Search found 46 matches

by JTijerina_4A
Mon Dec 02, 2019 5:02 pm
Forum: Bronsted Acids & Bases
Topic: Using conjugate bases to determine the strength of acids
Replies: 1
Views: 34

Using conjugate bases to determine the strength of acids

Can you use the presence of the extra oxygen and its electronegativity to explain why CH3COOH is stronger than CH3CHOH, or does it only have to do with the resonance of the double bonded oxygen?
by JTijerina_4A
Mon Dec 02, 2019 3:14 pm
Forum: Properties of Light
Topic: Determining which equation to use
Replies: 3
Views: 133

Determining which equation to use

Does anyone have tricks to determine which equation to use for quantum problems (i.e. involving photons, electrons, or other particles)?
by JTijerina_4A
Mon Dec 02, 2019 3:10 pm
Forum: Significant Figures
Topic: sig figs from problems
Replies: 1
Views: 125

sig figs from problems

Is it a good rule of thumb to go by the number of significant figures in problem?
by JTijerina_4A
Mon Dec 02, 2019 3:08 pm
Forum: Hybridization
Topic: Hybridization structures
Replies: 1
Views: 55

Hybridization structures

Will we ever be expected to draw hybridization structures (i.e. hybridization orbitals)?
by JTijerina_4A
Mon Dec 02, 2019 3:03 pm
Forum: Dipole Moments
Topic: Determining Electronegativity
Replies: 1
Views: 109

Determining Electronegativity

Why does O bonded to N constitute a dipole moment, they don't seem to be significantly far away to have a big difference in electronegativity.
by JTijerina_4A
Mon Dec 02, 2019 2:50 pm
Forum: Lewis Acids & Bases
Topic: Proton accepting versus donating
Replies: 2
Views: 47

Proton accepting versus donating

How do you determine if a molecule is accepting or donating, is this memorization or based on the structure?
by JTijerina_4A
Mon Dec 02, 2019 2:46 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Application of oxidation number
Replies: 3
Views: 136

Application of oxidation number

I know that formal charge is used to find the most stable lewis structure, what is the application of the oxidation number, is it at all related to the lewis structure?
by JTijerina_4A
Mon Dec 02, 2019 2:36 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic
Replies: 3
Views: 141

Isoelectronic

What is the trend for isoelectronic properties?
by JTijerina_4A
Mon Dec 02, 2019 2:34 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Subshell Notation
Replies: 2
Views: 133

Subshell Notation

Should we know how to determine hybridization based on quantum numbers?
by JTijerina_4A
Mon Dec 02, 2019 2:26 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration
Replies: 8
Views: 296

Electron Configuration

When we write electron configurations, do we write 3d, 4s or 4s, 3d?
by JTijerina_4A
Mon Dec 02, 2019 2:24 pm
Forum: Properties of Light
Topic: Visible Light Spectrum
Replies: 3
Views: 115

Visible Light Spectrum

Do we need to know the range of wavelengths for the visible spectrum from memory?
by JTijerina_4A
Mon Dec 02, 2019 2:22 pm
Forum: Einstein Equation
Topic: Work Function
Replies: 1
Views: 137

Work Function

How do I calculate the frequency of a photon given the frequency and value for the work function?
by JTijerina_4A
Mon Dec 02, 2019 2:15 pm
Forum: Properties of Light
Topic: Average wavelength of an atom
Replies: 2
Views: 122

Average wavelength of an atom

What equation should I use to find the average wavelength of an atom given the speed and molar mass?
by JTijerina_4A
Mon Dec 02, 2019 12:32 pm
Forum: Hybridization
Topic: Key aspect of hybridization
Replies: 1
Views: 44

Key aspect of hybridization

What are the most important aspects of orbital hybridization to know? (i.e. how to determine hybridization from shape or electron configuration, etc.)
by JTijerina_4A
Mon Dec 02, 2019 12:26 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: H-atom energy levels
Replies: 1
Views: 103

H-atom energy levels

How should we manipulate the equations on the equation sheet in order to determine what the final energy level of a hydrogen atom? (i.e. how do I derive the equation involving final-initial from the equations on the sheet?)
by JTijerina_4A
Sun Nov 24, 2019 6:19 pm
Forum: Naming
Topic: Importance
Replies: 1
Views: 36

Importance

What is the relative importance of being able to derive the formula for a compound based on the name?
by JTijerina_4A
Sun Nov 24, 2019 5:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Representing larger molecules
Replies: 4
Views: 151

Representing larger molecules

How should we draw Lewis structures/determine molecular shape for molecules that have more than one central atom?
by JTijerina_4A
Sun Nov 24, 2019 5:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Important aspects of Radicals
Replies: 1
Views: 33

