Search found 103 matches

by Anthony Hatashita 4H
Sat Mar 14, 2020 6:26 pm
Forum: Balancing Redox Reactions
Topic: Pt in Cell Diagram
Replies: 10
Views: 79

Pt in Cell Diagram

When do we use Pt in a cell diagram?
by Anthony Hatashita 4H
Fri Mar 13, 2020 10:35 pm
Forum: First Order Reactions
Topic: size
Replies: 6
Views: 36

Re: size

It's possible given that it would be able to come into contact with more at one time, but for this class I'm pretty sure just the stoichiometric coefficients matter.
by Anthony Hatashita 4H
Fri Mar 13, 2020 10:34 pm
Forum: First Order Reactions
Topic: Half Life
Replies: 13
Views: 53

Re: Half Life

Half lives are useful for lots of real world applications. If asked for in a question it would ask for it explicitly and the equations should be on the equation sheet.
by Anthony Hatashita 4H
Fri Mar 13, 2020 10:31 pm
Forum: First Order Reactions
Topic: rate constants
Replies: 19
Views: 122

Re: rate constants

Rate constants are always positive because they are based off time and concentrations which are always positive.
by Anthony Hatashita 4H
Fri Mar 13, 2020 12:36 pm
Forum: Student Social/Study Group
Topic: final?
Replies: 7
Views: 94

Re: final?

I had the same question, hopefully it isn't too complicated. If it's take home I'm assuming we have to take pictures and submit that way? I'm not sure.
by Anthony Hatashita 4H
Fri Mar 13, 2020 11:18 am
Forum: *Identifying Primary, Secondary, Tertiary, Quaternary Carbons, Hydrogens, Nitrogens
Topic: Will the Final for 14B have Identification?
Replies: 8
Views: 92

Re: Will the Final for 14B have Identification?

He never went over it in class and the topic has an asterisk next to it meaning we don't need to know this.
by Anthony Hatashita 4H
Fri Mar 06, 2020 12:11 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Finding Q
Replies: 7
Views: 77

Re: Finding Q

Q is anode/cathode usually. You can write out the full reaction equation to verify on a case to case basis.
by Anthony Hatashita 4H
Fri Mar 06, 2020 12:09 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Nernst
Replies: 10
Views: 108

Re: Nernst

You can use either, the equation sheet lists both so whichever you are most comfortable using is best.
by Anthony Hatashita 4H
Fri Mar 06, 2020 12:06 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Cell potential
Replies: 6
Views: 50

Re: Cell potential

Adding water will decrease the concentration of everyone else, changing the value of Q which changes cell potential.
by Anthony Hatashita 4H
Fri Mar 06, 2020 12:01 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: Calculating ln Q
Replies: 20
Views: 178

Re: Calculating ln Q

Q is the concentration of product divided by the concentration of reactant. [product]/[reactant]. Lots of questions will give you the concentrations and you'll be able to solve from there.
by Anthony Hatashita 4H
Fri Feb 28, 2020 12:59 am
Forum: Balancing Redox Reactions
Topic: 6K. 5b
Replies: 3
Views: 28

Re: 6K. 5b

The equations should be as follows:
12OH- + Br2 → 2BrO3- + 6H2O + 10e-
5 x (Br2 + 2e- → 2Br-)
I'm not sure where you got the H from when you did your calculations, maybe you forgot that this was in a basic solution? You use H2O and OH- to balance the H on each side.
by Anthony Hatashita 4H
Fri Feb 28, 2020 12:54 am
Forum: Balancing Redox Reactions
Topic: How to tell if its being reduced or oxidized
Replies: 15
Views: 89

Re: How to tell if its being reduced or oxidized

You have to look at the charge of Mn, not the entire compound. In this case, Mn goes from +7 to +2 and is being reduced.
by Anthony Hatashita 4H
Thu Feb 27, 2020 8:56 pm
Forum: Balancing Redox Reactions
Topic: homework 6K.3
Replies: 1
Views: 21

