Lecture02-Ch02+Life+Chemistry+and+Energy

Lecture02-Ch02+Life+Chemistry+and+Energy - 2 Why is the...

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1 LIFE CHEMISTRY AND ENERGY 2 Why is the search for water important in the search for life? CHAPTER 2 LIFE CHEMISTRY AND ENERGY Key Concepts 2.1 Atomic Structure Is the Basis for Life’s Chemistry 2.2 Atoms Interact and Form Molecules 2.3 Carbohydrates Consist of Sugar Molecules 2.4 Lipids Are Hydrophobic Molecules 2.5 Biochemical Changes Involve Energy
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2 CONCEPT 2.1 ATOMIC STRUCTURE IS THE BASIS FOR LIFE’S CHEMISTRY Living and nonliving matter is composed of atoms. electron proton neutron CONCEPT 2.1 ATOMIC STRUCTURE IS THE BASIS FOR LIFE’S CHEMISTRY Like charges repel; different charges attract. Most atoms are neutral because the number of electrons equals the number of protons. Dalton —mass of one proton or neutron (1.7 × 10 –24 grams) Mass of electrons is so tiny, so it is usually ignored.
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3 CONCEPT 2.1 ATOMIC STRUCTURE IS THE BASIS FOR LIFE’S CHEMISTRY Element —pure substance that contains only one kind of atom Living things are mostly composed of 6 elements: Carbon (C) Hydrogen (H) Nitrogen (N) Oxygen (O) Phosphorus (P) Sulfur (S) CONCEPT 2.1 ATOMIC STRUCTURE IS THE BASIS FOR LIFE’S CHEMISTRY The number of protons identifies an element. Number of protons = atomic number For electrical neutrality, # protons = # electrons. Mass number— total number of protons and neutrons Atomic number? Mass number? What element?
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4 CONCEPT 2.1 ATOMIC STRUCTURE IS THE BASIS FOR LIFE’S CHEMISTRY Behavior of electrons determines whether a chemical bond will form and what shape the bond will have. FIGURE 2.1 ELECTRON SHELLS
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5 CONCEPT 2.1 ATOMIC STRUCTURE IS THE BASIS FOR LIFE’S CHEMISTRY Atoms with unfilled outer shells tend to undergo chemical reactions to fill their outer shells.
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Lecture02-Ch02+Life+Chemistry+and+Energy - 2 Why is the...

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