Search found 55 matches

by lasarro
Sun Dec 08, 2019 9:47 pm
Forum: Air Pollution & Acid Rain
Topic: Options to reduce acid rain
Replies: 7
Views: 142

Re: Options to reduce acid rain

use slacked lime or quick lime
by lasarro
Sun Dec 08, 2019 9:46 pm
Forum: General Science Questions
Topic: 50 post grade
Replies: 25
Views: 692

Re: 50 post grade

not sure, but I know this post is going to count as one!
by lasarro
Sun Dec 08, 2019 9:37 pm
Forum: Student Social/Study Group
Topic: Practice Final
Replies: 17
Views: 517

Re: Practice Final

Unfortunately not, but the homework problems would help
by lasarro
Sun Dec 08, 2019 9:33 pm
Forum: Student Social/Study Group
Topic: heme complex
Replies: 5
Views: 209

heme complex

how many ligands does a heme complex have
by lasarro
Sun Dec 08, 2019 9:33 pm
Forum: Student Social/Study Group
Topic: stoichiometric point and titrations
Replies: 2
Views: 100

stoichiometric point and titrations

I didn't see titrations on the syllabus, but it was on the final. If I remember correctly, we were told that titrations wouldn't be emphasized. How were we supposed to know it would be on the final??
by lasarro
Sun Dec 08, 2019 9:25 pm
Forum: Student Social/Study Group
Topic: thoughts on final exam
Replies: 4
Views: 183

thoughts on final exam

Feel free to use this thread to talk about the final...
by lasarro
Sun Dec 08, 2019 9:21 pm
Forum: Administrative Questions and Class Announcements
Topic: final
Replies: 1
Views: 60

final

can carbon monoxide bind to a heme complex?
by lasarro
Sat Dec 07, 2019 3:20 pm
Forum: Identifying Acidic & Basic Salts
Topic: solutions of weak acids and bases
Replies: 1
Views: 30

solutions of weak acids and bases

Can someone answer this learning objective from the acids and bases section?

"Why do salts of weak bases produce acidic solutions and salts of weak acids produce basic solutions?"
by lasarro
Sat Nov 30, 2019 11:34 am
Forum: Naming
Topic: ethelynediaminetetraaceto
Replies: 2
Views: 35

ethelynediaminetetraaceto

What is the chemical formula for the ligand ethelynediaminetetraaceto?
by lasarro
Fri Nov 29, 2019 11:56 am
Forum: Bronsted Acids & Bases
Topic: Difference between bronsted and lewis acid/base?
Replies: 6
Views: 46

Re: Difference between bronsted and lewis acid/base?

bronsted refers to an exchange of protons. Lewis refers to an exchange of electrons
by lasarro
Fri Nov 29, 2019 11:23 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: cis platinum
Replies: 6
Views: 53

cis platinum

What is the importance of cisplatinum?
by lasarro
Fri Nov 29, 2019 11:12 am
Forum: Naming
Topic: charge of trnasition metal
Replies: 4
Views: 40

charge of trnasition metal

Is the charge of the transition metal always going to be given to us? If not, how do we know it?
by lasarro
Sat Nov 23, 2019 11:08 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ligand
Replies: 3
Views: 36

ligand

What is a ligand??
by lasarro
Mon Nov 18, 2019 9:34 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Boiling point Pbr3 and PF3
Replies: 1
Views: 31

Boiling point Pbr3 and PF3

Why does PBr3 have a higher boiling point than PF3? I thought since the bonds in PF3 are stronger (smaller atoms--> shorter bond length --> stronger bond) it would have a much higher boiling point than PBr3. The solutions manual says that since PBr3 has more electrons, it has a higher boiling point....
by lasarro
Sun Nov 17, 2019 1:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: vapor pressure
Replies: 4
Views: 33

vapor pressure

Do we have to know vapor pressure for test 2? If so what is it?
by lasarro
Sat Nov 16, 2019 10:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: dipole-dipole
Replies: 3
Views: 45

dipole-dipole

How does NH2OH have a dipole-dipole intermolecular force? That means that NH2OH would have to be a polar molecule, but the electronegativity difference between all the elements is very small. Could someone please explain this? Maybe a picture showing the dipole moment if you could find one?
by lasarro
Fri Nov 15, 2019 8:36 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: regions of electron density
Replies: 7
Views: 62

regions of electron density

What can classify as a region of electron density in a molecule?
by lasarro
Fri Nov 15, 2019 8:35 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: seesaw
Replies: 9
Views: 95

seesaw

What is the seesaw shape?
by lasarro
Fri Nov 15, 2019 8:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: test 2
Replies: 13
Views: 116

test 2

Do we have to know hybridization for test 2?
by lasarro
Fri Nov 15, 2019 8:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: London dispersion forces and vander waals
Replies: 5
Views: 55