Re: homework 6K.3

I think it's supposed to be Cl2 -> Cl-. I ran into that problem as well but the answer book shows Cl- and I got the right answer doing this.
by Anthony Hatashita 4H
Thu Feb 27, 2020 8:55 pm
Forum: Balancing Redox Reactions
Topic: 6K. 5a)
Replies: 5
Views: 42

Re: 6K. 5a)

Because it's a basic solution, in order to add more H to one side you need to add H2O to that side and OH- to the other, resulting in one more H per H2O molecule on that side while leaving the O balanced.
by Anthony Hatashita 4H
Thu Feb 27, 2020 8:00 pm
Forum: Balancing Redox Reactions
Topic: 6k3d
Replies: 3
Views: 26

Re: 6k3d

I saw this and thought the same thing and I think you're right. The answer key has Cl- in it while the question itself does not.
by Anthony Hatashita 4H
Thu Feb 20, 2020 6:59 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: galvanic cell structure
Replies: 8
Views: 44

Re: galvanic cell structure

Anodes are more negative and cathodes are more positive, so the electrons naturally go from anode to cathode. Cathodes get reduced and anodes get oxidized.
by Anthony Hatashita 4H
Thu Feb 20, 2020 6:57 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Galvanic Cells
Replies: 8
Views: 41

Galvanic Cells

What is the purpose of galvanic cells? Is it just to do work on something or is there more than that?
by Anthony Hatashita 4H
Thu Feb 20, 2020 6:55 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: cell diagram
Replies: 4
Views: 42

Re: cell diagram

So the order of a cell diagram would be solid|gas|aqueous || aqueous|gas|solid. The two lines in the middle represent the salt bridge and the left side represents the anode and the right side represents the cathode. A cell bridge is just another way to represent the transfer of electrons from an an...
by Anthony Hatashita 4H
Thu Feb 20, 2020 6:53 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: salt bridge
Replies: 5
Views: 40

Re: salt bridge

I think that's the main thing that we need to know about salt bridges, but you should probably also know how to recognize a salt bridge in a cell diagram.
by Anthony Hatashita 4H
Thu Feb 20, 2020 6:50 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Purpose of Salt Bridge
Replies: 12
Views: 63

Re: Purpose of Salt Bridge

When electrons move, the salt bridge helps balance the charges of the two solutions.
by Anthony Hatashita 4H
Sat Feb 15, 2020 3:08 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: 4I.9
Replies: 3
Views: 53

Re: 4I.9

ΔS is a state function, so they are the same either way. In irreversible however, ΔSsurr=0.
by Anthony Hatashita 4H
Sat Feb 15, 2020 3:06 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: P1/P2
Replies: 10
Views: 119

Re: P1/P2

Pressure and volume always have an inverse relationship, so it's P1/P2 instead of vice versa.
by Anthony Hatashita 4H
Sat Feb 15, 2020 3:05 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Irreversible, Adiabatic
Replies: 3
Views: 36

Re: Irreversible, Adiabatic

For the surroundings it's 0, the system is W=-PDeltaV I believe. I'm not sure about the second part of your question though, sorry about that.
by Anthony Hatashita 4H
Sat Feb 15, 2020 3:01 am
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Delta S
Replies: 4
Views: 43

Re: Delta S

For reversible, the reaction is able to go in the reverse direction afterwards which means work has to be done on it by the surroundings to return, or at least that's how I think of it, which means that ΔSsys=-ΔSsurr.
by Anthony Hatashita 4H
Sat Feb 15, 2020 2:59 am
Forum: Calculating Work of Expansion
Topic: Reversible vs Irreversible
Replies: 13
Views: 133

Re: Reversible vs Irreversible

For reversible, delta S of the system is equal to -delta S of the surroundings.
by Anthony Hatashita 4H
Thu Feb 06, 2020 8:09 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 4A.7
Replies: 2
Views: 34

Re: 4A.7

You can think of this as two parts, first heating up the kettle, then heating up the water. You just need to add the two values you get for each part to get the final answer.
by Anthony Hatashita 4H
Thu Feb 06, 2020 8:07 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Equations
Replies: 4
Views: 42

