General Chemistry 1C. Lecture 8. Acids and Bases. Pt. 5.
General Chemistry (Chem 1C) is part of OpenChem: http://learn.uci.edu/openchem. Recorded on April 17, 2013. This video lecture is part of a 10-week undergrad...
By: UCIrvineOCW
Visit link:
General Chemistry 1C. Lecture 8. Acids and Bases. Pt. 5. - Video
A couple of days ago I travelled to Duisburg in Germany to attend the grand opening of Shimadzu‘s Laboratory World. This refurbishment project, which involved the remodelling of their existing facilities into state-of-the art labs and seminar space, has taken several months to complete and marks the 45th anniversary of the establishment of Shimadzu Europe.
Shimadzu representatives at opening of Laboratory World
The event was attended among others by Akira Nakamoto, President of Shimadzu Corporation, and Kiyoshi Koinuma, Japanese Consul General. Besides the usual formalities (ie speeches, cutting the ribbon, tour of the facilities, etc) we were treated to a cask-breaking Japanese ceremony (pictured) called kagamiwari.
During kagamiwari, our hosts - wearing brightly coloured Happi jackets – broke open a beautiful sealed barrel filled with sake. They then shared it with all guests after serving in square wooden cups known as masu. [Drinking from a square cup is not easy so here's a tip: take sips from the corner of the cup]
To coincide with the opening there were a couple of European product launches (Tracera and Nexera), and I was very interested to hear the latest about LABNIRS, a project in the growing field of brain science. This technology measures brain function using near infrared spectroscopy (NIRS) rather than recording electrical activity. More specifically, NIRS measures the changes in concentration between oxidised and deoxidised haemoglobin in the brain. Therefore, when brain activity occurs, this causes a temporal increase in blood pressure, which in turn increases blood circulation resulting in a higher consumption of oxygen and affecting the oxidised/deoxidised haemoglobin ratios.
Shimadzu have been working with the makers of ASIMO, the robot developed by Honda, in informatics research and brain-machine interfacing. Because LABNIRS permits real time NIRS and electroencephalogram measurements and data transfer it is now possible to characterise the brain function of a human while visualising manual actions and then translate these into appropriate signals for robot movement, thus allowing control of the robot’s actions using human thought. The future is here.
Bibiana Campos-Seijo
Source:
http://prospect.rsc.org/blogs/cw/2013/04/18/shimadzu-trip/
This week’s compound is so bitter (a thousand times more so than quinine) that it’s used to stop people drinking alcohol. Discover denatonium benzoate - the bitterest compound in the world – in this week’s Chemistry in its element podcast.
Source:
http://prospect.rsc.org/blogs/cw/2013/04/18/chemistry-in-its-elements-denatonium-benzoate/
Chemistry: Neutralization (MinutePhysics)
A little info on neutralization and some that can be seen in real life. Did you know that Aqua Regia is one of the only things that can react and dissolve GO...
By: JaHuProductions
Go here to read the rest:
Chemistry: Neutralization (MinutePhysics) - Video
Acid Catalyzed Hydration of Alkenes Made Easy! Part 1/2 Organic Chemistry Addition Reactions
This video is a basic introduction into the Acid Catalyzed Hydration Reaction and how a pattern that you can use for Product Prediction questions. BUT there ...
By: Frank Wong
Excerpt from:
Acid Catalyzed Hydration of Alkenes Made Easy! Part 1/2 Organic Chemistry Addition Reactions - Video
The game is afoot! UK charity Crimestoppers is enlisting the help of the Great British public to sniff out cannabis farms. To aid the public in their undercover work they’ve been handing out scratch and sniff panels. These give people an idea of what living, growing cannabis smells like – Crimestoppers describes it as a sickly, sweet smell as opposed to the more acrid aroma when it’s smoked (we at Chemistry World are relying on testimony from local a Cambridge councillor here!).
Tests indicate that fresh cannabis has an aroma like freshly cut vegetation and grass with a slightly sickly sweet undertone!
Crimestoppers is warning that cannabis cultivation is a growing trend in the UK with the number of farms uncovered in 2012 up 15% on the previous year. The charity is working with the police to try to tackle the increase in residential farms, where people often grow the plants hydroponically in attics using heat lamps and high intensity lighting. The police has said that cannabis cultivation is fuelling organised crime, while the UK’s energy regulator says that the cost of electricity stolen by these farms may be costing the economy as much as £400 million each year.
Lucy Reid, campaign manager at Crimestoppers, says the idea came from the Dutch police. They ran a similar campaign and as a result there was a 45% rise in cannabis farms sniffed out in Amsterdam. She points out that the scratch and sniff panel doesn’t contain any tetrahydrocannabinol (THC) – the psychoactive compound in cannabis and also the inspiration for a number of pharmaceutical drugs to treat illnesses such as multiple sclerosis.
