1 AP Chemistry A. Allan Chapter 1 Notes - Chemical Foundations 1.1 Chemistry: An Overview A. Reaction of hydrogen and oxygen 1. Two molecules of hydrogen react with one molecule of oxygen to form two molecules of water 2H2 + O2 ? 2H2O 2. Decomposition of water 2H2O ? 2H2 + O2 B. Problem Solving in Chemistry (and life) 1. Making observations 2. Making a prediction 3. Do experiments to test the prediction 1.2 The Scientific Method A. General Framework 1. Making observations a. Quantitative ( measurement) b. Qualitative (color, phase, shape, etc) 2. Making a prediction 3. Do experiments to test the prediction B. Vocabulary 1. Observation a. Something that is witnessed and can be recorded 2. Theory (Model)