Search found 57 matches

by veneziaramirez 3I
Sat Mar 17, 2018 5:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Chemical Compounds
Replies: 1
Views: 201

Chemical Compounds

Will we be tested on naming chemical compounds? For example, name CH3CH(CH3)CH(CH2CH3)C(CH3)3?
by veneziaramirez 3I
Thu Mar 15, 2018 10:19 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.57
Replies: 1
Views: 76

8.57

How do we know which balanced equations to use for the reaction given? Where do the equations from the solutions manual come from?
by veneziaramirez 3I
Wed Mar 14, 2018 9:49 pm
Forum: Balancing Redox Reactions
Topic: Lecture 3/14
Replies: 3
Views: 182

Lecture 3/14

For the first problem that we reviewed today, how do we know which reaction to choose to be oxidizing and reducing? Do we choose our oxidizing to be the reaction with the largest cell voltage?
by veneziaramirez 3I
Thu Mar 08, 2018 8:21 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: 15.17
Replies: 6
Views: 317

Re: 15.17

How can we tell [C] is zero order?
by veneziaramirez 3I
Tue Mar 06, 2018 10:08 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Increasing Concentration of Reactants
Replies: 5
Views: 272

Increasing Concentration of Reactants

Does increasing the concentration of the reactants increase the rate of the reaction?
by veneziaramirez 3I
Tue Mar 06, 2018 3:05 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Midterm Question 5 (Step 2)
Replies: 2
Views: 201

Midterm Question 5 (Step 2)

Why is the internal energy positive if when we calculated it in step 1 it was negative?
by veneziaramirez 3I
Sun Mar 04, 2018 10:40 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 890695

Re: Post All Chemistry Jokes Here

I'm having such a hard time staying up late to do homework.
It's sodium hard.
by veneziaramirez 3I
Sun Mar 04, 2018 10:36 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 890695

Re: Post All Chemistry Jokes Here

Would you like to hear a joke about sodium?
Na
by veneziaramirez 3I
Sun Mar 04, 2018 10:33 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Affects rate of chemical reactions
Replies: 2
Views: 126

Affects rate of chemical reactions

What affects the rate of chemical reactions?
by veneziaramirez 3I
Thu Feb 22, 2018 8:41 am
Forum: Balancing Redox Reactions
Topic: 14.1 [ENDORSED]
Replies: 1
Views: 80

14.1 [ENDORSED]

Why is H+ included in part B? Its oxidation number stays the same?
by veneziaramirez 3I
Tue Feb 20, 2018 8:40 pm
Forum: Balancing Redox Reactions
Topic: Balancing number of electrons
Replies: 10
Views: 344

Balancing number of electrons

To balance the number of electrons between the two half-reactions, we multiply each reaction by the least common multiple?
by veneziaramirez 3I
Tue Feb 20, 2018 6:46 pm
Forum: Balancing Redox Reactions
Topic: Exceptions in Halogens
Replies: 1
Views: 67

Exceptions in Halogens

Which halogens do not have a (-1) charge?
by veneziaramirez 3I
Sun Feb 18, 2018 8:14 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Work when pressure is constant
Replies: 6
Views: 382

Work when pressure is constant

When pressure is constant, since w=-P(ext)change in v , it also can be w= -nRT?
by veneziaramirez 3I
Sun Feb 18, 2018 8:09 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Order in Cell Diagrams
Replies: 4
Views: 132

Order in Cell Diagrams

Is there a specific order of the phases or does it not matter?
by veneziaramirez 3I
Tue Feb 13, 2018 3:06 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Homework this week?
Replies: 1
Views: 92

Homework this week?

