Search found 31 matches

Thu Jun 14, 2018 6:10 pm
Forum: Lewis Structures
Topic: lewis structure
Replies: 10
Views: 527

Re: lewis structure

The least electronegative, an one capable of making the most bond should be in the center.
Thu Jun 14, 2018 6:09 pm
Forum: Ionic & Covalent Bonds
Topic: ionic character
Replies: 11
Views: 1344

Re: ionic character

megangeorge-1F wrote:what is the difference between something being ionic or dipole?

I believe the difference between ionic and dipole is that ionic is a force between an ion and polar molecule, while dipole is between a hydrogen bond that is slightly positive on one molecule and slightly negative on another.
Thu Jun 14, 2018 6:05 pm
Forum: Lewis Structures
Topic: Octet Rule
Replies: 5
Views: 357

Re: Octet Rule

The Lewis structure should have C as the central atom. C should have a double bond with S and single bonds to the 2 Fs.
Thu Jun 14, 2018 5:55 pm
Forum: Hybridization
Topic: How to figure out hybridization
Replies: 5
Views: 815

Re: How to figure out hybridization

You're looking for regions of electron density. When looking at the VSEPR formula for SO2 you see it would be AX2E (3 total) which in turn will equal to sp2
Thu Jun 14, 2018 5:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: hw 4.21d
Replies: 2
Views: 397

Re: hw 4.21d

It is more stable for N in N2H4 to not have double bond. So N will have 3 bonds w H and 1 lone pair. This is trigonal pyramidal which is equal to 107 degrees. C2H4 would be able to have a double bond hence the different answers.
Thu Jun 14, 2018 5:49 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge Exponent
Replies: 5
Views: 539

Re: Formal Charge Exponent

If one of the molecule's components has a negative charge, the entire compound takes on the charge as a whole.
Thu Jun 14, 2018 5:48 pm
Forum: Hybridization
Topic: Hybridization [ENDORSED]
Replies: 3
Views: 303

Re: Hybridization[ENDORSED]

With 2 lone pairs and 4 bonds with F, totals up to 6. So it would be sp3d2 hybridization
Thu Jun 14, 2018 5:47 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 8039
Views: 1411246

Re: Post All Chemistry Jokes Here

Did you know that you can cool yourself to -273.15˚C and still be 0 K?
Thu Jun 14, 2018 5:46 pm
Forum: Properties of Light
Topic: Frequency vs Cycle
Replies: 5
Views: 363

Re: Frequency vs Cycle

Frequency is like multiple cycles over a time. While a cycle is just when a wave completes a whole period
Thu Jun 14, 2018 5:45 pm
Forum: Lewis Acids & Bases
Topic: HI or HCl: stronger acid
Replies: 8
Views: 2455

Re: HI or HCl: stronger acid

HI would be the stronger acid, as iodine's atomic radius is much larger than Cl's. So iodine is more evenly distributed when ionized
Wed Jun 13, 2018 9:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Chapter 4 #21A Angle [ENDORSED]
Replies: 1
Views: 215

Chapter 4 #21A Angle[ENDORSED]

Why are the angles for C2H4 120 degrees instead of 109.5? I thought it was tetrahedral.
Wed Jun 13, 2018 4:26 am
Forum: Lewis Acids & Bases
Topic: Strong Acid
Replies: 8
Views: 571

Re: Strong Acid

A strong acid can completely disassociate in water. As they have hydrogen ions, the higher the hydrogen concentration, the lower the pH is. In a compound it is dependent on the H bond and the negative ion.
Wed Jun 13, 2018 4:23 am
Forum: Naming
Topic: Naming
Replies: 9
Views: 611

Re: Naming

An ion is an particle that has a charge, positive or negative. If there's no charge, it's not an ion. In a compound, it is usually at the end.
Wed Jun 13, 2018 4:22 am
Forum: Naming
Topic: Naming and Polyatomic Ions
Replies: 6
Views: 595

Re: Naming and Polyatomic Ions

I think it is fine to use it interchangeably. It would be safe to memorize the polyatomic ions as we need their charges to find the oxidation number and create our formula. However, I don't think it's too imperative. Hopefully, they're providing it for the most part.
Wed Jun 13, 2018 4:17 am
Forum: Bond Lengths & Energies
Topic: Bond Angles
Replies: 3
Views: 327

Re: Bond Angles

Typically you do not have to be that specific. However, I believe in my section it was said 1 lone pair is more than 109.5 and 2 is less than 109.5 too.
Wed Jun 13, 2018 4:14 am
Forum: Naming
Topic: Oxidation
Replies: 3
Views: 314

Re: Oxidation

For practice, I wrote these on my periodic table while studying, and over time you see the pattern and are able to memorize easier.

