Search found 111 matches

by JustinHorriat_4f
Sun Mar 15, 2020 8:33 pm
Forum: First Order Reactions
Topic: Pseudo first order
Replies: 2
Views: 36

Pseudo first order

When it talks about pseudo first order, second order, etc in the notes and concentrations are changing, how would we solve that? Can someone give me an example? Also can someone explain the reasoning behind the method?
by JustinHorriat_4f
Sun Mar 15, 2020 8:32 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Different methods
Replies: 2
Views: 54

Different methods

If someone wanted to sum it up,When do use rate law, integrated rate law, and pre equilibrium approaches when dealing with kinetics?
by JustinHorriat_4f
Sun Mar 15, 2020 8:29 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Seeing how many electrons transfer
Replies: 2
Views: 51

Seeing how many electrons transfer

For seeing how many electrons are transferring can u do two ways, separate and find oxidation numbers for a specific atom or just balance each of the equations?
Do both ways work?
by JustinHorriat_4f
Sun Mar 15, 2020 8:28 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Exothermic reactions
Replies: 3
Views: 53

Exothermic reactions

Does decrease temperature increase the rate for an exothermic reaction?
by JustinHorriat_4f
Sun Mar 15, 2020 8:26 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: Ea, rate, and temperature
Replies: 4
Views: 50

Ea, rate, and temperature

How are change of rate, Activation energy, and temperature all related?
Does this matter for endothermic vs exothermic?
This question is regarding the final question on the final?
by JustinHorriat_4f
Sun Mar 08, 2020 11:35 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: K’
Replies: 4
Views: 19

K’

I keep seeing k’ what is that? Is it just a different k? Like k1 and k2?
by JustinHorriat_4f
Sun Mar 08, 2020 11:33 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Midterm
Replies: 2
Views: 65

Midterm

On one of the questions for the midterm it asked which combination of acid and base would have the biggest change of temperature. I had no clue how to approach this, can someone explain this to me.
by JustinHorriat_4f
Sun Mar 08, 2020 11:26 pm
Forum: Interesting Applications: Rechargeable Batteries (Cell Phones, Notebooks, Cars), Fuel Cells (Space Shuttle), Photovoltaic Cells (Solar Panels), Electrolysis, Rust
Topic: pH
Replies: 3
Views: 50

pH

Can someone explain to me how a pH electrode is used and how it has to do with what we are learning?
by JustinHorriat_4f
Sun Mar 08, 2020 11:24 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Finding k1 when given two temperatues
Replies: 6
Views: 85

Finding k1 when given two temperatues

When given two temperatures and asked to find one of the K’s, how do we know which temperature is T1 and K1?
Does it matter?
by JustinHorriat_4f
Sun Mar 08, 2020 11:22 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Applying La Chateliers
Replies: 4
Views: 41

Applying La Chateliers

In the lecture, Professor Lavelle talked about how You can apply LA chateliers principle to E cell. I didn’t understand it. What happens when you increase one of the reactants? What happens to
The E of cell?
by JustinHorriat_4f
Sun Mar 01, 2020 11:46 pm
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: n in Equation
Replies: 6
Views: 52

Re: n in Equation

n is the number of electrons so you would divide the rxn into half rxns and see how many electrons are being transferred and thats your n. In this case it is 2.
by JustinHorriat_4f
Sun Mar 01, 2020 11:44 pm
Forum: General Rate Laws
Topic: class notes
Replies: 2
Views: 33

class notes

when Dr. Lavelle said in class that the "slow" stop determine the rate if rxn what did he mean? What is the slow step?
by JustinHorriat_4f
Sun Mar 01, 2020 11:41 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Standard E of concentration cell
Replies: 1
Views: 25

Standard E of concentration cell

Why is the standard E of a concentration cell always 0? like can someone explain that using the diagram?
by JustinHorriat_4f
Sun Mar 01, 2020 11:40 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: concentration cell
Replies: 3
Views: 35

concentration cell

Does a concentration cell have to have the same things in both its anode and cathode? and does that mean a concentration cell is basically a galvanic cell but with difference concentrations on each sides?
by JustinHorriat_4f
Sun Mar 01, 2020 11:38 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: at equilibrium
Replies: 1
Views: 36

at equilibrium

so basically would we use the Nernst Equation to find the initial Potential when there is a change in concentration however after the run reach equilibrium we know that E cell=0 because change in G=0? Also then would we use the equation to find the K?
by JustinHorriat_4f
Sun Feb 23, 2020 11:50 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst Equation usage
Replies: 6
Views: 42

