Search found 51 matches
- Sat Dec 07, 2019 2:30 pm
- Forum: Conjugate Acids & Bases
- Topic: studying
- Replies: 7
- Views: 594
Re: studying
The UAs mentioned that it would be helpful to know the list of most common strong acids and bases, so when you see an ion you can tell if it came from a strong acid or not, etc.
- Sat Dec 07, 2019 2:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: cis vs trans
- Replies: 5
- Views: 433
Re: cis vs trans
Cis means that the function groups are on the same sides.
Trans means they are on the opposite of each other.
We learned about cis and trans platin in class.
Cisplatin is bioactive and is used in chemotherapy. It has 2 Cls on the same side. Those 2Cls can bind to 2 Guanines and block cell division.
Trans means they are on the opposite of each other.
We learned about cis and trans platin in class.
Cisplatin is bioactive and is used in chemotherapy. It has 2 Cls on the same side. Those 2Cls can bind to 2 Guanines and block cell division.
- Sat Dec 07, 2019 2:19 pm
- Forum: Hybridization
- Topic: Lone pairs
- Replies: 4
- Views: 325
Re: Lone pairs
They do count as 1 region of electron density around the atom.
- Fri Dec 06, 2019 5:10 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Acids/Bases in Equations
- Replies: 5
- Views: 361
Re: Bronsted Acids/Bases in Equations
A Bronsted Acid is a proton donor, and a bronzed base is a proton acceptor
For Lewis Acids, they accepts electron pairs and lewis bases donate electron pairs.
They are the same thing but expressed through different functions.
For Lewis Acids, they accepts electron pairs and lewis bases donate electron pairs.
They are the same thing but expressed through different functions.
- Fri Dec 06, 2019 5:02 pm
- Forum: Biological Examples
- Topic: biological significance
- Replies: 2
- Views: 209
Re: biological significance
my TA told us that we should now cis/trans platin (why cis platin is used in chemotherapy, etc.) and the myoglobin- hemoglobin ring (why carbon monoxide is poisonous, etc.) I believe that's all.
- Sun Dec 01, 2019 8:37 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Acid and Base
- Replies: 5
- Views: 271
Re: Bronsted Acid and Base
Yes, for Bronsted Acids and Bases, we talk about the reaction of a molecule in regards to H+.
If a molecule donates H+, that is a Bronsted Acid (proton donor)
If a molecule accepts H+, that is a Bronsted Base (proton acceptor)
If a molecule donates H+, that is a Bronsted Acid (proton donor)
If a molecule accepts H+, that is a Bronsted Base (proton acceptor)
- Sun Dec 01, 2019 8:00 pm
- Forum: Lewis Acids & Bases
- Topic: Proton acceptor and proton donor?
- Replies: 33
- Views: 2024
Re: Proton acceptor and proton donor?
Acids will give out H+, making them proton donors.
Bases will gain the H+, making them the proton acceptors.
Bases will gain the H+, making them the proton acceptors.
- Sun Dec 01, 2019 7:58 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Relative acidity
- Replies: 7
- Views: 509
Re: Relative acidity
Stability is achieved by withdrawing electron from the negatively charged atom. In the HCl and HI examples; Between Cl-O, Cl has an inductive effect (same thing as electronegativity), pulling O's electrons thus stabilizing the negatively charged O. With I-O, I does not have as high of an inductive e...
- Sun Dec 01, 2019 7:43 pm
- Forum: Lewis Structures
- Topic: Bent or Angular?
- Replies: 18
- Views: 1047
Re: Bent or Angular?
They both refer to the same thing. It doesn't matter which one you use.
- Sun Dec 01, 2019 7:42 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: sigma bond
- Replies: 11
- Views: 708
Re: sigma bond
Sigma bonds are first to form between atoms. They are formed by atomic orbital overlap and they allow for rotation.
