Search found 32 matches

by Mariah Guerrero 1J
Thu Jun 14, 2018 1:59 am
Forum: Administrative Questions and Class Announcements
Topic: Final Exam [ENDORSED]
Replies: 5
Views: 241

Re: Final Exam [ENDORSED]

Everything is fair game! Good luck everybody!
by Mariah Guerrero 1J
Mon Jun 11, 2018 11:06 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7337
Views: 789159

Re: Post All Chemistry Jokes Here

"The name's bond. Sigma bond."
-007
by Mariah Guerrero 1J
Mon Jun 11, 2018 11:02 pm
Forum: Conjugate Acids & Bases
Topic: Conjugate Acids/Bases
Replies: 8
Views: 300

Re: Conjugate Acids/Bases

Did we cover this in class?
by Mariah Guerrero 1J
Sun Jun 03, 2018 11:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR shape and bond angles
Replies: 5
Views: 131

Re: VSEPR shape and bond angles

Do we have to know the specific bond angles for certain molecular shapes. For example, would it be acceptable to say (on a test) that sulfite ion, SO3 2-, have bond angles less than 109.5? Are approximations ok to state?
by Mariah Guerrero 1J
Sun Jun 03, 2018 11:51 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 4 ligands shape?
Replies: 6
Views: 125

Re: 4 ligands shape?

Square planar has four ligands and two lone pairs. A difference between the two is that the bond angles of the square planar shape are smaller than 109.5 because the atoms are pulled closer together by the repulsion of the lone pairs.
by Mariah Guerrero 1J
Sun Jun 03, 2018 11:46 pm
Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
Topic: When to use the Henderson-Hasselbalch Equation
Replies: 4
Views: 848

Re: When to use the Henderson-Hasselbalch Equation

Will we have to know this equation for the final? We haven't learned about it in lecture yet, right?
by Mariah Guerrero 1J
Thu May 24, 2018 8:38 pm
Forum: Ionic & Covalent Bonds
Topic: ionic and covalent character
Replies: 7
Views: 157

Re: ionic and covalent character

So when determining if a molecule is ionic or covalent, it is not always/only dependent on the electronegativity difference? For example, MgI2 has a electronegativity difference of 1.3 (which is smaller than 1.67, the rule to be a covalent bond). However, MgI2 is an ionic bond right?
by Mariah Guerrero 1J
Thu May 24, 2018 8:29 pm
Forum: Electronegativity
Topic: Question for Exams [ENDORSED]
Replies: 5
Views: 228

Re: Question for Exams [ENDORSED]

So for electronegativity, we should be able to recall that it increases as you go across the periodic table and decreases as you go down the periodic table. The greater the difference in electronegativity, then greater ionic character the bond has.
by Mariah Guerrero 1J
Mon May 21, 2018 8:02 pm
Forum: Electronegativity
Topic: Trends? [ENDORSED]
Replies: 10
Views: 465

Re: Trends? [ENDORSED]

Is there a trend involved in the second ionization energy?
by Mariah Guerrero 1J
Thu May 17, 2018 9:48 pm
Forum: Lewis Structures
Topic: Finding a Lewis Structure with the Lowest Energy
Replies: 5
Views: 120

Re: Finding a Lewis Structure with the Lowest Energy

Just to clarify, lowest energy means that the molecule has a formal charge of 0 (or close to 0), right?
by Mariah Guerrero 1J
Thu May 17, 2018 9:46 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge
Replies: 3
Views: 161

Re: Formal Charge

Yes! A - means that the molecule is an anion, meaning you ADD an electron. A + means the molecule is a cation, meaning you REMOVE an electron.
by Mariah Guerrero 1J
Thu May 17, 2018 9:40 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formula Provided
Replies: 6
Views: 184

Re: Formula Provided

Formal charge can be used to determine if a structure is stable. In drawing lewis structures for tests, the correct answer would be a lewis structure of a molecule with the formal charge of 0 (or close to zero).
by Mariah Guerrero 1J
Thu May 17, 2018 9:28 pm
Forum: Student Social/Study Group
Topic: Final Study Group
Replies: 1
Views: 156

