## Search found 42 matches

Thu Jun 14, 2018 2:13 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: French Toast 28
Replies: 3
Views: 215

### Re: French Toast 28

HI has a larger atomic radius and therefore a longer and weaker bond, making it weaker, and a stronger acid bc it can dissociate easily
Thu Jun 14, 2018 12:56 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: strong/weak acids (from review worksheet)
Replies: 1
Views: 190

### strong/weak acids (from review worksheet)

Hi,
Could someone please explain the answer to this question from the review worksheet to me
Wed Jun 13, 2018 1:13 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 17.37
Replies: 1
Views: 122

### 17.37

How do you do this question? how do you use table 17.4 to answer it?
Wed Jun 13, 2018 1:11 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 17.29
Replies: 1
Views: 119

### 17.29

how do you find the oxidation number of the metal?
Wed Jun 13, 2018 1:05 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Homework Problem 17.33.)
Replies: 4
Views: 228

### Re: Homework Problem 17.33.)

what is the relation btwn charge and number of binding sites? i thought the no. of binding sites had to do wiht the number of lone pairs
Wed Jun 13, 2018 1:03 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: ethylenediaminetetraacetato (edta)
Replies: 6
Views: 225

### Re: ethylenediaminetetraacetato (edta)

do we need to memorize the formula for edta?
Wed Jun 13, 2018 12:56 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands and Lone Pairs
Replies: 2
Views: 93

### Re: Ligands and Lone Pairs

in the ligand co32-, why is it that only 2 pairs of electrons are considered binding sites when there are actually 8 lone pairS?
Wed Jun 13, 2018 12:53 am
Forum: Shape, Structure, Coordination Number, Ligands
Topic: HW 17.33
Replies: 6
Views: 265

### Re: HW 17.33

can't co32- technically have 8 binding sites since two of the oxygen atoms have 3 pairs of electrons and one has 2 pairs of electrons?
Tue Jun 05, 2018 7:22 pm
Forum: Hybridization
Topic: BF3
Replies: 1
Views: 92

### Re: BF3

I think that's correct but I believe it forms a pi bond (not positive though)
Tue Jun 05, 2018 7:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.109
Replies: 1
Views: 68

### Re: 4.109

look at the number of regions of electron density around the central atom you are concerned with, ignoring the rest of the compound. (for ex: if there are lone pairs of electrons on parts of the compound that aren't the central atom, it doesn't matter)
Tue Jun 05, 2018 7:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.27
Replies: 2
Views: 91

### Re: 4.27

by the symmetry of the overall molecule (after drawing the lewis structure w/ vsepr in mind)
Mon May 28, 2018 11:33 pm
Forum: Bond Lengths & Energies
Topic: Highest Ionization Energy
Replies: 2
Views: 178

### Re: Highest Ionization Energy

ionization energy increases from left to right and decreases down a group. if the question changes the cation, the molecule with the cation with a higher ionization energy has a greater ionization energy difference. if the question changes the anion, the molecule with the anion with a lower ionizati...
Mon May 28, 2018 11:23 pm
Forum: Bond Lengths & Energies
Topic: HW question 4.1
Replies: 5
Views: 227

### Re: HW question 4.1

if there was no lone pair the bond angle would be 180 degrees. due to the repulsion of the lone pair, the bond angle is reduced from this number
Mon May 28, 2018 11:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.1
Replies: 5
Views: 163

### 4.1

in 1b, how come the molecule can have lone pairs? i thought it couldn't
Mon May 14, 2018 8:17 pm
Forum: Ionic & Covalent Bonds
Topic: 3.23 (meaning of oxidation)
Replies: 7
Views: 261

### Re: 3.23 (meaning of oxidation)

but since chlorine needs to gain an electron shouldn't its oxidation state be -1
Mon May 14, 2018 8:14 pm
Forum: Coordinate Covalent Bonds
Topic: format
Replies: 1
Views: 280

### format

what's the correct format for drawing a coordinate bond? In highschool I remember drawing a line with an arrow; is there any specific notation?
Mon May 14, 2018 8:13 pm
Forum: Formal Charge and Oxidation Numbers
Topic: formal charge
Replies: 11
Views: 413

### formal charge

I wasn't able to attend lecture last class and am unsure about how to calculate formal charge. Is it just the number of electrons to add (resulting in a negative charge) or number of electrons to remove (resulting in a positive charge)
Wed May 09, 2018 11:33 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: q16
Replies: 2
Views: 148

### Re: q16

sorry forgot to specify! chapter 1
Wed May 09, 2018 2:07 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: equation
Replies: 2
Views: 127

### equation

in the answer key, it says the uncertainty eq is ∆p*∆x=1/2*h
i thought it was ∆p*∆x>=h/4pi

i'm getting different answers to those in the answer key and am confused as to the method of solving such questions (like 1.43 for example)
Wed May 09, 2018 1:11 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: conceptual q (based on q 1.43)
Replies: 1
Views: 118

### conceptual q (based on q 1.43)

sometimes the uncertainty is not given and only the position is given (like in 1.43). how can we incorporate this into the equation when this is the actual momentum value, not the momentum value multiplied by the uncertainty.
Tue May 08, 2018 11:38 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Equation
Replies: 2
Views: 134

### Re: Heisenberg Equation

what do you mean by double the uncertainty? wouldn't you just multiply the uncertainty for momentum for example with the actual value of momentum? also im confused because sometimes the uncertainty is not given and only the position is given (like in 1.43). how can we incorporate this into the equat...
Tue May 08, 2018 5:08 pm
Forum: Trends in The Periodic Table
Topic: electron affinity [ENDORSED]
Replies: 15
Views: 455