Group 1: +1
Group 2: +2
Ag: + Zn: +2
Group 13: +3
Group 14: 0
Group 15: -3
Group 16: -2
Group 17: -1
Wed Jun 13, 2018 4:09 am
Forum: Formal Charge and Oxidation Numbers
Topic: Perchlorate (ClO4)-
Replies: 7
Views: 8048

Re: Perchlorate (ClO4)-

Chlorine is the central atom, and for central atoms you want the formal charge to be 0. The negative charge should be on the others, especially in this instance O is more electronegative than Cl.
Wed Jun 13, 2018 4:06 am
Forum: Hybridization
Topic: S-Character and Bond Angle Relationship
Replies: 3
Views: 1371

Re: S-Character and Bond Angle Relationship

The s-character means the single bond, or sigma in the hybridization. Like sp, half is s-character and the other half is p-character.Or in sp3 its 1/4 s-character and 3/4 p-character. When there are more s-characters in a bond, the bond grows shorter yet stronger. It's all about the atom amount, jus...
Wed Jun 13, 2018 3:59 am
Forum: Determining Molecular Shape (VSEPR)
Topic: ClO2+ Chapter 4 Homework Problem 5
Replies: 1
Views: 232

ClO2+ Chapter 4 Homework Problem 5

Should the shape for ClO3+ really be trigonal bipyramidal? There's two bonding pairs and 1 nonbonding pair, AX2E1. Shouldn't it be bent? I searched for reasoning but it doesn't make sense to me...
Mon Apr 23, 2018 12:01 am
Forum: Properties of Light
Topic: Test 2 Material
Replies: 12
Views: 625

Re: Test 2 Material

The material on Test 2 wil cover Chapter 1 to 1.5 "(wave and photon properties of light; Einstein equation; photoelectric effect; Bohr frequency condition; atomic spectra (electronic transitions); wave and particle properties of electrons, protons, etc.; DeBroglie equation)". This was all ...
Sun Apr 22, 2018 11:58 pm
Forum: Properties of Light
Topic: Amplitude and Intensity
Replies: 6
Views: 329

Re: Amplitude and Intensity

Intensity is the measurable amount of a property, such as brightness. While light is a range of electromagnetic radiation detectable by the human eye. Intensity can be a property of light, and more information can be found in 1.2 of the textbook.
Sun Apr 22, 2018 11:50 pm
Topic: Temperature relates to brightness?
Replies: 2
Views: 508

Re: Temperature relates to brightness?

Those three terms do not mean the same thing. Temperature is a property that tells you the degree of heat in an object. Brightness is a property that tells you the extent of light reflection there is of an object. Intensity is how concentrated/how much of there in temperature of brightness. So it co...
Sun Apr 22, 2018 11:45 pm
Forum: Ideal Gases
Replies: 147
Views: 104668

In my own experience, reading the textbook helps me to clear up any confusions I have. When you already have the foundations from going to lecture down, reading the textbook solidifies any small misconceptions or reaffirms what you know. It's good to read it in order to absolutely make sure you are ...
Sun Apr 22, 2018 11:45 pm
Forum: Ionic & Covalent Bonds
Topic: Types of Bonds
Replies: 10
Views: 600

Re: Types of Bonds

Covalent bond is a bond between two nonmetals, while an ionic bond is a bond between a nonmetal and a metal. You're able to easily discern this by looking at the elements of the equation from the periodic table.
Sun Apr 15, 2018 11:35 pm
Forum: Balancing Chemical Reactions
Topic: Suggestions for Balancing Reactions
Replies: 8
Views: 477

Re: Suggestions for Balancing Reactions

I like to record out the amount for each element on each side, it makes it more clear to me and helps with memory. It is a good way to refer back to proper numbers and assure you're on the right track for calculations.
Sun Apr 15, 2018 10:54 pm
Forum: Limiting Reactant Calculations
Topic: Reagent vs. Reactant [ENDORSED]
Replies: 6
Views: 726

Re: Reagent vs. Reactant[ENDORSED]

There's no difference between reactant or reagent, these these terms are used interchangeably and do not mean anything different.
Sun Apr 15, 2018 10:52 pm
Forum: Ionic & Covalent Bonds
Topic: C2+ C2-
Replies: 4
Views: 1035

Re: C2+ C2-

Since C2- has extra electrons, the negative charge gives it a stronger, stable bond that makes it harder to pull an electron away. In valence electrons, there are 8 VE for C2- and 4 VE for C2+.
Sun Apr 15, 2018 10:50 pm
Forum: SI Units, Unit Conversions
Topic: Sig figures
Replies: 9
Views: 407

Re: Sig figures

The amount of significant figures you need is dependent on the equation you're solving. The number you use is the least number of decimal places for your answer. However, it is not always the case, you need to know the proper mathematical operation rules to determine case by case.
Sun Apr 08, 2018 10:47 pm
Forum: Significant Figures
Topic: Why are sig figs important?
Replies: 13
Views: 4906

Re: Why are sig figs important?

Significant figures are important because it normalizes different data sets throughout calculations, because as you do more calculations the data becomes less precise. Therefore, significant figures allow for more precision.
Sun Apr 08, 2018 10:42 pm
Forum: SI Units, Unit Conversions
Topic: writing out conversions in one long line vs. steps
Replies: 16
Views: 880

Re: writing out conversions in one long line vs. steps

Typically, I prefer to write it out in a long line just so I can see it all in one condensed space. However, it really is up to your own preference, and doesn't matter as long as you personally understand the material.
Fri Apr 06, 2018 2:13 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Dimensional Analysis Help [ENDORSED]
Replies: 6
Views: 401

Re: Dimensional Analysis Help[ENDORSED]

Dimensional analysis is essential throughout all of chemistry. We frequently receive values that can't immediately be applied to the equation problem, unless you convert it to it's proper value. It is then you are able to apply it to your equation/problem and solve. For instance, meters to kilometer...