Is the homework for this week on Chapter 11? Since there are few questions, could we repeat the ones we did for last week?
by veneziaramirez 3I
Sun Feb 11, 2018 8:27 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: 11.83
Replies: 4
Views: 178

11.83

Why do we need to find delta S?
by veneziaramirez 3I
Sun Feb 11, 2018 11:03 am
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Non-spontaneous
Replies: 4
Views: 135

Non-spontaneous

What does it mean for a reaction to be non-spontaneous yet its reverse reaction to be spontaneous? Why is its reverse reaction spontaneous?
by veneziaramirez 3I
Thu Feb 08, 2018 5:04 am
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Extensive Property?
Replies: 3
Views: 141

Extensive Property?

What does it mean for something to be an extensive or intensive property?
by veneziaramirez 3I
Wed Feb 07, 2018 9:24 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bonds Broken - Bonds Formed?
Replies: 2
Views: 149

Bonds Broken - Bonds Formed?

Are the bonds being added since bonds forming releases energy so it will be negative? Or is it broken- formed so it’s a double negative ?
by veneziaramirez 3I
Tue Feb 06, 2018 8:10 pm
Forum: Phase Changes & Related Calculations
Topic: 8.19
Replies: 3
Views: 166

8.19

Does anyone know where the 0.38 J/Cg come from?
by veneziaramirez 3I
Tue Feb 06, 2018 1:29 am
Forum: Phase Changes & Related Calculations
Topic: Units for Internal Energy
Replies: 5
Views: 168

Units for Internal Energy

Does it matter which units to use for internal energy for our final answer. Is it kJ or J?
by veneziaramirez 3I
Sun Feb 04, 2018 11:12 pm
Forum: Administrative Questions and Class Announcements
Topic: Midterm
Replies: 5
Views: 280

Re: Midterm

I believe it is Chapter 8, 9 and 11? I am not too sure.
by veneziaramirez 3I
Sun Feb 04, 2018 11:11 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Heating Capacity
Replies: 3
Views: 130

Re: Heating Capacity

Does it matter which equation we use to find heat capacity? Will the formula for specific heat capacity and molar heat capacity give the same thing?
by veneziaramirez 3I
Sun Feb 04, 2018 11:08 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Calculations on Internal Energy
Replies: 4
Views: 208

Calculations on Internal Energy

Will calculations on internal energy and work be on the midterm?
by veneziaramirez 3I
Thu Jan 25, 2018 1:17 am
Forum: Phase Changes & Related Calculations
Topic: 8.17
Replies: 2
Views: 146

8.17

Can anyone explain why a) is work done by the system? Wouldn’t it be on the system since it is absorbing heat? Hence solid to liquid?
by veneziaramirez 3I
Tue Jan 23, 2018 2:34 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: How to use Hess’s Law
Replies: 1
Views: 68

How to use Hess’s Law

In toolbox 8.1, it says to cancel species that appear on both sides of the equation and to add substances on the opposite side of the arrow. However in the example 8.16 provides on pg. 292, it does the opposite. The O2’s are added yet are on the same side of the arrow and the CO’s are subtracted yet...
by veneziaramirez 3I
Tue Jan 23, 2018 2:10 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Material in Book but not in Lectures
Replies: 5
Views: 153

Re: Material in Book but not in Lectures

Should we know how to draw the heating curves?
by veneziaramirez 3I
Mon Jan 22, 2018 9:40 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: standard enthalpy of formation
Replies: 3
Views: 114

Re: standard enthalpy of formation

Standard reaction enthalpy is when the reactants and products in a reaction are in their standard state at 1 atm. Standard enthalpy of formation is the standard reaction enthalpy for the formation of one mole of a substance from its element in their most stable form.
by veneziaramirez 3I
Sat Jan 20, 2018 3:22 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Finding change in enthalpy when given bond enthalpies
Replies: 3
Views: 122

Finding change in enthalpy when given bond enthalpies

Do we subtract the reactants from the products or do we add all the bond enthalpies together ?
by veneziaramirez 3I
Sat Jan 20, 2018 1:43 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Calculations on Test 3
Replies: 3
Views: 145

Calculations on Test 3

So if the calculations will not be on work and internal energy, what will the calculations be on?
by veneziaramirez 3I
Sat Jan 20, 2018 12:57 pm
Forum: Phase Changes & Related Calculations
Topic: Why does steam cause severe burns?
Replies: 4
Views: 145

Why does steam cause severe burns?

