Search found 50 matches

by Kelsey Ash 1D
Mon Dec 02, 2019 1:35 pm
Forum: Identifying Acidic & Basic Salts
Topic: Relative Acidity
Replies: 2
Views: 48

Re: Relative Acidity

Because strong acids have weaker bonds. Weak bonds usually indicate greater instability since they can easily be broken which explains why the stronger the acid the greater the dissociation of the acid in water to make the acid more stable by losing the hydrogen bond to form an anion.
by Kelsey Ash 1D
Mon Dec 02, 2019 1:31 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH of acids
Replies: 13
Views: 629

Re: pH of acids

A substance becomes more acidic as the pH decreases therefore the lower the pH the stronger the acid. The higher the pH the more basic the substance is therefore a substance with a higher pH will have be a weaker acid.
by Kelsey Ash 1D
Mon Dec 02, 2019 1:27 pm
Forum: Amphoteric Compounds
Topic: amphiprotic and amphoteric
Replies: 9
Views: 133

Re: amphiprotic and amphoteric

If an atom is said to be amphiprotic then that means that the atom has the ability to donate or accept protons whereas amphoteric is the ability of an atom to act as an acid or base.
by Kelsey Ash 1D
Mon Dec 02, 2019 1:24 pm
Forum: Conjugate Acids & Bases
Topic: Ligands
Replies: 12
Views: 116

Re: Ligands

A ligand is an ion or molecule that binds to a central atom to form a coordination compound by donating a pair of electrons to the acid.
by Kelsey Ash 1D
Mon Dec 02, 2019 1:22 pm
Forum: Conjugate Acids & Bases
Topic: Definition
Replies: 7
Views: 103

Re: Definition

Conjugate acid = A chemical compound formed by the reception of a proton by a base. It is a base with a hydrogen ion added to it.
Conjugate base = The species that is formed when an acid dissociates into its ions in water, it loses a hydrogen ion.
by Kelsey Ash 1D
Mon Nov 25, 2019 1:25 pm
Forum: Biological Examples
Topic: Cisplatin
Replies: 17
Views: 366

Re: Cisplatin

It is a type of chemotherapy which stops cell division in an attempt to keep the cancerous cells from spreading. Unfortunately it also affects normal healthy cells' ability to multiply.
by Kelsey Ash 1D
Mon Nov 25, 2019 1:23 pm
Forum: Naming
Topic: Di-, Tri-, Tetra- vs Bis-, Tris-, Tetrakis-
Replies: 11
Views: 149

Re: Di-, Tri-, Tetra- vs Bis-, Tris-, Tetrakis-

You would use them if the ligand already had a prefix of di-, tr-, etc.
by Kelsey Ash 1D
Mon Nov 25, 2019 1:22 pm
Forum: Hybridization
Topic: Hybridization number
Replies: 3
Views: 50

Re: Hybridization number

Yes because atom hybridization can be determined based on electron density surrounded the central atom (lone pairs and bonds attached to central atom). You find the hybridization number by simply counting the number lone pair regions and bonded pairs attached to the central atom.
by Kelsey Ash 1D
Mon Nov 25, 2019 1:19 pm
Forum: Hybridization
Topic: When does hybridization occur?
Replies: 7
Views: 69

Re: When does hybridization occur?

Hybridization occurs when an atom needs to form more bonds than it would normally form in its ground state
by Kelsey Ash 1D
Mon Nov 25, 2019 1:16 pm
Forum: Hybridization
Topic: sigma or pi?
Replies: 20
Views: 281

Re: sigma or pi?

