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Chemical Reactions

Practice Test
      
  1.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.  
  Hint    
      
  2.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.  
  Hint    
      
  3.In a __________ reaction, two or more substances combine to form another substance.  
  a.   double displacement  
  b.   decomposition  
  c.   synthesis  
  d.   single displacement  
  Hint    
      
  4.As a result of the experiments of Lavoisier, you know that in a chemical reaction the mass of the products __________.  
  a.   is less than 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.   cannot be predicted based on the mass of the reactants  
  Hint    
      
  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.   19.3 g  
  c.   7.0 g  
  d.   0.7 g  
  Hint    
      
  6.In chemical equations, __________ represent the number of units of each substance.  
  a.   reactants  
  b.   precipitates  
  c.   coefficients  
  d.   products  
  Hint    
      
  7.An insoluble compound that comes out of solution during a double displacement reaction is called a __________ .  
  a.   reactant  
  b.   catalyst  
  c.   precipitate  
  d.   solvent  
  Hint    
      
  8.A(n) __________ is a substance that speeds up a chemical reaction without being permanently changed itself.  
  a.   endotherm  
  b.   catalyst  
  c.   inhibitor  
  d.   exotherm  
  Hint    
      
  9.If electric current passes through water and initiates a decomposition reaction, what are the expected products?  
  a.   oxygen and water  
  b.   hydrogen oxide  
  c.   hydrogen peroxide  
  d.   hydrogen and oxygen  
  Hint    
      
  10.Which of the following is a chemical reaction?  
  a.   rust forming on a car body  
  b.   water evaporating from salt water leaving salt crystals  
  c.   water freezing into ice  
  d.   dew forming on grass  
  Hint    
      
  11.The chemical formula for a compound tells __________ .  
  a.   what elements it contains  
  b.   how electrons are arranged  
  c.   how stable the compound is  
  d.   what type of chemical bond it forms  
  Hint    
      
  12.New substances produced by a chemical reaction are __________ .  
  a.   resultants  
  b.   reactants  
  c.   products  
  d.   coefficients  
  Hint    
      
  13.__________ is a way to describe a chemical reaction using chemical formulas and symbols.  
  a.   Synthesis  
  b.   A chemical equation  
  c.   The law of conservation of matter  
  d.   A physical law  
  Hint    
      
  14.Some elements usually exist in combinations of two atoms. These combinations are called __________ .  
  a.   ions  
  b.   diatomic molecules  
  c.   coefficients  
  d.   isotopes  
  Hint    
      
  15.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  
  Hint    
      
  16.A change in which one or more substances are converted into new substances is a __________ .  
  a.   physical change  
  b.   nuclear reaction  
  c.   chemical fusion  
  d.   chemical reaction  
  Hint    
      
  17.What type of reaction produces a precipitate?  
  a.   single displacement  
  b.   synthesis  
  c.   decomposition  
  d.   double displacement  
  Hint    
      
  18.The law of conservation of mass states that __________ .  
  a.   matter can be created and destroyed but does not change forms  
  b.   in a chemical reaction, efforts should be made to preserve rare elements without changing them  
  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  
  Hint    

 
   
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