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Chemical Bonds

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

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