- Fri Nov 22, 2019 6:14 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pairs
- Replies: 13
- Views: 708
Re: Lone pairs
Lone pairs do count as 1 area of electron density. So with VSEPR you have to consider them. But while just drawing the lewis structure you don't have the account for the affect of the lone pair on other bonds. You just draw it and place the lone pairs. But for electron geometry, lone pairs will push...
- Fri Nov 22, 2019 6:05 pm
- Forum: Bond Lengths & Energies
- Topic: Boiling Point vs Melting Point
- Replies: 5
- Views: 615
Re: Boiling Point vs Melting Point
Boiling means to transform a liquid substance into vapor or gas.
Melting means to transform from a solid state of matter to liquid.
When it comes to measuring IM force strength, they mean the same thing. The higher point means that the molecule has stronger IM forces.
Melting means to transform from a solid state of matter to liquid.
When it comes to measuring IM force strength, they mean the same thing. The higher point means that the molecule has stronger IM forces.
- Fri Nov 22, 2019 5:57 pm
- Forum: Sigma & Pi Bonds
- Topic: Why are sigma bonds stronger than pi bonds?
- Replies: 6
- Views: 364
Re: Why are sigma bonds stronger than pi bonds?
There is more, almost direct, orbital contact in Sigma Bonds. Sigma bonds are formed by head-on overlap, whereas Pi bonds form through side ways.
- Fri Nov 22, 2019 5:53 pm
- Forum: *Particle in a Box
- Topic: TEST 2
- Replies: 14
- Views: 1283
Re: TEST 2
There are no equations that you need to know for Test 2. It mostly covers the VSEPR structures and IM forces.
- Fri Nov 22, 2019 5:49 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Acids
- Replies: 6
- Views: 442
Re: Acids
A strong acid is one that dissolves completely into its ions in water. A weak acid would only partially dissolve. A weak acid would have a higher pH than a strong acid. Strong acids have pHs closer to 0 and less than pH 7.
- Wed Nov 13, 2019 10:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Molecular Shape Name
- Replies: 17
- Views: 818
Re: Molecular Shape Name
It's definitely important to know the geometric names. They are the whole point with VSEPR. And Dr. Lavelle mentioned certain details that we don't need to know like the diagrams where it shows which part of the molecule is closer and which atoms are in the back . But the shape, name and the angle w...
- Wed Nov 13, 2019 10:17 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Boiling Point
- Replies: 6
- Views: 377
Re: Boiling Point
The highest boiling point would be of the strongest molecule. Molecule's strength is measured by its intermolecular forces.
Ionic bonded molecules would have the highest boiling point.
London Dispersion forces would be the easiest to break resulting in lowest boiling points.
Ionic bonded molecules would have the highest boiling point.
London Dispersion forces would be the easiest to break resulting in lowest boiling points.
- Wed Nov 13, 2019 10:09 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Memorization
- Replies: 15
- Views: 949
Re: Memorization
Yes, I think we are expected to know what the geometrical shape is called and its distinctive characteristics like the bond angles.
- Wed Nov 13, 2019 10:07 pm
- Forum: SI Units, Unit Conversions
- Topic: Memorizing Conversions
- Replies: 25
- Views: 1288
Re: Memorizing Conversions
you are expected to know the general idea of conversion but there will be a formula sheet given for the exams.
- Wed Nov 13, 2019 10:01 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: intermolecular forces
- Replies: 8
- Views: 546
Re: intermolecular forces
No we are not expected to know the electronegativities. If we need to use them in a question they would include them in the question as a footnote.
- Thu Nov 07, 2019 5:00 pm
- Forum: Ionic & Covalent Bonds
- Topic: Why is the ionization energy of nitrogen higher than that of oxygen's?
- Replies: 11
- Views: 889
Re: Why is the ionization energy of nitrogen higher than that of oxygen's?
nitrogen has a half filled 2p orbital. this makes it more symmetrical therefore more stable. it is harder to get the electron form a highly stable atom. Even though application of periodic table trends indicates that Oxygen should have a higher first ionization energy, it is not the case with nitrog...