Nernst Equation usage

I am still confused on when we would need to use the Nernst Equation? Like what kind of questions would be asked that would prompt us to use the equation?
by JustinHorriat_4f
Sun Feb 23, 2020 11:47 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Work and Battery system
Replies: 6
Views: 48

Work and Battery system

I still don't understand how A battery system has to do with work? Why is the amount of energy that leaves the system -w? And When does energy leave a battery system?
by JustinHorriat_4f
Sun Feb 23, 2020 11:45 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell potential
Replies: 3
Views: 28

cell potential

If the Standard cell potential is an intensive property, then why does concentration affect cell potential using La chatters principle.
by JustinHorriat_4f
Sun Feb 23, 2020 11:42 pm
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: conducting solids
Replies: 5
Views: 39

conducting solids

What are example so conducting solids and not conduction solids? Whats their significant?
by JustinHorriat_4f
Sun Feb 23, 2020 11:39 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: w max
Replies: 3
Views: 50

w max

Can someone explain to me what w(max) is and why they will equal change of G at constant T and P
by JustinHorriat_4f
Sun Feb 23, 2020 11:16 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: salt bridge
Replies: 5
Views: 49

salt bridge

what exactly does the salt bridge do and How does it help neutralize the charge buildup? Also what even causes the charge buildup originally? Can you explain with an example?
by JustinHorriat_4f
Sun Feb 16, 2020 11:56 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: ΔS
Replies: 1
Views: 68

Re: ΔS

We would use the the equation qsystem=-q surrounds if we know it’s a reversible process, and use the q of surrounds to find S of surroundings. If it’s irreversible isothermal and no work is and we find that no heat is given of my the system then we know the delta S of surroundings is 0.
by JustinHorriat_4f
Sun Feb 16, 2020 11:52 pm
Forum: Ideal Gases
Topic: When to use equation
Replies: 9
Views: 134

When to use equation

Ik that you would use this equation to find a value such as moles when given temp pressure and volume. However, can you use this equation to get the moles of reactant then go to moles of product and then find the concentration of the product using the volume?
by JustinHorriat_4f
Sun Feb 16, 2020 11:49 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Second law of thermodynamics
Replies: 6
Views: 101

Second law of thermodynamics

Can someone explain to me the second law of thermodynamics? I know what it says but I’m struggling to understand the concept behind it.
by JustinHorriat_4f
Sun Feb 16, 2020 11:41 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Hc vs Hf
Replies: 3
Views: 85

Hc vs Hf

Is there a difference between Hc and Hf?
Would you use them exactly them say as in products minus reactants?
by JustinHorriat_4f
Sun Feb 16, 2020 11:40 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Limiting reactant and heat
Replies: 4
Views: 99

Limiting reactant and heat

I saw a lot of questions with using limiting react and then finding heat with it, and I don’t understand how a limiting reactant has anything to do with heat? Can someone explain?!
by JustinHorriat_4f
Sun Feb 16, 2020 11:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ph
Replies: 8
Views: 89

Ph

When given the pH, is it always the ph at equilibrium so therefore we can find the h+ at equillibrium?
If not how would it be worded when it refers to initial h+ concentration
by JustinHorriat_4f
Mon Feb 10, 2020 12:57 am
Forum: Phase Changes & Related Calculations
Topic: delta T
Replies: 1
Views: 24

delta T

for delta T is it always Tf-Ti because lets say a copper at 100 degrees celsius were to drop in temperature, is the delta T Tf-100 or 100 -Ti
by JustinHorriat_4f
Mon Feb 10, 2020 12:19 am
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: standard entropy meaning
Replies: 3
Views: 17

standard entropy meaning

What is the meaning behind standard entropy? Is it just entropy at a specific temperature?
by JustinHorriat_4f
Mon Feb 10, 2020 12:16 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Entropy of universe
Replies: 3
Views: 28

Entropy of universe

Does anyone have an explanation on why it is a spontaneous process if the change in entropy of the universe is +? Why is this favorable.
by JustinHorriat_4f
Mon Feb 10, 2020 12:11 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: identifying systems
Replies: 3
Views: 33

identifying systems

I still have difficulties identifying what systems are, will we need to identify systems such as open closed or isolated for the midterm? If so, does anyone have a trick that would be able to help me?
by JustinHorriat_4f
Mon Feb 10, 2020 12:05 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: ideal gas equation.
Replies: 2
Views: 40

ideal gas equation.

