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Chemical Reactions

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

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