CHM110H5 Chapter 2: 21 Matter consists of chemical elements in pure form and in combinations called compounds
Document Summary
2. 1 matter consists of chemical elements in pure form and in combinations called compounds. Organisms are composed of matter (anything that takes up space and has mass) Matter is made up of elements element is a substance that cannot be broken down to other substances by chem reactions. A compound is a substance consisting of two or more different elements combined in a ratio. Essential elements (elements needed for an organism to live and reproduce): Trace elements are required by an organism in only minute quantities i. e. iron (fe) are needed by all forms of life. Trace elements are required by an organism in only minute quantities i. e. iron (fe) are needed by all forms of life i. e. iodine (i) deficiency diet cause goiter (growth of thyroid gland at an abnormal. Some elements are toxic i. e. arsenic are toxic for humans; linked to diseases and can be lethal. Case study: the evolution of tolerance to toxic elements.
