Completion Section

Correctly complete the following statements.

1.   Any substance produced in a chemical reaction is called a(n) ________________.

2.   Any substance which enters a chemical reaction is called a(n) ________________.

3.   A(n) ________________ reaction involves combining simpler substances to form a more complex one

4.   In a(n) ____________________ reaction an uncombined element replaces an element
      that is part of a compound.

5.   An exothermic reaction _________________ heat energy.

6.   An endothermic reaction ________________ heat energy.

7.   __________________ energy is the energy needed to start a chemical reaction.

8.   __________________ is the study of reaction rates.

9.   Reaction _______________ is the amount of time it takes for a chemical reaction to occur.

10. A(n) __________________ is any substance added to a reaction which speeds the reaction
      without becoming part of the reaction itself.

11. In a(n) ____________________ reaction,  a complex substance is split it into two or more
      simpler substances.

12. A(n) _____________________ is any organic catalyst.

Multiple Choice Section:   Choose the phrase or response which best completes the following statements
                                        or answers the following questions.

1.   In a physical change,     (1.)  new substances are produced.
      (2.)  precipitation occurs.    (3.)  elements form compounds.
      (4.)  a substance changes state or appearance.

2.   In a chemical change,   (1.) a substance changes from a solid to a liquid.
      (2.)  new substances are produced.   (3.) a substance changes from a liquid to a gas.
      (4.)  heat is always released.

3.   Chemical reactions occur when   (1.) pure substances form mixtures.
      (2.) chemical bonds are formed or broken.   (3.)  matter is dissolved.
      (4.) the form or appearance of a substance is changed.

4.   In the formula, H₂SO4, how many atoms are there?   (1.) 6  (2.) 2  (3.) 4  (4.) 7

5.   A chemical reaction in which a compound is broken down into simpler substances is a(n)
      (1.)  synthesis reaction.   (2.) decomposition reaction.   (3.) replacement reaction.
      (4.)  endothermic reaction.

6.   A reaction in which one element is substituted for another in a compound is called a(n)
      (1.) exothermic reaction.  (2.) synthesis reaction.  (3.) decomposition reaction.
      (4.) replacement reaction.

7.   A material that increases the rate of a chemical reaction by lowering the activation energy is called a(n)
      (1.)  catalyst.  (2.)  inhibitor.  (3.)  coefficient.  (4.) precipitate.

Short Answer Section

1.    Balance the following equations

a.)         _____ CaO --->  _____ Ca +  O₂

b.)         _____ MgCO₃   +   _____  HCl   -----> MgCl₂   +   H₂CO₃
 

2.   List three factors which influence the rate of a chemical reaction and explain how they influence
      the rate of the reaction.
 
 
 
 
 

3.   Use the periodic table on pp. 142-143 of your textbook (older purple book) to calculate the molecular mass of the
      following compounds.

a.)   H₂O
 

b.)  CaO
 
 

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