The scratch and sniff card set us at CW Towers to thinking about how they were able to recreate the smell of fresh cannabis. To try to find out I spoke with JanCees Neef at the Edge Factory in the Netherlands, whose company produce the scratch and sniff cannabis panels. Unfortunately, he’s not able to tell us that much about the production process as it’s a company secret. However, he did tell us that the Dutch police deliver cannabis plants to them and that they quickly process them, to extract an oil from the plants – Neef says that this needs to be done as fast as possible because oil made from wilted plants smells like rotten eggs, giving people a nasty surprise when they scratch and sniff. This cannabis oil is then microencapsulated – Neef won’t say more about the process – and printed onto cards. Neef does say, however, that the microencapsulation technology preserves the smell for a couple of years.
Microencapsulation has its roots in carbonless copy paper, developed back in the 1960s to put an end to the messy carbon papers that turned your hands black. In this case microencapsulated inks were stored in the paper and burst open when the typewriter’s typebars hit the paper. While Edge won’t tell us how they encapsulate their oil, it’s possible to take an educated guess at the type of process used.
There are numerous ways of microencapsulating compounds and most have been developed by the cosmetics industry to deliver their latest wrinkle defying elixir. Scratch and sniff panels often use polymers like polyoxymethylene urea. The oil and polymer are mixed together at high speed to produce droplets of oil 15–20µm in size, suspended in the polymer solution. A catalyst is then added to crosslink the polymers, sealing the oil inside the microcapsules. The microencapsulated oil droplets are then washed to remove leftover polymer and oil, and then processed to form a slurry for printing. Once printed onto a panel, scratching the card bursts some of these microcapsules, releasing whatever smelly compound the manufacturer desires – in Crimestoppers’ case the scent of cannabis plants.
In the office we were also intrigued by which volatiles give fresh cannabis its distinctive smell. Again, this is something Neef couldn’t tell us unfortunately, but there is some information out there. Apparently, cannabis’ smell is the product of more than 100 terpenoids, including eucalyptol, linalool and pinene. What’s also interesting is Reid’s insistence that the scratch and sniff panels don’t contain any THC, but obviously still contain enough of the smelly terpenoids to provide a rough approximation of the odour of growing cannabis. Given that many of the terpenoids volatilise at the same temperatures as THC and that they’re both fat-soluble it’s difficult to immediately see a simple way of processing the oil to exclude THC, while keeping in those aromatic, smelly terpenoids. And my internet searches on the question of THC extraction have been throwing up all the wrong results!
Patrick Walter
Spacechem - Chemistry, In Spaaaccce.
Spacechem is a chemistry themed puzzle game where you #39;program #39; reactors to make them perform chemical reactions to solve problems. The actual game mechanics...
By: Scott Manley
Excerpt from:
Spacechem - Chemistry, In Spaaaccce. - Video
Precipitation Reactions: Crash Course Chemistry #9
A lot of ionic compounds dissolve in water, dissociating into individual ions. But when two ions find each other that form an insoluble compound, they sudden...
By: crashcourse
Read more:
Precipitation Reactions: Crash Course Chemistry #9 - Video
Expert #39;s View on JEE Main 2013 Chemistry Paper
Career Point Video Solutions for JEE Main 2013.
By: careerpoint kota
Go here to see the original:
Expert's View on JEE Main 2013 Chemistry Paper - Video
General Chemistry 1C. Lecture 5. Acids and Bases. Pt. 2.
General Chemistry 1C is part of OpenChem. http://learn.uci.edu/openchem Recorded on April 10, 2013. For more information and access to courses, lectures, and...
By: UCIrvineOCW
Link:
General Chemistry 1C. Lecture 5. Acids and Bases. Pt. 2. - Video
The Role of Chemistry in Medicine
In this episode of the History of Chemistry web series, CHF visitor services assistant Kathy Tusler, describes a case in our museum called "Under the Skin." ...
By: ChemHeritage
See the original post:
The Role of Chemistry in Medicine - Video
In a city frequently battered by the Gulf of Mexico’s windy progeny, one could be forgiven for thinking that a drink called ‘the Hurricane’ might be a bit tasteless. But it is in fact, a very tasty rum-based cocktail, and the classic drink of New Orleans, home of the ACS spring conference 2013.
Philip tests a hurricane cocktail at the ACS New Orleans meeting. For science!
The Hurricane was invented, so the story goes, during the second world war. Whisky supplies were scarce and spirits distributors took advantage of this to shift the more plentiful, but less popular, rum by packaging a hefty order of the spirit with any whisky they sold to bars. Forced to buy large quantities of rum, barman Pat O’Brien began bundling generous helpings of it with lime juice and passion fruit, which went down a storm with the local sailors. Incidentally, the drink is not actually named for those occasional city-levelling ventose visitations, but for the glass in which it is served, which resembles the glass casing of a hurricane lamp, designed to safeguard the kerosene flame against the blustery gusts that might snuff it out.
