re: acidic oxide/basic oxide

Acidic oxides usually are oxides of nonmetals whereas basic oxides are normally oxides of metals. So, acidic oxides dissolve in water to form acids while basic oxides dissolve in water to form a metal oxide which is basic. In addition, acidic oxides are covalent compounds whereas basic oxides are io...
by Naneeta_Desar_1K
Fri Nov 29, 2019 1:45 pm
Forum: Bronsted Acids & Bases
Topic: 6D11
Replies: 1
Views: 38

Re: 6D11

By breaking down KBr, K+ and Br- is formed. K+ is weak and is attracted to the negatively charged H20 however the attraction is not completely strong enough to adjust the structure of the water molecule. Br- is attracted to the positively charged side of H2O but also isn't strong enough to adjust th...
by Naneeta_Desar_1K
Mon Nov 25, 2019 6:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 1
Views: 29

Test 2

When will be getting back our second test?
by Naneeta_Desar_1K
Mon Nov 25, 2019 6:46 pm
Forum: Naming
Topic: roman numerals
Replies: 7
Views: 42

Re: roman numerals

Many of the transition metals have multiple charged ions therefore the roman numerals clarifies and distinguishes them.
by Naneeta_Desar_1K
Mon Nov 25, 2019 6:40 pm
Forum: Hybridization
Topic: Tetravalence of Carbon
Replies: 3
Views: 18

Re: Tetravalence of Carbon

Carbon is tetravalent because it can form 4 bonds with atoms.
by Naneeta_Desar_1K
Sun Nov 17, 2019 8:26 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Terminal Atom
Replies: 2
Views: 20

Re: Terminal Atom

They are the atoms present at both ends of a molecule.
by Naneeta_Desar_1K
Sun Nov 17, 2019 8:18 pm
Forum: Bond Lengths & Energies
Topic: 3F5 a
Replies: 2
Views: 26

Re: 3F5 a

Since ionic bonds form strong electrostatic interactions with ions they have higher melting points than covalent compounds.
by Naneeta_Desar_1K
Sun Nov 17, 2019 8:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shapes
Replies: 6
Views: 37

Re: Molecular Shapes

Yes, I believe we do since it was covered in lecture.
by Naneeta_Desar_1K
Sun Nov 17, 2019 8:11 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 4
Views: 31

Re: Bond Angles

Yes I don't think we need to know the exact angles but remember if there is a lone pair then the angle might be less than the ones indicated.
by Naneeta_Desar_1K
Sat Nov 16, 2019 5:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Hydrogen Bonding
Replies: 6
Views: 32

Re: Hydrogen Bonding

It's considered a type of dipole-dipole interaction but it is stronger than the normal dipole-dipole interaction.
by Naneeta_Desar_1K
Sat Nov 16, 2019 5:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR and Polarity
Replies: 4
Views: 24

Re: VSEPR and Polarity

You can look at the symmetry of the atoms in order to determine polarity.
by Naneeta_Desar_1K
Sat Nov 16, 2019 5:03 pm
Forum: Dipole Moments
Topic: Interaction Potential Energy
Replies: 2
Views: 31

Re: Interaction Potential Energy

by Naneeta_Desar_1K
Sat Nov 16, 2019 4:57 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Ion Dipole v. Ion Induced Dipole
Replies: 1
Views: 19

Re: Ion Dipole v. Ion Induced Dipole

Ion dipole occurs between an ion that is fully charged and a dipole that is partially charged, whereas ion induced dipole occurs with a fully charged ion and a dipole that is temporarily charged.
by Naneeta_Desar_1K
Sat Nov 16, 2019 4:52 pm
Forum: Dipole Moments
Topic: Shape of Molecule/Strength of Interactions
Replies: 4
Views: 21

Re: Shape of Molecule/Strength of Interactions

Rod shaped molecules have more surface area when they are condensed with one another therefore increasing the area of intermolecular forces having a higher boiling point, spherical molecules have lower boiling points since they don't have an increase in forces.
by Naneeta_Desar_1K
Mon Nov 04, 2019 9:22 am
Forum: Lewis Structures
Topic: Oxygen
Replies: 2
Views: 28

Re: Oxygen

This is because in the case of H2O due to the electron electron repulsion the electrons expand forcing the bonds to be pushed down causing H2O to have a bent shape.
by Naneeta_Desar_1K
Mon Nov 04, 2019 9:17 am
Forum: Electronegativity
Topic: Difference
Replies: 5
Views: 30

Re: Difference

Electronegativity is the ability for an atom to electrons to bond to the element and polarizability is the extent to which an atom is distorted and how dipoles form.
by Naneeta_Desar_1K
Sun Nov 03, 2019 10:07 am
Forum: Electronegativity
Topic: electronegativity trend
Replies: 9
Views: 38

Re: electronegativity trend

Electronegativity decreases down a group due to the increase in shells making the electrons further from the nucleus therefore decreasing the attraction between the protons and electrons.
by Naneeta_Desar_1K
Sun Nov 03, 2019 10:03 am
Forum: Dipole Moments
Topic: Significance
Replies: 2
Views: 20

Re: Significance

They help to predict the molecule's polarity.
by Naneeta_Desar_1K
Sun Nov 03, 2019 10:00 am
Forum: Bond Lengths & Energies
Topic: Ions for the Midterm
Replies: 3
Views: 36

Re: Ions for the Midterm

I believe that for those they might give us the formula since those aren't the ions that we see everyday however I am not completely sure.
by Naneeta_Desar_1K
Sun Oct 27, 2019 10:23 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons
Replies: 3
Views: 26

