The story goes like this: if a baby’s heart beats faster than 140 beats per minute, it’s a girl, and if it’s slower, it’s a boy. It’s one of the most repeated pregnancy myths, and unlike a lot of folklore, it makes a claim that can be tested. Researchers have tested it, several times. So, fetal heart rate boy or girl: is there a real link? In the early weeks, which is where most of the careful research has looked, […]
A pinch of white crystals can’t talk. It can tell you, though, roughly how clean it is, and all you need to do is warm it up slowly and watch the exact moment it turns to liquid. The benzoic acid melting point is one of the classic examples chemistry students use to learn this trick: pure benzoic acid melts at about 122 °C, and a contaminated sample gives itself away by melting lower and over a wider span of temperatures. […]
UV radiations and melanin production Humans and chimpanzees had the same ancestor about seven million years ago. The changes occur with the passage of time and each of the species evolved individually; the chimpanzees are, however, less evolved because they lived in their original environment. As our history can be related, it is observed that chimpanzees commonly have white skin which is covered with hair. So, it can be predicted that humans had white skin. The lifestyle of humans and […]
Introduction Acid Mine Drainage (AMD) is a very pressing environmental issue in today’s society; Colorado is particularly impacted by the presence of AMD. AMD impacts watersheds by lowering the pH and reducing the alkalinity of natural waters. Using samples collected at the Captain Jack Superfund Site (an AMD site where the Big Five Tunnel drains into Left Hand Creek) we measured the alkalinity in the drainage from the Big Five Tunnel as well as above and below the confluence […]
Chemical Society Proceedings. Report on Newland’s Law of Octaves. (1866) …Mr. JOHN A. R. NEWLANDS read a paper entitled The Law of Octaves, and the Causes of Numerical Relations among the Atomic Weights. The author claims the discovery of a law according to which the elements analogous in their properties exhibit peculiar relationships, similar to those subsisting in music between a note and its octave. Starting from the atomic weights on Cannizzaro’s system, the author arranges the known elements in […]
Problem Statement Design a drinking water treatment plant to treat 40 million gallons per day. The design includes one conventional surface water treatment plant that complies with current regulations, and two alternative treatment plants that comply with future regulations. The treatment plant is designed to treat water with the characteristics shown in Table 1. A jar test was performed on the raw water, with the results shown in Table 2. For TOC removal, the jar test data was not used […]