70 years later, as several thousand chemists beat a path to Bourbon Street, the odds that one of them might get analytical on the city’s cultural icon seem pretty good. And, indeed, the conference boasts a whole session dedicated to booze: ‘Chemistry of the bar’, in which the first order of business was flavour chemist Neil Da Costa’s GC-MS breakdown of the hurricane.
The recipe calls for about 120cm3 rum so, as you might expect, ethanol is fairly dominant. But there are also contributions from the oak barrels in which the rum is aged: some sweet vanillin; guaiacol bringing burnt, smoky flavours; syringaldehyde, lending a floral spiciness; and even a little coconut from coniferyl alcohol. A large limonene and citral spike courtesy of the lime juice freshens up the profile. The modern recipe also includes plenty of the rum precursor and also grenadine, whose role, it turns out, is mostly cosmetic – the tannins it contains giving the hurricane its distinctive red colouring. The whole thing is served over ice, which acts to refresh the consumer and, as Da Costa points out, keeps the delicate fruit juice aldehydes from oxidising to acids.
‘What’s “n” in this experiment?’ Laura wonders
Da Costa’s analysis certainly seems thorough but as dedicated science journalists, we are bound by codes of scientific conduct and our journalistic integrity to determine the facts for ourselves. Thus, Laura and I have put our livers on the line to see if we can duplicate (perhaps even triplicate) the findings. Applying our own sophisticated sensing equipment to the task, we conducted an independent analysis of the hurricane and I’m pleased to confirm that our results are largely in support of Da Costa’s. Our instruments struggled to detect the intricacies of the rum profile amid the citrus and sugar, but there was certainly a large positive response for ethanol.
The Big Easy’s other classic cocktail is the Sazerac – a whisky-based drink carrying what was once the defining element of the cocktail – bitters. These ethanolic infusions of plant roots, bark and so on are packed with terpenes that give aromatic, floral tones. Originally sold as patent medicines, they found their way into drinks in the 19th century, when the Royal Navy added them to gin (creating pink gin). Analytical chemist Arielle Johnson has been taking a closer look at bitters to identify the compounds they contain and the flavours they deliver. Having fallen out of favour for many years, bitters are enjoying a comeback in the craft cocktail market, so Johnson is sharing her work with local barmen and women to develop new recipes. We may soon see the first products in the nascent field of rational cocktail design. Cheers!
Philip Robinson
Source:
http://prospect.rsc.org/blogs/cw/2013/04/11/chemistry-of-a-hurricane/
Kelly Ripa and Michael Strahan #39;s Talk #39;Chemistry #39; During the New York Power List Photo Shoot
Behind the scenes at THR #39;s Live with Kelly Michael photo shoot, former football star Michael Strahan revealed that his favorite interview was with Dolly Pa...
By: The Hollywood Reporter
Read more:
Kelly Ripa and Michael Strahan's Talk 'Chemistry' During the New York Power List Photo Shoot - Video
I bet many of you have used this ingredient of bath salts in your undergraduate chemistry labs. Discover magnesium sulfate in this week’s Chemistry in its element podcast.
Source:
http://prospect.rsc.org/blogs/cw/2013/04/10/chemistry-in-its-element-magnesium-sulfate/
Mission controllers at Nasa’s Jet Propulsion Laboratory (JPL) have turned off some of their instruments for a few weeks and have sent many of their staff on holiday. Communications between Earth and their spacecraft on Mars will diminish during this period.
But do not fear, this is not an extraordinary event. It happens every two years, lasts for about two weeks and is due to a solar conjunction. To explain it in a few words, it means that Earth and Mars are at opposite sides of the Sun, which is obscuring the two planets and is thus preventing regular communication between us and the red planet. It is an interesting phenomenon and, if you are curious, you can watch this video and find out how it affects the work at Nasa.
In any case, this is the fifth solar conjunction for Mars Exploration Rover Opportunity since its arrival in 2004 and will be the first one for Curiosity.
You would think that with so many Nasa staff on holiday we would hear less about the explorations on the red planet. And you would be so wrong… In fact, taking advantage of the enforced break, institutions worldwide have invited those working on the rovers to give public lectures about their work so there will be plenty of talks about Mars in the coming weeks.
© NASA/JPL-Caltech
At the RSC we couldn’t let this opportunity go by and will be hosting not one but two events with two different speakers from Nasa to discuss the adventures of Curiosity.
The first of the two talks will be hosted by the Northern Ireland Assembly’s All-Party Group on Science and Technology, in conjunction with Matrix, and will feature a presentation by Nagin Cox, formerly Deputy Head of Engineering for Nasa’s Mars Curiosity Rover. This will be on Monday 15 April from 3.30pm to 5.00pm, in the Senate Chamber, Parliament Buildings, Stormont, Belfast. If you live near and want to attend you can register here.
