By Cathy Cobb, Monty L. Fetterolf
Realize the joys and fascination of chemistry via hands-on demonstrations
For many, chemistry is perceived as a burdensome affair, weighed down with arithmetic and limited to well-guarded examine amenities. whereas those aspects of chemistry are definitely of paramount significance, laboratories and calculators don't inevitably express the inherent great thing about chemistry or the thrill of chemistry at paintings.
This booklet demanding situations the conception of chemistry as too tough to trouble with and too medical to be any enjoyable. Cathy Cobb and Monty L. Fetterolf, either specialist chemists and skilled educators, introduce readers to the magic, beauty, and, convinced, pleasure of chemistry. From the fascination of fall foliage and fireworks, to the functioning of smoke detectors and pcs, to the basics of digestion (as while stable pizza is going bad!), the authors illustrate the strategies of chemistry by way of daily event, utilizing wide-spread fabrics.
The authors commence with a bang—a colourful bottle rocket assembled from universal items you discover within the garage—and then current the rules of chemistry utilizing loved ones chemical substances and pleasant, nontechnical language. They advisor the reader in the course of the fundamentals of atomic constitution, the character of molecular bonds, and the colourful universe of chemical reactions. utilizing analogy and instance to light up crucial thoughts equivalent to thermodynamics, photochemistry, electrochemistry, and chemical equilibrium, they clarify the whys and wherefores of chemical reactions. Hands-on demonstrations, chosen for his or her ease of execution and relevance, illustrate uncomplicated ideas, and full of life commentaries emphasize the thrill and fascination of studying approximately chemistry.
This pleasant and richly informative e-book amply proves that chemistry can entice our instinct, good judgment, and—if we’re keen to get down and dirty—our experience of pleasure too.
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Additional info for The Joy of Chemistry: The Amazing Science of Familiar Things
This is well mixed and divided into four portions in suitably marked linen bags, some ofwhich are held with the consignment in case of subsequent dispute or arbitration. One 3 kg bag is forwarded to the buyer in order to check the quality. Cup-testing, as has been indicated, is really the most important part of quality control, but a few other parameters should be mentioned. One is INTRODUCTION 37 moisture content, which if too high can indicate incomplete drying of the coffee at origin; this can lead to development of off-flavours of a musty nature if it reaches say 14 or 15 %.
The World CojJee Trade, Woodhead-Faulkner, Cambridge, UK, 1983. , Weltatlasder KajJeelănder, Gordian-Max-Rieck, Hamburg, 1972. Sivetz, M. and Desrosier, N. , 1979. Clifford, M. , Proc. , 1975 (May), 13~16, 19. Vitzthum, O. , in KajJee und CoJJein, Ed. O. Eichler, Springer-Verlag, Berlin, 1975, 3~77. Roberts, H. R. and Barone, J. , 1983, 37(9), 32~9. Von Borstel, R. , 1983, 37(9), 40~3, 46~7. American Council on Science and Health, Health EjJects of CafJeine, ACSH, New York, March 1981. International Herald Tribune, 24 March 1983.
The process of roasting consists of applying considerable heat to the beans, which must be kept in motion to ensure an even roast, until their colour reaches the desired shade of brown, at which stage the coffee is rapidly cooled by an air current with or without the aid of a water spray or 'quench'. Before the advent of mechanical roasters this was a domestic activity involving the use of a frying pan or hand-driven cylinder over an open fire, a time-consuming, smoky process which required some skill to avoid underroasting or scorching.
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