Since sigma bonds always form first if there is a single bond then it is a sigma bond, if there is a double bond then there is one single bond and one pi bond present, and if there is a triple bond then there is still only 1 sigma bond but 2 pi bonds.
by Kelsey Ash 1D
Mon Nov 18, 2019 12:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE notation
Replies: 10
Views: 114

Re: AXE notation

The AXE notation helps you determine molecular shape but it is important to note that just because molecules have the same formula have the same general shape but their bond angles may differ slightly
by Kelsey Ash 1D
Mon Nov 18, 2019 12:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 3
Views: 41

Re: Molecular Shape

Yes that's right. Electron density affects molecular shape but you only refer to the electron which directly surround the atom itself
by Kelsey Ash 1D
Mon Nov 18, 2019 12:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR notation
Replies: 6
Views: 97

Re: VSEPR notation

That's right
by Kelsey Ash 1D
Mon Nov 18, 2019 12:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR, Molecular Geometry, and Molecular Shape
Replies: 4
Views: 86

Re: VSEPR, Molecular Geometry, and Molecular Shape

There is no difference. A VSEPR Model is just a way to show molecular geometry and shape
by Kelsey Ash 1D
Mon Nov 18, 2019 12:02 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Why is SF4 Polar?
Replies: 6
Views: 68

Re: Why is SF4 Polar?

Since there is a seesaw shape the shape of the molecule is not symmetrical so the energies don't cancel making it polar
by Kelsey Ash 1D
Mon Nov 11, 2019 3:48 pm
Forum: Dipole Moments
Topic: Van Der Waals Interaction
Replies: 2
Views: 42

Van Der Waals Interaction

What is a Van Der Waals interaction and how is it different from a dipole moment? Or is it the same thing?
by Kelsey Ash 1D
Mon Nov 11, 2019 3:46 pm
Forum: Bond Lengths & Energies
Topic: Shorter bond lengths
Replies: 12
Views: 118

Re: Shorter bond lengths

More bonds lead to shorter bond lengths because shorter bonds are stronger because the force of attraction with more electrons involved is stronger.
by Kelsey Ash 1D
Mon Nov 11, 2019 3:43 pm
Forum: Dipole Moments
Topic: Dipole Moment
Replies: 6
Views: 63

Re: Dipole Moment

You know there is a dipole moment when there is an unequal sharing of electrons among atoms. The arrow always points in the direction in which the electron os being pulled.
by Kelsey Ash 1D
Mon Nov 11, 2019 3:40 pm
Forum: Dipole Moments
Topic: Dissociation Energies
Replies: 3
Views: 34

Re: Dissociation Energies

Dissociation energies are always positive because it always requires energy to break a bond
by Kelsey Ash 1D
Mon Nov 11, 2019 3:39 pm
Forum: Dipole Moments
Topic: Dipole Moments
Replies: 6
Views: 49

Re: Dipole Moments

A dipole moment is when a molecule has a positive charge next to an equal but opposite negative charge.
by Kelsey Ash 1D
Mon Nov 04, 2019 11:42 am
Forum: Electronegativity
Topic: Difference
Replies: 5
Views: 68

Re: Difference

Electronegativity is how tightly the electrons are held together and polarizability is how easy/difficult it is to lose an electron.
by Kelsey Ash 1D
Mon Nov 04, 2019 11:40 am
Forum: Formal Charge and Oxidation Numbers
Topic: formal charge
Replies: 5
Views: 80

Re: formal charge

You need to solve for formal charge if the question is asking for the electron configuration with the lowest energy. I thought in class today Lavelle said that he wanted us to always show the configuration with the lowest energy so I would just solve accordingly every time.
by Kelsey Ash 1D
Mon Nov 04, 2019 11:37 am
Forum: Ionic & Covalent Bonds
Topic: Electron Configuration
Replies: 7
Views: 88

Re: Electron Configuration

Yes because you always want to show the most stable structure and half filled shells are more stable.
by Kelsey Ash 1D
Mon Nov 04, 2019 11:34 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: HW Question 1A.15
Replies: 1
Views: 47

HW Question 1A.15

Whenever I solve this equation out am getting the the energy of the photon is 1.936x10^-18 J but there is apparently this whole answer is supposed to be negative. Could someone please explain why this is; where does the negative sign come from?
by Kelsey Ash 1D
Mon Nov 04, 2019 11:31 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: N initial and N final
Replies: 1
Views: 49

