Search found 93 matches

by Kavya Immadi 3D
Thu Feb 20, 2020 11:46 am
Forum: Balancing Redox Reactions
Topic: oxidation number
Replies: 3
Views: 13

Re: oxidation number

The oxidation number is the number of electrons that an element gains or loses when it makes a bond.
by Kavya Immadi 3D
Thu Feb 20, 2020 11:41 am
Forum: Balancing Redox Reactions
Topic: Reduction vs. oxidation
Replies: 29
Views: 64

Re: Reduction vs. oxidation

LEO the lion goes GER. LEO: lose electrons oxidation GER: gain electrons reduction.

The idea is that when an element's oxidation number (number of electrons) goes down, it's reduced. So gaining electrons will reduce the oxidation number.
by Kavya Immadi 3D
Thu Feb 20, 2020 11:39 am
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Cathode to the Right Rule
Replies: 6
Views: 19

Re: Cathode to the Right Rule

The cathode should always be listed on the right I think it's the standard.
by Kavya Immadi 3D
Thu Feb 20, 2020 11:32 am
Forum: Lewis Acids & Bases
Topic: Midterm Question 3B
Replies: 3
Views: 22

Re: Midterm Question 3B

I just knew from AP Chem that neutralization reactions are exothermic. So for this question, I just determined which reaction had the most moles of reaction in the smallest amount of liquid. The more liquid there is, the more heat that can be absorbed without increasing the temperature much. In othe...
by Kavya Immadi 3D
Tue Feb 18, 2020 11:37 am
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 8
Views: 29

Test 2

What sections of the book are going to be covered in test 2? I know Dr. Lavelle didn't get to all of outline 4. So does the material start with 5G?
by Kavya Immadi 3D
Sun Feb 16, 2020 12:25 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: memorize
Replies: 14
Views: 62

Re: memorize

No, they give us any needed entropy values but you should know how entropy will change in general. ex. entropy increases if a liquid becomes a gas
by Kavya Immadi 3D
Sun Feb 16, 2020 12:22 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Midterm Curve
Replies: 45
Views: 248

Re: Midterm Curve

He doesn't curve individual tests :( but the overall grade is adjusted at the end of the quarter. There's no hope til the end of the quarter :(((
by Kavya Immadi 3D
Sun Feb 16, 2020 12:21 pm
Forum: Balancing Redox Reactions
Topic: oxidation vs reduction
Replies: 18
Views: 45

Re: oxidation vs reduction

LEO the lion goes GER. LEO: lose electrons oxidation GER: gain electrons reduction.

The idea is that when an element's oxidation number (number of electrons) goes down, it's reduced. So gaining electrons will reduce the oxidation number.
by Kavya Immadi 3D
Tue Feb 11, 2020 4:48 pm
Forum: Phase Changes & Related Calculations
Topic: 4B.5
Replies: 7
Views: 42

Re: 4B.5

Matthew ILG 1L wrote:Will the conversion of 1atm=760 Torr be given to us at all? I have yet to find that on the equations sheet from test one. I could be looking in all the wrong places though.


It's on the constants and formula sheet
by Kavya Immadi 3D
Mon Feb 03, 2020 10:44 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Shift Change Rules
Replies: 5
Views: 39

Re: Shift Change Rules

You should know how an equilibrium shifts when concentrations of species are changed, temperature is changed, or when pressure is changed
by Kavya Immadi 3D
Mon Feb 03, 2020 10:44 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: enthalpy
Replies: 7
Views: 19

Re: enthalpy

Enthalpy is equal to the heat of a system if there is no expansion work.
by Kavya Immadi 3D
Mon Feb 03, 2020 10:43 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: enthalpy
Replies: 7
Views: 28

Re: enthalpy

Enthalpy is the amount of heat absorbed or released by a reaction if there is no expansion work
by Kavya Immadi 3D
Mon Feb 03, 2020 10:41 am
Forum: Calculating Work of Expansion
Topic: Calculus on The Midterm
Replies: 8
Views: 28

