Group Of Chemists

17/01/2017

In India, plastic disposal has become a real issue, as it causes massive pollution, does not decompose, and infrastructures are insufficient to process it all. The result: undischarged waste ends up harming people and the planet.
A professor from Madurai, named the
"Plastic Man," found the perfect way to solve this issue: he uses plastic waste from landfills and mixes it with heated bitumen to build eco-friendly roads.
Would you like to see more plastic roads all over the world?
Share this article to raise awareness!

14/08/2016

Sir William Ramsay and Lord Rayleigh announced the
discovery of the first noble gas On This Day in 1894. The first noble gas to be discovered was argon,
named after the Greek word ‘argos’ (meaning
‘lazy’) because it was completely unreactive. For
this work, Sir William Ramsey was awarded the Nobel
Prize in Chemistry and Lord Rayleigh the Nobel Prize in
Physics in 1904 rsc.li/2baF8Uh

21/07/2016

This got me cracking CHEMISTS

04/06/2016

Hilarious Maths

02/06/2016

I need answer pls

14/03/2016

Celebrating Albert Einstein's 137th birthday! The Nobel Prize-awarded physicist is behind the
theory of general relativity, one of the two pillars of
modern physics alongside quantum mechanics. What other historical scientific accomplishments is Einstein known for? Check out our Nobelprize.org Q&A: http://goo.gl/ gcTClM Photo: Albert Einstein (14 March 1879 – 18 April 1955),
University of Berlin, 1920. Source: ETH-Bibliothek
Zürich, Bildarchiv / Hs_0304-1151-003 / Public Domain / Photographer unknown. — with Albert Einstein

05/01/2016

Four elements are soon to be added to the periodic
table, finally completing the seventh row making
every science textbook out of date according to
education giant Pearson, the CNBC has reported. A spokesman for Pearson said, “We regularly
review our course materials and textbooks to ensure
they are up to date, and any changes that need to be
made will be done at the appropriate moment to
ensure least disruption to schools and students.” The International Union of Pure and Applied Chemistry
on December 30, verified the addition of the elements
113, 115, 117 and 118 to the table’s seventh row
making it complete. This marks the first time new atoms have been added
to the periodic table since 2011, according to the
report. Professor Jan Reedijk, President of the Inorganic
Chemistry Division of IUPAC said the chemistry
community is eager to see its most cherished table
finally being completed down to the seventh row. “The chemistry community is eager to see its most
cherished table finally being completed down to the
seventh row. “IUPAC has now initiated the process of formalizing
names and symbols for these elements temporarily
named as ununtrium, (Uut or element 113),
ununpentium (Uup, element 115), ununseptium (Uus,
element 117), and ununoctium (Uuo, element 118),”
he said in a statement. The proposed names and symbols will be checked by
the Inorganic Chemistry Division of IUPAC for
consistency, translatability into other languages,
possible prior historic use for other cases, etc. New elements can be named after a mythological
concept, a mineral, a place or country, a property or a
scientist. After Divisional acceptance, the names and two-letter
symbols will be presented for public review for five
months, before the highest body of IUPAC, the Council,
will make a final decision on the names of these new
chemical elements and their two-letter symbols and
their introduction into the Periodic Table of the Elements. The statement released by IUPAC also quoted the
President, Dr. Mark C. Cesa, as saying, “As the global
organization that provides objective scientific
expertise and develops the essential tools for the
application and communication of chemical
knowledge for the benefit of humankind, the International Union of Pure and Applied Chemistry is
pleased and honored to make this announcement
concerning elements 113, 115, 117, and 118 and the
completion of the seventh row of the periodic table of
the elements. “we are excited about these new elements, and we
thank the dedicated scientists who discovered them
for their painstaking work, as well the members of
the IUPAC/IUPAP Joint Working Party for completing
their essential and critically important task,” he
added. http://www.punchng.com/chemistry-textbooks-
outdated-as-scientists-discover-four-new-elements/

8941Zovoe Jonathan/Simon Ejembi/Ayodele Oluwagbemi Four elements are soon to be added to the periodic table, finally completing the seventh row making every science textbook out of date according to education giant Pearson, the CNBC has reported. A  spokesman for Pearson said, “We regularly review o…

