The correct answer to the question is option D. All of the above
Chemical equation is simply a representation of chemical reaction with symbols and formula of the reactants and products in the reaction.
All chemical equation must be balanced in order to comform to the law of conservation of matter (mass) which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
NOTE: Unbalanced chemical equation simply means that matter has been created or destroyed.
Now, with the above information in mind, let us answer the question given above.
Al + 2O₂ —> Al₂O₃
From the equation above, the following data were obtained:
Reactant:
Al = 1 atom
O = 4 atoms
Product:
Al = 2 atoms
O = 3 atoms
Observation:
1. The equation is not balanced as the number of atoms of the different elements in the reactants and product are not equal.
2. An atom of Al is created as the product contains 2 atoms of Al while the reactant contains only 1 atom.
3. An atom of O is destroyed as the reactant contains 4 atoms of O while the product contains 3 atoms.
4. Since the equation is unbalanced, it means the equation violates the law of conservation of matter (mass).
Thus, all the above makes the equation invalid.
Therefore, the correct answer to the question is option D.
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