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Unformatted text preview: Problem Set #1 Lectures 2 and 3, Chapters 2, 3, 4, and 5 pp. 74-77. 1. What is the difference between a covalent bond and a hydrogen bond? Which bond is stronger? Can you speculate why this is the case? A covalent bond is the sharing of a pair of valence electrons by two atoms. A hydrogen bond forms when a hydrogen atom covalently bonded to one electronegative atom is also attracted to another electronegative atom. Covalent bonds are stronger than hydrogen bond because covalent bonds bond any two atoms that can share the accurate number of valence electrons. Hydrogen bond bonds only hydrogen with another electronegative atom. 2. Which four elements make up approximately 96% of living matter? A) carbon, sodium, chlorine, nitrogen B) carbon, sulfur, phosphorus, hydrogen C) oxygen, hydrogen, calcium, sodium D) carbon, hydrogen, nitrogen, oxygen 3. The reactive properties or chemical behavior of an atom depend on the number of A) valence shells in the atom....
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- Winter '08