Calculus on The Midterm

Will the midterm have problems where we use derivatives and integrals? In what problems would these be used.
by Kavya Immadi 3D
Mon Feb 03, 2020 10:38 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: First Law
Replies: 5
Views: 22

Re: First Law

Internal energy is the sum of potential and kinetic energy.
by Kavya Immadi 3D
Tue Jan 28, 2020 6:02 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: How to do 4A.13
Replies: 1
Views: 21

How to do 4A.13

A constant-volume calorimeter was calibrated by carrying out a reaction known to release 3.50 kJ of heat in 0.200 L of solution in the calorimeter (q 5 23.50 kJ), resulting in a temperature rise of 7.32 8C. In a subsequent experiment, 100.0 mL of 0.200 m HBr(aq) and 100.0 mL of 0.200 m KOH(aq) were ...
by Kavya Immadi 3D
Mon Jan 27, 2020 10:18 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: "Breaking bonds is always endothermic"
Replies: 6
Views: 26

Re: "Breaking bonds is always endothermic"

When the phosphate bond of ATP is broken, a small input of energy is required. However, the formation of new bonds (between OH and the last P in ADP) releases lots of energy so the net energy change is an increase in energy.
by Kavya Immadi 3D
Mon Jan 27, 2020 10:14 am
Forum: Phase Changes & Related Calculations
Topic: Steam vs water
Replies: 5
Views: 28

Re: Steam vs water

Steam, despite being at the same temperature as water, has more energy because during a phase change, a substance can absorb energy without increasing in temperature. This excess energy is transferred to your skin and causes burns
by Kavya Immadi 3D
Mon Jan 27, 2020 10:12 am
Forum: Phase Changes & Related Calculations
Topic: Heat capacities
Replies: 6
Views: 26

Re: Heat capacities

Heat capacities will generally be given on tests.
by Kavya Immadi 3D
Mon Jan 27, 2020 10:11 am
Forum: Phase Changes & Related Calculations
Topic: Heat capacities
Replies: 6
Views: 26

Re: Heat capacities

Heat capacities will generally be given on tests.
by Kavya Immadi 3D
Mon Jan 27, 2020 10:10 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: autoprotolysis
Replies: 7
Views: 34

Re: autoprotolysis

Autoprotolysis is when H+ ions are transferred from 2 molecules of the same species. When you write out the chemical equation for this transfer, you can write a K equation for it.
by Kavya Immadi 3D
Mon Jan 27, 2020 10:10 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: autoprotolysis
Replies: 7
Views: 34

Re: autoprotolysis

Autoprotolysis is when H+ ions are transferred from 2 molecules of the same species. When you write out the chemical equation for this transfer, you can write a K equation for it.
by Kavya Immadi 3D
Mon Jan 27, 2020 10:08 am
Forum: General Science Questions
Topic: Fall 2019 final
Replies: 7
Views: 44

Re: Fall 2019 final

Lavelle said week 3 but I've heard that they will be available for most of this quarter
by Kavya Immadi 3D
Sun Jan 26, 2020 4:52 pm
Forum: Phase Changes & Related Calculations
Topic: phase changes
Replies: 6
Views: 23

Re: phase changes

not all phase changes are exothermic, some are endothermic
by Kavya Immadi 3D
Sun Jan 26, 2020 4:51 pm
Forum: Phase Changes & Related Calculations
Topic: Phase changes: endothermic vs exothermic
Replies: 12
Views: 55

Re: Phase changes: endothermic vs exothermic

yes, the reverse of endothermic reactions are exothermic and vice versa
by Kavya Immadi 3D
Sun Jan 26, 2020 4:45 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity
Replies: 7
Views: 27

