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Unformatted text preview: 2006 Bio 93 D Homework 2 Key Dr. McNulty 1) The reactive properties or chemical behavior of an atom depend on the number of A) valence shells in the atom. B) orbitals found in the atom. C) electrons in each orbital of the atom. D) electrons in the outer valence shell in the atom. E) hybridized orbitals in the atom. 2) Atoms whose outer electron shells contain eight electrons tend to A) form ionic bonds in aqueous solutions. B) form covalent bonds in aqueous solutions. C) be stable and chemically nonreactive or inert. D) be unstable and chemically very reactive. E) be isotopes and very radioactive 3) A covalent chemical bond is one in which A) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged. B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms. C) outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. D) outer-shell electrons of one atom are transferred to the inner electron shells of another atom. E) inner-shell electrons of one atom are transferred to the outer electron shell of another atom. 4) What do atoms form when they share electron pairs? A) elements B) ions C) aggregates D) isotopes E) molecules 5) Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH 3)? A) Each hydrogen atom has a partial positive charge. B) The nitrogen atom has a strong positive charge. C) Each hydrogen atom has a slight negative charge. D) The nitrogen atom has a partial positive charge. E) There are covalent bonds between the hydrogen atoms. 6) When two atoms are equally electronegative, they will interact to form A) equal numbers of isotopes. B) ions. C) polar covalent bonds. D) nonpolar covalent bonds. E) ionic bonds. 7) What results from an unequal sharing of electrons between atoms. A) a nonpolar covalent bond B) a polar covalent bond C) an ionic bond D) a hydrogen bond E) a hydrophobic interaction 8) A covalent bond is likely to be polar when A) one of the atoms sharing electrons is more electronegative than the other atom. B) the two atoms sharing electrons are equally electronegative. C) the two atoms sharing electrons are of the same element. D) it is between two atoms that are both very strong electron acceptors. E) the two atoms sharing electrons are different elements. 9) A polar covalent bond can form when A) there is the loss of one or more electrons from one atom to another atom of the same molecule. B) there is the gain of one or more electrons from one atom to another atom of the same molecule. C) one of the atoms has a greater affinity for electrons than the other atom of the same molecule....
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- Summer '08