Chapter 2: Science, Matter, Energy, and Systems
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Section 1: What Do Scientists Do?
Concept 2-1: Scientists collect data and develop hypotheses, theories, models, and laws about how nature works. Section 2: What is Matter and What Happens When It Undergoes Change?
Concept 2-2A: Matter consists of elements and compounds, which in turn are made up of atoms, ions, or molecules. Concept 2-2B: Whenever matter undergoes a physical or chemical change, no atoms are created or destroyed (the law of conservation of matter). |
Section 3: What is Energy and What Happens When it Undergoes Change?
Concept 2-3A: Whenever energy is converted from one form to another in a physical or chemical change, no energy is created or destroyed (first law of thermodynamics). Concept 2-3B: Whenever energy is converted from one form to another in a physical or chemical change, we end up with lower-quality or less-usable energy than we started with (second law of thermodynamics). Section 4: What are Systems and How Do They Respond to Change?
Concept 2-4: Systems have inputs, flows, and outputs of matter and energy, and feedback can affect their behavior. |
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