Search found 67 matches

by almaochoa2D
Sun Mar 17, 2019 3:43 pm
Forum: Balancing Redox Reactions
Topic: Triprotic
Replies: 7
Views: 72

Triprotic

Is a triprotic acid an acid with 3 hydrogens?
by almaochoa2D
Sun Mar 17, 2019 3:38 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Rate of consumption
Replies: 2
Views: 11

Rate of consumption

Is there a difference between rate or consumption of a reactant and the rate a product is formed?
by almaochoa2D
Sat Mar 16, 2019 6:01 pm
Forum: Balancing Redox Reactions
Topic: Emf
Replies: 1
Views: 8

Emf

Is emf E or Enot?
by almaochoa2D
Sun Mar 10, 2019 4:48 pm
Forum: Van't Hoff Equation
Topic: Equilibrium
Replies: 3
Views: 26

Re: Equilibrium

Van Hoff's can find a K value knowing two different temperature or it can find a temperature knowing two different K values.
by almaochoa2D
Sun Mar 10, 2019 4:44 pm
Forum: First Order Reactions
Topic: graph
Replies: 3
Views: 22

Re: graph

It changes based on whether it is integers or in ln form.
by almaochoa2D
Sun Mar 10, 2019 4:39 pm
Forum: Arrhenius Equation, Activation Energies, Catalysts
Topic: 15.63 Units with ln?
Replies: 1
Views: 7

Re: 15.63 Units with ln?

Make sure to write units when calculating. That makes it a lot easier to tell which units it's supposed to be. Also if you're given the order you can know what units k is suppose to be in.
by almaochoa2D
Mon Mar 04, 2019 11:06 am
Forum: Van't Hoff Equation
Topic: K value- Temp
Replies: 6
Views: 55

Re: K value- Temp

If you remember temperature is the only thing that can change K.
by almaochoa2D
Mon Mar 04, 2019 11:03 am
Forum: Appications of the Nernst Equation (e.g., Concentration Cells, Non-Standard Cell Potentials, Calculating Equilibrium Constants and pH)
Topic: van't hoff equation
Replies: 6
Views: 48

Re: van't hoff equation

you can find K. Then since you know either k2 or k1 you can just plug one into the other. K= K2/ K1
by almaochoa2D
Sun Feb 24, 2019 6:56 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox equations in Basic conditions
Replies: 3
Views: 47

Re: Balancing Redox equations in Basic conditions

You have to make everything is balanced. P4 is the reactant for both equations. After you've split the equations balance the O's then balance the H's and lastly balance the charges. In a basic solution, you add H2O and OH to balance the reactions. Then you add elections to whichever side has the lea...
by almaochoa2D
Sun Feb 24, 2019 9:17 am
Forum: Balancing Redox Reactions
Topic: 14.5b (6th ed)
Replies: 1
Views: 27

Re: 14.5b (6th ed)

Yes. Br2 is the reactant in both half reactions.
by almaochoa2D
Sun Feb 24, 2019 9:15 am
Forum: Balancing Redox Reactions
Topic: Standard Cell Potential
Replies: 3
Views: 27

Re: Standard Cell Potential

Also he might ask questions about the cathode and anode and the second method gives you a better understanding of what is going on.
by almaochoa2D
Sun Feb 24, 2019 9:11 am
Forum: Balancing Redox Reactions
Topic: 14.5d
Replies: 2
Views: 28

Re: 14.5d

I had trouble with this one too. With 6OH and 6H2O the equation is still not balanced that's why you need 12OH and 12 H2O.
by almaochoa2D
Sun Feb 17, 2019 5:57 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: calculating delta G
Replies: 4
Views: 42

Re: calculating delta G

What do you mean by "what kind you're doing"? I would think that it is always in kelvins.
by almaochoa2D
Sun Feb 17, 2019 5:55 pm
Forum: Van't Hoff Equation
Topic: Different Constants of Eqn
Replies: 3
Views: 46

Re: Different Constants of Eqn

Yes, T is constant. In general if there it is a delta change or a ratio of T there is a change in temperature, but if it is just T temperature is constant.
by almaochoa2D
Sun Feb 17, 2019 5:54 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibb's Free energy
Replies: 4
Views: 44

Re: Gibb's Free energy

Delta G is spontaneity. From what I understand is if delta G is spontaneous it is also endothermic and if delta G is negative it is not spontaneous and it is exothermic.
by almaochoa2D
Sun Feb 10, 2019 3:39 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: 3/2R and 5/2R
Replies: 5
Views: 63