Can someone explain the equation Utotal= 3/2 nRT. I don't understand where this equation cam from. Also Why does then Delta U equal 0 because delta T is 0. Why is delta T=0.
by JustinHorriat_4f
Mon Feb 10, 2020 12:02 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 4C.3
Replies: 1
Views: 31

4C.3

Hi, 4C.3 says "Calculate the final temperature and the change in enthalpy when 765 J of energy is transferred as heat to 0.820 mol Kr(g) at 298 K and 1.00 atm (a) at constant pressure; (b) at constant vol- ume. Treat the gas as ideal." I get how you have q and you have separate equations f...
by JustinHorriat_4f
Sun Feb 09, 2020 11:59 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: irreversible vs reversible
Replies: 3
Views: 29

irreversible vs reversible

hi i still don't get the difference between a irreversible and reversible reaction, What are examples of each??
by JustinHorriat_4f
Sun Feb 09, 2020 11:59 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: constant pressure system
Replies: 2
Views: 19

constant pressure system

I still don't get a constant pressure system. Like what is an example of it?
by JustinHorriat_4f
Sun Feb 09, 2020 11:58 pm
Forum: Calculating Work of Expansion
Topic: work done at equilibrium
Replies: 1
Views: 30

work done at equilibrium

what is the importance of the equation of the work done at equilibrium? (the integral). Because it still gets you the same equation?
by JustinHorriat_4f
Sun Feb 02, 2020 11:47 pm
Forum: Calculating Work of Expansion
Topic: Area under the curve
Replies: 3
Views: 36

Area under the curve

Right before lecture ended, Dr. Lavelle was talking about areas under a curve to measure work and other stuff. What do we have to know about area under a curve because I know that with integrals you are able to measure the area under a curve, but why is that important and do we even have to know that?
by JustinHorriat_4f
Sun Feb 02, 2020 11:45 pm
Forum: Calculating Work of Expansion
Topic: Reversible
Replies: 7
Views: 58

Reversible

In the notes, It says since a system is at equilibrium it is a reversible process? What does that mean? What is not a reversible process? What is the importance of it becoming a reversible process?
by JustinHorriat_4f
Sun Feb 02, 2020 11:35 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Gases vs liquids and solids
Replies: 1
Views: 18

Gases vs liquids and solids

Why are we not able to calculate the change in enthalpy, work, temperature, etc. in liquid and solids? Why is it only gases?
by JustinHorriat_4f
Sun Feb 02, 2020 11:30 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: q and w
Replies: 10
Views: 91

q and w

When reading questions, is there a quick trick we can use to quickly know if we are gonna end up with a positive or negative q and a positive or negative w?
by JustinHorriat_4f
Sun Feb 02, 2020 11:27 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Changing energy of systems
Replies: 1
Views: 16

Changing energy of systems

I am still confused on the different kinds of systems and how we change energy in each of them. In the notes it says we do work on a system only in a closed system. Why cant we do work on an open system. It also says we only heat or cool a closed system, Why?
by JustinHorriat_4f
Sun Jan 26, 2020 11:32 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: checking approximation
Replies: 4
Views: 36

checking approximation

If the K of reaction is less than 10^-3, but when you check your approximation and it is more than 5%, then does that mean you can't approximate and have to use the quadratic formula?
by JustinHorriat_4f
Sun Jan 26, 2020 11:29 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard enthalpy of formation
Replies: 1
Views: 22

Standard enthalpy of formation

If by definition, the standard enthalpy of formation of an element in its most stable form is zero, and the standard enthalpy of 02 is zero, then does that mean Graphite which is the most stable form of C has a standard enthalpy of formation? Also, when will we know when things are in their most sta...
by JustinHorriat_4f
Sun Jan 26, 2020 11:24 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: pressure and enthalpy
Replies: 5
Views: 40

pressure and enthalpy

how exactly is enthalpy affected by pressure?
by JustinHorriat_4f
Sun Jan 26, 2020 11:21 pm
Forum: Phase Changes & Related Calculations
Topic: Temp. of sample
Replies: 4
Views: 27

Temp. of sample

What exact did Dr. Lavelle mean when he said because heat is required during melting or boiling, the temp of sample remains constant even though heat is being supplied. Did he mean it stays constant until the transition is complete? Like what is a real life example of this?
by JustinHorriat_4f
Sun Jan 26, 2020 11:19 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Method 2 example
Replies: 3
Views: 23

