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Chemical Reactions

Practice Test
  1.In a __________ reaction, two or more substances combine to form another substance.  
  a.   synthesis  
  b.   decomposition  
  c.   double displacement  
  d.   single displacement  
  2.__________ is a way to describe a chemical reaction using chemical formulas and symbols.  
  a.   A physical law  
  b.   A chemical equation  
  c.   The law of conservation of matter  
  d.   Synthesis  
  3.New substances produced by a chemical reaction are __________ .  
  a.   coefficients  
  b.   resultants  
  c.   reactants  
  d.   products  
  4.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 less than 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  
  5.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.   oxygen  
  d.   rust  
  6.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.   7.0 g  
  c.   1.7 g  
  d.   19.3 g  
  7.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  
  8.A(n) __________ is a substance that speeds up a chemical reaction without being permanently changed itself.  
  a.   inhibitor  
  b.   exotherm  
  c.   endotherm  
  d.   catalyst  
  9.In chemical equations, __________ represent the number of units of each substance.  
  a.   coefficients  
  b.   products  
  c.   precipitates  
  d.   reactants  
  10.Some elements usually exist in combinations of two atoms. These combinations are called __________ .  
  a.   coefficients  
  b.   ions  
  c.   diatomic molecules  
  d.   isotopes  
  11.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 solid products weigh the same as the reactants.  
  c.   The same number of atoms of each element is on both sides of the equation.  
  d.   The number of reactants is equal to the number of products.  
  12.If electric current passes through water and initiates a decomposition reaction, what are the expected products?  
  a.   hydrogen peroxide  
  b.   hydrogen oxide  
  c.   hydrogen and oxygen  
  d.   oxygen and water  
  13.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.  
  14.What type of reaction produces a precipitate?  
  a.   double displacement  
  b.   decomposition  
  c.   single displacement  
  d.   synthesis  
  15.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  
  16.An insoluble compound that comes out of solution during a double displacement reaction is called a __________ .  
  a.   solvent  
  b.   catalyst  
  c.   precipitate  
  d.   reactant  
  17.A change in which one or more substances are converted into new substances is a __________ .  
  a.   chemical reaction  
  b.   physical change  
  c.   nuclear reaction  
  d.   chemical fusion  
  18.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  

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