- Thu Nov 07, 2019 4:56 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: central atom
- Replies: 21
- Views: 908
Re: central atom
you would want the central atom to have the lowest possible formal charge. It is better for outside atoms to carry the charge than the central atom.
- Thu Nov 07, 2019 4:54 pm
- Forum: Electronegativity
- Topic: Trend of Electronegativity
- Replies: 22
- Views: 2030
Re: Trend of Electronegativity
ionization energy and electronegativity follow the same trend. Going down the periodic table they decrease and going right, they increase.
this makes fluorine the most electronegative atom.
cesium has the lowest ionization energy.
this makes fluorine the most electronegative atom.
cesium has the lowest ionization energy.
- Thu Nov 07, 2019 4:50 pm
- Forum: Bond Lengths & Energies
- Topic: Bond strengths
- Replies: 9
- Views: 501
Re: Bond strengths
when the bonds get shorter they get increasingly stronger. ex: single bonds being longest and weakest, triple bonds being shortest and strongest.
- Thu Nov 07, 2019 4:48 pm
- Forum: Ionic & Covalent Bonds
- Topic: Mini Dino Nuggets 2b
- Replies: 6
- Views: 236
Re: Mini Dino Nuggets 2b
fluorine is the most electronegative (increases towards right upper corner of periodic table) element making the C-F bond more ionic.
- Sun Nov 03, 2019 9:30 pm
- Forum: Bond Lengths & Energies
- Topic: Dino Nugget Mini review
- Replies: 2
- Views: 207
Dino Nugget Mini review
a) Comment on the relative bond strength and length of the C–O bond in carbon dioxide, CO2, and H, CH3O H.
How would we solve it ?
How would we solve it ?
- Sun Nov 03, 2019 9:25 pm
- Forum: Trends in The Periodic Table
- Topic: Dino Nugget Mini review
- Replies: 3
- Views: 223
Dino Nugget Mini review
a) Which ion has the most polarizing power? Why? Li+ Na+ K+
how would we solve this question?
how would we solve this question?
- Sun Nov 03, 2019 9:20 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Rules for n, l,m
- Replies: 11
- Views: 545
Re: Rules for n, l,m
n = shell= indicates row and the energy
l = subshell, relates to the shape, can be from n-1
ml = orientation = "s" is sphere etc
ms = electron spin= can be either -1/2 or + 1/2
l = subshell, relates to the shape, can be from n-1
ml = orientation = "s" is sphere etc
ms = electron spin= can be either -1/2 or + 1/2
- Sun Nov 03, 2019 9:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs Covalent
- Replies: 14
- Views: 827
Re: Ionic vs Covalent
ionic bonds are between a metal and a nonmetal. They occur through electrostatic attraction of the cation metal and anion nonmetal.
Covalent bonds are between nonmetal atoms. It is through electron sharing.
Covalent bonds are between nonmetal atoms. It is through electron sharing.
- Sun Nov 03, 2019 9:08 pm
- Forum: Ionic & Covalent Bonds
- Topic: middle atom
- Replies: 13
- Views: 498
Re: middle atom
you should pick the central atom based on electronegativity. the least electronegative should be in the middle. You can also use ionization energy as an indicator. It should be the lowest as well for the central atom.
- Sun Oct 27, 2019 4:03 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: The exceptions
- Replies: 2
- Views: 156
The exceptions
Why are Copper and Chronium the exceptions when it comes to electron configuration ?
- Sun Oct 27, 2019 4:00 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Shielding
- Replies: 3
- Views: 173
Electron Shielding
Can someone explain this phenomenon and also penetration? I know that they effect the radius but I don' understand how it does not have any correlation with the subshells but it depends on the Principal Quantum Number?