Method 2 example

In the method 2 example with CH2=Ch2, is the reason he doesn't include the bond enthalpy of the C-H bonds on the reactants side of the equation is because the products side has one more C-H bonds than the reactants side?
by JustinHorriat_4f
Sun Jan 19, 2020 11:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: pKa and pH
Replies: 1
Views: 25

Re: pKa and pH

The pH and pka are related in that the lower the pH, the higher the concentration of hydrogen ions, and the the lower the pKa, the stronger the acid and the greater its ability to donate protons. So both can describe a strong acid. However, pH depends on concentrations of the solution, while the pKa...
by JustinHorriat_4f
Sun Jan 19, 2020 10:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE tables for reverse rxns
Replies: 4
Views: 27

Re: ICE tables for reverse rxns

You would treat the reverse reaction just how you treated the front reaction. You have initial concentrations and the only difference is that you minus x from the products and add x to the reactants, and then use the equallibrum concentrations and your K to solve for x.
by JustinHorriat_4f
Sun Jan 19, 2020 10:49 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Approximations
Replies: 2
Views: 16

Approximations

Lets say the equilibrium concentration for a reactant is 0.155-x and we can approximate, when we approximate and we get rid of the minus x, do we still include the minus x, when we are asked what the final solution for the reactant?
by JustinHorriat_4f
Sun Jan 19, 2020 10:46 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Adding a molecule thats not in reaction
Replies: 2
Views: 24

Adding a molecule thats not in reaction

Would adding a molecule that is not in the reaction affect the production of products or reactants because there is more pressure in the system?
by JustinHorriat_4f
Sun Jan 19, 2020 10:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: KNO2 and buffers
Replies: 2
Views: 29

KNO2 and buffers

Does NO2- pick up a proton and make the solution basic? How do buffers work? Are they used to neutralize a salt?
by JustinHorriat_4f
Sun Jan 12, 2020 7:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: stoichiometric coefficients
Replies: 5
Views: 44

stoichiometric coefficients

how are stoichiometric coefficients involved in Equilibrium? Why when they are the same, its still in equilibrium?
by JustinHorriat_4f
Sun Jan 12, 2020 6:58 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Inert gas
Replies: 6
Views: 53

Inert gas

What is the explanation behind why when inert gas is added and pressure increases, reactant product and volume still stay the same?
by JustinHorriat_4f
Sun Jan 12, 2020 6:57 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: "Quick way" part in Lecture
Replies: 7
Views: 64

"Quick way" part in Lecture

What are examples that can differentiate when it says " V decreases and more moles of gas on left" and "V decreases, and more moles of gas on right"? I was very confused when looking over my notes again.
by JustinHorriat_4f
Sun Jan 12, 2020 6:56 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pressure and volume
Replies: 4
Views: 32

pressure and volume

How are pressure and volume related, why when you double P that means Volume is halved.
by JustinHorriat_4f
Sun Jan 12, 2020 6:54 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: increasing yield of NH3
Replies: 3
Views: 42

Re: increasing yield of NH3

To increase yield of NH3, you would need to increase the amount of reactants
by JustinHorriat_4f
Sat Dec 07, 2019 11:27 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Double bond oxygen
Replies: 1
Views: 72

Double bond oxygen

Why isn't a oxygen that has lone pairs but is double bonded to something not considered a ligand?
by JustinHorriat_4f
Sat Dec 07, 2019 11:23 pm
Forum: Ionic & Covalent Bonds
Topic: Coulombs equation
Replies: 1
Views: 93

Coulombs equation

Can somebody explain Coulombs equation to me? What do the q1 and q2 stand for?
by JustinHorriat_4f
Sat Dec 07, 2019 11:21 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: different acids
Replies: 1
Views: 94

different acids

Does anyone know,if for the test we need to know the different formulas for acetic acid, formic acid, and different kinds of acids like that
by JustinHorriat_4f
Fri Dec 06, 2019 1:08 am
Forum: Octet Exceptions
Topic: Incomplete octets
Replies: 1
Views: 87

Incomplete octets

Why are incomplete octets formed? Like whats the reasoning behind how they are able to be formed?
by JustinHorriat_4f
Fri Dec 06, 2019 1:07 am
Forum: Ionic & Covalent Bonds
Topic: Coulombs equation
Replies: 1
Views: 85

