Search found 29 matches

by Archana Biju 1G
Thu Dec 06, 2018 5:37 pm
Forum: Lewis Acids & Bases
Topic: BaO a Lewis acid ?
Replies: 3
Views: 104

Re: BaO a Lewis acid ?

Another way to look at it is that since hydroxide ions are formed from the reaction of BaO with water you know that BaO is a basic oxide.
by Archana Biju 1G
Mon Dec 03, 2018 3:59 pm
Forum: Naming
Topic: Latin Names
Replies: 5
Views: 109

Re: Latin Names

One was that was used commonly in the book is ferrate, referring to iron in anions that are negative.
by Archana Biju 1G
Mon Dec 03, 2018 3:42 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ch.17-#31b (6th edition) Coordination Compounds
Replies: 2
Views: 81

Ch.17-#31b (6th edition) Coordination Compounds

Write the formula for the following coordination compound: pentaamminesulfatocobalt(III) chloride.

I got the answer [CoSO4(NH3)5]Cl, but the book provided the answer [Co(NH3)5SO4]Cl. Is there a specific reason for (NH3)5 going before SO4?
by Archana Biju 1G
Wed Nov 28, 2018 10:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 5
Views: 108

Re: Polarity

The bent shape of NO2- makes it a polar molecule. The dipole moments are moving away from the nitrogen in two different directions, so they don't cancel out - making it a polar molecule.
by Archana Biju 1G
Mon Nov 26, 2018 11:09 pm
Forum: Dipole Moments
Topic: Intermolecular Forces
Replies: 1
Views: 76

Intermolecular Forces

Why does CHI3 have a higher melting point than CHF3? Does it have to do with electronegativity?
by Archana Biju 1G
Mon Nov 26, 2018 2:07 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 5
Views: 120

Polarizability

What are the trends we would use to order the anions Cl^-, Br^-, N^3-, and O^2- in order of increasing polarizability?
by Archana Biju 1G
Sun Nov 25, 2018 3:15 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Isoelectronic
Replies: 14
Views: 569

Re: Isoelectronic

Isoelectronic means 2 different elements have the same number of valence electron.
by Archana Biju 1G
Sun Nov 25, 2018 3:12 pm
Forum: Hybridization
Topic: double bonds
Replies: 14
Views: 228

Re: double bonds

A double bond = sigma bond + pi bond
by Archana Biju 1G
Sun Nov 25, 2018 3:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: How to state bond angles.
Replies: 7
Views: 161

Re: How to state bond angles.

You are not expected to know the exact degree of the angle, but you are expected to say less than 109.5 degrees.
by Archana Biju 1G
Fri Nov 16, 2018 4:01 pm
Forum: Dipole Moments
Topic: Bond Lengths
Replies: 5
Views: 196

Re: Bond Lengths

Single bonds are the longest, then double bonds, then triple bonds.
The shortest bonds have the highest energy.
by Archana Biju 1G
Fri Nov 16, 2018 3:56 pm
Forum: Lewis Structures
Topic: Molecule Shape
Replies: 8
Views: 212

Re: Molecule Shape

From the lewis structure we can identify the number of lone pair and bonded electrons and from this we could classify the molecule to a shape.
by Archana Biju 1G
Tue Nov 13, 2018 6:21 pm
Forum: Ionic & Covalent Bonds
Topic: delta positive delta negative
Replies: 15
Views: 384

Re: delta positive delta negative

Usually the anions found on the right side of the periodic table have a delta negative sign - this is because they are usually an electron acceptor. The cations found on the left side of the periodic table have delta positive sign - this is because they are usually electron donors.
by Archana Biju 1G
Sat Nov 10, 2018 3:59 pm
Forum: Properties of Light
Topic: Exam 2 Question 4A
Replies: 6
Views: 309

Re: Exam 2 Question 4A

You have to convert from kilojoules to joules, since the h constants unit is j.s, so that they cancel out when you use the equation e = hv, v = e/h, to get the frequency in the unit s^-1.
by Archana Biju 1G
Tue Nov 06, 2018 5:58 pm
Forum: Electronegativity
Topic: Electronegativity Calculation
Replies: 5
Views: 122

Re: Electronegativity Calculation

You just have to know the trend of electronegativity on the periodic table and also the idea behind it - which is how easily an atom can attract a bonding pair of electrons. Ex: F needs only one more electron to reach a stable state so it's highly electronegative.
by Archana Biju 1G
Tue Nov 06, 2018 5:53 pm
Forum: Octet Exceptions
Topic: Copper ion electron structure
Replies: 3
Views: 128

Re: Copper ion electron structure

Cu's ground state is [Ar]3d104s1 because of the exception, and so for cu^2+ you would take away the last two electrons giving you [Ar]3d9.
by Archana Biju 1G
Thu Nov 01, 2018 11:45 pm
Forum: Electronegativity
Topic: Calculating electronegativity
Replies: 10
Views: 429

Re: Calculating electronegativity

I think you just need to understand the trend - electronegativity increases from left to right and decreases from top to bottom.
by Archana Biju 1G
Thu Nov 01, 2018 11:37 pm
Forum: Resonance Structures
Topic: How to tell when an molecule is resonant?
Replies: 7
Views: 333

Re: How to tell when an molecule is resonant?

