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Chemical Reactions

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

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