Re: Valence Electrons

You can figure out the amount by looking at the group the element is categorized under. The group number is usually the amount of valence electrons the element has.
by Naneeta_Desar_1K
Sun Oct 27, 2019 9:36 pm
Forum: Lewis Structures
Topic: Hybridization
Replies: 2
Views: 19

Re: Hybridization

The hybridization is associated withthe atom's steric number. Which is "steric number=# of atoms bonded to the atom + # of lone pairs the atom has"
by Naneeta_Desar_1K
Sun Oct 27, 2019 9:33 pm
Forum: Lewis Structures
Topic: VSEPR: E in AXE
Replies: 2
Views: 13

Re: VSEPR: E in AXE

It represents the free electron pairs.
by Naneeta_Desar_1K
Sun Oct 27, 2019 9:30 pm
Forum: Student Social/Study Group
Topic: Midterm Length
Replies: 7
Views: 91

Re: Midterm Length

Where will be taking the midterm? The same lecture hall as class?
by Naneeta_Desar_1K
Sun Oct 27, 2019 9:27 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity vs. effective nuclear charge
Replies: 5
Views: 19

Re: Electronegativity vs. effective nuclear charge

Electronegativity is the process of atoms to attract electrons in order to build bonds. Effective nuclear charge is the nucleus's pull and strength to hold in the electrons.
by Naneeta_Desar_1K
Sun Oct 20, 2019 5:13 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Advice for studying
Replies: 58
Views: 555

Re: Advice for studying

I do best when I study in a group. I understand information better when other people explain and give their input into various topics!
by Naneeta_Desar_1K
Sun Oct 20, 2019 5:08 pm
Forum: General Science Questions
Topic: Midterm
Replies: 12
Views: 171

Re: Midterm

Will there be a review session for the midterm?
by Naneeta_Desar_1K
Sun Oct 20, 2019 5:03 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg's Constant
Replies: 3
Views: 30

Re: Rydberg's Constant

Yes, just stick to the ones he provides us.
by Naneeta_Desar_1K
Sun Oct 20, 2019 5:00 pm
Forum: Quantum Numbers and The H-Atom
Topic: Matter and wavelike properties
Replies: 3
Views: 26

Re: Matter and wavelike properties

For large objects the wavelength would be far to small to be observable.
by Naneeta_Desar_1K
Sun Oct 20, 2019 1:18 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Wave Function vs Orbital vs Subshell vs Shell
Replies: 3
Views: 27

Re: Wave Function vs Orbital vs Subshell vs Shell

A quick explanation is that the atomic orbital is math function in which explains the wave behavior of either 1 electron or an electron pair in an atom and are composed of electrons in the same energy levels but have different spins. The wave functions are exact physical solutions of Schrodinger equ...
by Naneeta_Desar_1K
Mon Oct 14, 2019 8:56 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: En equation
Replies: 1
Views: 15

Re: En equation

Yes, I believe so, however keep in mind that when applying this number to the context of various problems the value of the photon emitted will not be negative.
by Naneeta_Desar_1K
Mon Oct 14, 2019 8:47 am
Forum: Student Social/Study Group
Topic: Places to study
Replies: 3
Views: 48

Re: Places to study

There are a ton of coffee shops in Westwood that you can study at! Profetta is one of my favorites.
by Naneeta_Desar_1K
Mon Oct 14, 2019 8:46 am
Forum: Properties of Light
Topic: Constants
Replies: 2
Views: 18

Re: Constants

Planck's constant connects the frequency of the electromagnetic radiation to the energy in a quantum or also known as a photon. Rydberg's constant connects the electromagnetic spectra of an atom and is a physical constant.
by Naneeta_Desar_1K
Sun Oct 13, 2019 9:57 pm
Forum: Photoelectric Effect
Topic: electrons
Replies: 2
Views: 40

Re: electrons

hello! I was confused on this too and I found this website that explains it very well! Hope this helps :) https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Quantum_Mechanics/09._The_Hydrogen_Atom/Atomic_...
by Naneeta_Desar_1K
Sun Oct 13, 2019 9:51 pm
Forum: *Shrodinger Equation
Topic: Schrodinger's Equation
Replies: 8
Views: 79

Re: Schrodinger's Equation

Schrodinger’s equation is used for the Uncertainty Principle. It is used to find the energy levels of the QM systems.
by Naneeta_Desar_1K
Sat Oct 05, 2019 12:01 am
Forum: Administrative Questions and Class Announcements
Topic: Frequency of posting
Replies: 2
Views: 29

Frequency of posting

When are the 5 posts on Chemistry Community due each week? I can't remember if it is the Friday or Sunday of each week.
by Naneeta_Desar_1K
Fri Oct 04, 2019 11:56 pm
Forum: Administrative Questions and Class Announcements
Topic: Periodic Table on the Test
Replies: 7
Views: 77

Re: Periodic Table on the Test

Yes, my TA said that the periodic table will be given to us on the test along with the constants. The first test is based off of the fundamental unit we just covered.
by Naneeta_Desar_1K
Fri Oct 04, 2019 11:48 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration order
Replies: 4
Views: 49

Re: Electron configuration order

I think in the book they are referring to the shorthand configuration of that element.
by Naneeta_Desar_1K
Fri Oct 04, 2019 11:45 pm
Forum: Properties of Light
Topic: "n" variable
Replies: 3
Views: 39

Re: "n" variable

The "n" variable usually regards the principle quantum number in regards to the shell and is assigned to electrons in an atom to determine the state of the electron.
by Naneeta_Desar_1K
Fri Oct 04, 2019 11:25 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Reactions
Replies: 25
Views: 292

Re: Balancing Reactions

rachel liu 3k wrote:Must the states of matter always be written in a chemical equation? (s,l,aq)
Yes, the states of matter should always be written in order to visualize the equation in the context of the problem.

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