Re: Heat Capacity

High heat capacity means that more energy is taken to increase or decrease the overall temperature.
by Kavya Immadi 3D
Sun Jan 26, 2020 4:44 pm
Forum: Phase Changes & Related Calculations
Topic: State property
Replies: 6
Views: 23

Re: State property

A state property doesn't depend on the path taken to get to that state but just the state itself.
by Kavya Immadi 3D
Sun Jan 26, 2020 4:44 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Lewis Structures Method 2
Replies: 6
Views: 25

Re: Lewis Structures Method 2

Although it's not absolutely necessary, it can be helpful.
by Kavya Immadi 3D
Sat Jan 18, 2020 10:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constant Units
Replies: 4
Views: 20

Re: Equilibrium Constant Units

The reason why is because when you say you're using concentrations of partial pressures, you're actually using activities of each species. I think when you calculate the activity of each species, the units cancel out.
by Kavya Immadi 3D
Sat Jan 18, 2020 10:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Decreasing pressure
Replies: 4
Views: 24

Re: Decreasing pressure

If pressure is increased, volume decreases. If volume decreases the reaction proceeds to the side with less moles of gas.

If pressure is decreased, volume increases. If volume increases the reaction proceeds to the side with more moles of gas.
by Kavya Immadi 3D
Fri Jan 17, 2020 3:45 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5 percent rule
Replies: 10
Views: 44

Re: 5 percent rule

The 5% rule is just a way of making sure that when you remove the x from the bottom of the fraction, you aren't affecting the answer. The idea is if x is less than 5% of the number its being subtracted from, it makes such a little difference that it is mathematically ok to assume x is 0 relative to ...
by Kavya Immadi 3D
Fri Jan 17, 2020 3:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc & Kp
Replies: 12
Views: 37

Re: Kc & Kp

gabbymaraziti wrote:Can we just use K and not specify Kc or Kp? Or would we be marked down?


I feel like they won't care on the test. But it can't hurt to take a look at the units and add the C or P.
by Kavya Immadi 3D
Fri Jan 17, 2020 3:35 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature Change
Replies: 9
Views: 48

Re: Temperature Change

If the products require energy to be formed and the temperature increases, the forward reaction will be favored because the system will want to decrease the temperature. To do so, the reactants will react and absorb excess heat (because the forward reaction is endothermic). On the other hand, if the...
by Kavya Immadi 3D
Wed Jan 08, 2020 11:18 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q vs K
Replies: 13
Views: 86

Re: Q vs K

Although Q and K are calculated the same way, the difference is the state of the reaction at the time when this is calculated: Q can be any specific point of time while K must be when the reaction is at equilibrium.
by Kavya Immadi 3D
Wed Jan 08, 2020 11:12 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Pressure changes to equilibrium equations
Replies: 5
Views: 42

Re: Pressure changes to equilibrium equations

When a mixture is compressed, there is less volume for gasses to exist so the system will shift towards the side with fewer moles of gas. In other words, gasses take up less space so when there is less space, the reaction will go more towards whatever side has fewer moles of gas.
by Kavya Immadi 3D
Wed Jan 08, 2020 11:10 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: How to make ICE box
Replies: 15
Views: 89

Re: How to make ICE box

Allow the change to be x (ie. on the reactants side, the change would be -2x if the stoichiometric coefficient is 2). Add the change to the initial value to get the equilibrium expression. Plug in the expressions into a K equation and if the value of K is given, algebra can be used to solve for x ak...
by Kavya Immadi 3D
Wed Jan 08, 2020 11:02 am
Forum: Ideal Gases
Topic: Equilibrium
Replies: 7
Views: 31

Re: Equilibrium

Although Q and K are calculated the same way, the difference is the state of the reaction at the time when this is calculated: Q can be any specific point of time while K must be when the reaction is at equilibrium.
by Kavya Immadi 3D
Sun Dec 08, 2019 5:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs linear
Replies: 56
Views: 300

