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MICRO 06 Lect 2 - LECTURES IN MICROBIOLOGY Chemistry of...

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Chemistry of Microbes LECTURES IN MICROBIOLOGY LESSON 2 Sofronio Agustin Professor
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2 Topics Fundamental Building Blocks Macromolecules The Cell
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3 Fundamental Building Blocks Atoms Elements Molecules and compounds
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4 Atoms Subatomic Particles Proton = positive charge Neutron = neutral Electron = negative charge Atomic number = no. of protons Atomic mass = no. of protons and neutrons
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5 Models of Atomic Structure Atomic Structure
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6 Isotopes Atoms with same number of protons but differ in number of neutrons are called isotopes. Example: 12 C, 13 C, and 14 C are isotopes of carbon. Radioisotopes emit radiation in the form of alpha or beta or gamma rays or photons.
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7 Major Elements of Life
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8 Molecules and Compounds Molecule = combination of two or more elements (e.g.H 2 ) Compound = combination of two or more different elements (e.g. H 2 O) Molecules are held together by chemical bonds
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9 Chemical Bonds Covalent Ionic Hydrogen
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10 Chemical Bonds Chemical bonds involve atoms sharing, donating or accepting electrons
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11 Covalent Bonding Examples of covalent bonding
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12 Polar Covalent Bond Polarity occurs when atoms electrons unequally due to differences in electronegativities. This is seen in water (H 2 O).
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