- Sun Oct 27, 2019 3:55 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Where electrons are more likely to be found
- Replies: 1
- Views: 162
Where electrons are more likely to be found
I know that for "s", the electrons are more likely to be near the nucleus but what is the case for "p" and "d"
Is it more unlikely to find the electrons near the nucleus because of the shape of the subshells? thank you
Is it more unlikely to find the electrons near the nucleus because of the shape of the subshells? thank you
- Sun Oct 27, 2019 3:52 pm
- Forum: Trends in The Periodic Table
- Topic: Focus 1 1.31 Atoms
- Replies: 1
- Views: 94
Focus 1 1.31 Atoms
1.31 In a recent suspense film, two secret agents must penetrate a criminal's stronghold monitored by a lithium photomultiplier cell that is continually bathed in light from a laser. If the beam of light is broken, an alarm sounds. The agents want to use a hand- held laser to illuminate the cell whi...
- Mon Oct 21, 2019 11:42 pm
- Forum: Properties of Light
- Topic: Video module test Question-ATOMIC SPECTRA
- Replies: 1
- Views: 96
Video module test Question-ATOMIC SPECTRA
The meter was defined in 1963 as 1,650,763.73 wavelengths of radiation emitted by krypton-86 (it has since been redefined). What is the wavelength of this krypton-86 radiation? To what region of the electromagnetic spectrum does this wavelength correspond (i.e. infrared, ultraviolet, x-ray, etc.)? W...
- Mon Oct 21, 2019 11:40 pm
- Forum: Limiting Reactant Calculations
- Topic: Missed this Question on Test1
- Replies: 5
- Views: 646
Re: Missed this Question on Test1
Yes there are different versions of the test for each TA's discussion class I believe. Thanks for the answer though.
- Sat Oct 19, 2019 4:41 pm
- Forum: Photoelectric Effect
- Topic: Video module Test
- Replies: 3
- Views: 159
Video module Test
If 3.607 x 10-19 J is required to remove an electron with zero kinetic energy from a metal surface, what would be the longest wavelength light that could do this?
How would we be able to use the J with the equations?
How would we be able to use the J with the equations?
- Sat Oct 19, 2019 4:38 pm
- Forum: Properties of Electrons
- Topic: Textbook 1B.21
- Replies: 2
- Views: 104
Textbook 1B.21
1B.21 A baseball must weigh between 5.00 and 5.25 ounces (1 ounce 5 28.3 g). What is the wavelength of a 5.15-ounce base- ball thrown at 92 mph?
Which equations to use?
Which equations to use?
- Sat Oct 19, 2019 4:30 pm
- Forum: Properties of Light
- Topic: Difference between photon vs particle
- Replies: 5
- Views: 518
Difference between photon vs particle
There was a question on the video assignment modules about this.
One answer had "photon" and the other one was "particle"
I thought they were interchangeable, but it seems like one is more appropriate than the other in some instances. Can someone explain?
One answer had "photon" and the other one was "particle"
I thought they were interchangeable, but it seems like one is more appropriate than the other in some instances. Can someone explain?
- Sat Oct 19, 2019 4:18 pm
- Forum: Photoelectric Effect
- Topic: Chem Video Module-test, Joule Conversion
- Replies: 2
- Views: 134
Chem Video Module-test, Joule Conversion
Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. Answer the following three questions. A. What is the kinetic energy of the ejected electron? How would we solve the question? How to convert kJ to use for t...
- Sat Oct 19, 2019 2:47 pm
- Forum: Limiting Reactant Calculations
- Topic: Missed this Question on Test1
- Replies: 5
- Views: 646
Missed this Question on Test1
If 10.00 g of glucose is initially present and 5.00 g of H2O is formed, how much grams of glucose is left over? How many moles of O2 were initially present? (glucose is 180.156 g/mol) C6H12O6 + 6O2 -> 6CO2 + 6 H2O + ENERGY I missed this question on Test 1. Can someone explain how to solve this probl...
- Sat Oct 12, 2019 2:54 pm
- Forum: Properties of Light
- Topic: Textbook 1B.15
- Replies: 1
- Views: 71
Textbook 1B.15
The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 3 103 km?s2 1. (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50 3 1016 Hz. How much energy is require...
