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Chemical Reactions

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

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