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Chemical Reactions

Practice Test
      
  1.A change in which one or more substances are converted into new substances is a __________ .  
  a.   nuclear reaction  
  b.   physical change  
  c.   chemical reaction  
  d.   chemical fusion  
  Hint    
      
  2.New substances produced by a chemical reaction are __________ .  
  a.   coefficients  
  b.   products  
  c.   reactants  
  d.   resultants  
  Hint    
      
  3.What type of reaction produces a precipitate?  
  a.   decomposition  
  b.   synthesis  
  c.   double displacement  
  d.   single displacement  
  Hint    
      
  4.__________ is a way to describe a chemical reaction using chemical formulas and symbols.  
  a.   Synthesis  
  b.   A chemical equation  
  c.   A physical law  
  d.   The law of conservation of matter  
  Hint    
      
  5.Some elements usually exist in combinations of two atoms. These combinations are called __________ .  
  a.   diatomic molecules  
  b.   coefficients  
  c.   ions  
  d.   isotopes  
  Hint    
      
  6.If electric current passes through water and initiates a decomposition reaction, what are the expected products?  
  a.   oxygen and water  
  b.   hydrogen peroxide  
  c.   hydrogen and oxygen  
  d.   hydrogen oxide  
  Hint    
      
  7.A(n) __________ is a substance that speeds up a chemical reaction without being permanently changed itself.  
  a.   exotherm  
  b.   catalyst  
  c.   inhibitor  
  d.   endotherm  
  Hint    
      
  8.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 twice as great as the mass of the reactants  
  d.   is less than the mass of the reactants  
  Hint    
      
  9.Why is oxygen written with a subscript 2?  
  a.   It usually exists as a diatomic molecule.  
  b.   There are two times as many oxygen atoms as reactant atoms.  
  c.   Its mass increases by two times as a result of the reaction.  
  d.   Its mass is twice as great as the reactants'.  
  Hint    
      
  10.In chemical equations, __________ represent the number of units of each substance.  
  a.   precipitates  
  b.   coefficients  
  c.   reactants  
  d.   products  
  Hint    
      
  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.   1.7 g  
  b.   0.7 g  
  c.   7.0 g  
  d.   19.3 g  
  Hint    
      
  12.In a __________ reaction, two or more substances combine to form another substance.  
  a.   double displacement  
  b.   decomposition  
  c.   single displacement  
  d.   synthesis  
  Hint    
      
  13.The chemical formula for a compound tells __________ .  
  a.   what elements it contains  
  b.   what type of chemical bond it forms  
  c.   how stable the compound is  
  d.   how electrons are arranged  
  Hint    
      
  14.When iron combines with oxygen and water in the air to form rust, what substance in the reaction is the product?  
  a.   iron  
  b.   water  
  c.   rust  
  d.   oxygen  
  Hint    
      
  15.An insoluble compound that comes out of solution during a double displacement reaction is called a __________ .  
  a.   catalyst  
  b.   reactant  
  c.   precipitate  
  d.   solvent  
  Hint    
      
  16.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 same number of atoms of each element is on both sides of the equation.  
  c.   The number of reactants is equal to the number of products.  
  d.   The solid products weigh the same as the reactants.  
  Hint    
      
  17.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    
      
  18.Which of the following is a chemical reaction?  
  a.   rust forming on a car body  
  b.   dew forming on grass  
  c.   water freezing into ice  
  d.   water evaporating from salt water leaving salt crystals  
  Hint    

 
   
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