Science Home Product Information Site Map Search Contact Us   Glencoe Online
Quizzes Quiz
Chemical Reactions

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

McGraw-Hill / Glencoe
The McGraw-Hill Companies