Coulombs equation

Can someone explain coulombs equation to me?
It says F(e)=(kQ1Q2)/r^2
by JustinHorriat_4f
Fri Dec 06, 2019 1:05 am
Forum: Properties of Light
Topic: Light Absorbed/ emitted
Replies: 4
Views: 142

Light Absorbed/ emitted

When is light emitted and when is it absorbed. Why was it positive on the midterm when light is absorbed? And What does it mean for light to be emitted or absorbed?
by JustinHorriat_4f
Sun Dec 01, 2019 11:50 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Lecture
Replies: 3
Views: 51

Lecture

Can someone explain to me what Professor Lavelle meant when he said "Resulting anion must be stable, and that oxyacids more readily lose H+ if resulting anion is stabilized by e- withdrawing atoms which decline and stabilize negative charge."
by JustinHorriat_4f
Sun Dec 01, 2019 11:46 pm
Forum: Bronsted Acids & Bases
Topic: Equilibrium Arrows for Strong Acid/Base Equations
Replies: 1
Views: 27

Re: Equilibrium Arrows for Strong Acid/Base Equations

During lecture, Professor Lavelle said it would usually be a singe arrow if its a strong acid or base because it is completely dissociating, however if you but the equilibrium arrows it is technically not wrong as long as you explain that it is a strong acid and it is mostly a forward reaction.
by JustinHorriat_4f
Sun Dec 01, 2019 11:44 pm
Forum: Polyprotic Acids & Bases
Topic: Polyprotic acids and bases
Replies: 2
Views: 130

Polyprotic acids and bases

Hi, I know this is a dumb question, but what are polyprtoic acids and bases in simple terms. Can you also give examples?
by JustinHorriat_4f
Sun Dec 01, 2019 11:31 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: TEST 2 POLAR molecule
Replies: 6
Views: 57

TEST 2 POLAR molecule

Why is the molecule that shows the lewis structure of CCl2H2 a polar molecule, I thought that the Cl atoms are pulling different ways so it makes the overall molecule non polar? I think the question number was 6.
by JustinHorriat_4f
Sun Dec 01, 2019 11:26 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acting as a base
Replies: 1
Views: 39

Re: Acting as a base

According to the lewis definition, as long as it has an electron pair to donate it can be considered a base, but there are exceptions such as nobles gases who do have lone pairs but don't act as a base.
by JustinHorriat_4f
Sun Dec 01, 2019 11:19 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acid and water
Replies: 2
Views: 34

Acid and water

When an Acid combines with water, does it always yield H30+ and when doing pH and your giving the concentration of H30+, do you take the negative log of that to find the pH?
by JustinHorriat_4f
Sun Nov 24, 2019 11:17 pm
Forum: Naming
Topic: adding O
Replies: 3
Views: 41

Re: adding O

If thats true then why for his example of [Co(NH3)5Cl]CL.2H2O he said it was Penta Ammine Chloro Cobalt II Chloride DiHydrate. Why is the chloride not Chloro?
by JustinHorriat_4f
Sun Nov 24, 2019 11:12 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: lecture notes
Replies: 2
Views: 33

lecture notes

Can someone explain what Professor Lavelle was talking about when he said that 6 ligands at the corners of an octahedron: octahedral complex. Can someone give me an example of this. Also when eh says 4 ligands at corners of tetrahedron form a tetrahedral complex.
by JustinHorriat_4f
Sun Nov 24, 2019 11:08 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordination complexes
Replies: 3
Views: 33

Re: Coordination complexes

A coordination complex is just basically a product of a lewis acid-base reaction where Lewis bases, which are the neutral atoms that have lone pairs to donate to a lewis acid, which are the transition metals. The bonds that they form are coordinate covalent bonds.
by JustinHorriat_4f
Sun Nov 24, 2019 11:01 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 4
Views: 42

Re: Ligands

A ligand is basically an ion or molecule that binds to a central atom that is usually a transition metal to form a coordination complex. The Ligand is the one that has the extra lone pair and is the lone pair donor.
by JustinHorriat_4f
Sun Nov 24, 2019 3:50 pm
Forum: Naming
Topic: Coordination number
Replies: 7
Views: 57

Coordination number

I am a bit confused on what determines coordination compound. Can anyone give me an example and explain. Thank you!
by JustinHorriat_4f
Sun Nov 17, 2019 11:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: electronegativity
Replies: 6
Views: 44

