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Chemical Reactions

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