Search found 56 matches

by Alvaro Chumpitaz 4D
Sat Dec 07, 2019 5:57 pm
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted
Replies: 3
Views: 29

Lewis vs Bronsted

Can a compound be a Lewis acid but not a Bronsted acid?
by Alvaro Chumpitaz 4D
Sat Dec 07, 2019 5:56 pm
Forum: Coordinate Covalent Bonds
Topic: Just to clear it up
Replies: 1
Views: 120

Just to clear it up

So are the the atoms that create coordinate covalent bonds, Lewis bases?
by Alvaro Chumpitaz 4D
Sat Dec 07, 2019 5:54 pm
Forum: Trends in The Periodic Table
Topic: Exceptions to Electronegativity
Replies: 6
Views: 153

Exceptions to Electronegativity

Are there any exceptions to the electronegativity periodic trend?
by Alvaro Chumpitaz 4D
Sat Dec 07, 2019 5:53 pm
Forum: Sigma & Pi Bonds
Topic: Sigma Bonds
Replies: 2
Views: 95

Sigma Bonds

Which are stronger sigma or pi bonds?
by Alvaro Chumpitaz 4D
Sat Dec 07, 2019 5:52 pm
Forum: Octet Exceptions
Topic: Boron
Replies: 1
Views: 103

Boron

Why does boron not form an octet? Why does it prefer only 3 bonds?
by Alvaro Chumpitaz 4D
Sun Dec 01, 2019 3:39 pm
Forum: Trends in The Periodic Table
Topic: Nitrogen
Replies: 7
Views: 151

Nitrogen

Why does nitrogen disrupt the electron affinity trend?
by Alvaro Chumpitaz 4D
Sun Dec 01, 2019 3:39 pm
Forum: Trends in The Periodic Table
Topic: Exceptions to Electroaffinity
Replies: 3
Views: 135

Exceptions to Electroaffinity

Are there any exceptions to the electron affinity periodic trend?
by Alvaro Chumpitaz 4D
Sun Dec 01, 2019 3:34 pm
Forum: Hybridization
Topic: Hybridization of Hydrogen
Replies: 3
Views: 51

Hybridization of Hydrogen

What would be the hybridized state of hydrogen? Sometimes I see its hybridized as 1s and thats it Is that possible?
by Alvaro Chumpitaz 4D
Sun Dec 01, 2019 3:32 pm
Forum: Industrial Examples
Topic: What do we need to know?
Replies: 15
Views: 314

Re: What do we need to know?

Drake Choi_1I wrote:What is one biological example of coordination compounds?

I think we need to know vitamin b12 and hemoglobin and myoglobin
by Alvaro Chumpitaz 4D
Sun Dec 01, 2019 3:32 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 5
Views: 95

Cisplatin

Hi can someone explain what we needs to know about cisplatin for the final?
by Alvaro Chumpitaz 4D
Sun Dec 01, 2019 3:29 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Oxoacids and Carboxylic Acids
Replies: 1
Views: 36

Oxoacids and Carboxylic Acids

Which is a stronger acid? In general
by Alvaro Chumpitaz 4D
Sun Dec 01, 2019 3:26 pm
Forum: Student Social/Study Group
Topic: Final Topics
Replies: 4
Views: 74

Final Topics

Do we need to know molecular spectroscopy vs atomic spectroscopy? and if so what is molecular spectroscopy?
by Alvaro Chumpitaz 4D
Sun Dec 01, 2019 3:25 pm
Forum: Student Social/Study Group
Topic: Final topics
Replies: 10
Views: 116

Re: Final topics

The final is cumulative of everything we have learned this quarter.
by Alvaro Chumpitaz 4D
Sun Dec 01, 2019 3:23 pm
Forum: Amphoteric Compounds
Topic: Amphoteric Compound
Replies: 2
Views: 44

Amphoteric Compound

How do you know when an amphoteric compound is acting like an acid or base?
by Alvaro Chumpitaz 4D
Mon Nov 25, 2019 7:52 pm
Forum: Amphoteric Compounds
Topic: Oxides
Replies: 4
Views: 92

Oxides

How can you tell whether an oxide is acidic, basic or amphoteric without the chemical reaction formula such as in 6A,17?
by Alvaro Chumpitaz 4D
Fri Nov 22, 2019 4:40 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Bidentate
Replies: 2
Views: 49