Re: electronegativity

It goes along the same guidelines as ionization energy. smaller molecule, with a greater nuclear charge, will attracts its electrons more.
by JustinHorriat_4f
Sun Nov 17, 2019 11:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: electronegativity
Replies: 6
Views: 44

Re: electronegativity

there is a pattern in the periodic table, as you go up and right, the electronegativity of the atoms rise. But basically, its the how much an atom attracts electrons. And this electronegativity is determined by looking at its atomic number (nuclear charge) and the amount of valence electrons.
by JustinHorriat_4f
Sun Nov 17, 2019 11:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSPER
Replies: 7
Views: 76

Re: VSPER

An even simpler explanation is that it is basically the shapes of molecules when taking in consideration that electrons have repulsion and that a molecule tries to minimizes this repulsion by arranging its bonds and lone pairs that it has around the central atom. Its basically just a very simple dra...
by JustinHorriat_4f
Sun Nov 17, 2019 11:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polar vs non polar
Replies: 6
Views: 67

polar vs non polar

Can we distinguish a polar molecule between a non polar molecules by just looking at the bonds inside the molecule and see if the there is dipole moments and if they cancel out, or can we just have to know right away by how the structure is drawn?
by JustinHorriat_4f
Sun Nov 17, 2019 11:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: sulfite vs NH3
Replies: 2
Views: 42

sulfite vs NH3

Why in the lecture the bond angles for sulfite which has 3 bond pairs and one lone pair, is different than the NH3 which also has 3 bond pairs and 1 lone pair
by JustinHorriat_4f
Sun Nov 17, 2019 11:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 9
Views: 77

Bond Angles

Will we have to memorize all the bond angles for each of the shapes? If so, does anyone know a quick and easy way because I keep mixing them up?
by JustinHorriat_4f
Sun Nov 10, 2019 11:44 pm
Forum: Quantum Numbers and The H-Atom
Topic: The spin of a quantum number
Replies: 6
Views: 149

Re: The spin of a quantum number

If u are asked what spin a certain electron has in its orbital, you won't be able to tell. However, when filling out orbitals, electrons first fill different orbitals and have an up spin, and then after complete the filling of the orbitals with down spin electrons. So you can tell which spin the las...
by JustinHorriat_4f
Sun Nov 10, 2019 10:45 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
Replies: 1
Views: 28

Re: 3F. 1

Basically, the different intermolecular forces are london dispersion, hydrogen bonding, and dipole-dipole. For a) there would be hydrogen bonding between two molecules of this because of the H-N Bonds, also there would be dipole-dipole because of the dipole moments of this molecule, and obviously lo...
by JustinHorriat_4f
Sun Nov 10, 2019 10:38 pm
Forum: Empirical & Molecular Formulas
Topic: Midterm question 1
Replies: 6
Views: 216

Midterm question 1

Does anyone know how they did question 1, the empirical formula one, on the midterm? I did not know how I was able to take the grams of some of the products and use mole to mole ratio to go to the empirical formula for the reactant.
by JustinHorriat_4f
Wed Nov 06, 2019 1:52 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Delta E
Replies: 1
Views: 41

Delta E

When Delta E is negative what does that mean? Does that mean that emission vs it being positive which means absorption? Also when an electron is excited to a higher level, does that mean delta E would be positive?
by JustinHorriat_4f
Sun Nov 03, 2019 11:58 pm
Forum: Properties of Electrons
Topic: Molecular spectroscopy
Replies: 1
Views: 122

Re: Molecular spectroscopy

They are actually very similar but basically in molecular spectroscopy, it is the study of light by molecules. it is saying that electrons in molecules can be excite to higher energy states. In atomic spec, it is the interactions of this but in atoms, matter that is independent of bonds.
by JustinHorriat_4f
Sun Nov 03, 2019 11:44 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent bonds
Replies: 1
Views: 33

Ionic and Covalent bonds

Why are ionic compounds made from a metal to a nonmetal and why are covalent bonds made from non-metals only? What is the reasoning? Also, is this rule always true?
by JustinHorriat_4f
Sun Nov 03, 2019 11:40 pm
Forum: Octet Exceptions
Topic: Lewis Acids and Bases?
Replies: 11
Views: 113

Lewis Acids and Bases?