Re: 3/2R and 5/2R

How do you know when to assume it is a monatomic gas?
by almaochoa2D
Sun Feb 10, 2019 3:37 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: delta H and q
Replies: 1
Views: 19

delta H and q

I'm very confused as to why the textbook inter changes between delta H and q. I thought they weren't the same thing, but for many solutions the textbook will substitute delta H for q. Can someone please explain to me why this is possible.
by almaochoa2D
Sun Feb 10, 2019 3:32 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Assumptions
Replies: 2
Views: 22

Assumptions

In the homework the textbook often assumes something is an ideal gas or the pressure is constant. How do we know when we can make assumptions like those?
by almaochoa2D
Sun Feb 03, 2019 9:05 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Units
Replies: 7
Views: 63

Units

Okay I feel really dumb for asking this but is J.C-1.mol-1 equal to J/C.mol or J/C/mol?
by almaochoa2D
Sun Feb 03, 2019 8:58 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: K vs. C in calculations
Replies: 2
Views: 35

Re: K vs. C in calculations

You need to always have the same units, but delta t is a change in final and initial and 1 C change is equivalent to 1 K change thats why you were able to calculate delta T in C because it is the same as in K.
by almaochoa2D
Sun Feb 03, 2019 8:52 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Clarification on Gibbs
Replies: 2
Views: 40

Re: Clarification on Gibbs

I don't think there is a part of the equation that accounts for attractive and repulsive forces on each other.
by almaochoa2D
Sat Jan 26, 2019 11:07 am
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess’s Law
Replies: 2
Views: 35

Re: Hess’s Law

Also you might have to switch some of the equations and make the products the reactants. If you do so make sure the multiply the enthalpy by -1 of the specific reaction.
by almaochoa2D
Sat Jan 26, 2019 11:06 am
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: heat capacity
Replies: 7
Views: 63

Re: heat capacity

Heat capacity just depends on the final and initial values that is why it is a state property.
by almaochoa2D
Wed Jan 23, 2019 10:33 pm
Forum: Ideal Gases
Topic: ICE Table Values
Replies: 9
Views: 90

Re: ICE Table Values

The ice tables can be used with moles, concentration, pressure but you need to make sure you know what you're using so that you can convert correctly at the end.
by almaochoa2D
Mon Jan 21, 2019 9:35 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Calculating pH of a weak acid and its salt
Replies: 4
Views: 56

Re: Calculating pH of a weak acid and its salt

yes, there is just an initial concentration for the salt as well as the weak acid. But the steps are the same.
by almaochoa2D
Mon Jan 21, 2019 9:30 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Temperature for Equilibrium
Replies: 4
Views: 36

Re: Temperature for Equilibrium

It depends on the molecules. For instance 25 degrees C is the equilibrium temperature for water.
by almaochoa2D
Mon Jan 21, 2019 9:28 am
Forum: Ideal Gases
Topic: 5% rule
Replies: 12
Views: 173

Re: 5% rule

you can still do the 5% rule he sort of did an example like this in lecture on Wednesday I believe.
by almaochoa2D
Mon Jan 21, 2019 9:25 am
Forum: Ideal Gases
Topic: ICE table
Replies: 11
Views: 96

Re: ICE table

You can use it for both you just need to pay attention to what you are using when coming up with a final answer.
by almaochoa2D
Sun Jan 13, 2019 8:39 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Determining Which side is favored
Replies: 5
Views: 58

Re: Determining Which side is favored

yes since there is more reactant more product will be formed.
by almaochoa2D
Sun Jan 13, 2019 8:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K value
Replies: 2
Views: 20

Re: K value

K value doesn't determine if its spontaneous or not.
by almaochoa2D
Sun Jan 13, 2019 8:34 pm
Forum: Ideal Gases
Topic: ICE Table
Replies: 4
Views: 38

Re: ICE Table

how do you know when your suppose to subtract just x or subtract something like 2x?
by almaochoa2D
Sun Dec 09, 2018 7:54 pm
Forum: Administrative Questions and Class Announcements
Topic: Final Grade View
Replies: 7
Views: 182

Re: Final Grade View

It depends on your TA. If you want to get you test back before we go to break email your TA.
by almaochoa2D
Sun Dec 09, 2018 7:52 pm
Forum: Lewis Acids & Bases
Topic: Stronger Acid
Replies: 1
Views: 31

Re: Stronger Acid

Cl is a large atom than F so that means the the bond length of HCl is longer than the bond length of HF so HCl has a weak bond. Since the bond is weaker HCl is more likely to donate the H+ making it a stronger acid.
by almaochoa2D
Sun Dec 09, 2018 7:50 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: H-atom
Replies: 1
Views: 55

Re: H-atom

yes.
by almaochoa2D
Sun Dec 02, 2018 10:11 am
Forum: Naming
Topic: endings in naming
Replies: 3
Views: 35

Re: endings in naming

If a molecule or element is outside of the brackets like Cl3 then it would just be chloride not tricholoro.
by almaochoa2D
Sun Dec 02, 2018 10:07 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Negative pH?
Replies: 5
Views: 42

Re: Negative pH?