Bidentate

How can you tell from the shape or chemical formula of a ligand if it will be a monodentate or bidentate or...?
by Alvaro Chumpitaz 4D
Tue Nov 19, 2019 6:55 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 Points
Replies: 7
Views: 62

Boiling Points

Explain the difference in the boiling points of NO2 (21 celsius) and N20 (-88 celsius)
by Alvaro Chumpitaz 4D
Tue Nov 19, 2019 4:01 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Hydrogen Bonding/Pi bonds
Replies: 11
Views: 276

Hydrogen Bonding/Pi bonds

Is there any similarity between hydrogen bonding (important in maintaining shapes of biological molecules) and pi bonds (prohibit rotation of the molecule)?
by Alvaro Chumpitaz 4D
Sun Nov 17, 2019 9:38 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Trend in polarisability and polarizing power?
Replies: 3
Views: 127

Trend in polarisability and polarizing power?

Are there any periodic trends for polarisability and polarizing power?
by Alvaro Chumpitaz 4D
Sun Nov 17, 2019 9:35 am
Forum: Bond Lengths & Energies
Topic: Dissociation Energy
Replies: 2
Views: 40

Dissociation Energy

Can someone explain disassociation energy about bond lengths?
by Alvaro Chumpitaz 4D
Sun Nov 17, 2019 9:33 am
Forum: Dipole Moments
Topic: Dipole-Dipole Conti.
Replies: 2
Views: 27

Dipole-Dipole Conti.

Are there dipole-dipole forces on non polar molecules?
by Alvaro Chumpitaz 4D
Sun Nov 17, 2019 9:33 am
Forum: Dipole Moments
Topic: Dipole-Dipole
Replies: 2
Views: 38

Dipole-Dipole

Im still having a bit of trouble on how to identify dipole moments from a chemical formula? How do you know there are dipole-dipole forces?
by Alvaro Chumpitaz 4D
Sun Nov 10, 2019 4:21 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: High Distortion
Replies: 4
Views: 73

High Distortion

In lecture, I always here "high distortion" from highly polarized anions. What does it mean to have high distortion? Like does it have something to do with the electron cloud?
by Alvaro Chumpitaz 4D
Sun Nov 10, 2019 4:19 pm
Forum: Dipole Moments
Topic: Difference between two attractive forces
Replies: 1
Views: 24

Difference between two attractive forces

What is the difference between dipole-dipole and London forces? And how can you tell if a compound has a dipole-dipole force from the chemical formula?
by Alvaro Chumpitaz 4D
Sun Nov 10, 2019 4:18 pm
Forum: Electronegativity
Topic: Electronegativity Exceptions
Replies: 3
Views: 35

Electronegativity Exceptions

Are there any exceptions to the electronegativity trend on the periodic table? And why not(compared to ionization energy)?
by Alvaro Chumpitaz 4D
Sun Nov 10, 2019 4:15 pm
Forum: Bond Lengths & Energies
Topic: London Forces
Replies: 6
Views: 68

London Forces

Do all compounds have Van der Waals forces? And why is that?
by Alvaro Chumpitaz 4D
Sun Nov 10, 2019 4:13 pm
Forum: Dipole Moments
Topic: HYDROGEN BONDING
Replies: 3
Views: 32

HYDROGEN BONDING

Does a coumpound that has N,O, or F with a Hydrogen atom always have to have a hydrogen bond? Is there a way where the conditions for a hydrogen bond are present except the compound or molecule does not form a hydrogen bond?
by Alvaro Chumpitaz 4D
Tue Oct 29, 2019 7:21 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 11
Views: 146

Electronegativity

Okay I honestly do not remember what electronegativity is from high school, so what is it and if there is a trend on the periodic table for it?
by Alvaro Chumpitaz 4D
Tue Oct 29, 2019 7:19 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal change equation
Replies: 3
Views: 45

Formal change equation

Will the equation for formal change be provided on the test or should it be committed to memorization?
by Alvaro Chumpitaz 4D
Tue Oct 29, 2019 7:18 pm
Forum: Octet Exceptions
Topic: List of Octet exceptions
Replies: 6
Views: 113