London dispersion forces and vander waals

Could someone please give me an example to explain london dispersion forces and vanderwaals.
by lasarro
Fri Nov 15, 2019 8:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: clouds of electrons
Replies: 3
Views: 44

clouds of electrons

In SO2, for the oxygen that has a single bond to the sulfur atom, could we count the 3 lone pairs on the oxygen atom to be its own region of electron density? Or would we count those three lone pairs and the electrons bonded between the sulfur tom as one region of electron density?
by lasarro
Fri Nov 15, 2019 8:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bent v. straight shape
Replies: 3
Views: 45

bent v. straight shape

On exercise 2E.1, it shows 2 ball-stick models. One of them is a bent shape the other is a linear shape. It asks which model would have lone pairs. How would I know which model would or would not have lone pairs based on the ball and stick shapes?
by lasarro
Mon Nov 11, 2019 12:47 pm
Forum: Sigma & Pi Bonds
Topic: Chemical Bonds in chemistry
Replies: 3
Views: 38

Re: Chemical Bonds in chemistry

covalent, ionic and metallic are the 3 types of atomic bonds.
by lasarro
Mon Nov 11, 2019 12:46 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation [ENDORSED]
Replies: 73
Views: 3117

Re: Rydberg equation [ENDORSED]

The Ryberg equation measures energy levels
by lasarro
Mon Nov 11, 2019 12:45 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: nomenclature
Replies: 3
Views: 116

Re: nomenclature

Lavelle hasn't formally discussed nomenclatures yet, so I don't think we should worry about it until it comes up. But it's nice to now basic prefixes like tri- means three and so on.
by lasarro
Mon Nov 11, 2019 12:42 pm
Forum: Octet Exceptions
Topic: More then 8 electrons
Replies: 5
Views: 140

Re: More then 8 electrons

If the highest energy level is a d orbital, then yes, the atom can hold up to 10 valence electrons.
by lasarro
Mon Nov 11, 2019 12:39 pm
Forum: Electronegativity
Topic: Noble Gases
Replies: 19
Views: 635

Re: Noble Gases

Noble gases have no electronegativity because they already have a full octet
by lasarro
Mon Nov 11, 2019 12:39 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dipole moment
Replies: 4
Views: 50

Dipole moment

Can someone please define what a dipole moment is?
by lasarro
Sun Nov 03, 2019 3:45 pm
Forum: Properties of Light
Topic: MeV
Replies: 2
Views: 40

MeV

What does MeV mean?
by lasarro
Sun Nov 03, 2019 3:45 pm
Forum: Resonance Structures
Topic: moving an electron
Replies: 4
Views: 58

moving an electron

Does a resonance structure just mean moving an electron around?
by lasarro
Sun Nov 03, 2019 3:44 pm
Forum: Dipole Moments
Topic: Dipole moment
Replies: 2
Views: 26

Dipole moment

How do you calculate the dipole moment if we are not given the electronegativity values?
by lasarro
Sun Nov 03, 2019 3:42 pm
Forum: Ionic & Covalent Bonds
Topic: middle atom
Replies: 13
Views: 92

middle atom

How do we pick the central atom for a lewis dot structure of a molecule?
by lasarro
Sun Nov 03, 2019 3:42 pm
Forum: Ionic & Covalent Bonds
Topic: observed bond length
Replies: 2
Views: 23

observed bond length

What is an observed bond length and what does it have to do with resonance structures?
by lasarro
Mon Oct 28, 2019 12:08 pm
Forum: Bond Lengths & Energies
Topic: Bond length strength
Replies: 6
Views: 88

Re: Bond length strength

In general, bonding strength and length is proportional to one another. And bond length is always given by experiemental data.
by lasarro
Sat Oct 26, 2019 9:32 am
Forum: Quantum Numbers and The H-Atom
Topic: ionization energy and electron affinty
Replies: 3
Views: 50

ionization energy and electron affinty

What's the difference between electron affinity and ionization energy?
by lasarro
Sat Oct 26, 2019 9:30 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: oribital numbers
Replies: 7
Views: 69

oribital numbers

How do I know how many oribitals there are in s,p,d,f?
by lasarro
Sat Oct 26, 2019 9:25 am
Forum: Trends in The Periodic Table
Topic: atomic radius
Replies: 3
Views: 31

atomic radius

What is an atomic radius and how do we calculate it?
by lasarro
Sat Oct 26, 2019 9:25 am
Forum: Trends in The Periodic Table
Topic: ionic radius
Replies: 3
Views: 30

ionic radius

What is an ionic radius and how do we calculate it?
by lasarro
Sat Oct 26, 2019 9:23 am
Forum: *Shrodinger Equation
Topic: Schrodinger's equation
Replies: 2
Views: 131

