Search found 29 matches

by Sonia Perez 1G
Fri Mar 11, 2016 7:01 pm
Forum: *Cycloalkanes
Topic: Cycloalkanes
Replies: 1
Views: 378

Cycloalkanes

Does cis and trans only apply to cycloalkanes that have substituents and or double bonds?
by Sonia Perez 1G
Sat Mar 05, 2016 7:19 pm
Forum: *Ketones
Topic: Naming Keytones
Replies: 1
Views: 739

Naming Keytones

Why is there a 2 before the -yl? (page 62 of the organic workbook)

2-methyl-5-(prop-1-en-2-yl)cyclohex-2-enone

Thank you.
by Sonia Perez 1G
Tue Mar 01, 2016 7:04 pm
Forum: *Cycloalkanes
Topic: Naming cycloalkanes
Replies: 1
Views: 296

Naming cycloalkanes

When naming cycloalkanes does using -pent or -penta matter? For the following example, would both answers be considered correct?

5-methylcyclopenta-1,3-diene
5-methylcyclopent-1,3-diene
by Sonia Perez 1G
Sat Feb 27, 2016 7:22 pm
Forum: *Cycloalkenes
Topic: IUPAC name
Replies: 1
Views: 351

IUPAC name

For c8h16, isopropyl-cyclopentane (page 99 of the course reader) what would be its IUPAC name?
by Sonia Perez 1G
Sat Feb 27, 2016 4:10 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Activated Complex
Replies: 3
Views: 454

Re: Activated Complex

This example is from the homework problem chapter 15 #85 "The following rate laws were each derived from an elementary reaction. In each case, write the chemical equation for the reaction, determine its molecularity, and draw a proposed structure for the activated complex:" a) Rate= k[ch3c...
by Sonia Perez 1G
Fri Feb 26, 2016 6:31 pm
Forum: *Organic Reaction Mechanisms in General
Topic: Activated Complex
Replies: 3
Views: 454

Activated Complex

For the reaction ch3cho --> ch3 + cho rate= k[ch3cho]

how would you draw a proposed structure for the activated complex?
by Sonia Perez 1G
Mon Feb 15, 2016 10:17 pm
Forum: Second Order Reactions
Topic: homework problem #35
Replies: 4
Views: 694

homework problem #35

The half life for the second-order reaction of a substance A is 50.5 s when [A]0 = 84 M. Calculate the time needed for the concentration of A to decrease to (a) one-sixteenth, (b) one-fourth, (c) one-fifth of its original value. For part a, if we are given the half life why are we not able to multip...
by Sonia Perez 1G
Fri Feb 12, 2016 9:20 pm
Forum: Kinetics vs. Thermodynamics Controlling a Reaction
Topic: Kinetics
Replies: 2
Views: 377

Kinetics

How would you determine the molecularity of a reaction?
by Sonia Perez 1G
Sun Feb 07, 2016 2:09 pm
Forum: Calculating Work of Expansion
Topic: Work Under a Curve
Replies: 1
Views: 283

Work Under a Curve

In page 45 of the course reader, the amount of work of represented by a diagram. I know the amount of work is the area under the curve, I just don't understand how they got w= -2.22 kj for path A.
Thank you.
by Sonia Perez 1G
Fri Feb 05, 2016 2:08 pm
Forum: Galvanic/Voltaic Cells, Calculating Standard Cell Potentials, Cell Diagrams
Topic: Standard Cell Potential
Replies: 1
Views: 295

Standard Cell Potential

What determines if a reaction is spontaneous E or E at standard conditions?
by Sonia Perez 1G
Sun Jan 31, 2016 8:00 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox Reactions
Replies: 2
Views: 376

Balancing Redox Reactions

When balancing the following redox reaction, what would be the oxidation state for o3?

o3 + Br- --> O2 + BrO3-
by Sonia Perez 1G
Fri Jan 29, 2016 7:31 pm
Forum: Balancing Redox Reactions
Topic: determining half reactions
Replies: 1
Views: 318

Re: determining half reactions

Here are some steps to guide you in balancing redox reactions in acidic solution: -Identify the two half reactions -Balance the reaction for all elements except hydrogen and oxygen -Add water molecules (H2O) to balance the number of oxygens -Add protons/hydrogen ions (H+) to balance the number of hy...
by Sonia Perez 1G
Sat Jan 23, 2016 4:54 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Reaction Enthalpies
Replies: 1
Views: 244

Reaction Enthalpies

I am a bit confused of when the enthalpy of an element in its natural state is zero. If we are looking for the standard enthalpy of formation, would the enthalpy of 02 be zero? What if we are given the bond enthalpies, would O2 also have a bond enthalpy of zero?
by Sonia Perez 1G
Mon Jan 18, 2016 11:29 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Homework 8.49
Replies: 4
Views: 460

Homework 8.49

The homework problem reads: Oxygen difluoride is a colorless, very poisonous gas that reacts rapidly with water vapor to produce O2, HF, and heat: OF2 + H2O--> O2 + 2HF delta H= -318 kj What is the change in internal energy for the reaction of 1.00 mol OF2? I do not understand why the formula PV=nRT...
by Sonia Perez 1G
Mon Jan 18, 2016 11:20 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Converting to Joules
Replies: 1
Views: 242

