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Chemical Reactions

Practice Test
  1.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  
  2.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  
  3.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, 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, efforts should be made to preserve rare elements without changing them  
  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.In a __________ reaction, two or more substances combine to form another substance.  
  a.   single displacement  
  b.   synthesis  
  c.   double displacement  
  d.   decomposition  
  6.__________ is a way to describe a chemical reaction using chemical formulas and symbols.  
  a.   A physical law  
  b.   Synthesis  
  c.   A chemical equation  
  d.   The law of conservation of matter  
  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 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.  
  8.A(n) __________ is a substance that speeds up a chemical reaction without being permanently changed itself.  
  a.   exotherm  
  b.   catalyst  
  c.   endotherm  
  d.   inhibitor  
  9.Some elements usually exist in combinations of two atoms. These combinations are called __________ .  
  a.   coefficients  
  b.   isotopes  
  c.   ions  
  d.   diatomic molecules  
  10.If electric current passes through water and initiates a decomposition reaction, what are the expected products?  
  a.   hydrogen peroxide  
  b.   hydrogen and oxygen  
  c.   hydrogen oxide  
  d.   oxygen and water  
  11.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.   19.3 g  
  b.   0.7 g  
  c.   7.0 g  
  d.   1.7 g  
  12.The chemical formula for a compound tells __________ .  
  a.   how stable the compound is  
  b.   what elements it contains  
  c.   what type of chemical bond it forms  
  d.   how electrons are arranged  
  13.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.   always equals 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  
  14.When iron combines with oxygen and water in the air to form rust, what substance in the reaction is the product?  
  a.   oxygen  
  b.   iron  
  c.   rust  
  d.   water  
  15.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.  
  16.In chemical equations, __________ represent the number of units of each substance.  
  a.   precipitates  
  b.   coefficients  
  c.   products  
  d.   reactants  
  17.What type of reaction produces a precipitate?  
  a.   single displacement  
  b.   synthesis  
  c.   double displacement  
  d.   decomposition  
  18.New substances produced by a chemical reaction are __________ .  
  a.   resultants  
  b.   products  
  c.   coefficients  
  d.   reactants  

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