BIOL 1201 Chapter : Bio 1201 Ch 2
Document Summary
*note: weight is how strongly the mass is pulled by gravity. Mass is amount of matter in an object: element: substance that cannot be broken down to other substances by chemical reactions. Ex: gold copper carbon oxygen: compound: substance consisting of tow or more different elements combined in a fixed ratio. Ex: table salt: sodium chloride: nacl: out of the 92 natural elements, 20-25% are essential elements that an organism needs to live a healthy life and reproduce. 25, plants 17: oxygen, carbon, hydrogen, and nitrogen make up 96% of living matter. Calcium, phosphorus, potassium, sulfur, etc account for most of the remaining 4%. quantities. Ex: iron: trace elements are required by an organism in only minute, an element"s properties depend on the structure of its atoms, atom: smallest unit of matter that still retains the properties on an element. Measured in daltons, in honor of john dalton who helped develop the atomic theory in 1800.