Re: Bent vs linear

If there are lone pairs, the molecule is probably bent
by Kavya Immadi 3D
Sun Dec 08, 2019 5:56 pm
Forum: Quantum Numbers and The H-Atom
Topic: n, l ,ml, ms
Replies: 13
Views: 125

Re: n, l ,ml, ms

Spin up is +1/2
Spin down is -1/2
by Kavya Immadi 3D
Sun Dec 08, 2019 5:56 pm
Forum: Hybridization
Topic: lone pairs in hybridization
Replies: 6
Views: 45

Re: lone pairs in hybridization

You use the number of electron densities (lone pairs and bonding pairs) to determine the number of orbitals required.
by Kavya Immadi 3D
Sun Dec 08, 2019 5:54 pm
Forum: Air Pollution & Acid Rain
Topic: Respiratory Acidosis
Replies: 3
Views: 25

Re: Respiratory Acidosis

Just a note on this topic: blood usually has a ph of 7.35-7.45 so technically even 7 is acidic
by Kavya Immadi 3D
Sat Dec 07, 2019 11:51 pm
Forum: Air Pollution & Acid Rain
Topic: Carbon Dioxide and respiratory acidosis
Replies: 5
Views: 447

Re: Carbon Dioxide and respiratory acidosis

Chantel_4B wrote:Does the CO2 make the body more acidic when it interacts with water? Or is it when it interacts with something else? Or by itself?

CO2 reacts with water to form carbonic acid (H2CO3) which is a weak acid that increases the acidity of blood
by Kavya Immadi 3D
Fri Nov 29, 2019 12:13 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Inorganic vs organic
Replies: 5
Views: 27

Re: Inorganic vs organic

If it contains carbon it is organic ! Actually there are a few molecules that have carbon but are inorganic: CO2, CO, carbonates, carbides, cyanides, cyanates, and thiocyanates. But most bigger molecules that contain carbon are organic so its a good rule of thumb but just keep in mind that that isn...
by Kavya Immadi 3D
Thu Nov 28, 2019 11:56 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid Strength
Replies: 6
Views: 41

Re: Acid Strength

These are the strong acids:
HCl, HBr, HI,
HNO3, H2SO4, HClO4, HClO3

These are the strong bases:
LiOH, NaOH, KOH, RbOH, CsOH
Ca(OH)2, Sr(OH)2, Ba(OH)2
by Kavya Immadi 3D
Thu Nov 28, 2019 11:48 pm
Forum: Lewis Acids & Bases
Topic: Lewis v Bronsted acids/bases
Replies: 2
Views: 23

Re: Lewis v Bronsted acids/bases

A Lewis acid and base accept and donate electrons respectively. Make sure you know the difference between that and Bronsted-Lowry acid and base which donate and accept protons respectively.
by Kavya Immadi 3D
Thu Nov 28, 2019 11:47 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Bronsted Acid/Base
Replies: 4
Views: 21

Re: Bronsted Acid/Base

A Lewis acid and base accept and donate electrons respectively. Make sure you know the difference between that and Bronsted-Lowry acid and base which donate and accept protons respectively.
by Kavya Immadi 3D
Thu Nov 28, 2019 11:46 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Lewis Acid/Base
Replies: 5
Views: 33

Re: Lewis Acid/Base

A Lewis acid and base accept and donate electrons respectively. Make sure you know the difference between that and Bronsted-Lowry acid and base which donate and accept protons respectively.
by Kavya Immadi 3D
Thu Nov 21, 2019 3:29 pm
Forum: Hybridization
Topic: 2F.1
Replies: 3
Views: 36

Re: 2F.1

I think its asking where the orbitals are pointing. For example, sp2 orbitals are pointing towards the corners of an equilateral triangle and form bond angles of 120.
by Kavya Immadi 3D
Thu Nov 21, 2019 3:23 pm
Forum: Sigma & Pi Bonds
Topic: Pi bonding
Replies: 3
Views: 37