Re: Final Study Group

I would like to be part of the study group if one is organized!
My email is mariah.guerrero99@gmail.com
by Mariah Guerrero 1J
Mon May 14, 2018 12:32 am
Forum: Photoelectric Effect
Topic: Incoming Light [ENDORSED]
Replies: 4
Views: 224

Re: Incoming Light [ENDORSED]

I refreshed the page and the answer UV rays is still marked as incorrect.
by Mariah Guerrero 1J
Mon May 14, 2018 12:30 am
Forum: Lewis Structures
Topic: Formal Energy / Formal Charge [ENDORSED]
Replies: 2
Views: 92

Re: Formal Energy / Formal Charge [ENDORSED]

From my understanding, yes these terms are interchangeable. A charge determines the energy of an atom. Formal charge indicates a gain or loss of electrons while forming covalent bonds; thus, the charge determines energy gain or loss.
by Mariah Guerrero 1J
Sun May 13, 2018 5:07 pm
Forum: Resonance Structures
Topic: Resonance Structures and Formal charges
Replies: 7
Views: 203

Re: Resonance Structures and Formal charges

So for our upcoming tests, the only acceptable lewis structures are those with a formal charge of 0?
by Mariah Guerrero 1J
Sun May 13, 2018 4:31 pm
Forum: Trends in The Periodic Table
Topic: electron affinity [ENDORSED]
Replies: 15
Views: 374

Re: electron affinity [ENDORSED]

Can someone explain the difference between electron affinity and electron negativity again? I understand that both properties have the same periodic trend. Is there an easier way that I can remember the difference?
by Mariah Guerrero 1J
Sun May 13, 2018 4:28 pm
Forum: Ionic & Covalent Bonds
Topic: cation vs anion
Replies: 14
Views: 320

Re: cation vs anion

Are there any trends that occur on the periodic table with cations and anions?
by Mariah Guerrero 1J
Mon May 07, 2018 12:14 am
Forum: Trends in The Periodic Table
Topic: Ground state and excited electrons [ENDORSED]
Replies: 1
Views: 73

Re: Ground state and excited electrons [ENDORSED]

In the simplest terms, ground state refers to an electron in its lowest energy and excited electrons refers to an electron that absorbs energy.
Here's a great video that goes into more detail of the difference! https://www.youtube.com/watch?v=62ll5Tt_3zY
Hope this helps!
by Mariah Guerrero 1J
Mon May 07, 2018 12:09 am
Forum: Photoelectric Effect
Topic: Incoming Light [ENDORSED]
Replies: 4
Views: 224

Incoming Light [ENDORSED]

Hello! I am working on n the post-module for the audio-visual focus topics and this question came up: In photoelectric experiments, typically what part of the electromagnetic spectrum is the incoming light? A. Ultraviolet B. Infrared C. Visible light D. Gamma rays E. None of the above I assumed the ...
by Mariah Guerrero 1J
Mon Apr 30, 2018 12:21 am
Forum: DeBroglie Equation
Topic: Diffraction patterns
Replies: 1
Views: 120

Diffraction patterns

Electrons have diffraction patterns that result from constructive or destructive interference. How does this relate to De Broglie's equation?
by Mariah Guerrero 1J
Mon Apr 30, 2018 12:11 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: test
Replies: 3
Views: 119

Re: test

You can use Rydberg's Equation to solve for the energy levels (n). E= -hR/n^2
If the energy is given in the problem, you would simply have to rearrange the equation in terms of n as it is the only unknown in this case.
by Mariah Guerrero 1J
Mon Apr 30, 2018 12:07 am
Forum: *Shrodinger Equation
Topic: Energy equation
Replies: 1
Views: 134

