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Chemical Bonds

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

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