Bio Ch 2 - whereas a hydrogen bond is a weak attraction...

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Biology 1101 Chapter 2 Review Questions 1. An element is a fundamental form of matter that has mass ad takes up space, and at least here on Earth it can’t be broken down into something else. Oxygen, hydrogen, carbon, and nitrogen make up the most body weight in all living organisms. 2. A) atom: smallest particle that retains the property of an element B) isotope: atoms that vary in neutron number C) radioisotope: an isotope that has an unstable nucleus and becomes more stabilized by spontaneously emitting energy and particles. 3. Each orbital can house one or at most two electrons. By the shell model, the first orbital is in the first shell, the second shell has four more available orbitals, more orbitals fit in the third shell, and so on. 4. A) molecule: forms when two or more atoms join B) compound: consists of two or more different elements C) mixture: two or more elements or compounds intermingle 5. A) An ionic bond is an association of two ions that have opposing charges
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Unformatted text preview: whereas a hydrogen bond is a weak attraction between an electronegative atom and a hydrogen atom. B) A polar covalent bond is when atoms of different elements don’t exert the same pull on shared electrons whereas a nonpolar covalent bond is when there is no difference in charge between the two ends of the bond. C) Hydrophilic substances is when sugars and other polar molecules easily hydrogen bond with a water molecule whereas a hydrophobic substance repels oils and other nonpolar molecules. 6. Water attracts polar molecules and repels nonpolar molecules because the charge water does carry is unevenly distributed, which makes its oxygen end a bit negative and its hydrogen end a bit positive. 7. An acid donates protons (H + ) to the water solution when dissolved in water and a base accepts H + when dissolved in water. A weak acid will try to neutralize whenever it is in solutions....
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This note was uploaded on 03/21/2008 for the course BIO 1101 taught by Professor Stevedyche during the Spring '08 term at Appalachian State.

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