Lecture 2 presented

A all three atoms in water readily form hydrogen

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Unformatted text preview: c7ons in cells are oxida7on–reduc7on reac7ons. 32 32 How Do Atoms Change Partners in Chemical Reac7ons? In all chemical reac7ons, maRer and energy are neither created nor destroyed. Energy: capacity to do work or the capacity for change. Energy can change form during chemical reac7ons. 33 33 Solutions and acid/base chemistry 34 34 Clicker Ques7on 4 Which of the following characteris7cs does not apply to water? a. All three atoms in water readily form hydrogen bonds with other molecules. b. The covalent bonds in water are highly polarized. c. The water molecule readily forms hydrophobic interac7ons. d. The water molecule is asymmetric. 35 What Makes Water So Important for Life? A solu.on is a substance (solute) dissolved in a liquid (solvent). Many important biochemical reac7ons occur in aqueous solu)ons. 36 36 What Makes Water So Important for Life? Mole: The amount of a substance (in grams) that is numerically equal to its molecular weight. 1 mole of sodium ion Na+ = 23 g 1 mole of hydrogen gas H2 = 2 g 1 mole of table sugar (C12H22O11) = 342 g 37 37 What Makes Water So Important for Life? The number of molecules in 1 mole is constant for all substances. One mole contains 6.02 × 1023 molecules = Avogadro’s number 38 38 What Makes Water So Important for Life? A 1 molar solu.on (1M) is 1 mole of a substance dissolved in...
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