Can someone Explain what Lewis Acids and Bases are and why they are an exception to the often rule? Also, what different rxns are they involved in?
by JustinHorriat_4f
Sun Nov 03, 2019 11:30 pm
Forum: DeBroglie Equation
Topic: Dino Nuggets 6a
Replies: 1
Views: 81

Dino Nuggets 6a

The question says, "A new element GarBreadium is discovered to have molar mass 3.157 g∙mol-1. The GarBreadium atom travels at an average speed of 1.35x103 m∙s-1 at room temperature. What is the average wavelength of the GarBreadium atom at room temperature?" What is the mass of the atom? a...
by JustinHorriat_4f
Sun Nov 03, 2019 11:26 pm
Forum: Octet Exceptions
Topic: Radicals
Replies: 5
Views: 74

Radicals

Why do Radicals happen? Also, What do we have to know about them for our midterm?
by JustinHorriat_4f
Mon Oct 28, 2019 12:13 am
Forum: *Shrodinger Equation
Topic: wave function
Replies: 3
Views: 124

wave function

do we need to know the wavefunctions equations, and the potential energy equation? If so can someone explain them to me? and whats their purpose?
by JustinHorriat_4f
Sun Oct 27, 2019 11:58 pm
Forum: Photoelectric Effect
Topic: photoelectric effect book example
Replies: 2
Views: 42

photoelectric effect book example

An example in the book in 1B it says You need to make some estimates of the physical properties involved. The speed of an electron emitted from the surface of a sample of potassium by a photon is 668 km?s21. (a) What is the kinetic energy of the ejected electron?, and in the answer in the book it sa...
by JustinHorriat_4f
Sun Oct 27, 2019 5:02 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic v Covalent Bond
Replies: 3
Views: 113

Re: Ionic v Covalent Bond

basically every atom has an electronegativity, which is how much an atom attracts electrons. Therefore the reason it says if the electronegativity difference is more than 2 consider it ionic is because at that point the electrons are not being shared anymore and instead one atom takes the electron w...
by JustinHorriat_4f
Sun Oct 27, 2019 4:56 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Vs. Oxidation Number
Replies: 4
Views: 60

Re: Formal Charge Vs. Oxidation Number

Basically they are very similar the only big difference is that formal charge assumes all the bonding electrons were divided equally between atoms while in oxidation numbers we assign numbers to the more electronegative atom in the bond.
by JustinHorriat_4f
Sun Oct 27, 2019 4:52 pm
Forum: Octet Exceptions
Topic: Octet rule exception
Replies: 2
Views: 26

Octet rule exception

Professor Lavelle was talking about exceptions to the octet rule because they have a d-orbital, does this mean every atom with a d orbital has an exception to the octet rule. Also, do these exceptions affect the drawings of lewis structure so that there are more than 8 electrons around an atom?
by JustinHorriat_4f
Sun Oct 20, 2019 12:17 pm
Forum: Quantum Numbers and The H-Atom
Topic: d orbitals
Replies: 4
Views: 84

d orbitals

Why do electrons in the d orbitals have less energy than electrons in the s orbitals such as why does it go 3d^2 4s^2
by JustinHorriat_4f
Sat Oct 19, 2019 3:57 pm
Forum: Properties of Electrons
Topic: Velocity
Replies: 1
Views: 52

Velocity

Can someone explain how velocity plays a role in wavelength and electrons as a whole? Like i get the equation but can someone explain the concept behind the equation.
by JustinHorriat_4f
Sat Oct 19, 2019 3:51 pm
Forum: Properties of Electrons
Topic: Balmar and Lyman series
Replies: 2
Views: 53

Balmar and Lyman series

For the series I don't understand when the question says N(1)= 2 and N(2)= 3,4 what does the n(1) and N(2) stand for.
by JustinHorriat_4f
Sat Oct 19, 2019 3:41 pm
Forum: Properties of Electrons
Topic: Photo and electron energy
Replies: 4
Views: 48

Photo and electron energy

Does the energy difference between to energy levels have to be exact for the energy to be absorbed? Like what happens when the photons energy is more than the energy difference between energy level? Is that where the equation E(excess)= E(photon)-E(energy to remove e-)
by JustinHorriat_4f
Tue Oct 15, 2019 9:11 pm
Forum: Properties of Light
Topic: Defraction patters
Replies: 3
Views: 75

Defraction patters

I am a bit confused about diffraction patters and wavelike properties. Do both light and electrons have wave like properties? If so, does that mean they both have Difraction patterns. Also, what are diffraction patters?

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