The second event, named Where the streets have no name, will be in London on Thursday 18 April at 6.30pm and will be streamed live online so anyone can watch from anywhere in the world! Mars rovers’ driver Paolo Bellutta, who also works at Nasa JPL, will talk about his work, and driving Curiosity and other rovers on Mars.
The Chair for the evening will be Quentin Cooper, presenter of BBC Radio 4’s Material World, and he’ll be taking questions via @RSC_Comms and #RSCpubliclecture.
Also, don’t forget you can follow Curiosity and Opportunity via twitter at @MarsCuriosity and @MarsRovers. The planets will soon move away from the conjunction and you will once again be able to receive first-hand information on the latest mission to Mars!
Chiara Ceci
Source:
http://prospect.rsc.org/blogs/cw/2013/04/10/driving-on-mars-where-the-streets-have-no-name/
Have you ever wondered what it’d be like to come and work for us here at Chemistry World towers? If the thought has ever crossed your mind (or not, it doesn’t offend us if it hasn’t!) this could be your lucky day. We are currently advertising a couple of vacancies not to be missed. Whether you are new to the field of science communication, want to test whether this is the right career for you or you are an experienced journalist we’ve got something for everyone… Read on.
Business editor: We’re looking for an exceptional journalist, familiar with the chemical and pharmaceutical industry, to temporarily manage the business news section and regular business features.
For more info and to apply click here.
Science writer internship: The RSC is looking for a student member to work as a science writer in our editorial office this summer. You will gain experience working for two of our publications: Chemistry World and Education in Chemistry. This eight week position is supported by the Marriott Bequest Trust and will provide a hands-on introduction to the complete editorial process.
For more info and to apply click here. I recommend you also read Patrick’s blog here.
We’re looking for bright, ambitious people who are passionate about Chemistry World and communicating science. If that’s you, get in touch. Follow the links or, if you need more information, contact us at chemistryworld@rsc.org.
Bibiana Campos Seijo
Source:
http://prospect.rsc.org/blogs/cw/2013/04/09/want-to-work-for-chemistry-world/
Govert Flinck, Portrait of Dirck Jacobsz. Leeuw and elemental distribution images of the painting.
While X-ray fluorescence (XRF) spectroscopy is a well-established technique for the investigation of paintings, the apparatus used are usually custom built and not widely available. Now, Matthias Alfeld and colleagues have developed a portable macro XRF spectrometer to look at paintings in situ.
The team used the device to look at a portrait by Govert Flinck, a Dutch painter who was a protégé of the great Rembrandt. Interestingly, they found that originally the subject was painted wearing a broad bobbin lace collar and long lace cuffs but this was toned down for the final version, possibly because it was too trendy.
The device also made it possible to visualise Flinck’s first sketches on the canvas before he got to work with the paint. The authenticity of this particular painting was never disputed but being able to see sketches is a good indication of whether a painting is an original or a copy.
Which paintings would you like to look at with the device? I wonder how many fake Van Goghs could be uncovered?
Jennifer Newton
Source:
http://prospect.rsc.org/blogs/cw/2013/04/10/broad-bobbin-collar-too-fashionable/
IIT-JEE (Mains) - 2013 Solutions Set #39;P #39; Q. No. 35 (Chemistry)
IIT-JEE (Mains) - 2013 Solutions By Impulse Learning In Association with Gupta Tutorials and Fluids Multimedia.
By: Sundeep Gupta
Follow this link:
IIT-JEE (Mains) - 2013 Solutions Set 'P' Q. No. 35 (Chemistry) - Video
One of the stories published in the April issue of Chemistry World started a wider conversation about the value, or otherwise, of explosions in chemistry outreach. Do we over rely on flashes and bangs or do chemistry bangs beget engagement?
Copyright M-H Jeeves
The original article, titled On Ilkley Moor bar TNT, appeared on The Last Retort and started with quite a controversial opening paragraph: ’In my opinion, any chemical lecture is greatly enhanced by an explosion.’
This seemed to divide opinion among readers and you can read about the discussion that ensued on Storify or by following #chemexplosions on Twitter….
What’s your view?
Bibiana Campos Seijo
Source:
http://prospect.rsc.org/blogs/cw/2013/04/08/chemexplosions/
JEE Main 2013, 7 April, Set S, Chemistry, Q 65
In this channel, view IIT JEE 2013 solutions (JEE Main) in addition to previous year IIT JEE solutions, AIEEE solutions, BITSAT solutions and video solutions...
By: EmbibeJEE
View original post here:
JEE Main 2013, 7 April, Set S, Chemistry, Q 65 - Video