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Chemical
Last update: Saturday 11th of February 2012
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A chemical substance is any material with a definite chemical composition. For example, a sample of water has the same properties and the same ratio of hydrogen to oxygen whether the sample is isolated from a river or made in a laboratory. A pure substance cannot be separated into other substances by any mechanical process. Typical chemical substances found in the home are water, salt (sodium chloride) and sugar (sucrose). Generally, substances exist as solid, liquid, or gas, and may change between these phases of matter with changes in temperature or pressure.
The concept of a chemical substance became firmly established in the late eighteenth century after work by the chemist Joseph Proust on the composition of some pure chemical compounds such as basic copper carbonate. He deduced that: "All samples of a compound have the same composition; that is, all samples have the same proportions, by mass, of the elements present in the compound". This became known as the law of constant composition, and it is one of the foundations of modern chemistry.
You should think about pressure washing your home once every other month to avoid the dirt build up and to keep your home looking beautiful on the outside. Pressure washers are ideal for cleaning rooftops, walls and driveways. The force of the spraying water is such that you may not have to use any chemicals at all.
t's beyond obvious that the guys in My Chemical Romance have come a long way since the days when they were compared to the likes of Thursday and other bands in New Jersey's emo/post-hardcore scene, if their concert at the Anaheim Convention Center on Sunday night was any indicator.
The so-called "fluoride" added to public water systems isn't really fluoride. It's a toxic waste from coal plants or industrial chemical processors known as fluorosilicic acid. "Fluoride" is simply a code name for the chemical.Today's water fluoridation laws are based entirely on junk science and power politics ...
The kids that started the whole pop punk craze have completed their new album and plan on hitting the road as soon as they hire a new guitarist to replace Dave “Brownsound” Baksh. I hate the pop punk genre, but somehow I can listen to these guys without throwing up. Can’t say that about My Chemical […]
Can it be? Could this beloved beverage of geeks everywhere contain a chemical this nasty?