Re: Equations

The equations we need will be on the equations and constants sheet given to us for exams.
by Anthony Hatashita 4H
Thu Feb 06, 2020 8:06 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Work done on or by the system
Replies: 4
Views: 32

Re: Work done on or by the system

If the system is doing work, it is losing energy, so it is negative. Think of it with yourself as the system, if you open a door you are transferring energy to the door, losing energy yourself (-).
by Anthony Hatashita 4H
Thu Feb 06, 2020 8:03 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Delta U equals zero
Replies: 7
Views: 69

Re: Delta U equals zero

Considering the first law equation, work and heat would have to equal 0. For an isothermal process, heat is 0, so if there is a reaction that is isothermal that does no work, delta U should be 0.
by Anthony Hatashita 4H
Thu Feb 06, 2020 7:59 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 4B.5 Conversion
Replies: 4
Views: 34

Re: 4B.5 Conversion

1 Torr = 0.001316 atm, so you can convert to atm by multiplying 750 by 0.001316, giving 0.987 atm.
by Anthony Hatashita 4H
Thu Jan 30, 2020 8:07 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: adiabatic systems
Replies: 10
Views: 342

Re: adiabatic systems

Adiabatic means there is no heat exchange, however there can already be heat within the system.
by Anthony Hatashita 4H
Thu Jan 30, 2020 8:06 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Heat Supplied to a system
Replies: 6
Views: 55

Re: Heat Supplied to a system

Think of this problem as having two parts: first you heat up the copper, then the water. You add up the change in energy for both of them to find the total.
by Anthony Hatashita 4H
Thu Jan 30, 2020 8:05 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Increasing energy in an open system
Replies: 7
Views: 32

Re: Increasing energy in an open system

Increasing energy in an open system can be done by adding or removing a substance, heating or cooling the system, doing work on the system or vice versa.
by Anthony Hatashita 4H
Thu Jan 30, 2020 8:03 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated Systems
Replies: 5
Views: 32

Re: Isolated Systems

With an isolated system you can still observe changes happening within without interruption or influence from outside the system.
by Anthony Hatashita 4H
Thu Jan 30, 2020 8:02 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 4A.1
Replies: 12
Views: 55

Re: 4A.1

Isolated systems cannot exchange energy with their surroundings. Think of a thermos retaining heat, it counts as an isolated system because the energy transfer from within to outside is negligible.
by Anthony Hatashita 4H
Thu Jan 30, 2020 8:00 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 4A.3 part c
Replies: 4
Views: 44

Re: 4A.3 part c

My solution manual says 28J, so I think you may have misread something.
by Anthony Hatashita 4H
Thu Jan 30, 2020 7:59 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 4a.1
Replies: 3
Views: 47

Re: 4a.1

When I first did this problem I thought that a) would be closed since it can't be completely isolated, but it's close enough to completely isolated to count.
by Anthony Hatashita 4H
Thu Jan 30, 2020 7:58 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: 4A.7
Replies: 3
Views: 30

Re: 4A.7

Think of it as two problems, heating up the copper and then heating up the water. You add the two together to get the total.
by Anthony Hatashita 4H
Thu Jan 30, 2020 7:57 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Isolated// Energy
Replies: 11
Views: 79

Re: Isolated// Energy

There can be reactions that happen within the isolated system, but no energy can leave or enter the system.
by Anthony Hatashita 4H
Thu Jan 30, 2020 7:56 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Closed and Isolated
Replies: 5
Views: 28

Re: Closed and Isolated

I don't think there's a way for something to be completely isolated, but if it's close enough the difference is negligible.
by Anthony Hatashita 4H
Thu Jan 16, 2020 10:47 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: acidity and basicity constant
Replies: 4
Views: 22

Re: acidity and basicity constant

If they're the same then why do we have different names for them? Just to clarify?
by Anthony Hatashita 4H
Thu Jan 16, 2020 10:46 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Solids and Equilibrium
Replies: 9
Views: 51

Re: Solids and Equilibrium

They don't affect either because they are pure and don't change in reactions.
by Anthony Hatashita 4H
Thu Jan 16, 2020 10:44 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: H3O+
Replies: 4
Views: 23

