Download Counting Atoms and Ionic Compounds Test Review Study guide

Counting Atoms and Ionic Compounds Test Review Study guide
Naming Ionic Compounds
Check your Periodic Table of Elements to help you determine if the ion is positive or negative. The positive ion
is first and the negative ion is second. In addition, the compound will end in –ide. Write the compound name
on the line provided.
Oxygen and Sodium ____________________________________________
Bromine and Aluminum _________________________________________
5 Steps for Writing Ionic Compound Formulas
Remember: the metal is first and then the non-metal
1.
2.
3.
4.
5.
Write the symbols
Write the charges
Cross over the charges from top to bottom
Remove the charges
Simplify the numbers and remove the 1’s
Lithium fluoride ___________________________________
Beryllium chloride __________________________________
Terms to know
Subscripts are numbers used to tell you how many atoms of an element are in an equation
Coefficients give the number of molecules involved in a reaction
Reactant is what you start with in a chemical reaction
Product is what you end up with at the end of the reaction
2 K + 2 H2O -----> 2 KOH + H2
(reactant)
(product)
Counting Atoms
1) write down the different elements in each compound.
2) write down how many of that particular atom there are
3) remember to use the subscripts and coefficients correctly
4C3H5(NO3)3 _____________________________________________________________________________________ Total ______________
7(NH4)3PO4
_____________________________________________________________________________________ Total ______________
Write a Paragraph Description of
NaCl
Paragraph Description of Ionic Compounds
Make sure your description contains all of the following items.






Name the ionic compound
Explain how many atoms are in the compound. (the subscript)
Identify the metal and non-metal.
Explain how many valence electrons each element has.
Explain how the elements become stable once electrons have been taken.
Final statement should contain the terms stable, opposite charges, attraction.
Sodium chloride is an ionic compound. There is one atom of Sodium and one atom of Chlorine
which make up one complete molecule of Sodium chloride. Sodium is a metal and Chlorine is
a non-metal. Sodium has one valence electron and Chlorine has seven. Chlorine needs one
more electron to have eight and become balanced or, happy. Sodium needs to lose the one
valence electron to become happy. Once the valence electron has been lost by the metal and
gained by the non-metal, they become attracted due to the positive and negative charges.
Now they have combined to form a compound called Sodium Chloride.