- Sat Oct 12, 2019 2:45 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Textbook 1B.25
- Replies: 1
- Views: 78
Textbook 1B.25
What is the minimum uncertainty in the speed of an electron confined within a lead atom of diameter 350. pm? Model the atom as a one-dimensional box with a length equal to the diameter of the actual atom. Can someone explain the question? I could not manage to express "uncertainty in the positi...
- Sat Oct 12, 2019 2:22 pm
- Forum: Limiting Reactant Calculations
- Topic: Wrong calculation-can' find the Lim. Reactant
- Replies: 2
- Views: 248
Wrong calculation-can' find the Lim. Reactant
4NH3 + 5O2 ->4NO + 6H20
21.4 g NH3 42.5g O2
Calculate the products in grams?
I get 1.26 moles of NH3 and 1.33 mol of O2 but can't get the calculation right afterwards? How would you solve this?
21.4 g NH3 42.5g O2
Calculate the products in grams?
I get 1.26 moles of NH3 and 1.33 mol of O2 but can't get the calculation right afterwards? How would you solve this?
- Thu Oct 10, 2019 11:05 pm
- Forum: Limiting Reactant Calculations
- Topic: Can't Find Limiting Reactant
- Replies: 4
- Views: 328
Can't Find Limiting Reactant
For the following reaction, how many grams of AlCl3 would be obtained if 5.43g of aluminum and 7.80g of hydrogen chloride (HCl) was used in the reaction?
Al (s) + HCl (aq) → AlCl3 (aq) + H2 (g)
I keep getting the calculations wrong? can someone explain step by step?
Al (s) + HCl (aq) → AlCl3 (aq) + H2 (g)
I keep getting the calculations wrong? can someone explain step by step?
- Thu Oct 10, 2019 9:51 pm
- Forum: Empirical & Molecular Formulas
- Topic: Mass Percentage Question
- Replies: 9
- Views: 845
Mass Percentage Question
What is the mass percent of the elements in Sr(NO2)2 ?
how would you start to solve this question?
how would you start to solve this question?
- Fri Oct 04, 2019 11:14 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Showing work in detail
- Replies: 7
- Views: 613
Showing work in detail
How detailed does the dimensional analysis have to be?
For example do we need to write the units for every equation to show how they cancel each other out?
For example do we need to write the units for every equation to show how they cancel each other out?
- Fri Oct 04, 2019 11:10 pm
- Forum: Limiting Reactant Calculations
- Topic: Textbook M15-Calculation?
- Replies: 3
- Views: 172
Textbook M15-Calculation?
Aluminum metal reacts with chlorine gas to produce aluminum chloride. In one preparation, 255 g of aluminum is placed in a container holding 535 g of chlorine gas. After reaction ceases, it is found that 300. g of aluminum chloride has been produced. c)What is the percentage yield of aluminum chlori...
- Fri Oct 04, 2019 11:03 pm
- Forum: Balancing Chemical Reactions
- Topic: Textbook H19
- Replies: 1
- Views: 544
Textbook H19
"Aspartame, C14H18N2O5, is a solid used as an artificial sweetener. Write the balanced equation for its combustion to carbon dioxide gas, liquid water, and nitrogen gas."
How would this equation be balanced?
How would this equation be balanced?
- Fri Oct 04, 2019 10:52 pm
- Forum: Balancing Chemical Reactions
- Topic: Chemical Equations H11
- Replies: 1
- Views: 99
Chemical Equations H11
How would we write the equation for:
Fe2O32's reaction with carbon monoxide?
Fe2O32's reaction with carbon monoxide?
- Fri Oct 04, 2019 10:19 pm
- Forum: Balancing Chemical Reactions
- Topic: Reaction Stoichiometry L.35
- Replies: 2
- Views: 199
Reaction Stoichiometry L.35
Sodium bromide, NaBr, which is used to produce AgBr for use in photographic film, can itself be prepared as follows... Fe+Br2->FeBr2 FeBr2+ Br2->Fe3Br8 Fe3Br8+ Na2CO3-> NaBr+ CO2+ Fe3O4 What is the mass of iron in kg is needed to produce 2.50 t of NaBr (equations must be first balanced) - I keep get...