You can tell a molecules is resonant if there is more than one lewis structure that works for the molecule - this can be found by moving around the double and triple bonds around the molecule.
by Archana Biju 1G
Wed Oct 31, 2018 6:48 pm
Forum: Ionic & Covalent Bonds
Topic: Valence electrons
Replies: 2
Views: 99

Valence electrons

Could someone explain how Manganese (Mn) has 7 valence electrons?
by Archana Biju 1G
Thu Oct 25, 2018 5:23 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Significance of XYZ to PDF orbitals
Replies: 6
Views: 160

Re: Significance of XYZ to PDF orbitals

Yes, the x,y,z is simply shown to denote the orientation of the orbitals.
by Archana Biju 1G
Wed Oct 24, 2018 6:45 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodal Planes
Replies: 6
Views: 159

Re: Nodal Planes

isarose00 wrote:How do you determine how many subshells there are from an n value, for example if n = 3, how can you determine subshells from this?


Subshells are basically the angular momentum l, and l is n-1. So, for this case l = 2 and the subshells would be 0,1,2.
by Archana Biju 1G
Wed Oct 24, 2018 6:42 pm
Forum: *Shrodinger Equation
Topic: Orbitals, Lobes, e- density
Replies: 3
Views: 294

Re: Orbitals, Lobes, e- density

What exactly is the concept behind lobes?
by Archana Biju 1G
Wed Oct 17, 2018 10:55 pm
Forum: Einstein Equation
Topic: Einstein's Equation: E=hv
Replies: 11
Views: 345

Re: Einstein's Equation: E=hv

H is planks constant - 6.63 x 10^-34 J.s
But this is given to us in the formula sheet, so no worries!
by Archana Biju 1G
Wed Oct 17, 2018 10:39 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra Module Question
Replies: 2
Views: 101

Re: Atomic Spectra Module Question

In order to solve this problem I found it easier to use the formula:
frequency = -R[1/n^2 - 1/N^2]
= 1.14 x 10^14 = -3.29 x 10^15[1/n^2 - 1/16]
= 1/n^2 = .0278
= ~6
by Archana Biju 1G
Wed Oct 17, 2018 10:25 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Atomic Spectra
Replies: 4
Views: 94

Atomic Spectra

Can someone explain why the transition from n = 4 to n = 2 emits radiation of longer wavelength than the transition from n = 5 to n = 1?
Thank you!
by Archana Biju 1G
Fri Oct 12, 2018 12:44 am
Forum: Einstein Equation
Topic: Units for v(frequency)
Replies: 11
Views: 179

Re: Units for v(frequency)

Hz and s^-1 can be used interchangeably but I think s^-1 is best when used in equations and Hz is best to state your final answer.
by Archana Biju 1G
Wed Oct 10, 2018 11:51 pm
Forum: Properties of Light
Topic: Light
Replies: 9
Views: 170

Re: Light

Amplitude and frequency are related in that they are inversely proportional to one another.

So, if the amplitude increases, the frequency decreases, or if the amplitude decreases, the frequency increases. This relationship is derived from the equation v = c/(lamda).
by Archana Biju 1G
Sun Oct 07, 2018 3:03 pm
Forum: SI Units, Unit Conversions
Topic: Fundamental E3
Replies: 6
Views: 185

Re: Fundamental E3

So for this problem you would start out with the information they gave you, which the 9 atoms of Gallium. You would have to first convert the 9 atoms of Ga to grams. So, (9 atoms Ga)(1 mol Ga/ 6.022 x 10^23 atoms of Ga)(70 g Ga/1 mol Ga) = 1.046 x 10^-21 grams of Ga Then you would use the grams of G...
by Archana Biju 1G
Wed Oct 03, 2018 10:55 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Calculating the number of atoms
Replies: 5
Views: 98

Re: Calculating the number of atoms

To go from mass to atoms, you would have to first convert the mass to moles. So, let's say you have 5 grams of O2 and if you convert that to moles it would be ~32 grams in 1 mole of oxygen. Then you would convert the moles to atoms using avargado's number - 6.022 x 10^23 atoms. So, if you do that wi...
by Archana Biju 1G
Wed Oct 03, 2018 10:45 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass
Replies: 5
Views: 272

Re: Molar Mass

Since you are converting O2 and not just oxygen, you would have to multiply the atomic mass of oxygen (15.99) by two to get the molar was for O2. The same goes for F2 too.

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