Back to Review sheet

Name ________________________________________ Chemistry Exam Review

  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. This is where toms share their outer electrons to complete their rings.


  1. Explain why fluorine can have an ionic charge of " -1". If fluorine takes an electron to complete its ring it becomes an ion with a -1 charge. This is because it has 9 + and 10-.


  1. Why is it that Chlorine and Fluorine behave somewhat alike? They each have 7 outer electrons. The each only need one more electron to complete their outer ring.



  1. __outer_ What is another word for "valent"?
  2. __5 ___ 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. __H __ Which atom of a water molecule is slightly more positive in charge?
  2. Name an atom that makes 1 bond (H, F, Cl, Br, I, At)
  3. Write the formula for the missing compound below.

              LiOH + HF -----> H2O + _____LiF_____.

  1. Balance this equation:

2 Al + 3CuO ------> Al2O3 + 3 Cu.

  1. What elements make up your body? Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Sulphur
  2. __12_ How many atoms are in 2 C2H4? __2__ elements? _2_ Molecules?
  3. ______Al____ = 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? Add a catalyst or heat


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


  1. All carbon atoms must have the same number of ______Protons_______
  2. An example of a lipid is _________fat_____________
  3. Glucose, a carbohydrate, has the formula: ______________C6H12O6________________
  4. An atom with a positive or negative charge is called an ____ ion _______
  5. What new atom will you get if a proton is added to the nucleus of oxygen?__ F _
  6. Why can't sodium bond covalently?

It can't complete its outer ring.


  1. What is the formula when Al mixes with Cl? ______AlCl3_____
  2. Identify each reaction below:

A) Addition                       D) Decomposition                           S) Single Displacement     

__A_ C + O2 ---> CO2                      D  CO2 ---> C + O2

  1. What did Dimitri Mendeleev do? Created periodic table


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

Protons = +,

Electrons = -

Neutrons = neutral


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

It is noble.

  1. What makes atoms of one element different from atoms of another element? # of protons in the nucleus
  2. What is a catalyst? Something that speeds up a chemical reaction.

Back to chemistry page