Archemides essays

Archemides essays Archimedis was born in 287 BC. We also know that Archimedes died in 212 BC at the age of 75 in Syracuse. It is said that a Roman soldier, who was offended by Achimedes, while the Romans seized Syracuse, killed him. Archimedes had a wide variety of interests, which included encompassing, statistics, hydrostatics, optics, astronomy, engineering, geometry, and arithmetic. Archimedes had more stories passed down through history about his clever inventions than his mathematical theorems. Archimedes most famous story is about the king asking a guy to make him a gold crown. The king supplied the guy with the gold and told him to get it done. This guy asked Archimedes to think of some way to test the weight of gold. Archimedes was unsuccessful until one day as he entered a full bath, he noticed that the deeper he went into the tub, the more water flowed out of the tub. This discovery made him realize that the amount of water that flowed out of the tub was equal to the volume of the object be ing put in. Therefore by putting the gold into the water, he could tell by the rise in water level the volume of the gold. ...

Chemical Properties and Physical Properties

Chemical Properties and Physical Properties When you study matter, youll be expected to understand and distinguish between chemical and physical properties. Physical Properties Basically, physical properties are those which you can observe and measure without changing the chemical identity of your sample. Physical properties are used to describe matter and make observations about it. Examples of physical properties include color, shape, position, volume and boiling point. Physical properties may be subdivided into intensive and extensive properties. An intensive property (e.g., color, density, temperature, melting point) is a bulk property that does not depend on the sample size. An extensive property (e.g., mass, shape, volume)Â  is affected by the amount of matter in a sample. Chemical Properties Chemical properties, on the other hand, reveal themselves only when the sample is changed by a chemical reaction. Examples of chemical properties include flammability, reactivity and toxicity. The Gray Area Between Physical and Chemical Properties Would you consider solubility to be a chemical property or a physical property, given that ionic compounds dissociate into new chemical species when dissolved (e.g., salt in water), while covalent compounds do not (e.g., sugar in water)?