Search found 33 matches

by Daniel Chang 3I
Fri Dec 07, 2018 6:16 pm
Forum: Lewis Acids & Bases
Topic: Ligands
Replies: 7
Views: 83

Re: Ligands

A neutral ligand like H2O would not provide a charge in the complex it is in.
by Daniel Chang 3I
Fri Dec 07, 2018 6:15 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH sig figs
Replies: 4
Views: 45

Re: pH sig figs

pH sig figs are different. You have to count after the decimal places and see how many to include based on the given problem
by Daniel Chang 3I
Fri Dec 07, 2018 6:13 pm
Forum: Conjugate Acids & Bases
Topic: Water as an Acid/Base
Replies: 8
Views: 50

Re: Water as an Acid/Base

Water can be both depending on if its the accepter or donater of a H+ ion
by Daniel Chang 3I
Fri Dec 07, 2018 6:11 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Strong Acids
Replies: 5
Views: 57

Re: Strong Acids

Most equations deal with strong acids so its safer to assume it is strong. However, we need to know the differences between strong and weak acids
by Daniel Chang 3I
Sat Dec 01, 2018 1:51 pm
Forum: Ionic & Covalent Bonds
Topic: Intra vs Intermolecular forces
Replies: 9
Views: 212

Re: Intra vs Intermolecular forces

Intramolecular forces are much stronger as they are heavily involved with sharing or giving/gaining electrons instead of just having interactions between molecules such as intermolecular forces such as DD forces
by Daniel Chang 3I
Sat Dec 01, 2018 1:48 pm
Forum: Sigma & Pi Bonds
Topic: Number of Sigma and Pi Bonds
Replies: 6
Views: 81

Re: Number of Sigma and Pi Bonds

It's due to the number of orbitals. S orbitals have one orbital while P orbitals have three
by Daniel Chang 3I
Sat Dec 01, 2018 1:40 pm
Forum: Student Social/Study Group
Topic: Final
Replies: 12
Views: 233

Re: Final

Yeah. Its on every topic weighted equally according to the email sent out
by Daniel Chang 3I
Sun Nov 25, 2018 9:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 6
Views: 58

Re: Polarity

It is more important to look at the VSEPR shape of the molecule to see if its polar in conjunction with the lone pair to see if its polar or not.
by Daniel Chang 3I
Sun Nov 25, 2018 9:10 pm
Forum: Hybridization
Topic: Octet Expansion
Replies: 6
Views: 67

Re: Octet Expansion

Once the 8 valence electrons from the s and p orbitals are filled up, they have to go to d orbitals where it could hold 10 more pairs of electrons. Then it would go to f and so on
by Daniel Chang 3I
Sun Nov 25, 2018 9:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma Bond vs. Pi Bond
Replies: 3
Views: 49

Re: Sigma Bond vs. Pi Bond

Pi Bonds have electron overlaps on top and bottom of the internuclear axis while sigma bond shave electron overlaps around the axis
by Daniel Chang 3I
Sun Nov 18, 2018 6:58 pm
Forum: Hybridization
Topic: Bond Angles
Replies: 12
Views: 148

Re: Bond Angles

Drawing out the shape of the molecule helps to see where each bond is located and therefore where each bond angle would be. It would be a lot harder to determine bond angles without actually drawing out the shape through VSEPR
by Daniel Chang 3I
Sun Nov 18, 2018 6:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pair?
Replies: 4
Views: 71

Lone Pair?

When there is a lone pair, the bond angle is considered to be less. But is there a way to find out how much the bond angle is affected by each lone pair?
by Daniel Chang 3I
Sun Nov 18, 2018 6:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: No central atom
Replies: 7
Views: 107

Re: No central atom

Since there are only two N atoms, we would use each of those as the central atoms. It would result in a trigonal pyramidal shape with a 109.5 bond angle
by Daniel Chang 3I
Thu Nov 08, 2018 9:20 pm
Forum: Lewis Structures
Topic: Placement of Elements?
Replies: 5
Views: 59

Placement of Elements?

Does it matter if an element is placed on the top or bottom when there 3 connected bonds such as CH3-?
by Daniel Chang 3I
Thu Nov 08, 2018 9:18 pm
Forum: Ionic & Covalent Bonds
Topic: Strength of Bonds?
Replies: 5
Views: 88

Strength of Bonds?

