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Chemical Reactions

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

 
   
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