2015 Science News
The Mole Edition
Mole Day @ TCM
Question: What Is a Mole and Why Are Moles Used?
Answer: A mole is simply a unit of measurement. Units are invented when existing units are inadequate. Chemical reactions often take place at levels where using grams wouldn't make sense, yet using absolute numbers of atoms/molecules/ions would be confusing, too. A mole is the quantity of anything that has the same number of particles found in 12.000 grams of carbon-12. That number of particles is Avogadro's Number, which is roughly 6.02x1023. A mole of carbon atoms is 6.02x1023 carbon atoms. A mole of chemistry teachers is 6.02x1023 chemistry teachers. It's a lot easier to write the word 'mole' than to write '6.02x1023' anytime you want to refer to a large number of things! Basically, that's why this particular unit was invented.
Which Elements do these Moles represent?
Green Silicon Latern
Did you know that glass is made from silicon? Sand is made up of silicon. Sand can be melted at extremely high temperatures to form glass.
Why so Blue?
Cobalt is a chemical element with symbol Co and atomic number 27. Cobalt compounds have been used for centuries to color porcelain, glass, pottery, tile and enamel. In addition to being used as a dye, cobalt is also important to human nutrition as it is an essential part of vitamin B12. Which element does the black and white mole represent?
So many helpful elements
Nitrogen is the most abundant element on Earth. However plants must convert it into a useful form to help them grow. Potassium is also an element that is found in an edible fruit, the banana.