Why are ionic bonds stronger than covalent bonds? And why does polarity matter in terms of strength for covalent bonds?
by Daniel Chang 3I
Thu Nov 08, 2018 9:15 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent Bonds
Replies: 18
Views: 220

Re: Ionic vs Covalent Bonds

Ionic Bonds usually consist of a non-metal and metal that transfer electrons while a covalent bond is between non-metals that share electrons
by Daniel Chang 3I
Sat Nov 03, 2018 4:13 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent Bonds
Replies: 16
Views: 202

Re: Covalent Bonds

non-metals usually are the composition of covalent bonds and therefore share electrons to fill their outer shell and are anions from gaining and sharing electrons
by Daniel Chang 3I
Sat Nov 03, 2018 4:07 pm
Forum: SI Units, Unit Conversions
Topic: Molar Mass to Kg
Replies: 6
Views: 135

Re: Molar Mass to Kg

From mol you would multiply by avogadro's number which would be 6.0221 x 10^23 and then multiply by 10^3 to convert from g to kg.
by Daniel Chang 3I
Sat Nov 03, 2018 4:04 pm
Forum: DeBroglie Equation
Topic: Momentum
Replies: 10
Views: 201

Re: Momentum

you can be given just mass and velocity and you would have to solve it yourself
by Daniel Chang 3I
Thu Oct 25, 2018 10:13 am
Forum: Einstein Equation
Topic: Units
Replies: 10
Views: 212

Re: Units

a Joule multiplied by 1/s is composed of 1kgm^2/s in its simplest form
by Daniel Chang 3I
Thu Oct 25, 2018 10:08 am
Forum: Properties of Light
Topic: Problem B9
Replies: 4
Views: 120

Re: Problem B9

the 1.41x10^20 refers to the number of photons and you would then multiply that number with Avogadro's number
by Daniel Chang 3I
Thu Oct 25, 2018 10:06 am
Forum: Administrative Questions and Class Announcements
Topic: Test On Tuesday
Replies: 10
Views: 373

Re: Test On Tuesday

Wait we should know Lyman and Balmer?
by Daniel Chang 3I
Wed Oct 17, 2018 11:14 pm
Forum: Einstein Equation
Topic: The symbol v?
Replies: 16
Views: 244

The symbol v?

Why is the same symbol used for velocity and frequency? Is there a correlation/connection between them?
by Daniel Chang 3I
Wed Oct 17, 2018 11:11 pm
Forum: Einstein Equation
Topic: Einstein's Equation: E=hv
Replies: 11
Views: 215

Re: Einstein's Equation: E=hv

Planck's Constant which is 6.63*10^-34 Joule*seconds
by Daniel Chang 3I
Wed Oct 17, 2018 11:09 pm
Forum: Properties of Light
Topic: Sig Figs in Problem 1.13 (6th Edition)
Replies: 5
Views: 65

Re: Sig Figs in Problem 1.13 (6th Edition)

It's supposed to be the lowest amount of sig figs from the problem but the TA's said that sig figs shouldn't matter
by Daniel Chang 3I
Wed Oct 10, 2018 9:40 pm
Forum: SI Units, Unit Conversions
Topic: Ways to remember prefixes
Replies: 7
Views: 250

Re: Ways to remember prefixes

I also thought it was only mil, kilo and pico
by Daniel Chang 3I
Tue Oct 09, 2018 3:58 pm
Forum: Balancing Chemical Reactions
Topic: Where to start [ENDORSED]
Replies: 10
Views: 270

Re: Where to start [ENDORSED]

My preference is looking for atoms that appear the fewest amount or looking for atoms with good multiple (3 to 6)
by Daniel Chang 3I
Tue Oct 09, 2018 3:56 pm
Forum: SI Units, Unit Conversions
Topic: What is the notation for molar mass?
Replies: 15
Views: 422

Re: What is the notation for molar mass?

in the textbook, it is grams/mol or g*mol^-1
by Daniel Chang 3I
Tue Oct 09, 2018 3:54 pm
Forum: Significant Figures
Topic: Sig Fig zero rules
Replies: 7
Views: 184

Re: Sig Fig zero rules

Zeros in front of a non-zero number after a decimal point is not counted as a significant figure but the zeros after a decimal point count as a significant figure.
by Daniel Chang 3I
Thu Oct 04, 2018 4:40 pm
Forum: Molarity, Solutions, Dilutions
Topic: Periodic Table and Molar Mass?
Replies: 2
Views: 30

Periodic Table and Molar Mass?

Is the Periodic Table given out during the Test in discussion or is the molar mass of the elements just given on the test?
by Daniel Chang 3I
Thu Oct 04, 2018 4:37 pm
Forum: Significant Figures
Topic: Avogadro's Constant Sig Fig?
Replies: 3
Views: 42

Re: Avogadro's Constant Sig Fig?

Yeah, That makes sense. Thanks!
by Daniel Chang 3I
Thu Oct 04, 2018 4:36 pm
Forum: Significant Figures
Topic: Sig Figs
Replies: 6
Views: 92

Re: Sig Figs

400 only has one significant figure while 400. has three significant figures
by Daniel Chang 3I
Thu Oct 04, 2018 4:28 pm
Forum: Significant Figures
Topic: Avogadro's Constant Sig Fig?
Replies: 3
Views: 42

Avogadro's Constant Sig Fig?

For a few of my questions, I've been using 6.02 times 10^23 as the number and it has caused some answers to be off by a decimal point. Is that okay or should I redo them?

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