Important aspects of Radicals

What are the most important things to know about radicals?
by JTijerina_4A
Sun Nov 24, 2019 5:48 pm
Forum: Hybridization
Topic: Describing a molecule using hybridization
Replies: 4
Views: 38

Describing a molecule using hybridization

When asked to describe the hybridization of a molecule, how should we format it? By labeling the steric number on the atoms, or listing the hybridization possible?
by JTijerina_4A
Sun Nov 17, 2019 12:54 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar Molecules and Symmetry
Replies: 3
Views: 47

Re: Polar Molecules and Symmetry

A molecule is polar when the regions of electron density do not cancel (i.e. if they are not symmetrical).
by JTijerina_4A
Sun Nov 17, 2019 12:50 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Polarity
Replies: 3
Views: 32

Re: Determining Polarity

It is important to look at the atoms in the molecule with large differences in electronegativity, in combination with the shape, this will tell you the polarity of the molecule.
by JTijerina_4A
Sun Nov 17, 2019 12:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR
Replies: 6
Views: 75

Re: VSEPR

In order to determine shape, VSEPR tells us to examine the number of regions with high electron density (double bonds, lone pairs etc.). We then place those regions of high electron density as far as physically possible in three dimensions and this dictates the shape.
by JTijerina_4A
Sun Nov 17, 2019 12:42 pm
Forum: Lewis Structures
Topic: Carbon Monoxide
Replies: 4
Views: 54

Re: Carbon Monoxide

Remember that for atoms before the 3d block, fulfilling the octet rule is the first priority before checking formal charge and altering for the most stable form.
by JTijerina_4A
Sun Nov 17, 2019 12:38 pm
Forum: Dipole Moments
Topic: Dipole moments in trigonal bipyramidal shaped molecules
Replies: 4
Views: 83

Re: Dipole moments in trigonal bipyramidal shaped molecules

In addition to shape it is also important to note which atoms compose the molecule and their respective electronegativities.
by JTijerina_4A
Sun Nov 17, 2019 12:31 pm
Forum: Dipole Moments
Topic: Dipole-Dipole
Replies: 2
Views: 57

Re: Dipole-Dipole

The dipole-dipole moments are weaker because there is less pull between the partially charged molecules.
by JTijerina_4A
Sun Nov 10, 2019 10:17 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radius
Replies: 11
Views: 237

Re: Atomic Radius

Atomic radius increases down the row because there are more electron orbitals and shielding leads to less effective nuclear charge, therefore the size of the atom is greater. Atomic radius decreases across the row from left to right because there is a larger number of protons that increases effectiv...
by JTijerina_4A
Sun Nov 10, 2019 10:09 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 5
Views: 50

Re: Electronegativity

The closer the number of valence electrons to having a full octet, the more electronegative the atom will be.
by JTijerina_4A
Sun Nov 10, 2019 10:06 pm
Forum: Resonance Structures
Topic: Drawing Resonance Structures
Replies: 3
Views: 57

Re: Drawing Resonance Structures

When you are asked to draw resonance structures, determine the most stable structure by filling octets, determining the formal charge, then drawing all the possible versions of this particular structure (i.e. if there is a double bond on one atom of which there is multiple, draw that same molecule w...
by JTijerina_4A
Sun Nov 10, 2019 9:43 pm
Forum: Dipole Moments
Topic: London Interaction
Replies: 4
Views: 41

Re: London Interaction

Most, if not all, molecules have London Dispersion forces because they are caused by momentary interactions from electrons.
by JTijerina_4A
Sun Nov 10, 2019 9:38 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: The exceptions
Replies: 6
Views: 213

Re: The exceptions

It's helpful to remember that when dealing with elements that may be exceptions, fill the orbitals according to n instead of according to energy levels. For example, when filling copper, fill the 4s orbital before 3d.
by JTijerina_4A
Sun Nov 03, 2019 4:09 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy of Group 16
Replies: 3
Views: 40

Re: Ionization Energy of Group 16

The general trend for ionization energy is that it increases as you move from left to right and decreases as you move from top to bottom. So elements in group 16 will have a higher ionization energy compared to elements on their left.
by JTijerina_4A
Sun Nov 03, 2019 4:04 pm
Forum: Lewis Structures
Topic: Steps to Drawing a Lewis Structure
Replies: 6
Views: 60

Re: Steps to Drawing a Lewis Structure

First you should count the valence electrons of each atom and sum them together so you have an idea of how many electrons you will be working with in your diagram. Be sure to add or subtract electrons if you are dealing with an ion. Then you should determine which atom can form the most bonds and us...
by JTijerina_4A
Sun Nov 03, 2019 3:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1.E.5 Part D
Replies: 2
Views: 41

