Question

The reaction, 4Fe (s) + 3O2 (g) à 2 Fe2O3 (s), is the rusting of iron. What occurs as the reaction proceeds? a precipitate is formed the color of the solid will change a new odor is given off the solution bubbles

Answer 1

Answer: the color of the solid will change

Explanation:

A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: Oxidation of iron to ferric oxide is a chemical change.

$4Fe(s)+3O_2(g)\rightarrow Fe_2O_3(s)$

Here iron which is grey in color changes first to green and then turns brownish red.

Characteristics of a chemical reaction:

1. change in color

2. heat is gained or lost

3. evolution of gas

4. formation of precipitate

Answer 2

The reaction, 4Fe (s) + 3O2 (g) -> 2 Fe2O3 (s), is the rusting of iron. As the reaction proceeds, the color of the solid will change due to the reacction of iron with air. The rest of the choices do not answer the question above.