### electron affinity[ENDORSED]

does electron affinity measure the energy required to gain an electron or the attraction to an electron? for example an element far right on the periodic table would hav a high nuclear charge, and it would be easy to add an electron. does this mean the electron affinity is high (because the attracti...
Tue May 08, 2018 5:04 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: q16
Replies: 2
Views: 148

### q16

how do you do question 16 when both the initial and final n values are unknown?
Tue May 08, 2018 5:02 pm
Forum: SI Units, Unit Conversions
Topic: units
Replies: 4
Views: 268

### units

for the topics covered in test 2, what units are the equations in terms of? some of them are in kg and such but im not sure which ones
Sun May 06, 2018 8:54 pm
Forum: *Shrodinger Equation
Topic: Shrodinger Equation
Replies: 7
Views: 301

### Re: Shrodinger Equation

what kind of questions related to the equation can we expect to see on the midterm?
Sun May 06, 2018 8:50 pm
Forum: Trends in The Periodic Table
Topic: Difference between Periodic trends [ENDORSED]
Replies: 4
Views: 241

### Re: Difference between Periodic trends[ENDORSED]

electron affinity measures the energy change when an electron is added to an atom, whereas electronegativity refers to the attraction an atom has to an electron. one measures an energy difference and the other is a scale of attraction. they are both related, however, as electron affinity decreases (...
Sun May 06, 2018 8:46 pm
Forum: Lewis Structures
Topic: Electron Configuration
Replies: 6
Views: 219

### Re: Electron Configuration

the first shell (n=0) only has one subshell, so it only has s orbitals. after that the second shell (n=1) has two subshells, and therefore has s and p orbitals. the third shell (n=2) has 3 subshells and therefore has s,p, AND d.
Mon Apr 23, 2018 11:45 pm
Forum: Photoelectric Effect
Topic: increasing frequency/ light intensity
Replies: 5
Views: 251

### Re: increasing frequency/ light intensity

what effect does each have on the electrons emitted?
Mon Apr 23, 2018 9:53 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: test 2
Replies: 2
Views: 150

### test 2

is this equation coming in test 2?
Mon Apr 23, 2018 9:52 pm
Forum: *Shrodinger Equation
Topic: double derivative [ENDORSED]
Replies: 2
Views: 241

### double derivative[ENDORSED]

In questions will we receive H as a function? Is it always sin/cos?
Mon Apr 23, 2018 9:51 pm
Forum: Photoelectric Effect
Topic: increasing frequency/ light intensity
Replies: 5
Views: 251

### increasing frequency/ light intensity

what does increasing the frequency/ light intensity do? are they the same thing? if not what's the difference?
Sat Apr 21, 2018 11:53 am
Forum: Properties of Light
Topic: test 2
Replies: 18
Views: 543

### test 2

For test 2, will the questions be only numericals or will we have to answer qualitative questions too?
Mon Apr 16, 2018 11:00 pm
Forum: Properties of Light
Topic: Planck's constant
Replies: 1
Views: 74

### Planck's constant

what does planck's constant signify?
Mon Apr 16, 2018 10:59 pm
Forum: Limiting Reactant Calculations
Topic: moles + limiting reactant
Replies: 2
Views: 188

### moles + limiting reactant

Is the limiting reactant the reactant with the number of moles only if the mass is the same? if the mass is different how do you determine the limiting reactant
Mon Apr 16, 2018 10:57 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Bohr frequency condition
Replies: 1
Views: 79

### Bohr frequency condition

Hi,

I know what the formula is for the Bohr frequency condition, but I'm not sure about what it signifies. What is the condition and what does it apply to?
Tue Apr 10, 2018 1:36 am
Forum: Molarity, Solutions, Dilutions
Topic: G 13 [ENDORSED]
Replies: 1
Views: 81

### G 13[ENDORSED]

I got the concentration of the diluted solution as 0.05M, and so shouldn't the number of mols of the compound when the volume is 0.1L be 0.2? not sure why the answer is 0.01
Mon Apr 09, 2018 9:47 pm
Forum: Significant Figures
Topic: Sig Figs [ENDORSED]
Replies: 2
Views: 126

### Re: Sig Figs[ENDORSED]

I think we will be penalized for incorrect sig figs in the tests after this one though
Mon Apr 09, 2018 8:46 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Homework Question E9a
Replies: 2
Views: 198

### Re: Homework Question E9a

Since 6.022*10^23 is the number of particles (atoms, molecules, etc) in one mole, and since oxygen is repeated 11 times in the formula, we multiply the number of moles of oxygen by 6.02*10^23 to find the number of atoms in one mole. We multiplt 11 to this number since oxygen is repeated 11 times. I ...
Mon Apr 09, 2018 8:18 pm
Forum: SI Units, Unit Conversions
Topic: Length Units
Replies: 15
Views: 494

### Re: Length Units

I think so
Mon Apr 09, 2018 8:17 pm
Forum: SI Units, Unit Conversions
Topic: Moles mols mol? [ENDORSED]
Replies: 21
Views: 959

### Re: Moles mols mol?[ENDORSED]

Mole is the noun, referring to the concept, and mol is the unit for moles, as far as I remember.
Mon Apr 09, 2018 8:15 pm
Forum: SI Units, Unit Conversions
Topic: Temperature
Replies: 5
Views: 248

### Re: Temperature

there are 3 units because it is easier to use some when dealing with certain temperature scales. On a day to day basis, it is easier to use celsius or farenheit because we are not dealing with large numbers or very positive/negative temperatures for which kelvin might be more suitable.
Mon Apr 09, 2018 7:13 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 902082

### Re: Post All Chemistry Jokes Here

what kind of dog do chemists have? laboratory retrievers