I know he covered this in class, but I still quite don’t understand. Could someone explain please?
by veneziaramirez 3I
Sun Jan 14, 2018 11:47 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.7
Replies: 2
Views: 145

8.7

Why is 982 delta U? Wouldn’t it be 982J- 492J? Aren’t work and delta U the same thing as according to 8.3 c?
by veneziaramirez 3I
Sun Jan 14, 2018 9:51 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: 8.5
Replies: 2
Views: 125

8.5

So whenever we are trying to find the change in internal energy, we add the two energy terms?
by veneziaramirez 3I
Sun Jan 14, 2018 8:51 pm
Forum: Calculating Work of Expansion
Topic: 8.3 Solution Question
Replies: 1
Views: 113

8.3 Solution Question

In the solutions manual, it says we use change of volume= -(pi)(r^2)(d). Why would we use the radius of the initial diameter and for d we use the second diameter?
by veneziaramirez 3I
Fri Dec 08, 2017 7:14 pm
Forum: Conjugate Acids & Bases
Topic: Stabilizing Conjugate Bases
Replies: 1
Views: 115

Stabilizing Conjugate Bases

What can stabilize a base? How can we tell if it’s stabilized?
by veneziaramirez 3I
Wed Dec 06, 2017 4:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Will we be given Table 11.2?
Replies: 2
Views: 131

Will we be given Table 11.2?

Will we be given table 11.2 or should we memorize some values?
by veneziaramirez 3I
Wed Dec 06, 2017 3:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 11.25 [ENDORSED]
Replies: 2
Views: 122

11.25 [ENDORSED]

Why is the answer Kc = [HI]^2/ [H2][I2] instead of P[HI]^2/P[H2]P[I2]?
by veneziaramirez 3I
Thu Nov 30, 2017 3:34 am
Forum: Naming
Topic: Homework 17.29(B)
Replies: 1
Views: 121

Re: Homework 17.29(B)

We determine the oxidation number of the metal with the equation (# of metals)(oxidation # of metal) + (# of ligands)(charge of each ligand) = charge of ion so for 17.29 (B) # of metals = 1 oxidation # of metal = x (what we are trying to find) # of ligands = 6 charge of ligand = 0 (which is given by...
by veneziaramirez 3I
Thu Nov 30, 2017 3:24 am
Forum: Naming
Topic: Suffixes
Replies: 4
Views: 288

Suffixes

What suffixes should we memorize? I understand if one of the ligands has a negative charge of one then -ate is added to the metal, but if it has a negative charge of 2, no suffix is added as demonstrated in 17.29 d)?
by veneziaramirez 3I
Thu Nov 30, 2017 1:26 am
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Changes in K
Replies: 4
Views: 189

Changes in K

So the only thing that changes equilibrium is temperature? If a reactant is removed, the equilibrium would not change? Removing it would only change Q?
by veneziaramirez 3I
Sun Nov 26, 2017 11:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Difference between molecular and electron geometry?
Replies: 1
Views: 8099

Difference between molecular and electron geometry?