A negative pH can be calculated, I'm just not sure why. But it is possible.
by almaochoa2D
Sun Dec 02, 2018 10:03 am
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR Model
Replies: 5
Views: 48

Re: VSEPR Model

When he says use the VSPER Model his is saying to refer to it when answering the question. So you should take in consideration the formula, shape (lone pairs), and bond angles.
by almaochoa2D
Mon Nov 26, 2018 12:00 am
Forum: Sigma & Pi Bonds
Topic: Hybridization and Electron Configurations
Replies: 3
Views: 44

Re: Hybridization and Electron Configurations

I don't think so.
by almaochoa2D
Sun Nov 25, 2018 11:59 pm
Forum: Bond Lengths & Energies
Topic: How to Measure Bond Lengths
Replies: 4
Views: 43

Re: How to Measure Bond Lengths

You do need to know that single bonds are the longest, then it's doubles bonds and triple bands are the shortest out of the three.
by almaochoa2D
Sun Nov 25, 2018 11:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming Shapes
Replies: 5
Views: 39

Re: Naming Shapes

I've just memorized the shapes it is the quickest way to name molecules which is really important for the test since you don't want to run out of time.
by almaochoa2D
Sun Nov 18, 2018 8:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 4
Views: 63

Re: Molecular Shape

the molecular shape helps more because it shows the actual arrangement of the atoms where as the geometry just says how many bonds or regions of bonds around the central atom. The geometry doesn't include lone pairs.
by almaochoa2D
Thu Nov 15, 2018 3:45 pm
Forum: Lewis Structures
Topic: Maximum amount of bonds
Replies: 5
Views: 72

Re: Maximum amount of bonds

Usually the central atom doesn't have a high formal charge. It depends what the charge is of the full compound. If the compound is neutral then the central atom should have a formal charge of 0 or a formal charge that cancels out the formal charge of the other atoms.
by almaochoa2D
Thu Nov 15, 2018 3:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Coordination Numbers
Replies: 1
Views: 18

Re: Coordination Numbers

We haven't gone over this in lecture as far as I know. Dr. Lavelle will most likely answer you question in the following lectures.
by almaochoa2D
Thu Nov 15, 2018 3:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Planar vs Pyramidal
Replies: 3
Views: 34

Re: Planar vs Pyramidal

If the central atom has three bonds and no lone pairs then it will be trigonal planar it doesn't matter if the elements are different.
by almaochoa2D
Sun Nov 11, 2018 12:40 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm [ENDORSED]
Replies: 14
Views: 308

Re: Midterm [ENDORSED]

He doesn't post grades on CCLE just on my UCLA, but he hasn't updated grades as far as I know.
by almaochoa2D
Sun Nov 11, 2018 12:38 pm
Forum: Bond Lengths & Energies
Topic: VSEPR Model for Water
Replies: 3
Views: 50

Re: VSEPR Model for Water

Because CO2 has double bonds and H2O doesn't.
by almaochoa2D
Sat Nov 10, 2018 10:22 pm
Forum: Ionic & Covalent Bonds
Topic: delta positive delta negative
Replies: 15
Views: 258

delta positive delta negative

How do you know which end of a molecule is delta positive or delta negative?
by almaochoa2D
Sun Nov 04, 2018 7:55 pm
Forum: Electronegativity
Topic: How much can you round down for empirical formulas?
Replies: 2
Views: 58

Re: How much can you round down for empirical formulas?

My PLF said that for example if you got the value 1.09 you can't assume 1 but anything lower than 1.09 you can assume one. So in general if it is less than .09 away from a whole number you can still round to that whole number.
by almaochoa2D
Sun Nov 04, 2018 7:52 pm
Forum: Octet Exceptions
Topic: Formal charge
Replies: 7
Views: 101

Re: Formal charge

You should always check the formula charge when you're drawing a lewis structure no matter way. This way you can make sure that the lewis structure you drew is the best one.
by almaochoa2D
Sun Nov 04, 2018 7:47 pm
Forum: Resonance Structures
Topic: Tricks for Resonance Structures
Replies: 5
Views: 123

