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With the information collected through the interviews, you will confirm some of the concepts, but you will also discover others with which you will obtain more tools or generate new knowledge. By doing this, you will be ready to carry out some experimental tests.

In the following guided activity, identify different compounds with the help of a conductivity meter.If you can't get one, you can make it. To do this, in assembly, gather the following materials:

Materials (per classroom)

20 cm of 12-gauge duplex cable ）Awatch battery type CR2032 3V ）Astraw A led light A pair of cutting pliers Insulation tape

Procedure

Remove, with the help of cutting pliers, the plastic from the ends of both sides of the cable.

2.Place a led terminal on one end of the wire and cover it with insulation tape.

Place the other led terminal on one pole of the battery, and the second cable, on the other pole. Tape the led terminal and the cable to the battery with insulation tape.

4.Make the tips of the end of the wire touch to turn on the led.

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