What is the difference between electron and molecular geometry?
by veneziaramirez 3I
Sun Nov 19, 2017 11:50 am
Forum: Determining Molecular Shape (VSEPR)
Topic: All bond angles
Replies: 3
Views: 158

All bond angles

Do we have to memorize all bond angles within each shape?
by veneziaramirez 3I
Sun Nov 19, 2017 11:46 am
Forum: Lewis Structures
Topic: Best way to start Lewis Structures
Replies: 12
Views: 471

Best way to start Lewis Structures

What is the best way to start a Lewis structure? Draw all the electrons on each atom, then draw the bonds or draw the bonds then assign electrons?
by veneziaramirez 3I
Wed Nov 08, 2017 12:35 am
Forum: Trends in The Periodic Table
Topic: Radius
Replies: 6
Views: 283

Radius

What is the difference between an atomic and ionic radius?
by veneziaramirez 3I
Wed Nov 08, 2017 12:27 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 3.5 b) [ENDORSED]
Replies: 5
Views: 291

3.5 b) [ENDORSED]

I still don't quite understand how we write electron configurations. The answer is [Xe] 4f^14 5d^10 6s^2 , and I understand it is in numerical order, but when we are solving it, do we solve it as [Xe] 6s^2 4f^14 5d^10 then rearrange it?
by veneziaramirez 3I
Thu Nov 02, 2017 5:36 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Reasonable Model
Replies: 2
Views: 174

Reasonable Model

If the velocity in the Heisenberg's equation is slower than the speed of light, then it is a reasonable model? And if it is more than the speed of light, then it is an unrealistic model?
by veneziaramirez 3I
Wed Nov 01, 2017 9:33 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Order of Orbitals
Replies: 10
Views: 471

Order of Orbitals

Does the order of orbitals matter? For instance is it okay if we either write 4s2 3d10 or 3d10 4s2?
by veneziaramirez 3I
Sun Oct 29, 2017 11:26 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Copper and Chromium [ENDORSED]
Replies: 4
Views: 492

Copper and Chromium [ENDORSED]

What is the exception with Copper and Chromium?
by veneziaramirez 3I
Wed Oct 25, 2017 11:19 pm
Forum: Properties of Light
Topic: Homework?
Replies: 2
Views: 195

Homework?

Is this week's homework based on Chapter 2 or the rest of Chapter 1?
by veneziaramirez 3I
Mon Oct 16, 2017 10:46 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Question about 1.17 [ENDORSED]
Replies: 3
Views: 297

Re: Question about 1.17 [ENDORSED]

Even though it is He^+ we would still make Z 2? So if it is a one-electron ion, we would use how many the element originally has?
by veneziaramirez 3I
Mon Oct 16, 2017 9:47 pm
Forum: Properties of Light
Topic: Where is the page of constants?
Replies: 1
Views: 105

Where is the page of constants?

Does anyone know where in Dr. Lavelle's website the page of constants is? I can't seem to find it.
by veneziaramirez 3I
Sun Oct 15, 2017 2:50 pm
Forum: DeBroglie Equation
Topic: 1.37 [ENDORSED]
Replies: 5
Views: 317

Re: 1.37 [ENDORSED]

I think the mass would be given since in Example 1.6, Self-Test 1.6A, the question mentions that the mass of an electron can be found inside the back cover of the book. There, you can also find the mass of a proton.
by veneziaramirez 3I
Sat Oct 14, 2017 1:41 pm
Forum: Properties of Light
Topic: Electromagnetic Spectrum [ENDORSED]
Replies: 2
Views: 178

Electromagnetic Spectrum [ENDORSED]

Will the electromagnetic spectrum be given on the test? Or would we have to memorize the group the wavelength belongs to?
by veneziaramirez 3I
Thu Oct 05, 2017 12:33 am
Forum: Balancing Chemical Reactions
Topic: H1 // Book Problem [ENDORSED]
Replies: 7
Views: 389

Re: H1 // Book Problem [ENDORSED]

By adding an O to the products, it will indicate that free range Oxygen atoms are ALSO being produced, which is not the case. So adding an O will indicate that a different reaction is occurring.
by veneziaramirez 3I
Thu Oct 05, 2017 12:26 am
Forum: Limiting Reactant Calculations
Topic: Percent Yield [ENDORSED]
Replies: 5
Views: 491

Percent Yield [ENDORSED]

Why is having a high percentage yield good? Around what percentage is considered good?

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