ELEMENTS   &   COMPOUNDS USED IN EVERYDAY LIVING - ASSESSMENT # 1

Objective:  Find examples of elements in your daily living.

     PERCENTAGE COMPOSITION OF ELEMENTS

Element	Earth Crust	Water	Air	Biosphere	Human

H	   2.92	66.4	-	49.8	63
O	60.4	33	21	24.9	25.5
C	  0.16	  0.0014	 0.03	24.9	  9.5
N	-	-	78.3	  0.27	  1.4
Ca	  1.88	  0.006	-	  0.073	  0.31
K	  1.37	  0.006	-	  0.046	  0.06
Si	20.5	-	-	  0.033	>0.01
Mg	  1.77	  0.034	-	  0.031	  0.01
P	  0.08	-	-	  0.03	  0.22
S	  0.04	  0.017	-	  0.017	  0.05
Al	  6.2	-	-	  0.016	-
Na	  2.49	  0.28	-	-	  0.03
Fe	  1.9	-	-	-	>0.01
Cl	-	  0.33	-	-	  0.03

Twenty four Elements essential for life:  All of the above except for Al.  Also including vanadium, chromium, manganese, cobalt, copper, zinc, molybdenum, tin, iodine, selenium, and fluorine.

QUES. 1:  Which four elements (names and symbols) make up the majority of the substances in the biosphere and human life?

     ELEMENT INVENTORY:  Find examples of as  many elements and compounds as possible in the entire Periodic Table.  Do not make duplicates in element names or symbols, but make a fairly exhaustive listing because we will use the list for several activities such as writing the formula.  Each element may be listed only once, even though you may find it numerous times.  Make the following Element Inventory Table:

Common substance;  Chemical name;  Element Name;  Symbol;  Element Count

Water		 - 	Hydrogen	H	1
			Oxygen	O	2
Air		oxygen & nitrogen	Nitrogen	N	3

On the far right side make a final element count of only one example of each element.  For example in water are the elements hydrogen and oxygen.  In air, oxygen is also found, but do not list it a second time, list nitrogen instead.

Places to look for elements:  food ingredient lists, household products, cosmetics, over the counter drugs, hardware store, garden store-fertilizers, and common knowledge (chemical name may be left blank, if not written out and unknown).
QUES. 2:  Choose TWO of any of the elements except H, O, C.  Use the text book or a Science encyclopedia to find as much as possible of the following information.  Natural source of the element, products made with the element or uses of the element, any other interesting details.  Write a short report to summarize your findings.  Be prepared to share your findings with other classmates on an informal basis. 

CLASSIFICATION OF MATTER

     For this IN-CLASS ACTIVITY, you will need the completed Element Inventory.   

QUES. 3:   First write very brief definitions of the following terms.  These are found in the appropriate sections of the textbook or have been discussed in lecture.  Second, use the lists of compounds, elements, and ingredients lists to find the examples of the following terms. 

MATTER

THREE STATES OF MATTER

MIXTURE

SOLUTION

HOMOGENEOUS MIXTURE

HETEROGENEOUS MIXTURE

ELEMENT

ATOM

COMPOUND

MOLECULE (of a compound and of an element)

PURE SUBSTANCE (both an element and a compound)

PHYSICAL PROPERTIES

CHEMICAL PROPERTIES

PHYSICAL CHANGE

CHEMICAL CHANGE
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