N initial and N final

When trying to find energy level n initial or n final I know you use the equation delta E=(-hR/nf^2)-(-hR/ni^2) but when ever I try to isolate out the variable I am looking for I am off by 1 negative sign every time and I don't know what I am doing wrong. Could someone please show the work for this ...
by Kelsey Ash 1D
Mon Oct 28, 2019 2:34 pm
Forum: Ionic & Covalent Bonds
Topic: Ground State
Replies: 11
Views: 137

Re: Ground State

The ground state energy of an atom is when the atom is in it lowest energy state in which orbital subshells are paired before the electrons can move up to a higher orbital.
by Kelsey Ash 1D
Mon Oct 28, 2019 2:28 pm
Forum: Sigma & Pi Bonds
Topic: Single vs. Double bonds
Replies: 15
Views: 216

Re: Single vs. Double bonds

Double bonds are stronger and pull the atoms closer together which makes them shorter
by Kelsey Ash 1D
Mon Oct 28, 2019 2:26 pm
Forum: Octet Exceptions
Topic: expanded octet?
Replies: 9
Views: 116

Re: expanded octet?

Elements that haven't filled their d-orbital can have an expanded octet.
by Kelsey Ash 1D
Mon Oct 28, 2019 2:24 pm
Forum: Resonance Structures
Topic: Resonance vs. Resonance Hybrid
Replies: 2
Views: 52

Resonance vs. Resonance Hybrid

Is there a difference between resonance and resonance hybrid structures and if so what is it because I have been getting confused as to when I need to put the double headed arrow between the different molecules.
by Kelsey Ash 1D
Mon Oct 28, 2019 2:19 pm
Forum: Electronegativity
Topic: Calculating Electronegativity
Replies: 3
Views: 53

Calculating Electronegativity

How do you calculate electronegativity?
by Kelsey Ash 1D
Mon Oct 21, 2019 12:16 pm
Forum: Trends in The Periodic Table
Topic: 1st and 2nd Ionization
Replies: 5
Views: 61

1st and 2nd Ionization

What is the difference between 1st ionization energy and second ionization energy?
by Kelsey Ash 1D
Mon Oct 21, 2019 12:14 pm
Forum: Trends in The Periodic Table
Topic: Isoelectronic Atoms
Replies: 6
Views: 123

Isoelectronic Atoms

When explaining isoelectronic atoms in class today he kept mentioning the electrons in terms of OF electrons. What are OF electrons?
by Kelsey Ash 1D
Mon Oct 21, 2019 12:09 pm
Forum: Trends in The Periodic Table
Topic: Ionization Energy
Replies: 8
Views: 108

Re: Ionization Energy

Electrons repel each other so the more electrons you have the greater the repulsion you have from the nuclear. By that logic, if you start to remove electrons the attractive forces between the surrounding electrons and the nucleus increases because there are less forces which repel the electrons. Th...
by Kelsey Ash 1D
Mon Oct 21, 2019 12:03 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radius
Replies: 7
Views: 122

Re: Atomic Radius

Atomic radius is the is half the distance between the centers of 2 neighboring atoms. Atomic radius decreases as you go across the periodic table from left to right and increases as you go down the periodic table.
by Kelsey Ash 1D
Mon Oct 21, 2019 12:01 pm
Forum: Trends in The Periodic Table
Topic: Difference between electron affinity and electronegativity?
Replies: 3
Views: 35

Re: Difference between electron affinity and electronegativity?

Electron affinity is the amount of energy released when electrons are added to a gas phase atom and electronegativity is the tendency of an atom to attract a shared pair of electrons towards itself.
by Kelsey Ash 1D
Mon Oct 14, 2019 8:37 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 43
Views: 4496

Re: E=hv

E is supposed to represent the energy of a photon
by Kelsey Ash 1D
Mon Oct 14, 2019 8:36 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron configuration order
Replies: 4
Views: 71

Re: Electron configuration order

I think it just cuts out the middle ground and jumps to the next orbital so you are supposed to assume that the previous orbital is filled in order for the element to be in that position.
by Kelsey Ash 1D
Mon Oct 14, 2019 8:30 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radius
Replies: 16
Views: 285