Re: 1.E.5 Part D

Effective nuclear charge decreases as you move away from the nucleus because the orbitals shield the pull of the nucleus. Therefore the p orbital will have less effective nuclear charge than the s orbital.
by JTijerina_4A
Sun Nov 03, 2019 3:44 pm
Forum: Ionic & Covalent Bonds
Topic: middle atom
Replies: 13
Views: 101

Re: middle atom

Many times the central atom will be the atom that can form the most bonds based on the number of valence electrons it has.
by JTijerina_4A
Sun Nov 03, 2019 3:42 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 9
Views: 106

Re: Electronegativity

It may be helpful to think about the number of bonds that an atom can form and use the atom that forms the most number of bonds at the center of the lewis structure.
by JTijerina_4A
Sun Oct 20, 2019 5:23 pm
Forum: Quantum Numbers and The H-Atom
Topic: Orbitals
Replies: 4
Views: 60

Re: Orbitals

This is somewhat accurate. The farther away the electron is to the nucleus (i.e. in a further/higher energy orbital) the less pull there is on the electron and the easier it is to remove that electron.
by JTijerina_4A
Sun Oct 20, 2019 5:21 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Atomic orbitals
Replies: 5
Views: 78

Re: Atomic orbitals

The probability of electron density is simply the probability of finding an electron in a certain location (i.e. a particular orbital). It is described as a probability because we can never be certain of an electrons position at any given time. What you are referring to is the probability of an elec...
by JTijerina_4A
Sun Oct 20, 2019 5:17 pm
Forum: Quantum Numbers and The H-Atom
Topic: Wave functions
Replies: 2
Views: 38

Re: Wave functions

I believe Lavelle said that it we wouldn't be given the wave functions because we will not need to use them in the exam. They were explained in order for us to understand the origin of orbitals.
by JTijerina_4A
Sun Oct 20, 2019 5:15 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg's Constant
Replies: 3
Views: 48

Re: Rydberg's Constant

Rydberg's can be derived from the equations given to us. So that we can connect it to what we are learning conceptually, Lavelle wants us to be able to manipulate the given equation rather than memorizing Rydberg's.
by JTijerina_4A
Sun Oct 20, 2019 5:11 pm
Forum: Quantum Numbers and The H-Atom
Topic: Wave Function
Replies: 4
Views: 60

Re: Wave Function

The wave function gives rise to the idea of orbitals. It was given to explain the concept of orbitals but it won't be necessary to know how to solve.
by JTijerina_4A
Sun Oct 13, 2019 6:41 pm
Forum: Balancing Chemical Reactions
Topic: Any Easy Way
Replies: 10
Views: 310

Re: Any Easy Way

I find it very helpful when balancing chemical equations, especially combustion reactions, to make a list and clearly write out the number of elements on each side, then start with the larger compounds (as opposed to O2) when balancing.
by JTijerina_4A
Sun Oct 13, 2019 6:32 pm
Forum: Limiting Reactant Calculations
Topic: About Finding Limiting Reactant
Replies: 7
Views: 275

Re: About Finding Limiting Reactant

You should always convert to moles when looking for the limiting reactant because there is no way to tell from looking at the grams of substance what the limiting reactant is. You also need moles in order to use the mole ratios of the balanced equation to determine what the limiting reactant is and ...
by JTijerina_4A
Sun Oct 13, 2019 6:19 pm
Forum: SI Units, Unit Conversions
Topic: Unit conversion
Replies: 15
Views: 529

Re: Unit conversion

When doing unit conversions it is helpful to think about setting up your fractions so that you are multiplying the given by what you are looking for divided by the conversion factor (the known that has the same units as the given). In the example of the angstrom, multiply the given amount in meters ...
by JTijerina_4A
Sun Oct 13, 2019 6:04 pm
Forum: Properties of Light
Topic: Manipulation of Equations
Replies: 6
Views: 65

Manipulation of Equations

What is the difference between the equation: E=hcλ^-1 and E=h(c/λ). From what I remember about negative exponents these two equations should be the same, but my answer does not match the correct answer.
by JTijerina_4A
Sun Oct 13, 2019 5:59 pm
Forum: Molarity, Solutions, Dilutions
Topic: M1V1=M2V2
Replies: 11
Views: 6563

Re: M1V1=M2V2

You may have to convert to moles in a problem that requires the dilution equation if the question is asking for a particular quantity of moles when given a volume of solution of a certain molarity. It is helpful in these situations to remember that molarity of moles over liters.

Go to advanced search