Search found 15 matches

by Abishek 3K
Sat Mar 18, 2017 2:55 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7461
Views: 992755

Re: Post All Chemistry Jokes Here

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by Abishek 3K
Wed Mar 08, 2017 3:30 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7461
Views: 992755

Re: Post All Chemistry Jokes Here

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by Abishek 3K
Sun Feb 19, 2017 7:42 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7461
Views: 992755

Re: Post All Chemistry Jokes Here

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by Abishek 3K
Sun Feb 12, 2017 9:24 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7461
Views: 992755

Re: Post All Chemistry Jokes Here

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by Abishek 3K
Sun Jan 29, 2017 8:51 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Enthalpy
Replies: 1
Views: 324

Re: Enthalpy

Split the equation 2CH4 + 4O2 ---> 2CO2 + 4H2O Hc for 1 mole of CH4 is 890, so for 2 moles its 1780, add a negative sign since its exothermic 2CO + O2 ----> 2CO2 (Reverse reaction is 2CO2 ----> 2CO + O2) For the reverse reaction, Hc is positive and for 2 moles value is 586 Total value = -1780+586 = ...
by Abishek 3K
Sun Jan 22, 2017 3:54 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: How to know which method to use? [ENDORSED]
Replies: 1
Views: 238

Re: How to know which method to use? [ENDORSED]

We can use any method, but generally the question can be solved by one method only (as it might be at a constant pressure or volume)
by Abishek 3K
Mon Jan 16, 2017 12:52 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: When can we assume that temperature is 298K?
Replies: 1
Views: 279

Re: When can we assume that temperature is 298K?

You should use the temperature given, if the question doesnt mention anything then use STP. (Standard Temperature and Pressure)
by Abishek 3K
Fri Dec 02, 2016 10:14 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7461
Views: 992755

Re: Post All Chemistry Jokes Here

Are you made of copper and tellurium? Because you're so CuTe
My girlfriend dumped me the next day
by Abishek 3K
Wed Nov 23, 2016 3:35 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE TABLE
Replies: 1
Views: 293

Re: ICE TABLE

First balance the given equation. This involves three steps, initial, change and final concentration at equilibrium. Initial concentration is given in the question, if there is no value it is taken as 0. Change is given in terms of x, and the reaction is taken to be in the forward direction, with a ...
by Abishek 3K
Mon Nov 14, 2016 1:55 pm
Forum: Naming
Topic: Quiz 3 Prep
Replies: 1
Views: 241

Re: Quiz 3 Prep

While naming compunds you don't look at the starting alphabet of the molecule, but the starting letter of the name of compound. Since NH3 is name as ammine and H20 is named as aqua, arranging it alphabetically, NH3 would come before H20.
by Abishek 3K
Mon Oct 31, 2016 5:46 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configurations Exceptions?
Replies: 3
Views: 1062

Re: Electron Configurations Exceptions?

You always try to have half filled or fully filled configurations so you can always shift electrons between 4s and 3d to do that
by Abishek 3K
Fri Oct 21, 2016 7:47 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Relative size of cations and anions
Replies: 2
Views: 516

Relative size of cations and anions

Why are cations smaller than anions?
by Abishek 3K
Fri Oct 14, 2016 12:43 am
Forum: Trends in The Periodic Table
Topic: Atomic Size in a Group
Replies: 1
Views: 219

Atomic Size in a Group

Why is Gallium smaller than Aluminum?
by Abishek 3K
Thu Oct 06, 2016 4:58 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Nodes and Nodal Planes [ENDORSED]
Replies: 3
Views: 389

Nodes and Nodal Planes [ENDORSED]

How many nodes does a 3s orbital have and why?
by Abishek 3K
Fri Sep 30, 2016 5:07 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Negative Sign for Energy
Replies: 2
Views: 265

Negative Sign for Energy

Bohr's postulates state that energy of the emitted photon is equal to Einital - Efinal. This way the energy is positive, but in an example in the course reader the energy had a negative sign before it?

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