15/12/2015

ACID – BASE EQUILIBRIUM

Some important facts
Theories of acid – base and concept of
conjugate acid base pair
1. The Lewis theory of acid and base • An acid is an electron pair acceptor –
BCl3
• A base is an electron pair donor -
NH3
2. Arrhenius theory of acid and bases
• Acids are substances which produce hydrogen ions in a solution
• Bases are substances which produce
hydroxyl ions in a solution
Neutralization happens because
hydrogen ions and hydroxide ions react
to produce water. Limitation : can’t explain the reactions
occur in non – aqueous solutions
3. Bronsted Lowry theory (B/L theory
of A/B)
• An acid is a proton (hydrogen ion)
donor. • A base is a proton (hydrogen ion)
acceptor.
Conjugate pair
HA + H2O =H3O+ + A-
• HA is an acid since it donate proton.
• H2O is a base since it accept proton. But these is backward reaction also.
• H3O+ is a acid since it donate proton
-> conjugate acid of the base H2O
• A- is a base since it accept proton ->
conjugate base of the acid HA
Strong acids and weak acids Strong acid
• A strong acid is one which is virtually
100% ionised in solution
Weak acid
• A weak acid is one which doesn't
ionise fully when it is dissolved in water
pH
• pH = -log[H+]
• pH is a measure of the concentration
of hydrogen ions in a solution.
• pH is calculated/ obtained from [H+]. So it is only depend on temperature.
The acid dissociation constant, Ka
Ka = [H+] [A-]/ [HA]
• The lower the value for pKa, the
stronger the acid.
• The higher the value for pKa, the weaker the acid.
The ionic product of water Kw and pKw
2H2O = H3O+ + OH-
Kw = [H+] [OH-]
• Like any other equilibrium constant,
the value of Kw varies with temperature.
pKw = -logKw
• In pure water, [H+] = [OH-]
Strong bases and weak bases
Strong base
• A strong base is something like sodium hydroxide which is fully ionic,
and the compound as being 100% split
up into metal ions and hydroxide ions
in solution.
• Considering the strong bases which
do not completely soluble in water still considered as strong bases since the
what soluble is completely ionized.
pOH
pKw = pOH + pH
Weak base
• A weak base is one which doesn't convert fully into hydroxide ions in
solution.
Kb = [B:H+][OH-]/B:
Buffer solution
• A buffer solution is one which resists
changes in pH when small quantities of an acid or an alkali are added to it.

15/12/2015

Ten Things you should know about the
great chemist Linus Pauling.
1. The only person to win two
'UNSHARED' Nobel Prizes. Many people
like Marie Curie got two nobel prizes..
But no-one else can have the claim of two UNSHARED NOBEL PRIZES.
2. Of that two nobel prizes, one was for
PEACE and the other for chemistry.
Which means one Nobel Prize for his
'Brain' and the other for his 'GREAT
MIND' which worked for world peace. 3. Time for a funny fact! Pauling in
childhood earned $200 by doing some
extra works in a photographic studio
for his studies in the college .But in
college he spent $150 from that $200
for his new girlfriend!! (Not for studies,but for taking girlfriend to
shows,restauran ts etc. etc. He is a
typical boy and his girfriend typical
girl!!)
4. Pauling was one of the first scientists
in the field of quantum chemistry and a pioneer in the application of
quantum theory to the structure of
molecules.
5. Linus Pauling was much inspired by
the scientists like Langumir during his
school life and at the young age of 30, he got Langumir Prize for his work in
pure science.
6.Pauling was included in a list of the
20 greatest scientists of all time by the
magazine New Scientist , with Albert
Einstein being the only other scientist from the 20th century on the list
7.Linus Pauling wrote a book, 'How to
Live Longer and Feel Better' . Book
advocated the very high intake of
Vitamin C . Certainly Linus Pauling
lived long. He lived 93 years, 5 months and 22 days.
8. The best words said by Pauling
"Satisfaction of one's curiosity is one of
the greatest sources of happiness in
life".
9. Linus Pauling was not a mere chemist. He was much interested in
Physics, Mathematics and in Biology.
10. Pauling was an atheist.
He was also a Pacifist(one who believes
in peace and not on war)
Hit Like if you are impressed by this great chemist of 20th century.
which fact about Linus Pauling
Impressed you most?? 1? 2? 3?
Mention in the comments..

12/12/2015

12/12/2015

Can you solve this?

02/12/2015

Happy New Month to every member of this COMMUNITY wishing you guys a successful month and Merry Christmas and Happy New Year in advance........