Chemistry

Vodka can make people do strange things - especially if they also have a phone. But it can also do cool things, like demonstrating how to message people using chemical signals when conventional wireless would fail.

Researchers in the UK have successfully text messaged 'O Canada' using evaporated vodka. 

The chemical signal, using the alcohol found in vodka in this case, was sent four metres across the lab with the aid of a tabletop fan. It was then demodulated by a receiver which measured the rate of change in concentration of the alcohol molecules, picking up whether the concentration was increasing or decreasing.


You can perform simple qualitative analysis to detect certain metals in various substances using borax bead, and flame tests. The inoculating loop for these tests is very easy to make. You can use 20 gauge to 26 gauge Nichrome or platinum wire depending on what is easiest for you to find. To make the loop use a 20cm length of wire and something cylindrical to wrap the wire around such as a small brad or finishing nail. I used an ink cartridge from a disposable ball point pen.


Note: the wire in this photo is oversized to make it easier to see in the photograph.

Wrap the wire around the cylinder to form a loop:

Kudos to Thames and Kosmos for getting their chemistry sets on the shelves at Barnes and Noble. They have these three introductory sets in the store: the “Dangerous Book for Boys Classic Chemistry Science Kit,” “The Chem C500,” and “The Chem c1000.” Sadly, the chemistry set has to compete with the Xbox One and the Play Station 4 so, if there’s any money left over for after Christmas sales you’ll at least have the opportunity to browse the three sets in the store—pick up the box, feel its weight, read the back of the box for the contents and information about the experiments that can be done with these kits. You’ll have time to use your Google-fu to look up reviews for the kits.

Life grew as a result of natural processes that used Earth's raw materials.

Models of life's origins almost always look to minerals for such essential tasks as the synthesis of life's molecular building blocks or the supply of metabolic energy, but this assumes that the mineral species found on Earth today are much the same as they were during Earth's first 550 million years — the Hadean Eon — when life emerged.

A new analysis of Hadean mineralogy
published in American Journal of Science


Edward Snowden: patriot or traitor? Whatever your opinion of Mr. Snowden, he did give us pause to reflect on our Fourth Amendment rights “of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.” When contemplating the problem, one must first answer why the Fourth Amendment was considered so important that it needed to be added to the Bill of Rights.
While driving to my doctor's office to get some persistent Toxicodendron diversilobum (that's poison oak) looked at, I listened to NPR. Just as you would expect of me, my radio stations will all have buttons for NPR, country music, whatever station carries Rush Limbaugh, and a variety of others. On NPR I was intrigued because the guest chef was preparing a meal for alternative Thanksgiving lifestyles, that being vegan and gluten-free.
Some older chemistry sets included a conductivity tester to demonstrate the conductivity of materials and liquids. If you wish to include Snap Circuits in your Science Play and Research Kit you can use a simple circuit designed with the 555 timer IC incorporated into the circuit to test conductivity. For an introduction to the 555 timer IC and snap circuits, please review this article.

Parts Needed:

1 555 Timer IC
2 Clothespins
1 250 ml beaker

Snap Circuits Parts:

You may wish to include a UV LED in your Science Play and Research Kit. Nowadays you can find inexpensive key chain lights that include a visible light LED flashlight, but also include a red laser LED and UV LED. The red laser can be used to demonstrate the Tyndall effect, and the UV LED can be used to demonstrate  a lot of stuff that becomes visible under UV light. I found this black light (UV) LED strobe light on clearance after Halloween for around $2.00 USD:

You can use a laser to demonstrate the Tyndall effect. A simple cat toy (laser pointer) will do but for this demonstration I’ll be using the laser from my DIY Laser Interferometer. “The Tyndall effect, also known as Tyndall scattering,” according to Wikipedia, “is light scattering by particles in a colloid or particles in a fine suspension.” You can use the laser to test three different mixtures: solutions, colloids, and suspensions.

Parts needed:

250 ml beaker

Teaspoon

Eyedropper

Table salt (NaCl)

Milk

Dirt from your garden

Tap water

Solutions

You often see demonstrations of titration using an expensive glass burette, but you can build titration lab ware using a disposable serological pipette, a solder sucker bulb, and a ring stand or support stand. For this build I’m using my erector set support stand (I sometimes call it my Bunsen burner stand). Titration is the process of determining the unknown concentration of a solution by adding a known amount of a solution with a known concentration. For example, in an acid-base titration, you can determine the unknown concentration of an acid in a solution by adding a base solution of known concentration.