List of Octet exceptions

Is there a definitive number of elements that will disobey the octet rule?
by Alvaro Chumpitaz 4D
Tue Oct 29, 2019 7:16 pm
Forum: Formal Charge and Oxidation Numbers
Topic: FC Charge and Stability
Replies: 2
Views: 47

FC Charge and Stability

Will there every be a time when the formal charge is not 0 but it is the most stable structure for the atom?
by Alvaro Chumpitaz 4D
Tue Oct 29, 2019 7:15 pm
Forum: Ionic & Covalent Bonds
Topic: Strength of ionic and covalent bonds
Replies: 2
Views: 23

Strength of ionic and covalent bonds

Which bond is generally stronger? Covalent or ionic? Also is a single bond stronger than a double bond?
by Alvaro Chumpitaz 4D
Sat Oct 26, 2019 9:44 pm
Forum: Trends in The Periodic Table
Topic: Question on 2A.23 part a
Replies: 2
Views: 24

Question on 2A.23 part a

On the basis of the expected charges on the monoatomic ions, give the chemical formula for each of the following compounds
a) magnesium arsenide
How can you figure the amount of each element in the formula (aka the subscripts)?
by Alvaro Chumpitaz 4D
Sat Oct 26, 2019 9:40 pm
Forum: Trends in The Periodic Table
Topic: Question on 2A. 17 part c
Replies: 1
Views: 29

Question on 2A. 17 part c

Predict the number of valence electrons present for each of the following ions
c) Co (3+)
How can you predict the number of valence electrons for a transition metal?
by Alvaro Chumpitaz 4D
Sat Oct 26, 2019 9:35 pm
Forum: Trends in The Periodic Table
Topic: Question on 1F.5 b
Replies: 3
Views: 46

Question on 1F.5 b

Which member of each pair is likely to have the smaller first ionization energy?
b) Mg or Na
The answer is Na but I do not necessarily understand why
by Alvaro Chumpitaz 4D
Sat Oct 26, 2019 9:29 pm
Forum: Trends in The Periodic Table
Topic: Period 3 Elements
Replies: 2
Views: 22

Period 3 Elements

Why can some Period 3 elements not follow the octet rule? For example, P, S, Cl
by Alvaro Chumpitaz 4D
Sat Oct 26, 2019 9:28 pm
Forum: Lewis Structures
Topic: Covalent vs Ionic
Replies: 2
Views: 18

Covalent vs Ionic

Which is a stronger bond? Covalent or an ionic bond?
by Alvaro Chumpitaz 4D
Wed Oct 16, 2019 10:17 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Uncertainty application
Replies: 3
Views: 51

Uncertainty application

Is it possible to calculate the uncertainty of a photon? Or does the fact that it lack mass prevent that?
by Alvaro Chumpitaz 4D
Wed Oct 16, 2019 10:10 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: the fourth number?
Replies: 4
Views: 52

Re: the fourth number?

I believe the 4th number is arbitrary as all you have to know is if there are 2 electrons in a box diagram then one is +1/2 and the other is -1/2. And if it is a single electron in the box it is still arbitrary.
by Alvaro Chumpitaz 4D
Wed Oct 16, 2019 10:08 pm
Forum: DeBroglie Equation
Topic: Question on applications of the equation
Replies: 2
Views: 48

Question on applications of the equation

Does the DeBroglie equation only work on electrons or can it also be applied to photons?
by Alvaro Chumpitaz 4D
Wed Oct 16, 2019 10:06 pm
Forum: Photoelectric Effect
Topic: When energy is equal to work function
Replies: 9
Views: 219

When energy is equal to work function

So in the photoelectric effect, what would happen if the energy of the photon is equal to that of the work function (ie no KINETIC ENERGY)?
by Alvaro Chumpitaz 4D
Tue Oct 15, 2019 8:54 am
Forum: Photoelectric Effect
Topic: Question on Topic 1A.15
Replies: 1
Views: 42

Question on Topic 1A.15

IN THE ULTRAVIOLET SPECTRUM OF ATOMIC HYDROGEN, A LINE IS OBSERVED AT 102.6 NM. DETERMINE THE VALUES OF N FOR THE INITIAL AND FINAL ENERGY LEVELS OF THIS ELECTRON DURING THE EMISSION OF ENERGY THAT LEADS TO THIS SPECTRAL LINE. My question is there another way to solve the problem that does not inclu...
by Alvaro Chumpitaz 4D
Wed Oct 09, 2019 8:31 pm
Forum: Photoelectric Effect
Topic: Topic 1A.3
Replies: 2
Views: 39

