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Chemical Reactions

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

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