Re: H3O+

H+ and H30+ are interchangable for us I believe. H+ is just H30+ without the water.
by Anthony Hatashita 4H
Thu Jan 16, 2020 10:42 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5 percent rule
Replies: 10
Views: 73

Re: 5 percent rule

The percent protonization or deprotonization needs to be less than 5% for the x value to be valid; it makes it acceptable to use approximations.
by Anthony Hatashita 4H
Thu Jan 16, 2020 10:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc & Kp
Replies: 12
Views: 75

Re: Kc & Kp

I think we use Kp when all of the reactants and products are gases.
by Anthony Hatashita 4H
Fri Jan 10, 2020 10:49 pm
Forum: Ideal Gases
Topic: pressure [ENDORSED]
Replies: 13
Views: 233

Re: pressure [ENDORSED]

I think if you increase the amount of gas or increase the temperature it also increases temperature.
by Anthony Hatashita 4H
Fri Jan 10, 2020 10:47 pm
Forum: Ideal Gases
Topic: Solving for K (coefficients)
Replies: 11
Views: 74

Re: Solving for K (coefficients)

Just make sure the coefficients for specific molecules remain on the same molecules as a power when calculating K.
by Anthony Hatashita 4H
Fri Jan 10, 2020 10:44 pm
Forum: Ideal Gases
Topic: R in PV=nRT
Replies: 34
Views: 486

Re: R in PV=nRT

It's a constant and should be given with any exams so I don't think we need to worry too much about it.
by Anthony Hatashita 4H
Fri Jan 10, 2020 10:42 pm
Forum: Ideal Gases
Topic: Ideal Gas Law
Replies: 6
Views: 41

Re: Ideal Gas Law

If we are given partial pressure but need concentration or vice versa it helps us convert between the two.
by Anthony Hatashita 4H
Fri Jan 10, 2020 10:42 pm
Forum: Ideal Gases
Topic: K value
Replies: 14
Views: 84

Re: K value

Large K value means that the reaction shifts to the right, small K value means the opposite.
by Anthony Hatashita 4H
Sat Dec 07, 2019 3:16 pm
Forum: Polyprotic Acids & Bases
Topic: Calculating pH of polyprotic acid
Replies: 2
Views: 55

Calculating pH of polyprotic acid

The textbook says that we only use the first deprotonation equilibrium for polyprotic acids except for sulfuric acid, so do we just calculate the pH of these acids just as we would for monoprotic acids?
by Anthony Hatashita 4H
Fri Dec 06, 2019 12:38 pm
Forum: Naming
Topic: Name --> formula
Replies: 2
Views: 24

Re: Name --> formula

I don't think this is explicitly stated anywhere but I would do alphabetical order just in case, don't wanna lose free points on the final
by Anthony Hatashita 4H
Fri Dec 06, 2019 12:37 pm
Forum: Naming
Topic: Adding -ate to end of transition metal
Replies: 2
Views: 21

Re: Adding -ate to end of transition metal

Yes, for example cobalt is cobalate and copper is ferrate.
by Anthony Hatashita 4H
Fri Dec 06, 2019 12:36 pm
Forum: Naming
Topic: naming
Replies: 3
Views: 38

Re: naming

Don't use the prefixes when listing in alphabetical order
by Anthony Hatashita 4H
Fri Dec 06, 2019 12:03 pm
Forum: Naming
Topic: Writing formulas for coordination compounds
Replies: 2
Views: 27

Re: Writing formulas for coordination compounds

I think it would say if there was an overall charge, indicated by brackets
by Anthony Hatashita 4H
Fri Dec 06, 2019 12:01 pm
Forum: Naming
Topic: Cyanido vs cyano
Replies: 5
Views: 50

Re: Cyanido vs cyano

They are interchangable and should give the same points on a test
by Anthony Hatashita 4H
Fri Dec 06, 2019 11:54 am
Forum: Naming
Topic: Using alternate Greek prefixes
Replies: 2
Views: 26

Re: Using alternate Greek prefixes

There's a table in the textbook that shows the most common polydendate ligands
by Anthony Hatashita 4H
Fri Dec 06, 2019 11:36 am
Forum: Naming
Topic: (diqaua)
Replies: 1
Views: 34

