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Chemical Reactions

Practice Test
  1.As a result of the experiments of Lavoisier, you know that in a chemical reaction the mass of the products __________.  
  a.   is less than the mass of the reactants  
  b.   always equals the mass of the reactants  
  c.   is twice as great as the mass of the reactants  
  d.   cannot be predicted based on the mass of the reactants  
  2.In chemical equations, __________ represent the number of units of each substance.  
  a.   precipitates  
  b.   coefficients  
  c.   reactants  
  d.   products  
  3.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.   19.3 g  
  c.   7.0 g  
  d.   1.7 g  
  4.In a __________ reaction, two or more substances combine to form another substance.  
  a.   synthesis  
  b.   decomposition  
  c.   double displacement  
  d.   single displacement  
  5.An insoluble compound that comes out of solution during a double displacement reaction is called a __________ .  
  a.   solvent  
  b.   precipitate  
  c.   catalyst  
  d.   reactant  
  6.New substances produced by a chemical reaction are __________ .  
  a.   coefficients  
  b.   products  
  c.   reactants  
  d.   resultants  
  7.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'.  
  8.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  
  9.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  
  10.A change in which one or more substances are converted into new substances is a __________ .  
  a.   chemical fusion  
  b.   nuclear reaction  
  c.   physical change  
  d.   chemical reaction  
  11.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 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 number of reactants is equal to the number of products.  
  12.If electric current passes through water and initiates a decomposition reaction, what are the expected products?  
  a.   hydrogen oxide  
  b.   hydrogen and oxygen  
  c.   oxygen and water  
  d.   hydrogen peroxide  
  13.What type of reaction produces a precipitate?  
  a.   double displacement  
  b.   synthesis  
  c.   decomposition  
  d.   single displacement  
  14.Some elements usually exist in combinations of two atoms. These combinations are called __________ .  
  a.   diatomic molecules  
  b.   isotopes  
  c.   ions  
  d.   coefficients  
  15.The chemical formula for a compound tells __________ .  
  a.   how electrons are arranged  
  b.   what type of chemical bond it forms  
  c.   how stable the compound is  
  d.   what elements it contains  
  16.A(n) __________ is a substance that speeds up a chemical reaction without being permanently changed itself.  
  a.   inhibitor  
  b.   catalyst  
  c.   endotherm  
  d.   exotherm  
  17.__________ is a way to describe a chemical reaction using chemical formulas and symbols.  
  a.   Synthesis  
  b.   A chemical equation  
  c.   The law of conservation of matter  
  d.   A physical law  
  18.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.   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, matter is not created or destroyed, but is conserved  

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