Search found 32 matches

by Ismail 1F
Mon Jun 11, 2018 7:10 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids and bases
Replies: 3
Views: 259

Re: Acids and bases

Strong Acids: HCl,HBr,HI,H2SO4,HClO4,HClO3, HNO3
Strong Bases: LiOH,NaOH,KOH,RbOH,CsOH,Ca(OH)2,Sr(OH)2,Ba(OH)2
These are the strongest acids and bases, which is dependent on the composition.
by Ismail 1F
Mon Jun 11, 2018 7:06 pm
Forum: Ionic & Covalent Bonds
Topic: Test 3 Q7
Replies: 3
Views: 146

Re: Test 3 Q7

It has a greater electronegativity and higher electron density which makes it more ionic.
by Ismail 1F
Mon Jun 11, 2018 7:03 pm
Forum: Hybridization
Topic: Lone pairs and hybridization
Replies: 2
Views: 190

Re: Lone pairs and hybridization

There is a list of all the shapes and arrangements of chemicals, there is a difference between shape and arrangement which depends on the amount of lone pairs attached and atoms in a formula. This list has helped me differentiate between the two: https://www.google.com/search?q=molecular+shapes&...
by Ismail 1F
Mon Jun 11, 2018 7:01 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: T-Shape
Replies: 6
Views: 237

Re: T-Shape

T-shape is made up of two lone pairs and three bonded elements to the central atom. Thus the arrangement would have to be similar to a trigonal pyramidal with two lone pairs, so the angles would be 90 degrees apart for the T-shape with two lone pairs attached.
by Ismail 1F
Mon Jun 11, 2018 6:49 pm
Forum: Hybridization
Topic: Composition
Replies: 2
Views: 189

Re: Composition

Are you asking in regards to the composition of each bond as asked in the Final Practice Exam? In that case you would look at all the components attached to the bond in question to find out what makes up it's composition.
by Ismail 1F
Mon Jun 11, 2018 2:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: orbital vs subshell [ENDORSED]
Replies: 3
Views: 163

Re: orbital vs subshell [ENDORSED]

Orbitals are contained in subshells, they make up the number of electrons in an atom.
by Ismail 1F
Mon Jun 11, 2018 2:07 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: weak acids
Replies: 4
Views: 265

Re: weak acids

I think we need to know the difference between strong and weak acids, and what makes an acid weak.
by Ismail 1F
Mon Jun 11, 2018 2:05 pm
Forum: Bond Lengths & Energies
Topic: antibond? [ENDORSED]
Replies: 2
Views: 170

Re: antibond? [ENDORSED]

An antibond works to weaken the bond between two atoms in order to raise the energy of the molecule as a whole. The density of the electrons builds up outside the bond to create a repulsive force between the atoms to separate them. I don't think we need to know this for the final, but hope it helps!
by Ismail 1F
Sun Jun 10, 2018 1:13 pm
Forum: Ionic & Covalent Bonds
Topic: Finding Bond order
Replies: 2
Views: 144

Re: Finding Bond order

Calculate bond order by dividing the number of bonds between atoms by the total number of bond groups in the molecule after drawing the lewis structure.
by Ismail 1F
Sun Jun 10, 2018 12:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal planar vs Bent
Replies: 1
Views: 155

Re: Trigonal planar vs Bent

The shape for ClO2+ lewis structure is bent considering the placement of the atoms around the central atom. Since, there are unbonded electrons attached to one side of the atom, this creates a trigonal planar arrangement. In this case shape and arrangement are different and both are provided as an a...
by Ismail 1F
Sun Jun 10, 2018 12:48 pm
Forum: Hybridization
Topic: Electron densisty
Replies: 5
Views: 285

Re: Electron densisty

Draw out the lewis structure then count the total regions of high electron density around the central atom. These areas of high intensity include unbonded electrons and bonds.
by Ismail 1F
Wed Jun 06, 2018 12:29 pm
Forum: Hybridization
Topic: The number before the sp
Replies: 3
Views: 150

Re: The number before the sp

With energy levels, make sure to take note which level each orbital is on depending on the location of the element on the periodic table.
by Ismail 1F
Wed Jun 06, 2018 12:03 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 4.95
Replies: 1
Views: 92

Re: 4.95

Well a pi bond forms when there is overlap of p orbitals, would not work with s orbital.
by Ismail 1F
Wed Jun 06, 2018 12:00 pm
Forum: Lewis Acids & Bases
Topic: Weak vs strong acids [ENDORSED]
Replies: 7
Views: 365

Re: Weak vs strong acids [ENDORSED]

Depending on the type of group it has attached, you can tell whether it is acidic or basic, as well as the number of hydrogens a formula has.
by Ismail 1F
Mon May 28, 2018 5:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: shapes
Replies: 3
Views: 149

Re: shapes

The shapes we've looked at in class are linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral.
by Ismail 1F
Mon May 28, 2018 5:09 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular shape of H2O
Replies: 2
Views: 81

Re: Molecular shape of H2O

The form is a tetrahedral but since it has unpaired electrons, it is considered a bent shape.
by Ismail 1F
Mon May 28, 2018 5:07 pm
Forum: Dipole Moments
Topic: London Forces
Replies: 7
Views: 285

Re: London Forces

A natural explanation is the way geckos can climb on upright surfaces. There are fluctuations in charge distributions between neighboring molecules, which don't have to be polar, and their charge fluctuations naturally fall into synch, creating an attractive force.
by Ismail 1F
Sun May 06, 2018 8:27 pm
Forum: SI Units, Unit Conversions
Topic: formula units [ENDORSED]
Replies: 69
Views: 22583

