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Showing posts from February 5, 2014

Make Your Own Yogurt

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Most chemistry projects are not edible. However, there is a great deal of chemistry in the food we eat. For example, beer, wine, cheese, and yogurt all require chemical reactions to turn one edible product into another. Making yogurt is a great project for all age groups, plus it's easy to work into lessons about proteins, pH, and fermentation. Even if you don't care about chemistry, it's worthwhile to learn to make your own yogurt. It's easy to do and results in a healthy, natural food that contains a lot of nutrients and probiotics

Ice on Fire Chemistry Demonstration

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Set real water ice on real fire by applying a simple chemical reaction. Okay, really the fire is burning between the ice cubes, but the effect makes it look like the ice itself is on fire... here's what to do.

Grow Glowing Crystals

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It's as easy to grow glowing crystals as it is normal crystals. You have a few options: Add glowing craft paint or glue to the crystal solution. The crystals may or may not incorporate the chemical into their matrix, but when you pull the crystals out of the solution, some of the glowing chemical will remain on the exterior, causing your crystals to glow. Make regular clear crystals appear to glow by growing them on a glowing base or substrate. For example, you can make a glowing crystal geode by painting the inside of an eggshell or plaster mold with glowing paint and growing clear or pale-colored crystals inside the glowing base. Make crystals that glow when exposed to black light by mixing yellow highlighter ink into the crystal growing solution. These crystals will glow under ultraviolet (black) light. Also, regular glowing crystals will glow more brightly under black light. Some natural crystals glow under ultraviolet light, without adding any chemicals.

Hemagglutinin and Food Poisoning from Beans

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Here's a fun fact: Eating soaked raw or undercooked beans can result in food poisoning. The culprit is a plant lectin known as phytohaemagglutinin or simply hemagglutinin, a chemical known to cause agglutination of mammalian red blood cells and to disrupt cellular metabolism. According to the US Food and Drug Administration, phytohaemagglutinin is found in many types of beans, but red kidney beans contain the highest levels of hemagglutinin. White kidney beans contain a third as much toxin while broad varieties of beans contain 10% as much hemagglutinin as red kidney beans. This is still plenty, since you only need to eat 4-5 undercooked red kidney beans to get sick. Bean Poisoning Symptoms Symptoms start to appear within 1 to 3 hours after consuming the beans and include nausea and vomiting followed by diarrhea and, in some cases, abdominal pain. Although the symptoms may be severe enough to warrant hospitalization, they resolve spontaneously within a few hours....

This Day in Science History - February 5 - Indiana Pi Law

On February 5, 1897, the Indiana General Assembly voted unanimously to pass a bill set the value of π equal to 3.2. The bill actually dealt with issues behind an old geometrical puzzle involving squaring a circle. Is it possible to create a square with the same area as a circle in finite steps using only a compass and straightedge. An Indiana amateur mathematician named Edwin Goodwin believed he had discovered the elusive solution to this problem. He approached his state representative, Taylor Record with an idea that would gain him recognition for his achievement, and help his home state out in the process. Record introduced bill.

Top 10 Tips To Pass a Chemistry Test

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How do you pass a chemistry test? Of course, the most important step is to study for the test! Yet, way you took the test. Chemistry tests usually a mixed bag of memorization, understanding the concepts, and working problems. It can greatly help your grade to go into the test with a test-taking strategy... Here's what you do you may have studied for a test, felt like you were going to ace it, and then gotten a big fat "F" on the returned exam. Okay, maybe it was just a "C" or a "D", but my point is: you didn't do as well as you thought you would. Do you know why? It likely had to do with the