Search found 37 matches

by 705088777
Mon Dec 03, 2018 1:23 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: what is a ligand?
Replies: 8
Views: 179

Re: what is a ligand?

A ligand is an ion or molecule attached to a metal atom by coordinate bonding.
by 705088777
Mon Dec 03, 2018 1:19 pm
Forum: Lewis Acids & Bases
Topic: Lewis v. Bronsted
Replies: 2
Views: 64

Re: Lewis v. Bronsted

There are two complementary definitions of acids and bases that are important: the Bronsted (or Bronsted-Lowry) definition: an acid is a proton (H+ ion) donor, and a base is a proton acceptor; the Lewis definition: an acid is an electron acceptor, and a base is an electron donor
by 705088777
Mon Dec 03, 2018 1:16 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Comparing Weak vs. Strong Acids and Bases
Replies: 3
Views: 84

Re: Comparing Weak vs. Strong Acids and Bases

Also, if it is a weak bond then more H+ ions will go into water and therefore its a strong acid
by 705088777
Tue Nov 27, 2018 2:27 pm
Forum: Hybridization
Topic: Lone pairs
Replies: 2
Views: 70

Lone pairs

How do you write/find the hybridization of a lone pair?
by 705088777
Mon Nov 26, 2018 2:44 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order
Replies: 2
Views: 106

Bond Order

is bond order on the test?
by 705088777
Mon Nov 26, 2018 12:48 pm
Forum: Hybridization
Topic: Writing out
Replies: 1
Views: 70

Writing out

Can someone explain how to write out the hybridization. in the textbook it would be like : pi(H1s,C2sp2). What does that mean?
by 705088777
Mon Nov 26, 2018 12:43 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: pi bond
Replies: 4
Views: 117

pi bond

How do you know if a molecule has a delocalized pi bond?
by 705088777
Mon Nov 26, 2018 12:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Dipole Moment
Replies: 1
Views: 53

Dipole Moment

Can someone explain dipole moment and how we can tell if a molecule has it?
by 705088777
Mon Nov 19, 2018 1:31 pm
Forum: Balancing Chemical Reactions
Topic: Why do we balance chemical equations?
Replies: 13
Views: 536

Re: Why do we balance chemical equations?

To show the conservation of mass.
by 705088777
Mon Nov 19, 2018 1:30 pm
Forum: Hybridization
Topic: Hybridization
Replies: 3
Views: 68

Hybridization

Can someone explain hybridization? I was really confused about what it is and how to do it?
by 705088777
Mon Nov 19, 2018 1:26 pm
Forum: Administrative Questions and Class Announcements
Topic: Discussion
Replies: 6
Views: 190

Re: Discussion

Tuesday and Wednesday discussions still take place this week
by 705088777
Mon Nov 12, 2018 3:05 pm
Forum: Ionic & Covalent Bonds
Topic: Boiling Point
Replies: 3
Views: 121

Re: Boiling Point

the more ionic, the higher the boiling point
by 705088777
Mon Nov 12, 2018 3:04 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizing Power
Replies: 5
Views: 127

Re: Polarizing Power

Polarizing power is used to describe cations, which pull electrons away from the anions. Smaller, more positive cations would pull electrons more strongly, so they have more polarizing power (ex. Mg 2+ is small and positive so it has more polarizing power).
by 705088777
Mon Nov 12, 2018 3:03 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 4
Views: 91

Re: Bond Angles

If there are lone pair electrons it will make the degrees slight less than the usual value.
by 705088777
Tue Nov 06, 2018 8:42 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 5
Views: 134

Re: Bond Lengths

Is it because the bonds average out and almost move around?
by 705088777
Tue Nov 06, 2018 8:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: HW for discussion
Replies: 9
Views: 261

HW for discussion

What homework do we do for discussion since we just took a midterm?
by 705088777
Tue Nov 06, 2018 8:38 pm
Forum: Administrative Questions and Class Announcements
Topic: Thanksgiving Wednesday
Replies: 9
Views: 304

Re: Thanksgiving Wednesday

If we have a chem discussion that day will it be canceled too?
by 705088777
Tue Oct 30, 2018 3:03 pm
Forum: Student Social/Study Group
Topic: midterm
Replies: 1
Views: 101

Re: midterm

I think Dr. Lavelle is going to announce it in class or send out an email.
by 705088777
Tue Oct 30, 2018 3:02 pm
Forum: General Science Questions
Topic: Midterm studying
Replies: 10
Views: 399