Topic 1A.3

Which of the following happens when this frequency of electromagnetic radiation decreases? Explain your reasoning? a) The speed of the radiation decreases b) The wavelength of the radiation decreases c) The extent of the change in the electrical field at a given point decreases d) The energy of the ...
by Alvaro Chumpitaz 4D
Tue Oct 08, 2019 8:49 pm
Forum: Properties of Light
Topic: Intensity and the number of photons
Replies: 3
Views: 1086

Intensity and the number of photons

Can someone explain how intensity is proportional to the number of photons? And also if there is a formula that explains this process,
by Alvaro Chumpitaz 4D
Tue Oct 08, 2019 8:47 pm
Forum: Properties of Light
Topic: Rays of the EM Spectrum
Replies: 2
Views: 63

Rays of the EM Spectrum

Which rays in the EM spectrum can cause radiation or cancer? In other words, which ones are harmful to organisms and is dependent on their intensity?
by Alvaro Chumpitaz 4D
Tue Oct 08, 2019 8:44 pm
Forum: Photoelectric Effect
Topic: Kinetic Energy from the Photoelectric Effect
Replies: 5
Views: 67

Kinetic Energy from the Photoelectric Effect

So what happens to the excess energy (kinetic energy) caused by the the removal of the electron?
by Alvaro Chumpitaz 4D
Tue Oct 08, 2019 8:30 pm
Forum: Balancing Chemical Reactions
Topic: Chemical States
Replies: 3
Views: 93

Re: Chemical States

I think you should put the states because if not the equation would be skeletal.
by Alvaro Chumpitaz 4D
Tue Oct 01, 2019 8:50 pm
Forum: Molarity, Solutions, Dilutions
Topic: Question on E27
Replies: 4
Views: 53

Question on E27

A) Calculate the mass, in grams, of one water molecule
Okay so are you supposed to divide 1 water molecule by Avogadro's constant and then multiply by the molar mass to get the grams? If not please tell me what I am doing wrong
by Alvaro Chumpitaz 4D
Tue Oct 01, 2019 7:11 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Question on E17c
Replies: 2
Views: 49

Question on E17c

Which sample in each of the following pairs contains the greater number of moles of atoms?
c) 7.36 x 10^23 atoms of Ru or 7.36 x 10^27 atoms of Fe

So I used Avogadro's constant and I got the same answer for both? I got 1.222 x 10^4 mols of Ru and Fe. I was wondering where I went wrong.
by Alvaro Chumpitaz 4D
Tue Oct 01, 2019 3:17 pm
Forum: Limiting Reactant Calculations
Topic: Another question on E9 but now on part b
Replies: 2
Views: 27

Another question on E9 but now on part b

Epsom salts consist of magnesium sulfate heptahydrate. Write its formula. b)How many formula units of the compound are present in 5.15 grams I am confused on where to start with the problem? Do we find the moles of the compound first and then find the amount of atoms using Avogadro's constant? If no...
by Alvaro Chumpitaz 4D
Tue Oct 01, 2019 3:13 pm
Forum: Limiting Reactant Calculations
Topic: Practice Problem from Online Module
Replies: 2
Views: 67

Re: Practice Problem from Online Module

Okay from what I understand is first you want to understand the ratios of the products and reactants. So for example if you had CaC2 + 2H20--> Ca(OH)2 + C2H2, you can see the formula has a 1:2:1:1 ratio cause of the coefficients in front of them. So if we give the example of 100g of CaC2 divided by ...
by Alvaro Chumpitaz 4D
Tue Oct 01, 2019 2:53 pm
Forum: Limiting Reactant Calculations
Topic: Question on E9
Replies: 4
Views: 51

Question on E9

E.9 Epsom salts consist of magnesium sulfate heptahydrate. Write its formula a) How many atoms of oxygen are in 5.15 grams of Epson salts... Okay so for part A I understand using the 5.15 grams and dividing it by 246.48 of the molar mass of magnesium heptahydrate. What I am confused about is the nex...

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