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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