Question

1. Investigate philogistin theory.
2. Why a chemical reaction should be balanced one?
3. Why arrow is put between the reactants and products?​

Answer 1

Answer:

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Answer 2

Explanation:

The phlogiston theory was discredited by Antoine Lavoisier between 1770 and 1790. He studied the gain or loss of weight when tin, lead, phosphorus, and sulfur underwent reactions of oxidation or reduction (deoxidation); and he showed that the newly discovered element oxygen was always involved.

The chemical equation needs to be balanced so that it follows the law of conservation of mass. A balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side. Balancing chemical equations is a process of trial and error.

These arrows are used to show an equilibrium reaction where the longer arrow points to the side the reaction strongly favors. The top reaction shows the products are strongly favored over the reactants. The bottom reaction shows reactants are strongly favored over the products.