Chemistry

Chemistry - Non-polar Equal sharing Polar Unequal sharing...

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The Chemistry of Life Atoms, ions and molecules Ionic, covalent, and hydrogen bonds Solubility and water Organic macromolecules Recall…
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The Chemical Elements Element ± simplest form of matter with unique chemical properties Atom ± smallest unit of an element that has all the chemical characteristics of that element Only 24 elements have a role in our body ± 98.5% of body weight consists of O, C, H, N, Ca, P Atomic Structure Nucleus - center of atom ± protons: positive charge ± neutrons: neutral charge Electron shells ± electrons: negative charge ± # of electrons = # of protons atoms have neutral charge ± interactions between electrons of two or more atoms form chemical bonds Æ molecules Molecules Atoms
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Molecules and Chemical Bonds Molecules ± two or more chemically bonded atoms of the same or different element Chemical bonds ± Ionic transfer of electron from one atom to another association of resulting ions in the body, often referred to as electrolytes ± Covalent sharing of electrons
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Unformatted text preview: Non-polar Equal sharing Polar Unequal sharing electrons shared equally electrons shared unequally Hydrogen Bonds Attraction between polar molecules Greatest physiological importance determines the properties of water influences solubility charged molecules (ions and polar molecules) dissolve in polar fluids (esp. water) determines shapes of complex molecules proteins, DNA Review Questions 1. Define element, atom, molecule, chemical bond, ion, soluble, solvent, solute. 2. Explain the differences between ionic bonds and the different types of covalent bonds. Provide examples of molecules that exhibit each type of bond. 3. What are hydrogen bonds and what is their significance in biology? 4. What is meant by universal solvent? Why is water considered a universal solvent? 5. What is meant by water soluble and water insoluble (lipid soluble). What would make a molecule be water soluble or insoluble?...
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Chemistry - Non-polar Equal sharing Polar Unequal sharing...

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