Converting to Joules

When converting to J do we use an ideal gas constant or the conversion 1L atm= 101.325 J?
by Sonia Perez 1G
Fri Jan 15, 2016 9:02 pm
Forum: Phase Changes & Related Calculations
Topic: Heating Curves vs. Cooling Curves
Replies: 1
Views: 3683

Heating Curves vs. Cooling Curves

How does a cooling curve differ from a heating curve?
by Sonia Perez 1G
Thu Jan 14, 2016 10:09 pm
Forum: Calculating Work of Expansion
Topic: Units for Work
Replies: 2
Views: 507

Re: Units for Work

When solving for work we use the formula
W=P (V final - V initial), after solving the units should be in atm and Liters. By using the conversion factor of 1 atm x liter is equal to 101.325 J, our final answer is in Joules.
by Sonia Perez 1G
Fri Jan 08, 2016 6:32 pm
Forum: Phase Changes & Related Calculations
Topic: Different types of systems
Replies: 3
Views: 495

Re: Different types of systems

Open System: mass and energy can cross boundaries
Closed System: mass cannot cross, but energy can
Isolated System: neither mass nor energy can cross

A plant would be an open system since it can absorb water (mass).
by Sonia Perez 1G
Fri Nov 27, 2015 8:48 pm
Forum: Identifying Acidic & Basic Salts
Topic: Ions as Bases
Replies: 2
Views: 428

Ions as Bases

Sodium Acetate: NaCH3CO2 (s)
CH3CO2-(aq) + H2O(l) --> OH-(aq) + CH3CO2H (aq)

In this reaction why is Na+ not included?
by Sonia Perez 1G
Wed Nov 25, 2015 10:49 am
Forum: Naming
Topic: Video:Naming Coordination Compounds
Replies: 2
Views: 482

Re: Video:Naming Coordination Compounds

This is the .mov version of the video me, Sonia Perez, and Miriam Velez (DIS 3F) worked on.

(For some reason the sound was distorted a bit in this version. The .mp4 version of this video is up too -- with clear sound).
by Sonia Perez 1G
Mon Nov 23, 2015 9:05 pm
Forum: Naming
Topic: naming ligands
Replies: 2
Views: 478

Re: naming ligands

[Co(NH3)5Cl]Cl x 2H2O
by Sonia Perez 1G
Mon Nov 16, 2015 10:20 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentates
Replies: 1
Views: 401

Polydentates

How are you able to tell if this ligand is a polydentate: HN(CH2CH2NH2)2
Would I have to draw the structure or can I know by just looking at the formula?
by Sonia Perez 1G
Tue Nov 10, 2015 6:16 pm
Forum: Naming
Topic: Coordination Compounds
Replies: 2
Views: 393

Coordination Compounds

Hello, when naming [Co(SO4)(NH3)5]+ does the order of the ligands matter?
Can the name be pentaaminne sulfato cobalt(iii) ion or pentaammine cobalt(iii) sulfato ion?
by Sonia Perez 1G
Mon Nov 09, 2015 9:32 pm
Forum: Naming
Topic: Coordination Compounds
Replies: 1
Views: 296

Coordination Compounds

The coordination compound [Pt(H2O)4] [Zn(Ox)2] is referred to as Tetraaquaplatinum(ii) bis(oxalato)zincate(ii),
why is the prefix bis used to describe (Ox)2 instead of di?

Thank you.
by Sonia Perez 1G
Tue Oct 27, 2015 11:27 pm
Forum: Ionic & Covalent Bonds
Topic: Periodic Trends
Replies: 1
Views: 385

Periodic Trends

How do you know what bond is more covalent PCl5 or PF5?
by Sonia Perez 1G
Tue Oct 27, 2015 7:57 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Lewis Dot Structure and Formal Charge
Replies: 3
Views: 591

Lewis Dot Structure and Formal Charge

What is the most stable Lewis Dot Structure for N20? When i calculated the formal charge, the total charge for both structures was zero.

N::N::O (add electrons to form an octet) or

N:::N:O
by Sonia Perez 1G
Thu Oct 22, 2015 10:25 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Electron Configuration
Replies: 1
Views: 661

Electron Configuration

What is the correct electron configuration for Co3+? Thank you.

Co= [Ar]4s2 3d7 or Co3+= [Ar]3d4 4s2
Co2+= [Ar]3d7
Co3+=3d6
by Sonia Perez 1G
Sun Oct 11, 2015 8:47 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 1
Views: 303

Work Function

The work function for chromium metal is 4.37 eV. What wavelength of radiation must be used to eject electrons with a velocity of 1.50 x 10^3km/s?
I'm having trouble figuring out what to do with the "4.37 eV," thank you.
by Sonia Perez 1G
Fri Oct 02, 2015 10:11 pm
Forum: Significant Figures
Topic: Number of sig figs for 1.23
Replies: 1
Views: 355

Re: Number of sig figs for 1.23

The answer should have 6 significant figures.

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