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Chemical Reactions

Practice Test
  1.Some elements usually exist in combinations of two atoms. These combinations are called __________ .  
  a.   ions  
  b.   coefficients  
  c.   isotopes  
  d.   diatomic molecules  
  2.A(n) __________ is a substance that speeds up a chemical reaction without being permanently changed itself.  
  a.   exotherm  
  b.   catalyst  
  c.   inhibitor  
  d.   endotherm  
  3.In chemical equations, __________ represent the number of units of each substance.  
  a.   coefficients  
  b.   reactants  
  c.   products  
  d.   precipitates  
  4.The law of conservation of mass states that __________ .  
  a.   in a chemical reaction, efforts should be made to preserve rare elements without changing them  
  b.   in a chemical reaction, the final mass of the products is always greater than the starting mass of the reactants  
  c.   in a chemical reaction, matter is not created or destroyed, but is conserved  
  d.   matter can be created and destroyed but does not change forms  
  5.What does it mean for a chemical equation to be balanced?  
  a.   The reactants and the products are written with the same coefficients.  
  b.   The solid products weigh the same as the reactants.  
  c.   The same number of atoms of each element is on both sides of the equation.  
  d.   The number of reactants is equal to the number of products.  
  6.An insoluble compound that comes out of solution during a double displacement reaction is called a __________ .  
  a.   solvent  
  b.   reactant  
  c.   catalyst  
  d.   precipitate  
  7.What type of reaction produces a precipitate?  
  a.   decomposition  
  b.   double displacement  
  c.   single displacement  
  d.   synthesis  
  8.Which of the following is a chemical reaction?  
  a.   water evaporating from salt water leaving salt crystals  
  b.   dew forming on grass  
  c.   rust forming on a car body  
  d.   water freezing into ice  
  9.Ten grams of mercury(II) oxide react to produce 9.3 g of mercury and oxygen. What is the mass of the oxygen produced?  
  a.   0.7 g  
  b.   7.0 g  
  c.   19.3 g  
  d.   1.7 g  
  10.A change in which one or more substances are converted into new substances is a __________ .  
  a.   nuclear reaction  
  b.   chemical fusion  
  c.   physical change  
  d.   chemical reaction  
  11.__________ is a way to describe a chemical reaction using chemical formulas and symbols.  
  a.   The law of conservation of matter  
  b.   A physical law  
  c.   A chemical equation  
  d.   Synthesis  
  12.As a result of the experiments of Lavoisier, you know that in a chemical reaction the mass of the products __________.  
  a.   cannot be predicted based on the mass of the reactants  
  b.   is twice as great as the mass of the reactants  
  c.   always equals the mass of the reactants  
  d.   is less than the mass of the reactants  
  13.The chemical formula for a compound tells __________ .  
  a.   how stable the compound is  
  b.   what elements it contains  
  c.   how electrons are arranged  
  d.   what type of chemical bond it forms  
  14.When iron combines with oxygen and water in the air to form rust, what substance in the reaction is the product?  
  a.   iron  
  b.   rust  
  c.   oxygen  
  d.   water  
  15.If electric current passes through water and initiates a decomposition reaction, what are the expected products?  
  a.   hydrogen and oxygen  
  b.   oxygen and water  
  c.   hydrogen peroxide  
  d.   hydrogen oxide  
  16.Why is oxygen written with a subscript 2?  
  a.   Its mass increases by two times as a result of the reaction.  
  b.   Its mass is twice as great as the reactants'.  
  c.   It usually exists as a diatomic molecule.  
  d.   There are two times as many oxygen atoms as reactant atoms.  
  17.In a __________ reaction, two or more substances combine to form another substance.  
  a.   synthesis  
  b.   double displacement  
  c.   single displacement  
  d.   decomposition  
  18.New substances produced by a chemical reaction are __________ .  
  a.   products  
  b.   resultants  
  c.   coefficients  
  d.   reactants  

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