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Alkali metals reacting in water

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Why Old Books Smell Good

“Lignin, the stuff that prevents all trees from adopting the weeping habit, is a polymer made up of units that are closely related to vanillin. When made into paper and stored for years, it breaks down and smells good. Which is how divine providence has arranged for secondhand bookstores to smell like good quality vanilla absolute, subliminally stoking a hunger for knowledge in all of us.

—From Luca Turin and Tania Sanchez’s Perfumes: the guide

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Periodic Table Shoes

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Ionization potential trends and explanations of the two noticeable anomalies.

For Boron to be ionized you are removing a high energy 2p electron, which is comparatively simple to removing the lower energy 2s electron in Beryllium.

Nitrogen’s ionization energy is simply the result of removing a 2p electron. However, when Oxygen loses its 2p electron, it loses a paired electron. Paired electrons are slightly less stable (i.e. higher energy), due to their mutual repulsion (this contributes to the ‘pairing energy’). Thus, this higher energy paired 2p electron is more easily removed, giving Oxygen a lower ionization energy than expected.

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Another chemistry cat

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Dubstep Chemist

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Nanotechnology Mirage Effect

UT Dallas scientists recently demonstrated that transparent carbon nanotube sheets, which can have the density of air and the specific strength of steel, can be used to make objects invisible. This invisibility for light oblique to the nanotube sheets is caused by the mirage effect, in which a thermally generated refractive index gradient bends light array from a hidden object.

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world-shaker:

Guys.

It’s a Periodic. Table.

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Pretty sure you've always wanted to see me naked.. Well.. I'm feeling pretty adventurous today so go to datelink5[dot]com (switch [dot] with .) then sign up and find my profile under the username 'lolsummer69'. I hid my face in the pictures. but I want you to guess who I am and then hit me up on Facebook lol. Good luck.

im pretty sure ive seen this message 300 times.

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heyy! im writing a paper on titrations, do you think you could tell me more abput what a titration is, what it does etc because i have nooo clue

hi :)

i'm not exactly brilliant with this, but i'll try to help.

a titration is the experiment you do when you want to find out the concentration of a solution. usually you would use acids and alkalis to do this, and an indicator, perhaps one that changes colour to indicate the endpoint.

i'm not exactly sure what you want to know, but i'll give you the general idea. 

for example, you could set up the titration apparatus and put an alkali of a know concentration into the burette and the acid which you cant to find out its concentration in the flask under it. ofcourse you need to record the volume of the acid you have used.

then you open the tap of the burette and put some indicator with the acid. let the alkali from the burette drip slowly into the flask, until the colour of the solution in the flask changes. close the tap and record how much of the alkali from the burette was used.

the use the equation, 

Moles= concentration x volume

to calculate the moles of alkali you have used

then you need to look at the balanced equation of the experiment, for example,

2NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l)

in that equation, you have used 2 moles of NaOH but only one mole of  H2SO4. 

so the answer you go, you need to now half to get the number of moles of H2SO4 that you have used.

now, since you know the number of moles and the volume of H2SO4,

you can use this equation again to find the concentration of the H2SO4 that you wanted.

moles= concentration X volume

 if you need any more help, or a different type of answer, just ask :D

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this is a good video on how to calculate EMF valueswww(.)youtube(.)com/watch?v=nizjgu_5VrE (take out the brackets)

thanks for that anon!

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Complex ion solutions are coloured because:- ligands split orbitals into two distinct groups of energy levels- when white/ visible light is shone at the compound, the electrons absorb the energy of particular frequencies depending on the energy between the d-orbitals- electrons are the promoted form a lower to higher energy level, (d-d transition)- the colours of light that are not absorbed are transmitted, so the colour we see is complementary to what is absorbed.

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Ecell= E(right hand side) - E(left hand side)

*make the more negative value the left hand side one

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Standard hydrogen half cell

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The Iodine Propanone reaction

The reaction is first order with respect to propanone and hydrogen ions and zero order with respect to iodine.

The overall order of the reaction is two.

Iodine is not involved in the rate determining step (the slowest step) which is why its not included in the rate equation:

rate = k[CH3COCH3][H+]

The hydrogen ions act as catalyst and are regenerated during the reaction.