Re: Pi bonding

Because in biology, the form of a molecule is vital for its function. The fact that pi bonds don't allow for rotation locks the molecule into a certain shape at double and triple bonds which allow molecules to do its function. Also, the fact that pi bonds don't allow for rotation leads to cis and tr...
by Kavya Immadi 3D
Wed Nov 20, 2019 2:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles in Square Pyramidal and T-Shaped
Replies: 4
Views: 45

Re: Bond Angles in Square Pyramidal and T-Shaped

The bond angles in a square pyramidal are slightly less than 90 degrees because of the extra repulsion of the lone pair. The electron geometry is a octahedral so all the bond angles are the same (the term equatorial atom is used for trigonal bipyramidal). For T-shape, the bond angles will always be ...
by Kavya Immadi 3D
Tue Nov 19, 2019 8:57 pm
Forum: General Science Questions
Topic: Test 2 Review
Replies: 8
Views: 96

Re: Test 2 Review

What do we need to know for "lone pairs and the reason for their locations"? I'm not sure what this is referring to I think its talking about molecules with the formula AX4E because the electron geometry is trigonal bipyramidal and the lone pair can be on either the axial or the equatoria...
by Kavya Immadi 3D
Tue Nov 19, 2019 8:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 3
Views: 37

Re: Bond Angles

Also for the specific formulas you're asking about, there's only 2 atoms so they can only form 180 degree angles. Just cuz any two points can make a straight line.
by Kavya Immadi 3D
Tue Nov 19, 2019 8:22 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: Dipole-Dipole
Replies: 5
Views: 50

Re: Dipole-Dipole

If the two dipole moments cancel out (ex. CO2), the molecule is considered non-polar and doesn't have dipole-dipole interactions.
by Kavya Immadi 3D
Thu Nov 14, 2019 7:18 pm
Forum: Naming
Topic: Naming Compounds (general question)
Replies: 5
Views: 36

Re: Naming Compounds (general question)

I doubt it since we didn't really go over it in class/discussion
by Kavya Immadi 3D
Thu Nov 14, 2019 7:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Homework 2E.1
Replies: 4
Views: 25

Re: Homework 2E.1

You figure that out by drawing the Lewis structure. You should follow all the rules that we learned the past few weeks (most atoms must have complete octets, you want the lowest possible formal charge, etc)
by Kavya Immadi 3D
Thu Nov 14, 2019 7:13 pm
Forum: Trends in The Periodic Table
Topic: Question
Replies: 17
Views: 158

Re: Question

Ionization energy is the energy needed to remove electrons from atoms. Electronegativity is how much an atom attracts electrons.
by Kavya Immadi 3D
Thu Nov 14, 2019 7:07 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: Atom size vs. boiling point
Replies: 4
Views: 36

Re: Atom size vs. boiling point

A bigger atomic radii increases the polarizability of the molecule which increases the amount of induced dipole- induced dipole forces in a body of that molecule. More intermolecular forces will lead to a higher boiling point. In short, bigger atomic size leads to a higher boiling point.
by Kavya Immadi 3D
Thu Nov 14, 2019 7:05 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Quick Question
Replies: 4
Views: 41

Re: Quick Question

For a 4p electron, n=4 and l=1. A 4d electron would be l=2.
by Kavya Immadi 3D
Thu Nov 14, 2019 6:57 pm
Forum: Lewis Structures
Topic: Balanced Lewis Structures
Replies: 6
Views: 36

Re: Balanced Lewis Structures

It doesn't really matter how you draw lewis structures (in the sense that it doesn't matter if a certain atom is attached horizontally or vertically to the central atom). Lewis structures are mainly just meant to show which atoms are bonded to which, the number of bonds between two atoms, the number...
by Kavya Immadi 3D
Wed Nov 13, 2019 11:28 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: 3F.1 Part a
Replies: 4
Views: 40

