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Chemical Reactions

Practice Test
  1.__________ 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  
  2.When iron combines with oxygen and water in the air to form rust, what substance in the reaction is the product?  
  a.   iron  
  b.   oxygen  
  c.   rust  
  d.   water  
  3.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.   always equals the mass of the reactants  
  c.   is twice as great as the mass of the reactants  
  d.   is less than the mass of the reactants  
  4.Which of the following is a chemical reaction?  
  a.   rust forming on a car body  
  b.   water freezing into ice  
  c.   dew forming on grass  
  d.   water evaporating from salt water leaving salt crystals  
  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.   0.7 g  
  c.   7.0 g  
  d.   19.3 g  
  6.Some elements usually exist in combinations of two atoms. These combinations are called __________ .  
  a.   ions  
  b.   isotopes  
  c.   coefficients  
  d.   diatomic molecules  
  7.The chemical formula for a compound tells __________ .  
  a.   how stable the compound is  
  b.   how electrons are arranged  
  c.   what type of chemical bond it forms  
  d.   what elements it contains  
  8.A(n) __________ is a substance that speeds up a chemical reaction without being permanently changed itself.  
  a.   exotherm  
  b.   inhibitor  
  c.   endotherm  
  d.   catalyst  
  9.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  
  10.An insoluble compound that comes out of solution during a double displacement reaction is called a __________ .  
  a.   catalyst  
  b.   precipitate  
  c.   reactant  
  d.   solvent  
  11.New substances produced by a chemical reaction are __________ .  
  a.   reactants  
  b.   products  
  c.   resultants  
  d.   coefficients  
  12.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 number of reactants is equal to the number of products.  
  d.   The solid products weigh the same as the reactants.  
  13.If electric current passes through water and initiates a decomposition reaction, what are the expected products?  
  a.   hydrogen peroxide  
  b.   hydrogen oxide  
  c.   hydrogen and oxygen  
  d.   oxygen and water  
  14.In chemical equations, __________ represent the number of units of each substance.  
  a.   precipitates  
  b.   products  
  c.   coefficients  
  d.   reactants  
  15.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  
  16.What type of reaction produces a precipitate?  
  a.   single displacement  
  b.   synthesis  
  c.   decomposition  
  d.   double displacement  
  17.Why is oxygen written with a subscript 2?  
  a.   There are two times as many oxygen atoms as reactant atoms.  
  b.   It usually exists as a diatomic molecule.  
  c.   Its mass increases by two times as a result of the reaction.  
  d.   Its mass is twice as great as the reactants'.  
  18.In a __________ reaction, two or more substances combine to form another substance.  
  a.   double displacement  
  b.   synthesis  
  c.   single displacement  
  d.   decomposition  

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