Re: Midterm studying

The sessions on Sunday with the UA are very helpful too.
by 705088777
Tue Oct 30, 2018 3:01 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: configuration for ions
Replies: 2
Views: 82

configuration for ions

How do you write the electron configurations for ions? like [F]-
by 705088777
Tue Oct 23, 2018 11:18 pm
Forum: Quantum Numbers and The H-Atom
Topic: spin
Replies: 4
Views: 102

spin

How do you know is the spin is + 1/2 or -1/2 or both?
by 705088777
Tue Oct 23, 2018 1:58 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 3
Views: 66

Quantum Numbers

Can someone explain how to do quantum numbers (n,l,ml,ms)??
by 705088777
Tue Oct 23, 2018 12:31 am
Forum: Properties of Electrons
Topic: Nodal surfaces
Replies: 3
Views: 160

Re: Nodal surfaces

Do we need to know this for the test?
by 705088777
Tue Oct 23, 2018 12:30 am
Forum: *Shrodinger Equation
Topic: Test 2 and Shrodinger Equation
Replies: 3
Views: 209

Re: Test 2 and Shrodinger Equation

What is the concept behind the Equation?
by 705088777
Tue Oct 23, 2018 12:26 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavefunction
Replies: 1
Views: 76

Wavefunction

can someone describe what a wave function is and it's probability density? do we need to know it for the test?
by 705088777
Mon Oct 15, 2018 2:07 pm
Forum: DeBroglie Equation
Topic: Rest Mass?
Replies: 4
Views: 128

Re: Rest Mass?

Just think of problems in physics where an object is at rest. This means the velocity=0 because the object is not moving. So in this case, it means the mass of electrons when nothing is moving.
by 705088777
Mon Oct 15, 2018 2:05 pm
Forum: Properties of Light
Topic: Wave Model
Replies: 3
Views: 108

Re: Wave Model

I would just understand the facts that came from the experiment. you should probably know what is in the textbook.
by 705088777
Mon Oct 15, 2018 1:58 pm
Forum: Photoelectric Effect
Topic: Threshold energy [ENDORSED]
Replies: 17
Views: 457

Re: Threshold energy [ENDORSED]

Think of threshold as the minimum grade you need on a test to get an A in the class. That's what the UA described it as.
by 705088777
Mon Oct 08, 2018 7:56 pm
Forum: Molarity, Solutions, Dilutions
Topic: G.21
Replies: 1
Views: 46

G.21

How do I find the concentration of ions in a solution? Do I need to write a net ionic equations?
Question: A solution is prepared by dissolving .500g KCL, .500g K2S, and .500g K3PO4 in 500. ml of water. What is the concentration in the final solution of (a)potassium ions; (b) sulfide ions?
by 705088777
Mon Oct 08, 2018 6:00 pm
Forum: Empirical & Molecular Formulas
Topic: M19
Replies: 3
Views: 170

M19

how are we supposed to determine the molecular formula of caffeine without looking it up?
by 705088777
Mon Oct 08, 2018 3:26 pm
Forum: Empirical & Molecular Formulas
Topic: F.7
Replies: 5
Views: 389

Re: F.7

A metal M forms an oxide with the formula M20, for which the mass percentage of the metal is 88.8%. (a) What is the molar mass of the metal? (b)Write the name of the compound.
by 705088777
Mon Oct 08, 2018 3:19 pm
Forum: Empirical & Molecular Formulas
Topic: F.7
Replies: 5
Views: 389

F.7

How do I find the molar mass of the metal? I did 2x/2x+16 = .888 and solved for x. I got x as 63.43g but that is wrong. Please let me know what I did wrong!
by 705088777
Mon Oct 08, 2018 12:45 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: E3
Replies: 1
Views: 119

E3

I don't understand how to set up an equation for this exercise. Do I find the molar ratio between the two atoms?
by 705088777
Thu Oct 04, 2018 5:44 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Equations
Replies: 2
Views: 64

Re: Balancing Chemical Equations

because we need to compare molar ratios.
by 705088777
Thu Oct 04, 2018 5:33 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals E 19- 7th Edition
Replies: 1
Views: 131

Re: Fundamentals E 19- 7th Edition

I have the same issue! it is so confusing.
by 705088777
Thu Oct 04, 2018 5:31 pm
Forum: Empirical & Molecular Formulas
Topic: HW 1 Problem F.9
Replies: 7
Views: 126

Re: HW 1 Problem F.9

yes they are asking for the empirical formula
by 705088777
Wed Oct 03, 2018 12:18 am
Forum: Molarity, Solutions, Dilutions
Topic: Module question
Replies: 4
Views: 143

Module question

A solution is prepared by dissolving 55.1 g of KCl in approximately 75 mL of water and then adding water to a final volume of 125 mL. What is the molarity of KCl(aq) in this solution? I converted the KCL grams into moles. then I multiplied that by .075L and finally divided by .125L. I'm not getting ...

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