Re: (diqaua)

I wasn't sure on this one either, but I think it has to do with being polydendate? I'm not sure though.
by Anthony Hatashita 4H
Fri Dec 06, 2019 11:27 am
Forum: Naming
Topic: Adding -ate
Replies: 2
Views: 25

Re: Adding -ate

Cuprate for copper I believe
by Anthony Hatashita 4H
Fri Dec 06, 2019 11:23 am
Forum: Naming
Topic: Polyatomic ions
Replies: 2
Views: 24

Re: Polyatomic ions

It's probably a good idea to know them just in case, you never know what's gonna be on the final
by Anthony Hatashita 4H
Thu Dec 05, 2019 4:52 pm
Forum: Naming
Topic: 9C.1 a
Replies: 3
Views: 35

9C.1 a

Why do we use "cyano" instead of "cyanido?" Does it have to do with the bonds on the central atom for hexacyanoferrate(II)?
by Anthony Hatashita 4H
Fri Nov 22, 2019 3:06 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 8
Views: 76

Re: Lone Pairs

Lone pairs are equatorial usually, but for something like AX4E2 they are axial so they are farthest apart.
by Anthony Hatashita 4H
Fri Nov 22, 2019 3:04 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape of Diatomic Molecules
Replies: 5
Views: 42

Re: Shape of Diatomic Molecules

They should all be linear, two atoms together can only make a straight line between.
by Anthony Hatashita 4H
Fri Nov 22, 2019 3:02 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Which shape
Replies: 6
Views: 50

Re: Which shape

Dipoles have to cancel out or it will be polar. I think it helps to look for symmetry in molecules and atoms within molecules to find if something is polar.
by Anthony Hatashita 4H
Fri Nov 22, 2019 3:00 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 14
Views: 141

Re: Test 2

Does anyone have any advice about studying intermolecular forces?
by Anthony Hatashita 4H
Wed Nov 20, 2019 8:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test 2
Replies: 1
Views: 43

Test 2

What do we need to know for test 2? Everything covered after the midterm?
by Anthony Hatashita 4H
Thu Nov 14, 2019 7:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: format of test
Replies: 5
Views: 54

Re: format of test

I wouldn't imagine it being any different from previous tests.
by Anthony Hatashita 4H
Thu Nov 14, 2019 7:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.7
Replies: 3
Views: 42

Re: 2E.7

Bond angles are something you have to memorize, and I'm pretty sure the angles are determined by electron densities, not atomic attraction, but I'm not positive there.
by Anthony Hatashita 4H
Thu Nov 14, 2019 7:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Pyramid vs Trigonal Planar
Replies: 6
Views: 48

Re: Trigonal Pyramid vs Trigonal Planar

If there is a lone pair on the central atom, it makes the overall shape trigonal pyramidal, if there are no lone pairs on the central atom it's planar pretty sure.
by Anthony Hatashita 4H
Thu Nov 14, 2019 7:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.7
Replies: 2
Views: 31

Re: 2E.7

I think the answer is 1 because the bonds are the same angle, but I'm not sure.
by Anthony Hatashita 4H
Thu Nov 14, 2019 7:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Homework 2E.1
Replies: 4
Views: 42

Re: Homework 2E.1

When drawing the lewis structure, make sure to remember formal charges!
by Anthony Hatashita 4H
Thu Nov 07, 2019 5:25 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 10
Views: 81

Re: Expanded Octet

Element in the third period or further can have an expanded octet because the electrons and go into the d-orbital.
by Anthony Hatashita 4H
Thu Nov 07, 2019 5:25 pm
Forum: Lewis Structures
Topic: Exceptions for the octet rule
Replies: 5
Views: 72

Re: Exceptions for the octet rule

Anything in the third period or past that because they have an empty d shell that can be expanded into
by Anthony Hatashita 4H
Thu Nov 07, 2019 5:23 pm
Forum: Lewis Structures
Topic: Lewis structure
Replies: 5
Views: 47

Re: Lewis structure

O is more electronegative than P so it receives the negative charge, and you want the charges to be spread out, not on one atom usually
by Anthony Hatashita 4H
Thu Nov 07, 2019 5:19 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 4
Views: 64

Re: Expanded Octet

Yes, this is testable with calculating the formal charges of the atoms
by Anthony Hatashita 4H
Thu Nov 07, 2019 4:32 pm
Forum: Lewis Structures
Topic: Octet rule exceptions?
Replies: 4
Views: 43

Re: Octet rule exceptions?

