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Chemical Reactions

Practice Test
      
  1.In a __________ reaction, two or more substances combine to form another substance.  
  a.   decomposition  
  b.   synthesis  
  c.   single displacement  
  d.   double displacement  
  Hint    
      
  2.New substances produced by a chemical reaction are __________ .  
  a.   coefficients  
  b.   resultants  
  c.   products  
  d.   reactants  
  Hint    
      
  3.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.   0.7 g  
  b.   19.3 g  
  c.   7.0 g  
  d.   1.7 g  
  Hint    
      
  4.The chemical formula for a compound tells __________ .  
  a.   what type of chemical bond it forms  
  b.   what elements it contains  
  c.   how stable the compound is  
  d.   how electrons are arranged  
  Hint    
      
  5.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.   in a chemical reaction, matter is not created or destroyed, but is conserved  
  d.   matter can be created and destroyed but does not change forms  
  Hint    
      
  6.If electric current passes through water and initiates a decomposition reaction, what are the expected products?  
  a.   hydrogen and oxygen  
  b.   hydrogen peroxide  
  c.   oxygen and water  
  d.   hydrogen oxide  
  Hint    
      
  7.Which of the following is a chemical reaction?  
  a.   water freezing into ice  
  b.   water evaporating from salt water leaving salt crystals  
  c.   dew forming on grass  
  d.   rust forming on a car body  
  Hint    
      
  8.Some elements usually exist in combinations of two atoms. These combinations are called __________ .  
  a.   coefficients  
  b.   diatomic molecules  
  c.   isotopes  
  d.   ions  
  Hint    
      
  9.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.   is less than the mass of the reactants  
  d.   cannot be predicted based on the mass of the reactants  
  Hint    
      
  10.What type of reaction produces a precipitate?  
  a.   single displacement  
  b.   double displacement  
  c.   decomposition  
  d.   synthesis  
  Hint    
      
  11.A(n) __________ is a substance that speeds up a chemical reaction without being permanently changed itself.  
  a.   catalyst  
  b.   inhibitor  
  c.   endotherm  
  d.   exotherm  
  Hint    
      
  12.When iron combines with oxygen and water in the air to form rust, what substance in the reaction is the product?  
  a.   water  
  b.   iron  
  c.   rust  
  d.   oxygen  
  Hint    
      
  13.A change in which one or more substances are converted into new substances is a __________ .  
  a.   physical change  
  b.   chemical reaction  
  c.   nuclear reaction  
  d.   chemical fusion  
  Hint    
      
  14.Why is oxygen written with a subscript 2?  
  a.   Its mass is twice as great as the reactants'.  
  b.   It usually exists as a diatomic molecule.  
  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    
      
  15.An insoluble compound that comes out of solution during a double displacement reaction is called a __________ .  
  a.   solvent  
  b.   catalyst  
  c.   reactant  
  d.   precipitate  
  Hint    
      
  16.In chemical equations, __________ represent the number of units of each substance.  
  a.   coefficients  
  b.   reactants  
  c.   products  
  d.   precipitates  
  Hint    
      
  17.__________ is a way to describe a chemical reaction using chemical formulas and symbols.  
  a.   A physical law  
  b.   Synthesis  
  c.   The law of conservation of matter  
  d.   A chemical equation  
  Hint    
      
  18.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 same number of atoms of each element is on both sides of the equation.  
  c.   The solid products weigh the same as the reactants.  
  d.   The reactants and the products are written with the same coefficients.  
  Hint    

 
   
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