Re: 3F.1 Part a

The first step is to draw the lewis structure https://img1.daumcdn.net/thumb/R800x0/?scode=mtistory2&fname=https%3A%2F%2Ft1.daumcdn.net%2Fcfile%2Ftistory%2F2506B63D57609A5621 Because there are H, O and N, this molecule forms hydrogen bonds. Also, every molecule has london forces.
by Kavya Immadi 3D
Wed Nov 13, 2019 2:47 pm
Forum: Bronsted Acids & Bases
Topic: Autoprotolysis
Replies: 1
Views: 34

Re: Autoprotolysis

Autoprotolysis is when a proton (H+) is transferred from 1 molecule to another molecule that is identical to the first. For example: 2 H2O --> H3O + +OH - in that reaction, a proton is transferred from 1 water to another, making 1 a bronsted base and the other a bronsted acid. The autoprotolysis con...
by Kavya Immadi 3D
Wed Nov 06, 2019 12:26 pm
Forum: General Science Questions
Topic: Midterm
Replies: 2
Views: 53

Midterm

Will the midterm test on people/experiments? (like Thomson or Millikan)
by Kavya Immadi 3D
Tue Nov 05, 2019 7:39 pm
Forum: General Science Questions
Topic: Line Structures on the Midterm?
Replies: 1
Views: 29

Re: Line Structures on the Midterm?

I really doubt you need to know line structures tbh.
by Kavya Immadi 3D
Tue Nov 05, 2019 9:51 am
Forum: Lewis Structures
Topic: 2c.17
Replies: 1
Views: 17

Re: 2c.17

Stated another way, the question is just asking which structure is more stable and thus more common. So you should check the structure to make sure that all the elements with expanded/incomplete octets are correct, that formal charges are as low as possible, that the number of valence electrons is c...
by Kavya Immadi 3D
Tue Nov 05, 2019 9:39 am
Forum: Bond Lengths & Energies
Topic: Finding the Length of the Bond/Is this on the midterm? [ENDORSED]
Replies: 1
Views: 78

Re: Finding the Length of the Bond/Is this on the midterm? [ENDORSED]

The figure shows a periodic table with the common bond lengths of some elements. So for CF4, each bond is a single bond between C and F (draw the lewis structure to know that). You just go to the table, find the values for a single bond C and for F, and add the numbers together. The length of a sing...
by Kavya Immadi 3D
Tue Nov 05, 2019 9:31 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Uncertainty in Position
Replies: 4
Views: 58

Re: Heisenberg Uncertainty in Position

Yes because the total possible uncertainty in position is +5 AND -5. So if the position is 10m +/-5m. The position can be anywhere from 5m to 15 m so the uncertainty is 10 m. But you do have to be careful because if the position of a thrown ball is 3m to the left +/- 5m, the uncertainty is not 10 m ...
by Kavya Immadi 3D
Tue Nov 05, 2019 7:56 am
Forum: Ionic & Covalent Bonds
Topic: 2D.3
Replies: 3
Views: 36

Re: 2D.3

If you find the difference in electronegativity between Be and Br, it's 1.39. Generally, if the difference is less than about 1.5, it will show covalent character.
by Kavya Immadi 3D
Wed Oct 30, 2019 3:11 am
Forum: Octet Exceptions
Topic: List of Octet exceptions
Replies: 6
Views: 52

Re: List of Octet exceptions

I know for sure that H, Li, Be, and B generally form a duplet instead of an octet. Also, once the elements pass the 3p block, it can have an expanded valence electron shell and form more than an octet.
by Kavya Immadi 3D
Wed Oct 30, 2019 3:08 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Hw problem 2A.15
Replies: 1
Views: 28

