dijous, 29 de maig del 2008

WATER POLLUTION












Water pollution means one or more substances have built up in water to such and extent that they cause problems for animals or people. Oceans, lakes, rivers and other inland waters can naturally clean up a certain amount of pollution by dispersing in hamerssly.The water pollution could affect the health of all the plants, animals,and humans whose lives depend on the river.
Last day we study the germination of seeds in polluting agents.



The material is: x3 erlenmeyer or bottles, distilled water, petri sheet, paper, scissors, permanent marker,100 ml test-tube, lentils or soya seeds, one pipette and one pipum, polluting solution(Na OH, Nh3, Na Cl)one for each group



The procedure:



Take 10 ml of the polluting solution and put them in a test-tube. Fill it with distilled water up to 100 ml.Pour this solution into a new erlenmeyer(bottle) labeled "poluting 0.1".Take 10ml of the "poluting 0.1" solution and put them in a 100 ml test-tube.



Fill the test-tube with distilled water up to 100ml.Pour this solution into a new erlenmeyer(bottle) labeled "poluting 0.01".



How to prepare culture sheet:We take four petri sheets and we put paper in each one. After this we put 10 soya seeds in each petri sheet and we throw the polluting 1M (Nh3, NaOh, Na Cl), in other we throw the 0.1, in other the 0.01, and in the last petri sheet we throw distilled water.We want to wait for a week and in this moment we know what are the result.


dijous, 22 de maig del 2008

RECICLE OIL TO MAKE SOAP

Procedure

First step
--->Put 25 ml of recicled oil in one erlenmeyer(erlenmeyer nº 1)
Second step
--->Add 10 ml of distilled water in the erlenmeyer(erlenmeyer nº 1) and mix the oil whith the water
Third step
--->Weigh 4,5 g of "Na OH" (hydroxide sodium) and put it in a new erlenmeyer(erlenmeyer 2)
Fourth step
--->Take 15 ml of distilled water and put it in the erlenmeyer(erlenmeyer 2)
Fifth step
--->Mix the erlenmeyer 1 and the erlenmeyer 2
Sixth step
--->Put the mix of the two erlrenmeyers in a glass or in a container with the shape that you want and wait for 3-5 days
Seventh step
--->Take the soap and wash your hands!!!!








The objective of this worksheet is to make soap with recicled oil