What should we do when transferring a solution from a test tube to another using a dropper? (1) Use a new dropper every time we transfer the same solution in an experiment.
(2) Hold the dropper upside down to avoid any leakage.
(3) Dispose of the unused solution in the test tube.​

3 is right

Explanation:

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(2) Hold the dropper upside down to avoid any leakage.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

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