Alkaline Earth Science Lab Report

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					                   Reactivity of Alkaline Earth Metals

Background
Alkaline Earth metals are a special vertical group of metals on the left side
of the periodic chart. Groups tend to have periodic trends as you move up
and down the periodic chart. One periodic trend is the ability to become
more or less reactive when they are mixed with chemicals. Some special
negative groups of atoms are called polyatomic ions. They work as a group
when they reactive with atoms. Examples of three polyatomic elements are:
carbonate, sulfate, and chromate. There are is several types of observations
we can make when chemicals react. We often can see gas productions, color
change or cloudiness we call a precipitant. Atoms react because their outer
or valance electrons do not equal eight. The group number indicates the
number of valance electrons.

Objectives
-identify alkaline earth metals with their charges, valance electrons, and
ability to gain or lose electrons
-identify chemical reactions on the basis of observation
-analyze the periodic trend of reactivity going down the periodic chart as
-analyze the structure of an atom in relation to its number of valance
electrons and charge

Prelab:
Alkaline metal    outer electrons    charge      lost or gained electrons
Magnesium
Calcium
Strontium
Barium



Procedure
1.Place magnesium metal in three different wells.
2.Add carbonate, sulfate, and chromate to the metals.
3.Record your observations
4.Repeat steps 1-3 with the calcium, strontium, and barium metals.

Data Table
Alkaline metal             carbonate           sulfate              chromate
Magnesium
Calcium
Strontium
Barium


Analysis
1.Was there evidence of chemical reaction in any of the spots and if so
explain:

2.Which alkaline earth metal formed the smallest number of precipitates?

3.Which alkaline earth metal formed the greatest number of precipitates?

4.What is the relationship between the number of precipitates formed and
the location of the alkaline earth element on the periodic table?

5.If the ability of an alkaline earth metal to form a precipitate is an indication
of its ability to chemically react with other substances, which is the most
reactive element?

6.List the alkaline earth metals in order of their chemical reactivity starting
with the most reactive:

				
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posted:9/13/2012
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