Re: Tricks for Resonance Structures

I'm pretty sure we won't need to know how many resonance structures we need to draw, the problems will tell us how many resonance we need to draw.
by almaochoa2D
Sun Nov 04, 2018 7:43 pm
Forum: Ionic & Covalent Bonds
Topic: Midterm questions
Replies: 5
Views: 64

Re: Midterm questions

We only need to know the things Dr. Lavelle covered up until wednesday's lecture.
by almaochoa2D
Sun Oct 28, 2018 4:03 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: CH 3 problem 5 [ENDORSED]
Replies: 1
Views: 45

CH 3 problem 5 [ENDORSED]

How do I do 5a because I know that Copper can have exceptions. Give the ground-state electron configuration expected for
each of the following ions: Cu^+
by almaochoa2D
Sun Oct 28, 2018 3:52 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 788998

Re: Post All Chemistry Jokes Here

Want to hear a joke about sodium, bromine, and oxygen?
NaBrO
by almaochoa2D
Sun Oct 28, 2018 3:31 pm
Forum: Ionic & Covalent Bonds
Topic: Friday 10/26/18 lecture
Replies: 4
Views: 62

Re: Friday 10/26/18 lecture

ionic and covalent bonds
by almaochoa2D
Sat Oct 20, 2018 11:26 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Test Two
Replies: 2
Views: 34

Test Two

Does anyone know if we're suppose to know about electron configuration for the test? He said we would only need to know the stuff he lecture about up until friday's lecture, but he didn't really go over electron configuration and that is in outline 2. I don't know if I should study it for the test.
by almaochoa2D
Sat Oct 20, 2018 11:21 am
Forum: Einstein Equation
Topic: wave vs particle behavior equations
Replies: 2
Views: 78

Re: wave vs particle behavior equations

Also the DeBroglie Equations is for objects with mass.
by almaochoa2D
Sat Oct 20, 2018 11:18 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy Equation as an inequality
Replies: 1
Views: 19

Re: Heisenberg Indeterminacy Equation as an inequality

The symbol doesn't need to be there because you are just finding the missing value. The symbol is just there for the purpose of finding the missing value because we are uncertain of what exactly the number is that's why there can't be a = symbol.
by almaochoa2D
Sat Oct 20, 2018 11:13 am
Forum: DeBroglie Equation
Topic: Application to Classical Objects
Replies: 2
Views: 28

Re: Application to Classical Objects

Everything has a wavelength (even we do). The DeBroglie wavelength is for things with mass such as a baseball or a human. The wavelength in the equation for speed of light is the wavelength for photons. These two wavelength are not the same thing. One is for objects with mass while the other one is ...
by almaochoa2D
Sat Oct 13, 2018 7:14 pm
Forum: Photoelectric Effect
Topic: Problem 33 Chapter 1
Replies: 1
Views: 19

Problem 33 Chapter 1

How do you know which equations to use for number 33? I started of my using E=hv and got a very small number so I decided to look in the solutions manual and it showed that I should be using the De Broglie equation. When do you know you should use that equation?
by almaochoa2D
Sat Oct 13, 2018 7:10 pm
Forum: Photoelectric Effect
Topic: 1B.9: Trouble with exponents and units
Replies: 3
Views: 58

Re: 1B.9: Trouble with exponents and units

It could most likely be that you're plugging in things wrong into your calculator or you aren't using parenthesis. Because I multiplied 2 by 32 to cancel out the seconds and got 64 J. You the use the E= hc/wavelength equation and plug in what is given. You should get 4.7x10^-19 J photons^-1. After t...
by almaochoa2D
Sat Oct 13, 2018 6:56 pm
Forum: Properties of Light
Topic: Homework Question 1A.3
Replies: 4
Views: 54

Re: Homework Question 1A.3

The answer is actually c. The extent of change is referring to the slope of the wave so when the frequency decreases the wave gets wider which means that the extent of change is decreases.
by almaochoa2D
Sat Oct 06, 2018 10:45 am
Forum: Balancing Chemical Reactions
Topic: H3, coefficients
Replies: 7
Views: 141

Re: H3, coefficients

It depends what kind of formula it was looking for. If it's molecular you shouldn't simplify, but if it's empirical then you should simplify.
by almaochoa2D
Sat Oct 06, 2018 10:37 am
Forum: General Science Questions
Topic: Rounding up with Sig Figs
Replies: 3
Views: 113

Re: Rounding up with Sig Figs

Rounding up would make the most sense. Rounding down would change the final answer from what it really is.
by almaochoa2D
Sat Oct 06, 2018 10:30 am
Forum: Student Social/Study Group
Topic: HW Schedule?
Replies: 7
Views: 200

Re: HW Schedule?

Does anyone know if homework for outline 2 is due on the day we have the test about the high school review?

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