1: Introduction to Chemistry
- Page ID
- 24420
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- 1.3: The Scientific Method
- Scientists search for answers to questions and solutions to problems by using a procedure called the scientific method. This procedure consists of making observations, formulating hypotheses, and designing experiments, which in turn lead to additional observations, hypotheses, and experiments in repeated cycles.
- 1.9: Essential Elements for Life
- Of the approximately 115 elements known, only the 19 are absolutely required in the human diet. These elements—called essential elements—are restricted to the first four rows of the periodic table, with only two or three exceptions (molybdenum, iodine, and possibly tin in the fifth row). Some other elements are essential for specific organisms.