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Name ________________________________________ Chemistry Exam Review Answers

  1. Circle everything that is ionic:

Molecules,                             share,                     metals + nonmetals,            charges,

salt,                                         transfer,                                 nonmetals + nonmetals

  1. Covalent or Ionic? Circle the ionic compounds

CO2

Na2O

NaF

AlF3

 

                                                                 

  1. Which type of element can make ionic and covalent bonds?

Metal? Nonmetal?

  1. What is covalent bonding? Define it.

 

  1. Explain why fluorine can have an ionic charge of " -1".

 

  1. Why is it that Chlorine and Fluorine behave somewhat alike?

 

 

  1. _________________ What is another word for "valent"?
  2. ________ How many valent electrons will you find in neutral nitrogen?
  3. Draw all of the rings for beryllium below. Place the correct number of electrons on each ring.

 

 

 

  1. Draw these molecules: Please show all valent electrons. Be neat!           

Fluorine Gas:                                        acetylene gas: C2H2

 

 

 

  1. _______ Which atom of a water molecule is slightly more positive in charge?
  2. _______ Name an atom that makes 1 bond
  3. Write the formula for the missing compound below.

                LiOH + HF -----> H2O + ___________________.

  1. Balance this equation:

____ Al + ______ CuO ------> _____ Al2O3 + _____ Cu.

  1. What elements make up your body? ______________________________
  2. ______ How many atoms are in 2 C2H4? _____ elements? ___ Molecules?
  3. _______________ = This metal has 3 electrons on its 3rd ring. Its first 2 rings are complete.
  4. If you wanted to speed up a reaction, what would you do?

 

 

 

  1. What do we call atoms that have more neutrons, or fewer neutrons than normal?

 

  1. All carbon atoms must have the same number of ______________________
  2. An example of a lipid is _________________________________
  3. Glucose, a carbohydrate, has the formula: ______________________________
  4. An atom with a positive or negative charge is called an _______________
  5. What new atom will you get if a proton is added to the nucleus of oxygen?_____

 

  1. Why can't sodium bond covalently?

 

 

  1. What is the formula when Al mixes with Cl? _________________
  2. Identify each reaction below:

A) Addition                           D) Decomposition                               S) Single Displacement      

______ C + O2 ---> CO2                      ______ CO2 ---> C + O2

  1. What did Dimitri Mendeleev do?

 

  1. What are the 3 subatomic particles that make up atoms? What is the charge of each particle?

 

  1. Why doesn't helium react with other atoms?

 

  1. What makes atoms of one element different from atoms of another element?
  2. What is a catalyst?

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