I think it's the first elements where they simply don't have enough electrons to fill an octet and anything after the third period where expanded octets can occur.
by Anthony Hatashita 4H
Thu Oct 31, 2019 8:13 pm
Forum: Electronegativity
Topic: What does electronegativity affect?
Replies: 2
Views: 18

What does electronegativity affect?

I understand the trends on the periodic table, but what does a high electronegativity mean?
by Anthony Hatashita 4H
Thu Oct 31, 2019 8:11 pm
Forum: Ionic & Covalent Bonds
Topic: 2A.21
Replies: 4
Views: 47

Re: 2A.21

All of them have no unpaired electrons because the shells are filled, but there are some cases where 3d is filled with 8 electrons, leaving 2 unpaired electrons due to Hund's rule I believe.
by Anthony Hatashita 4H
Thu Oct 31, 2019 8:08 pm
Forum: Ionic & Covalent Bonds
Topic: 2A 5
Replies: 5
Views: 51

Re: 2A 5

For Ga+3 I believe the answer is [Ar]3d^10 because the 3d shell fills before the 4s does. You write the "largest" noble gas filled with electrons in brackets followed by the extra electrons.
by Anthony Hatashita 4H
Thu Oct 31, 2019 8:04 pm
Forum: Ionic & Covalent Bonds
Topic: 2A 19b
Replies: 3
Views: 39

Re: 2A 19b

The question asks about how many unpaired electrons Sn^4+ has, which is 0 because the entire 4d shell is full.
by Anthony Hatashita 4H
Thu Oct 31, 2019 8:01 pm
Forum: Ionic & Covalent Bonds
Topic: 2A 1
Replies: 5
Views: 54

Re: 2A 1

Mn has a ground state of [Ar]3d^7, hence the 7 valence electrons while Sb is [Kr]4d^10 5s^2 5p^3 with 5 valence electrons in the higher energy state.
by Anthony Hatashita 4H
Thu Oct 24, 2019 4:41 pm
Forum: Lewis Structures
Topic: Ion lewis structure
Replies: 9
Views: 83

Re: Ion lewis structure

It doesn't matter, just make sure you have the right amount of them.
by Anthony Hatashita 4H
Thu Oct 24, 2019 4:34 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic v.covalent bonds
Replies: 7
Views: 56

Re: Ionic v.covalent bonds

Yeah you're right, I think it also has to do with whether or not the electrons are shared between the atoms or just taken from one to the other as well.
by Anthony Hatashita 4H
Thu Oct 24, 2019 4:29 pm
Forum: Ionic & Covalent Bonds
Topic: valence electrons
Replies: 6
Views: 76

Re: valence electrons

I'm not sure to be honest, but I think it has to do with 4s, 4p, and 4d being filled, leaving 5s and 5p electrons.
by Anthony Hatashita 4H
Thu Oct 24, 2019 4:27 pm
Forum: Ionic & Covalent Bonds
Topic: Octet Rule
Replies: 6
Views: 64

Re: Octet Rule

They can't form an octet and never would in nature because they would never receive electrons for that, they are stable at lower values.
by Anthony Hatashita 4H
Thu Oct 24, 2019 4:25 pm
Forum: Ionic & Covalent Bonds
Topic: What's the difference between valence electrons and the valence of an atom?
Replies: 3
Views: 69

Re: What's the difference between valence electrons and the valence of an atom?