Re: formula units [ENDORSED]

Yes, you can use Avogadro's number to convert to formula units.
by Ismail 1F
Sun May 06, 2018 8:26 pm
Forum: Lewis Structures
Topic: Electron Configuration
Replies: 6
Views: 250

Re: Electron Configuration

The 4s orbitals fill first and have a lower energy than 3d, so the 4s needs to be filled first.
by Ismail 1F
Sun May 06, 2018 8:23 pm
Forum: Ionic & Covalent Bonds
Topic: Atomic and Ionic Radius
Replies: 2
Views: 127

Re: Atomic and Ionic Radius

Atomic radius is the size of its atoms, usually the mean and typical distance from the center of the nucleus to the surrounding cloud of electrons. Ionic radius is the radius of an atom's ion. Ionic radii increase down a group and decrease across a period, whereas its the opposite for the atomic rad...
by Ismail 1F
Sun Apr 29, 2018 9:56 pm
Forum: Quantum Numbers and The H-Atom
Topic: Orientation of Lobes
Replies: 3
Views: 171

Re: Orientation of Lobes

Yes, it pretty much means to find the amount of orbitals in a shape, which depends on the way the shape is oriented on a node (plane).
by Ismail 1F
Sun Apr 29, 2018 9:53 pm
Forum: Quantum Numbers and The H-Atom
Topic: Atomic Radius
Replies: 4
Views: 137

Re: Atomic Radius

The atomic radius of an element depends on its location on the periodic table. In general, the more left you go on a certain period, the atomic radius will increasingly decrease. As you move downwards, the radius will increase in size, as electrons fill in valence shells. Hope that helps!
by Ismail 1F
Sun Apr 29, 2018 9:50 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Using shorthand [Ar] [ENDORSED]
Replies: 5
Views: 121

Re: Using shorthand [Ar] [ENDORSED]

Yes, you can use that for shorthand. Any noble gas will work, as long as it is the closest one.
by Ismail 1F
Sun Apr 22, 2018 10:39 pm
Forum: Properties of Electrons
Topic: Wave Properties: Constructive and Destructive Interference
Replies: 2
Views: 197

Re: Wave Properties: Constructive and Destructive Interference

The significance of amplitude is that it measures the amount of energy a wave carries, so it will determine the intensity of a wave in comparison to other waves with different amplitudes. The higher the amplitude, the greater the intensity of the wave. Hope that helps!
by Ismail 1F
Sun Apr 22, 2018 2:09 pm
Forum: Properties of Light
Topic: Electromagnetic Spectrum [ENDORSED]
Replies: 7
Views: 227

Re: Electromagnetic Spectrum [ENDORSED]

I think we should know the ranges of each spectrum, such as the differences between visible and UV light, but I don't think we need to know the exact numbers for each color of visible light.
by Ismail 1F
Sun Apr 22, 2018 2:03 pm
Forum: Einstein Equation
Topic: E=hv vs E=hf [ENDORSED]
Replies: 4
Views: 1179

Re: E=hv vs E=hf [ENDORSED]

Yes, they are the same formula. Sometimes frequency is written in terms of speed formula.
by Ismail 1F
Sun Apr 15, 2018 3:49 pm
Forum: Properties of Light
Topic: HW 1.23
Replies: 2
Views: 109

Re: HW 1.23

It describes the relationship between electron-Volts(eV) with Joules(J), so this number is needed in order to convert eV to J.
by Ismail 1F
Sun Apr 15, 2018 3:41 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Expirement [ENDORSED]
Replies: 4
Views: 154

Re: Photoelectric Effect Expirement [ENDORSED]

The Photoelectric effect resulted from the results of the photoelectric experiment. The effect is when the electrons were ejected from a metal when the surface of the metal was exposed to ultraviolet radiation (Lavelle et.al, 153). The results were that the UV radiation had to be above a certain thr...
by Ismail 1F
Sun Apr 15, 2018 3:24 pm
Forum: Photoelectric Effect
Topic: What is a vacuum?
Replies: 7
Views: 243

Re: What is a vacuum?

A vacuum is a region of space with nothing in it, so when an experiment is done in a vacuum, all the photons, air, and particles are removed from the region to create a space of nothing but pressure. The photoelectric experiment showed this effect of electrons being "ejected" from the metal.
by Ismail 1F
Sun Apr 08, 2018 8:39 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Electron Configuration
Replies: 1
Views: 159

Electron Configuration

Do we need to know how to find the electron configuration and will it need to be shorthand or not?
by Ismail 1F
Sun Apr 08, 2018 8:22 pm
Forum: Balancing Chemical Reactions
Topic: Memorizing the charges of ions
Replies: 3
Views: 167

Re: Memorizing the charges of ions

There are some indications of what the charges of certain ions are based on their composition or place on the periodic table. Those on the left (metals) are positive going +1,+2,+3 and those on the right (non-metals) are negative. However, I agree that there are some charges that do not adhere to th...
by Ismail 1F
Sun Apr 08, 2018 8:17 pm
Forum: Balancing Chemical Reactions
Topic: Balancing the Equation
Replies: 9
Views: 412

Re: Balancing the Equation

Try to do them step by step. As in working with one element at a time and taking into account how many atoms it has as a reactant and a product.

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