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Chemical Reactions

Practice Test
  1.Some elements usually exist in combinations of two atoms. These combinations are called __________ .  
  a.   ions  
  b.   isotopes  
  c.   coefficients  
  d.   diatomic molecules  
  2.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  
  3.What does it mean for a chemical equation to be balanced?  
  a.   The same number of atoms of each element is on both sides of the equation.  
  b.   The number of reactants is equal to the number of products.  
  c.   The reactants and the products are written with the same coefficients.  
  d.   The solid products weigh the same as the reactants.  
  4.When iron combines with oxygen and water in the air to form rust, what substance in the reaction is the product?  
  a.   rust  
  b.   iron  
  c.   oxygen  
  d.   water  
  5.Which of the following is a chemical reaction?  
  a.   dew forming on grass  
  b.   rust forming on a car body  
  c.   water freezing into ice  
  d.   water evaporating from salt water leaving salt crystals  
  6.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  
  7.In chemical equations, __________ represent the number of units of each substance.  
  a.   reactants  
  b.   products  
  c.   coefficients  
  d.   precipitates  
  8.__________ is a way to describe a chemical reaction using chemical formulas and symbols.  
  a.   The law of conservation of matter  
  b.   A physical law  
  c.   A chemical equation  
  d.   Synthesis  
  9.The chemical formula for a compound tells __________ .  
  a.   what type of chemical bond it forms  
  b.   how stable the compound is  
  c.   what elements it contains  
  d.   how electrons are arranged  
  10.Why is oxygen written with a subscript 2?  
  a.   Its mass is twice as great as the reactants'.  
  b.   It usually exists as a diatomic molecule.  
  c.   There are two times as many oxygen atoms as reactant atoms.  
  d.   Its mass increases by two times as a result of the reaction.  
  11.A(n) __________ is a substance that speeds up a chemical reaction without being permanently changed itself.  
  a.   inhibitor  
  b.   catalyst  
  c.   endotherm  
  d.   exotherm  
  12.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 peroxide  
  d.   hydrogen oxide  
  13.New substances produced by a chemical reaction are __________ .  
  a.   coefficients  
  b.   products  
  c.   resultants  
  d.   reactants  
  14.A change in which one or more substances are converted into new substances is a __________ .  
  a.   physical change  
  b.   chemical reaction  
  c.   nuclear reaction  
  d.   chemical fusion  
  15.What type of reaction produces a precipitate?  
  a.   double displacement  
  b.   synthesis  
  c.   single displacement  
  d.   decomposition  
  16.In a __________ reaction, two or more substances combine to form another substance.  
  a.   synthesis  
  b.   single displacement  
  c.   decomposition  
  d.   double displacement  
  17.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.   19.3 g  
  c.   0.7 g  
  d.   1.7 g  
  18.An insoluble compound that comes out of solution during a double displacement reaction is called a __________ .  
  a.   precipitate  
  b.   solvent  
  c.   catalyst  
  d.   reactant  

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