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Chemical Reactions

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

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