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Chemical Bonds

Practice Test
  1.How many electrons are shared in a double bond?  
  a.   two  
  b.   two pairs  
  c.   one  
  d.   one pair  
  2.Binary compounds are composed of __________ atoms.  
  a.   two  
  b.   many  
  c.   four  
  d.   one  
  3.When elements form bonds, it changes their __________ properties.  
  a.   mass  
  b.   chemical and physical  
  c.   physical  
  d.   chemical  
  4.Is a molecule of hydrogen chloride (HCl) polar or nonpolar?  
  a.   neither  
  b.   polar  
  c.   nonpolar  
  d.   both  
  5.In general, noble gases react with __________.  
  a.   water  
  b.   other noble gases  
  c.   metals  
  d.   nothing  
  6.A complex ion is __________.  
  a.   only found in compounds  
  b.   an ion made from a large atom  
  c.   an ion with more than one atom  
  d.   a single atom that has formed an ion  
  7.A polyatomic ion is another name for a __________ ion.  
  a.   negative  
  b.   neutral  
  c.   positive  
  d.   complex  
  8.The atom that contains the fewest electrons is __________.  
  a.   hydrogen  
  b.   oxygen  
  c.   helium  
  d.   water  
  9.Chemical compounds are __________.  
  a.   always stable  
  b.   always unstable  
  c.   more stable than their individual elements  
  d.   less stable than their individual elements  
  10.In a covalent bond, electrons are __________.  
  a.   lost  
  b.   shared  
  c.   gained  
  d.   destroyed  
  11.When an atom's outer energy levels are not filled completely, the atom __________.  
  a.   is very stable  
  b.   cannot form a compound  
  c.   is a noble gas  
  d.   can gain, lose, or share electrons  
  12.In sodium chloride, which atom loses an electron?  
  a.   chloride  
  b.   neither  
  c.   salt  
  d.   sodium  
  13.A binary compound made with phosphorus will end with the word __________.  
  a.   phosphate  
  b.   phosphorus  
  c.   phosphide  
  d.   phosphite  
  14.What kind of charge does an ionic compound carry?  
  a.   negative  
  b.   unknown  
  c.   positive  
  d.   neutral  
  15.Why is potassium iodine added to table salt?  
  a.   to add to the flavor of salt  
  b.   Iodine is an element essential for health.  
  c.   Table salt causes high blood pressure.  
  d.   Iodine is in the formula for table salt.  
  16.For an ion, the oxidation number is __________.  
  a.   the same as the charge on the ion  
  b.   zero  
  c.   one less than the charge on the ion  
  d.   always negative  
  17.A compound __________.  
  a.   is a pure element  
  b.   is a combination of two or more elements  
  c.   is composed of only metals  
  d.   has the same properties as its parts  
  18.What is the difference between carbon monoxide and carbon dioxide?  
  a.   Carbon monoxide has only one oxygen atom.  
  b.   Carbon monoxide has two carbon atoms.  
  c.   Carbon dioxide has only one oxygen atom.  
  d.   Carbon dioxide has two carbon atoms.  
  19.The iodine ion I- carries what type of charge?  
  a.   both  
  b.   neutral  
  c.   positive  
  d.   negative  
  20.NaCl is the chemical formula for what?  
  a.   sodium chloride  
  b.   chlorine gas  
  c.   water  
  d.   sodium metal  

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