1.2d) Define a test tube. Draw its schematic diagram and write its one important use.

Definition:

A test tube is a small, cylindrical glass or plastic container used in laboratories to hold, mix, or heat small amounts of substances during experiments.

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Schematic Diagram:

         _______
        |       |
        |       | <-- Test Tube
        |       |
        |_______|
         /     \
        /       \
       |         |

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One Important Use:

Used for heating or mixing chemicals in small quantities during chemical reactions.

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