Re: Energy equation

If energies (E photon and work function) are given in the problem or you can solve for them, then you do not need to use the KE equation. Subtract the work function (also called the threshold energy or ionization energy) from E photon to find the KE. However, if only KE is asked with no other inform...
by Mariah Guerrero 1J
Mon Apr 23, 2018 1:35 pm
Forum: General Science Questions
Topic: Test #2 [ENDORSED]
Replies: 6
Views: 390

Re: Test #2 [ENDORSED]

I think the problems listed from chapter one will not all be on the test; some of these problems are similar to one another. The most important thing for us to do with these problems is to understand the concepts and be able to apply those concepts any which way that is asked.
by Mariah Guerrero 1J
Fri Apr 20, 2018 12:21 am
Forum: General Science Questions
Topic: Test #2 [ENDORSED]
Replies: 6
Views: 390

Test #2 [ENDORSED]

Hello all!
I cannot seem to find the post Dr. Lavelle created that states the specific chapter problems we should focus on for test 2. (He showed us the post at the beginning of class on Wednesday.) Can someone help me locate the info?
by Mariah Guerrero 1J
Fri Apr 20, 2018 12:13 am
Forum: Student Social/Study Group
Topic: Study Group
Replies: 8
Views: 330

Re: Study Group

I would be interested in joining a study group as well! Let me know if one is created please! My email is mariah.guerrero99@gmail.com!
by Mariah Guerrero 1J
Sun Apr 15, 2018 8:03 pm
Forum: Properties of Light
Topic: HW 1.5 [ENDORSED]
Replies: 2
Views: 97

HW 1.5 [ENDORSED]

Question 1.5 states to arrange the following types of photons of electromagnetic radiation in order of increasing energy y rays, visible light, ultraviolet radiation, microwaves, x rays. I understand the order of increasing energy is y ray, x ray, ultraviolet, visible, infrared, microwave and radio....
by Mariah Guerrero 1J
Sun Apr 15, 2018 7:16 pm
Forum: Balancing Chemical Reactions
Topic: Writing Products
Replies: 2
Views: 119

Re: Writing Products

Combustion refers to the burning of air, with a reaction with molecular oxygen. Therefore, to start off by writing the correct chemical equation you would write KCl + O2= . Writing the reactants as one (letter B) creates a new, separate molecule that will produce a different outcome. KCl reacts with...
by Mariah Guerrero 1J
Sun Apr 15, 2018 7:09 pm
Forum: SI Units, Unit Conversions
Topic: Extensive vs. Intensive Properties?
Replies: 3
Views: 106

Re: Extensive vs. Intensive Properties?

An extensive property is a property that does depend on the size or the "extent" of the sample. In this case, mass and density are an extensive properties. An intensive property is independent of the size of the sample. Volume and temperature are examples of extensive properties.
by Mariah Guerrero 1J
Sun Apr 15, 2018 7:02 pm
Forum: Limiting Reactant Calculations
Topic: Reagent vs. Reactant [ENDORSED]
Replies: 6
Views: 308

Reagent vs. Reactant [ENDORSED]

What is the difference between reagent and reactant? Or are these terms interchangeable?
by Mariah Guerrero 1J
Thu Apr 12, 2018 11:46 pm
Forum: Limiting Reactant Calculations
Topic: Two limiting reactants?
Replies: 10
Views: 546

Two limiting reactants?

Can a reaction have two limiting reactants?
by Mariah Guerrero 1J
Thu Apr 12, 2018 10:58 pm
Forum: Limiting Reactant Calculations
Topic: Q.22 on Audio-Visual Focus-Topic [ENDORSED]
Replies: 2
Views: 79

Q.22 on Audio-Visual Focus-Topic [ENDORSED]

I am reviewing the post-assessment for the audio-visual focus-topic for limiting reactants, and I am stuck on this problem. According to the following equation, 0.750 g of C6H9Cl3 is mixed with 1.000 kg of AgNO3 in a flask of water. A white solid, AgCl, completely precipitates out. What is the mass ...

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