I think that means the number of covalent bonds an atom has, which is tightly related to the amount of valence electrons it has.
by Anthony Hatashita 4H
Thu Oct 17, 2019 6:59 pm
Forum: Properties of Light
Topic: Constant for Speed of Light
Replies: 14
Views: 131

Re: Constant for Speed of Light

2.998x10^8 is most accurate, but for some solutions in the manual it uses even more precise numbers. I think for the tests we're given the constants to use though so we should all be fine!
by Anthony Hatashita 4H
Thu Oct 17, 2019 6:58 pm
Forum: Properties of Light
Topic: Speed of light
Replies: 13
Views: 104

Re: Speed of light

Any EMR has the same speed, we just call it the speed of light (c)
by Anthony Hatashita 4H
Thu Oct 17, 2019 6:57 pm
Forum: Properties of Light
Topic: The units for each equation we're using?
Replies: 4
Views: 82

Re: The units for each equation we're using?

On the class website there's a link that says Constants and Equations, that should help you :)
by Anthony Hatashita 4H
Thu Oct 17, 2019 6:36 pm
Forum: Properties of Light
Topic: 1B #9
Replies: 5
Views: 58

Re: 1B #9

64 total Joules are emitted over 2 seconds, and we have all the information we need we need to find E=ch/(wavelength). After you find E, you can divide 64 by E to find out how many photons there are, and then you can divide that number by Avogadro's number, 6.022x10^23 to find the moles of photons.
by Anthony Hatashita 4H
Thu Oct 17, 2019 6:17 pm
Forum: Photoelectric Effect
Topic: HW 1B.5
Replies: 8
Views: 111

Re: HW 1B.5

So do we have to convert keV to J for all problems or is it specific to this one?
by Anthony Hatashita 4H
Thu Oct 10, 2019 5:20 pm
Forum: Properties of Light
Topic: 1.A.3 Hw Help
Replies: 3
Views: 50

Re: 1.A.3 Hw Help

You can eliminate a b and d through the process of elimination. I first looked at b but that's the opposite of the right answer. When the frequency decreases, the wavelength increases, so c is the correct answer as the change in the electrical field is lower at any point when the wavelength increases.
by Anthony Hatashita 4H
Thu Oct 10, 2019 5:09 pm
Forum: Properties of Light
Topic: Problem 1A, #15
Replies: 3
Views: 49

Re: Problem 1A, #15

From figure 1a.10 you know that the line in question is part of the Lyman series. From this you know that n1 is 1, and from there you find out that 1/n2^2 is around .111 or 1/9.
by Anthony Hatashita 4H
Thu Oct 10, 2019 4:44 pm
Forum: Properties of Light
Topic: HW 1A.11
Replies: 1
Views: 36

HW 1A.11

In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series or Lyman series, as shown in Fig. 1A.10). What is common to the lines within a series that makes grouping them together logical? I'm pretty sure the answer is beca...
by Anthony Hatashita 4H
Thu Oct 10, 2019 4:40 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Test 1 [ENDORSED]
Replies: 107
Views: 4005

Re: Test 1 [ENDORSED]

Do we have to memorize equations or are we given a list of equations?
by Anthony Hatashita 4H
Thu Oct 10, 2019 4:17 pm
Forum: Properties of Light
Topic: Question 1.A.3
Replies: 4
Views: 51

Re: Question 1.A.3

As I first did this problem I immediately looked for a "the wavelength increases" answer, but there was none. I also used the process of elimination to eliminate a b and d, leaving only c as the possible answer. From the correct answer you can learn that higher wavelength results in less c...
by Anthony Hatashita 4H
Thu Oct 03, 2019 5:54 pm
Forum: Balancing Chemical Reactions
Topic: Fractioned Chemical Equations?
Replies: 5
Views: 109

Re: Fractioned Chemical Equations?

From my understanding, yes you are correct. Using whole numbers just makes things easier to use or read for lab experiments or simple calculations.
by Anthony Hatashita 4H
Thu Oct 03, 2019 5:46 pm
Forum: SI Units, Unit Conversions
Topic: E.15
Replies: 2
Views: 42

E.15

The molar mass of the metal hydroxide M(OH)₂ is 74.10 g.mol. What is the molar mass of the sulfide of this metal?
What does it mean by the sulfide of this metal?

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