Re: Hw problem 2A.15

Elements are generally likely to try and form an octet with the valence electrons (exceptions include H, Li, Be, and B who want to create a duplet). So S needs 2 electrons to form a full valence shell so the most likely ion is S 2- . Te is also 2 electrons so it will form Te 2- . Rb is 1 electron aw...
by Kavya Immadi 3D
Wed Oct 30, 2019 2:54 am
Forum: Ionic & Covalent Bonds
Topic: Homework for Week 5
Replies: 8
Views: 57

Re: Homework for Week 5

I genuinely don't think the TA cares what questions you do as long as they are somewhat current. I say do it on whatever you want to review.
by Kavya Immadi 3D
Wed Oct 30, 2019 2:53 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: d block before s block
Replies: 3
Views: 24

Re: d block before s block

Some people write the d-block before the s-block because when an element is losing electrons, it'll lose them from the s-block first. However, my TA said that it's more common for people to write the s-block before the d-block because when electrons are being placed into an element, electrons are ad...
by Kavya Immadi 3D
Wed Oct 30, 2019 2:50 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Question 1E 1
Replies: 3
Views: 33

Re: Question 1E 1

The answer at the back of the book says that it wouldn't matter if the element is H or Li.
by Kavya Immadi 3D
Wed Oct 23, 2019 1:03 am
Forum: Photoelectric Effect
Topic: Work Function?
Replies: 7
Views: 58

Re: Work Function?

The work function is used to calculate the energy required to remove an electron from a metal.
by Kavya Immadi 3D
Wed Oct 23, 2019 12:55 am
Forum: Photoelectric Effect
Topic: post module assignment Q 19
Replies: 4
Views: 34

Re: post module assignment Q 19

Yes, the answer is D. The first three are all variations of the energy change between a photon and the electron/metal.
by Kavya Immadi 3D
Wed Oct 23, 2019 12:51 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: predicting the type of orbital
Replies: 2
Views: 27

Re: predicting the type of orbital

You remove an electron from the highest energy level (furthest from the nucleus). You can figure out the relative energy levels of orbitals using a periodic table and moving across each row from left to right.
by Kavya Immadi 3D
Wed Oct 23, 2019 12:44 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: s, p, d, f orbitals
Replies: 15
Views: 90

Re: s, p, d, f orbitals

This picture shows the energy levels of all the orbitals:
Image
by Kavya Immadi 3D
Wed Oct 23, 2019 12:43 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations
Replies: 13
Views: 132

Re: Electron Configurations

The easiest way is to use the periodic table but you can also use this chat:
Image
by Kavya Immadi 3D
Sat Oct 19, 2019 4:22 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Lobes
Replies: 2
Views: 25

Re: Lobes

A lobe is a section of an orbital bordered by one or more orbital nodes.
by Kavya Immadi 3D
Sat Oct 19, 2019 4:14 pm
Forum: Properties of Electrons
Topic: Balmar and Lyman series
Replies: 2
Views: 24

Re: Balmar and Lyman series

N(1) is the final energy level and N(2) is the initial energy level.
by Kavya Immadi 3D
Sat Oct 19, 2019 2:54 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Writing Electron Configurations
Replies: 7
Views: 55

Re: Writing Electron Configurations

I think in general you don't include the x, y, z. I know for sure that you don't use it for d orbitals.
by Kavya Immadi 3D
Sat Oct 19, 2019 2:50 pm
Forum: General Science Questions
Topic: Midterm
Replies: 12
Views: 171

Midterm

When and what time is the midterm? (Chem 14a)
by Kavya Immadi 3D
Sat Oct 19, 2019 2:37 pm
Forum: Photoelectric Effect
Topic: One photon one atom interaction
Replies: 14
Views: 87

Re: One photon one atom interaction

After the energy of the photon surpasses the minimum energy, increasing the frequency of the photon would not increase the number of electrons ejected because each photon interacts with 1 electron, not multiple. A higher frequency correlates to a higher kinetic energy of the ejected electron. Increa...
by Kavya Immadi 3D
Sun Oct 13, 2019 11:15 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 56
Views: 390

Re: Best Way To Study?