Re: Atomic Radius

The radius isn't measured in the excited state. It's only measured in the ground state.
by Kelsey Ash 1D
Mon Oct 14, 2019 8:29 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Radii
Replies: 2
Views: 34

Radii

What is the difference between ionic and atomic radius?
by Kelsey Ash 1D
Mon Oct 14, 2019 8:26 pm
Forum: Ionic & Covalent Bonds
Topic: Bonds
Replies: 4
Views: 156

Bonds

What type of atoms prefer ionic bonds and what type of atoms prefer covalent bonds?
by Kelsey Ash 1D
Tue Oct 08, 2019 11:40 pm
Forum: Balancing Chemical Reactions
Topic: Subscripts [ENDORSED]
Replies: 3
Views: 101

Subscripts [ENDORSED]

When balancing chemical equations you can only add/change the coefficient right? You can't change the subscript number? Because I've noticed a few differences in the solutions manual from the textbook and I don't know if there is just a misprint in 1 of the 2 books or if there is a rule that I am un...
by Kelsey Ash 1D
Tue Oct 08, 2019 11:35 pm
Forum: Empirical & Molecular Formulas
Topic: empirical to molecular formula [ENDORSED]
Replies: 9
Views: 392

Re: empirical to molecular formula [ENDORSED]

You divide the given molar mass (the mass of the molecular formula) by the molar mass of the empirical formula. Whatever the product of that equation is is the number you multiply the empirical formula by.
by Kelsey Ash 1D
Tue Oct 08, 2019 11:29 pm
Forum: Empirical & Molecular Formulas
Topic: Formula Units
Replies: 10
Views: 168

Re: Formula Units

Formula units can be an atom, compound, or a molecule. So basically you just have to use Avogadro's number to solve the equation.
by Kelsey Ash 1D
Tue Oct 08, 2019 11:25 pm
Forum: SI Units, Unit Conversions
Topic: Problem G.23
Replies: 3
Views: 92

Problem G.23

For problem G.23 in the homework do you have to add the moles together of Cl in order to calculate the molarity of the element?
by Kelsey Ash 1D
Tue Oct 08, 2019 11:17 pm
Forum: Trends in The Periodic Table
Topic: Chemistry Community
Replies: 4
Views: 85

Chemistry Community

Since we have to post on chemistry community 5 times a week for credit does that mean that it's due before discussion each week or by Friday?
by Kelsey Ash 1D
Tue Oct 08, 2019 11:16 pm
Forum: Trends in The Periodic Table
Topic: Chemistry Community
Replies: 8
Views: 148

Chemistry Community

Since we have to post on chemistry community 5 times a week for credit does that mean that it's due before discussion each week or by Friday?
by Kelsey Ash 1D
Thu Oct 03, 2019 8:10 pm
Forum: Balancing Chemical Reactions
Topic: Net Ionic Units
Replies: 2
Views: 68

Net Ionic Units

When finding the net ionic units do polyatomic ions remain connected or do you multiply out the end subscript by the preceding number?
by Kelsey Ash 1D
Thu Oct 03, 2019 9:15 am
Forum: Empirical & Molecular Formulas
Topic: Test Materials
Replies: 13
Views: 227

Test Materials

Does anyone know if we will be given a periodic table for the tests in 14A?
by Kelsey Ash 1D
Thu Oct 03, 2019 9:12 am
Forum: Significant Figures
Topic: Significant Figures
Replies: 10
Views: 311

Significant Figures

What are the rules for significant figures again? It's been a while since I've done this and I cannot remember how to determine the correct number of significant figures for a problem/how it would be written.
by Kelsey Ash 1D
Thu Oct 03, 2019 9:10 am
Forum: SI Units, Unit Conversions
Topic: Finding Molar Mass
Replies: 3
Views: 56

Finding Molar Mass

In an equations such as Part D of question E. 23 where the the molecular equation is shown as Na(subscript)2 CO(subscript) 3 dot 10H(subscript)2O do add or multiplayer;y to the 2 equations to find the total molecular mass because I have tried both ways and seem to be getting a different answer from ...

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