Search found 51 matches

by derinceltik1K
Sat Dec 07, 2019 2:30 pm
Forum: Conjugate Acids & Bases
Topic: studying
Replies: 5
Views: 128

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.
by derinceltik1K
Sat Dec 07, 2019 2:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: cis vs trans
Replies: 5
Views: 130

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.
by derinceltik1K
Sat Dec 07, 2019 2:19 pm
Forum: Hybridization
Topic: Lone pairs
Replies: 4
Views: 99

Re: Lone pairs

They do count as 1 region of electron density around the atom.
by derinceltik1K
Fri Dec 06, 2019 5:10 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acids/Bases in Equations
Replies: 5
Views: 57

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.
by derinceltik1K
Fri Dec 06, 2019 5:02 pm
Forum: Biological Examples
Topic: biological significance
Replies: 2
Views: 46

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.
by derinceltik1K
Sun Dec 01, 2019 8:37 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acid and Base
Replies: 5
Views: 55

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)
by derinceltik1K
Sun Dec 01, 2019 8:00 pm
Forum: Lewis Acids & Bases
Topic: Proton acceptor and proton donor?
Replies: 33
Views: 285

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.
by derinceltik1K
Sun Dec 01, 2019 7:58 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Relative acidity
Replies: 7
Views: 132

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...
by derinceltik1K
Sun Dec 01, 2019 7:43 pm
Forum: Lewis Structures
Topic: Bent or Angular?
Replies: 15
Views: 312

Re: Bent or Angular?

They both refer to the same thing. It doesn't matter which one you use.
by derinceltik1K
Sun Dec 01, 2019 7:42 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: sigma bond
Replies: 7
Views: 176

Re: sigma bond

Sigma bonds are first to form between atoms. They are formed by atomic orbital overlap and they allow for rotation.
by derinceltik1K
Fri Nov 22, 2019 6:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs
Replies: 13
Views: 116

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...
by derinceltik1K
Fri Nov 22, 2019 6:05 pm
Forum: Bond Lengths & Energies
Topic: Boiling Point vs Melting Point
Replies: 5
Views: 161

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.
by derinceltik1K
Fri Nov 22, 2019 5:57 pm
Forum: Sigma & Pi Bonds
Topic: Why are sigma bonds stronger than pi bonds?
Replies: 6
Views: 88

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.
by derinceltik1K
Fri Nov 22, 2019 5:53 pm
Forum: *Particle in a Box
Topic: TEST 2
Replies: 13
Views: 387

Re: TEST 2

There are no equations that you need to know for Test 2. It mostly covers the VSEPR structures and IM forces.
by derinceltik1K
Fri Nov 22, 2019 5:49 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Acids
Replies: 6
Views: 47

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.
by derinceltik1K
Wed Nov 13, 2019 10:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape Name
Replies: 17
Views: 230

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...
by derinceltik1K
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: 75

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.
by derinceltik1K
Wed Nov 13, 2019 10:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Memorization
Replies: 15
Views: 188

Re: Memorization

Yes, I think we are expected to know what the geometrical shape is called and its distinctive characteristics like the bond angles.
by derinceltik1K
Wed Nov 13, 2019 10:07 pm
Forum: SI Units, Unit Conversions
Topic: Memorizing Conversions
Replies: 23
Views: 495

Re: Memorizing Conversions

you are expected to know the general idea of conversion but there will be a formula sheet given for the exams.
by derinceltik1K
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: 96

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.
by derinceltik1K
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: 135

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...
by derinceltik1K
Thu Nov 07, 2019 4:56 pm
Forum: Formal Charge and Oxidation Numbers
Topic: central atom
Replies: 21
Views: 228

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.
by derinceltik1K
Thu Nov 07, 2019 4:54 pm
Forum: Electronegativity
Topic: Trend of Electronegativity
Replies: 22
Views: 277

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.
by derinceltik1K
Thu Nov 07, 2019 4:50 pm
Forum: Bond Lengths & Energies
Topic: Bond strengths
Replies: 9
Views: 80

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.
by derinceltik1K
Thu Nov 07, 2019 4:48 pm
Forum: Ionic & Covalent Bonds
Topic: Mini Dino Nuggets 2b
Replies: 6
Views: 94

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.
by derinceltik1K
Sun Nov 03, 2019 9:30 pm
Forum: Bond Lengths & Energies
Topic: Dino Nugget Mini review
Replies: 2
Views: 63

Dino Nugget Mini review

a) Comment on the relative bond strength and length of the C–O bond in carbon dioxide, CO​2,​ and H, CH​3O​ H.

