1. what is one of the oldest tricks in a chemist's toolbox?
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HOST One of the oldest tricks in the chemist's toolbox is called the flame test. He now puts a different substance into the flame. It burns red.
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['Shaping up with everyday maths. Shapes and space, is the oldest branch of maths. ... ', 'Thinking in numbers. Arithmetic crops up a lot in daily life. ... ', 'Lies, damned lies. Newspapers and TV news are full of statistics. ... ', 'Algebra and equations. A real world example of using algebra is pricing. ... ', 'Fractions, decimals and percentages.']
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Curly Arrows Mechanism. Curly arrows are used by chemists to write reaction mechanisms and understand how a particular chemical reaction works. Curly arrows show the movement of a pair of electrons. The proper use of curly arrows is an essential skill to master as it will help you understand how a reaction proceed.
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['1 carbon.', '4 hydrogen.', '2 nitrogen.', '1 oxygen.']
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In 1858, John Mason invented a glass container with a screw-on thread molded into its top and a lid with a rubber seal. Wire-clamped jars such as Lightning and Atlas jars were in use from the late 19th century until 1964, and still, turn up in yard sales and thrift shops.
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Separatory funnels, or separation funnels, are a common fixture in chemistry labs. These funnels are used to separate immiscible liquids from their solutes. The funnel is usually glass, pear-shaped, and usually includes a stopper and a stopcock.
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The vast majority of the atoms in your body are quite old. The hydrogen is almost all about 13.7 billion years old (formed in the Big Bang) although some small percentage may be formed from minor causes like spallation of protons (out of other nuclei) by cosmic rays, etc.
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['A melting temperature (Tm) in the range of 50 C to 65 C.', 'Absence of dimerization capability.', 'Absence of significant hairpin formation (>3 bp)', 'Lack of secondary priming sites.', "Low to moderate specific binding at the 3' end (avoid high GC content to prevent mispriming)"]
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['fingernail (hardness = 2.5)', 'copper penny (hardness = 3)', 'glass plate or steel knife (hardness = 5.5)', 'steel file (hardness = 6.5)']
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The development of the modern scientific method was slow and arduous, but an early scientific method for chemistry began emerging among early Muslim chemists, beginning with the 9th-century chemist Jābir ibn Hayyān (known as "Geber" in Europe), who is sometimes regarded as "the father of chemistry".
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A geographer's tools include maps, globes, and data that can be displayed in a variety of ways. The oldest known map is a Babylonian clay tablet created about 2,500 years ago.
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['Socket wrenches.', 'Screwdrivers.', 'Mallet.', 'Longneck funnel.', 'Two old milk jugs.', 'Jack stands or car ramp.', 'Wheel chocks.', 'Brake cleaner.']
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['Pliers.', 'Screwdrivers and nut drivers.', 'Wire strippers.', 'Fishing tools.', 'Measuring devices.', 'Labeling machines.', 'Power drills and drivers, hammer/drills.', 'Power saws.']
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Among the oldest methods of preservation are drying, refrigeration, and fermentation. Modern methods include canning, pasteurization, freezing, irradiation, and the addition of chemicals.
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Which tool can be used to measure the volume of a liquid to one decimal place? a beaker.
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Friedrich Wöhler made chemical history in 1828 when he became the first person to synthesize an organic compound from inorganic starting materials—he serendipitously prepared urea, H2NC(O)NH2, from silver cyanate and ammonium chloride.
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Alcohol and mercury were the liquids most commonly used. Thermoscopes were the earliest types of thermometers and they only showed changes in temperature but didn't show numerical values.