Schrodinger's equation

Can someone explain the relationship between schrodingers equation, wave functions and orbitals?
by lasarro
Wed Oct 16, 2019 11:33 pm
Forum: Properties of Light
Topic: Vacuum
Replies: 3
Views: 56

Vacuum

I know the speed of light is 3x 10^8 m/s in a vacuum, but what exactly is a vacuum?
by lasarro
Wed Oct 16, 2019 11:30 pm
Forum: Properties of Light
Topic: What are the units of hertz
Replies: 41
Views: 393

What are the units of hertz

I know Hz is measured per second, but what per second??
by lasarro
Wed Oct 16, 2019 11:29 pm
Forum: Properties of Light
Topic: Speed of light
Replies: 13
Views: 113

Speed of light

Why do we use the speed of light to calculate the wavelength and frequency of electromagnetic waves, like radiowaves?
by lasarro
Wed Oct 16, 2019 11:22 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Best Way To Study?
Replies: 56
Views: 1038

Re: Best Way To Study?

I usually look at the outline and make sure I know every topic on there.
by lasarro
Wed Oct 16, 2019 11:21 pm
Forum: Properties of Electrons
Topic: Momentum
Replies: 11
Views: 84

Momentum

How is momentum defined and is it different than velocity?
by lasarro
Wed Oct 09, 2019 9:17 pm
Forum: Molarity, Solutions, Dilutions
Topic: Symbols for Molarity
Replies: 8
Views: 194

Re: Symbols for Molarity

I would practice with just a symbol and be consistent with it. A lot of the workshops that I went to used problems that only use M as the symbol for molarity, so you may want to use that on your test.
by lasarro
Wed Oct 09, 2019 9:15 pm
Forum: SI Units, Unit Conversions
Topic: Test 1_Supplies [ENDORSED]
Replies: 5
Views: 130

Re: Test 1_Supplies [ENDORSED]

We are also given a reference sheet that has equations, som unit conversions and constants on it.
by lasarro
Wed Oct 09, 2019 9:13 pm
Forum: Significant Figures
Topic: %Mass Composition
Replies: 12
Views: 298

Re: %Mass Composition

The sig figs are determined by the numbers provided in the initial problem. I.e. if a problem included 2.15 then your answer would be 3 sig figs.
by lasarro
Wed Oct 09, 2019 9:11 pm
Forum: Significant Figures
Topic: Range of Sig Figs
Replies: 8
Views: 96

Re: Range of Sig Figs

The number of sig figs are determined by the numbers mentioned in the inital problem.
by lasarro
Wed Oct 09, 2019 9:09 pm
Forum: Properties of Light
Topic: Planck's constant
Replies: 2
Views: 41

Planck's constant

Can someone explain how Planck's constant is derived and its significance?
by lasarro
Thu Oct 03, 2019 11:04 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Aqueous, solid, gas
Replies: 11
Views: 186

Re: Aqueous, solid, gas

In most problems that we have seen so far it usually mentions what state the compound/ molecule/ element is in, so I wouldn't worry about it for now for his upcoming exam.
by lasarro
Mon Sep 30, 2019 8:33 pm
Forum: Significant Figures
Topic: Rounding significant figures when it comes to elements of the periodic table
Replies: 6
Views: 79

Re: Rounding significant figures when it comes to elements of the periodic table

For tests and exams, I would refer directly to the periodic table that is given for the exam and not round numbers.
by lasarro
Mon Sep 30, 2019 8:23 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical Formula
Replies: 7
Views: 89

Re: Empirical Formula

You only assume that the sample is 100g to make the calculations easier. For example if a CH4 sample contains 20% carbon but the sample itself is only 10 grams. You could assume for a second that the sample was 100 grams and 20 grams of that was carbon. Then you could use that ratio to say a 10 g sa...
by lasarro
Mon Sep 30, 2019 8:19 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Mole ratios
Replies: 4
Views: 102

Mole ratios

If you have 0.018 mol NaCl in a NaCl + H2O solution, you also have to have 1 mol of NaCl and 1 H2O because of the stoichiometric coefficients. How can this be possible if you only have 0.018 mol NaCl present in the solution, but you have to have at least 1 mol of NaCl for the solution?
by lasarro
Fri Sep 27, 2019 6:50 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 29
Views: 3040

Re: Ionic vs Covalent

Ionic bonds are usually stronger than covalent bonds. A defining characteristic of ionic bonds is that an electron from one atom is "taken" by another atom, whereas in covalent bonds, the electron is shared between the two atoms.
by lasarro
Fri Sep 27, 2019 6:42 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Stoichiometric reactions
Replies: 5
Views: 1069

Re: Stoichiometric reactions

With stoichiometric problems, think about it as an equation. An equation such as 1=2 is simply not true. In chemistry, it's essentially the same concept. You have to have the same number of atoms on each side of the equation. So if you have N2 on one side you have to have N2 on the other side. The c...

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