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Chemical Reactions

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

 
   
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