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: 580
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: 481
strong/weak acids (from review worksheet)
Hi,
Could someone please explain the answer to this question from the review worksheet to me
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: 341
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: 265
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: 655
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: 1454
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: 495
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: 812
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: 390
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: 267
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: 384
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: 455
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: 675
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: 662
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: 947
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: 698
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: 1679
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: 395
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: 392
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)
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: 301
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: 366
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: 2044
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: 395
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: 669
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: 874
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: 678
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: 792
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: 1361
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: 384
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: 499
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: 1361
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: 1661
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: 179
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: 458
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: 173
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?
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: 216
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: 340
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: 398
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: 1536
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: 9353
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: 753
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: 9651
- Views: 3917167
Re: Post All Chemistry Jokes Here
what kind of dog do chemists have? laboratory retrievers