How would we solve it ?
by derinceltik1K
Sun Nov 03, 2019 9:25 pm
Forum: Trends in The Periodic Table
Topic: Dino Nugget Mini review
Replies: 3
Views: 102

Dino Nugget Mini review

a) Which ion has the most polarizing power? Why? Li+​ Na+​ K+​

how would we solve this question?
by derinceltik1K
Sun Nov 03, 2019 9:20 pm
Forum: Quantum Numbers and The H-Atom
Topic: Rules for n, l,m
Replies: 11
Views: 157

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
by derinceltik1K
Sun Nov 03, 2019 9:14 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent
Replies: 14
Views: 174

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.
by derinceltik1K
Sun Nov 03, 2019 9:08 pm
Forum: Ionic & Covalent Bonds
Topic: middle atom
Replies: 13
Views: 94

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.
by derinceltik1K
Sun Oct 27, 2019 4:03 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: The exceptions
Replies: 2
Views: 34

The exceptions

Why are Copper and Chronium the exceptions when it comes to electron configuration ?
by derinceltik1K
Sun Oct 27, 2019 4:00 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Shielding
Replies: 3
Views: 31

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?
by derinceltik1K
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: 53

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
by derinceltik1K
Sun Oct 27, 2019 3:52 pm
Forum: Trends in The Periodic Table
Topic: Focus 1 1.31 Atoms
Replies: 1
Views: 39

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...
by derinceltik1K
Mon Oct 21, 2019 11:42 pm
Forum: Properties of Light
Topic: Video module test Question-ATOMIC SPECTRA
Replies: 1
Views: 51

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...
by derinceltik1K
Mon Oct 21, 2019 11:40 pm
Forum: Limiting Reactant Calculations
Topic: Missed this Question on Test1
Replies: 5
Views: 209

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.
by derinceltik1K
Sat Oct 19, 2019 4:41 pm
Forum: Photoelectric Effect
Topic: Video module Test
Replies: 3
Views: 79

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?
by derinceltik1K
Sat Oct 19, 2019 4:38 pm
Forum: Properties of Electrons
Topic: Textbook 1B.21
Replies: 2
Views: 42

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?
by derinceltik1K
Sat Oct 19, 2019 4:30 pm
Forum: Properties of Light
Topic: Difference between photon vs particle
Replies: 5
Views: 61

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?
by derinceltik1K
Sat Oct 19, 2019 4:18 pm
Forum: Photoelectric Effect
Topic: Chem Video Module-test, Joule Conversion
Replies: 2
Views: 48

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...
by derinceltik1K
Sat Oct 19, 2019 2:47 pm
Forum: Limiting Reactant Calculations
Topic: Missed this Question on Test1
Replies: 5
Views: 209

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...
by derinceltik1K
Sat Oct 12, 2019 2:54 pm
Forum: Properties of Light
Topic: Textbook 1B.15
Replies: 1
Views: 32

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...
by derinceltik1K
Sat Oct 12, 2019 2:45 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Textbook 1B.25
Replies: 1
Views: 35

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...
by derinceltik1K
Sat Oct 12, 2019 2:22 pm
Forum: Limiting Reactant Calculations
Topic: Wrong calculation-can' find the Lim. Reactant
Replies: 2
Views: 143

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?
by derinceltik1K
Thu Oct 10, 2019 11:05 pm
Forum: Limiting Reactant Calculations
Topic: Can't Find Limiting Reactant
Replies: 4
Views: 228

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?
by derinceltik1K
Thu Oct 10, 2019 9:51 pm
Forum: Empirical & Molecular Formulas
Topic: Mass Percentage Question
Replies: 9
Views: 432

Mass Percentage Question

What is the mass percent of the elements in Sr(NO2)2 ?

how would you start to solve this question?
by derinceltik1K
Fri Oct 04, 2019 11:14 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Showing work in detail
Replies: 7
Views: 295

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?
by derinceltik1K
Fri Oct 04, 2019 11:10 pm
Forum: Limiting Reactant Calculations
Topic: Textbook M15-Calculation?
Replies: 3
Views: 56

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...
by derinceltik1K
Fri Oct 04, 2019 11:03 pm
Forum: Balancing Chemical Reactions
Topic: Textbook H19
Replies: 1
Views: 50

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?
by derinceltik1K
Fri Oct 04, 2019 10:52 pm
Forum: Balancing Chemical Reactions
Topic: Chemical Equations H11
Replies: 1
Views: 67

Chemical Equations H11

How would we write the equation for:
Fe2O32's reaction with carbon monoxide?
by derinceltik1K
Fri Oct 04, 2019 10:19 pm
Forum: Balancing Chemical Reactions
Topic: Reaction Stoichiometry L.35
Replies: 2
Views: 74

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...

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