Search found 19 matches

by Ruohan Sun 3I
Sat Dec 09, 2017 9:00 pm
Forum: Sigma & Pi Bonds
Topic: delocalized pi bond
Replies: 5
Views: 898

delocalized pi bond

how do you know if a bond is delocalized?
by Ruohan Sun 3I
Sat Dec 09, 2017 8:57 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: #33 on Practice test
Replies: 1
Views: 251

Re: #33 on Practice test

if the system is compressed, the concentration of gas will increase, which means there is more product, so more reactant will form
by Ruohan Sun 3I
Sun Dec 03, 2017 11:33 pm
Forum: Amphoteric Compounds
Topic: 12.17 Part c and Part d
Replies: 1
Views: 162

Re: 12.17 Part c and Part d

Because they both have the characteristics of acids and bases. You can easily find these compounds around the diagonal of the periodic table.
by Ruohan Sun 3I
Sun Dec 03, 2017 11:06 pm
Forum: Bronsted Acids & Bases
Topic: Is H+ a Bronsted acid?
Replies: 1
Views: 127

Is H+ a Bronsted acid?

Is H+ a Bronsted acid?
by Ruohan Sun 3I
Sun Nov 26, 2017 7:39 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: CO3 2-
Replies: 1
Views: 153

CO3 2-

How can CO3 2- be monodentate or bidentate?
by Ruohan Sun 3I
Sun Nov 26, 2017 7:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: problem11.23
Replies: 2
Views: 131

problem11.23

At 500.K, the equilibrium constant for the reaction Cl2(g)+Br2(g)=2BrCl(g) is Kc=0.031. If the equilibrium composition is 0.495 mol/L Cl2 and 0.145 mol/L BrCl, what is the equilibrium concentration of Br2?

What does 500.K mean? And how does that affect the result?
by Ruohan Sun 3I
Sun Nov 19, 2017 11:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: seesaw shape
Replies: 1
Views: 168

seesaw shape

shouldn't the two bonds on the axis be bent because of the repulsion of the lone pair?
by Ruohan Sun 3I
Sun Nov 19, 2017 10:49 pm
Forum: Sigma & Pi Bonds
Topic: double bonds
Replies: 5
Views: 394

double bonds

why do double bonds contain one sigma bond and one pi bond?
by Ruohan Sun 3I
Sun Nov 12, 2017 9:58 pm
Forum: Lewis Structures
Topic: atomic structure of HOCO
Replies: 8
Views: 325

Re: atomic structure of HOCO

I think that's because oxygen has higher ionization energy.
by Ruohan Sun 3I
Sun Nov 12, 2017 9:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Bipyramidal with 1 lone pair and 4 bonds
Replies: 3
Views: 176

Re: Trigonal Bipyramidal with 1 lone pair and 4 bonds

Because on the equatorial plane the lone pair only has 2 bonds which are 90° from it, but if it is on the axis it will have 3. So the lone pair repels less bonds on the equatorial plane.
by Ruohan Sun 3I
Sun Nov 05, 2017 6:12 pm
Forum: Trends in The Periodic Table
Topic: electron affinities
Replies: 2
Views: 165

electron affinities

what are the electron affinities of group IIA elements and noble gases?
by Ruohan Sun 3I
Sun Nov 05, 2017 4:28 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: trigonal pyramidal
Replies: 3
Views: 153

trigonal pyramidal

is it that when there are three bonds and a lone pair on the central atom it forms trigonal pyramidal structure?
by Ruohan Sun 3I
Sun Oct 29, 2017 5:15 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 4s and 3d orbitals
Replies: 5
Views: 367

4s and 3d orbitals

Since 4s orbitals are filled by electrons before 3d orbitals, why are electrons lost from 4s orbitals first?
by Ruohan Sun 3I
Sun Oct 29, 2017 4:56 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodes
Replies: 4
Views: 298

Re: Nodes

A nodal plane is also called a angular node. The number of nodal planes (angular nodes) is l, and by subtracting the number of nodes (n−1) by the number of nodal planes you can get the number of radial nodes (nodal surfaces), which is n−l−1
by Ruohan Sun 3I
Sun Oct 22, 2017 11:41 pm
Forum: *Shrodinger Equation
Topic: Double derivative [ENDORSED]
Replies: 3
Views: 263

Double derivative [ENDORSED]

What does double derivative mean?
by Ruohan Sun 3I
Sun Oct 15, 2017 9:11 pm
Forum: Properties of Light
Topic: Planck's Constant
Replies: 10
Views: 450

Re: Planck's Constant

when using the equations E=hν and λ=h/p
by Ruohan Sun 3I
Sun Oct 15, 2017 8:59 pm
Forum: Properties of Electrons
Topic: Speed/Energy of Electrons
Replies: 4
Views: 233

Re: Speed/Energy of Electrons

The speed of electron ejected is related to its kinetic energy, which is the energy of photon subtracted by the threshold energy. It's not related to the speed of light. You can use the speed of light to calculate the frequency and energy of photons.
by Ruohan Sun 3I
Sat Oct 07, 2017 4:34 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molarity unit [ENDORSED]
Replies: 11
Views: 752

Re: Molarity unit [ENDORSED]

The mostly used unit M is mol/L, but you can also use other units such as mol/mL
by Ruohan Sun 3I
Sat Oct 07, 2017 4:15 pm
Forum: Balancing Chemical Reactions
Topic: Net Moles Produced [ENDORSED]
Replies: 5
Views: 477

Re: Net Moles Produced [ENDORSED]

just subtract the coefficients of products by the coefficients of reactants

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