I study best by doing all the problems in the syllabus (or at least run through them so I know how to do them). I also suggest going through the book or watching the modules and taking the most important notes (like a 1 page cram sheet).
by Kavya Immadi 3D
Sun Oct 13, 2019 11:00 pm
Forum: DeBroglie Equation
Topic: Using the De Broglie equation
Replies: 1
Views: 23

Re: Using the De Broglie equation

If the particle has a de Broglie wavelength of less than 10-15, it doesn't have detectable wavelike properties.
by Kavya Immadi 3D
Sun Oct 13, 2019 10:57 pm
Forum: *Shrodinger Equation
Topic: Schrodinger's Equation
Replies: 8
Views: 79

Re: Schrodinger's Equation

Schrodinger's equation: a very complicated equation that describes the wave function of an atom and thus created quantum mechanics. De Broglie's wave equation: tells you the wavelength given off by any moving particle with momentum (mass and velocity). Heisenberg's indeterminacy equation: says that ...
by Kavya Immadi 3D
Thu Oct 10, 2019 4:36 pm
Forum: Properties of Electrons
Topic: Understanding Balmer & Lyman Series
Replies: 3
Views: 42

Re: Understanding Balmer & Lyman Series

As the others said, the Lyman series is for electrons that end at n=1 and the Balmer series is for electrons that end at n=2. But the main reason why these two regions are highlighted is just because they involve the 2 biggest "jumps" or energy differences. There are other series for other...
by Kavya Immadi 3D
Thu Oct 10, 2019 4:21 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Help on A1.15
Replies: 4
Views: 72

Re: Help on A1.15

Image


c is 2.998 * 108 m/s
Convert the wavelength to meters (nm-->m)
R is 3.29 * 1015 s-1
by Kavya Immadi 3D
Thu Oct 03, 2019 8:44 pm
Forum: Molarity, Solutions, Dilutions
Topic: Self test G2B
Replies: 1
Views: 47

Re: Self test G2B

Multiply 50.00 mL by 10-3 to convert to liters. Then multiply by the molarity of 0.125 mol/L. Finally multiply by the molar mass (90.03 g/mol) to get the mass of oxalic acid required. The answer is .5627 grams.
by Kavya Immadi 3D
Thu Oct 03, 2019 8:15 pm
Forum: Balancing Chemical Reactions
Topic: Net Ionic Units
Replies: 2
Views: 38

Re: Net Ionic Units

Polyatomic ions dissolve in connected units. So Na3PO4 would dissolve into 4 units (3 sodium and 1 PO4 3-).
by Kavya Immadi 3D
Thu Oct 03, 2019 8:10 pm
Forum: Molarity, Solutions, Dilutions
Topic: F 13
Replies: 2
Views: 39

Re: F 13

Molecular compounds are just named based on the atom name (the second name ends in -ide) and the number of atoms. So it'd be phosphorus pentachloride
by Kavya Immadi 3D
Thu Oct 03, 2019 4:50 pm
Forum: Empirical & Molecular Formulas
Topic: F.3 Chemical Principle 7th edition
Replies: 2
Views: 49

Re: F.3 Chemical Principle 7th edition

a) HNO3
b) Oxygen. Hydrogen is approx 1 amu, nitrogen is approx 14 amu, and oxygen is approx 16 amu. Since there are 3 oxygen, it will have a higher mass percent.
by Kavya Immadi 3D
Thu Oct 03, 2019 4:45 pm
Forum: Significant Figures
Topic: subtracting with sig figs
Replies: 5
Views: 92

Re: subtracting with sig figs

You're supposed to round to the smallest number of digits after the decimal point. Because 2.026 has 3 digits after the decimal and 1.0579 has 4 digits after the decimal, the answer should have 3 digits after the decimal. The answer is 0.968

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