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Transcript
Title: The Chemical Basis of Life 1- Introduction: Your body is an elaborate chemical system. Chemical reactions power all of the body’s activities. At the most basic level, life is about chemicals and how they interact with each other. 2- Matter – Matter is anything that has mass and occupies space Element About 25 elements Compounds An element 1- Also for example water is a liquid at room temperature, whereas both hydrogen and oxygen are gases at room temperature 2 - Some compounds are quite simple others are very complex, the important thing to remember is that a compound is always in a fixed ratio 3- Atoms – the word comes from the Latin word atomos, which means indivisible. An atom is the simplest part of an element that contains all of the properties of the element. It would take 3 million carbon atoms lined next to each other to be the size of the period at the end of this sentence. 4- All elements are composed of smaller sub-atomic parts Protons Neutrons Electrons Atomic Number Isotopes Nucleus Radioactive Isotope
