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Chemical Reactions

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

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