The brilliance with which magnesium burns makes it ideal for...

Name: Problem 6, Chapter 5: Introductory Chemistry: An Active Learning Approach
Uploaded: 2020-10-27T11:22:10-08:00
Duration: 2 min 30 s
Channel: Aadit Sharma
Description: The brilliance with which magnesium burns makes it ideal for use in marine flares and fireworks. Compare the mass of magnesium that burns with the mass of magnesium in the magnesium oxide ash that forms. Explain this in terms of atomic theory.

The brilliance with which magnesium burns makes it ideal for use in marine flares and fireworks. Compare the mass of magnesium that burns with the mass of magnesium in the magnesium oxide ash that forms. Explain this in terms of atomic theory.

Key Concepts

Stoichiometry

Stoichiometry involves the quantitative relationship between reactants and products in a chemical reaction. It explains that a fixed ratio of atoms, as determined by the balanced chemical equation, results in a predictable amount of product. In burning magnesium, stoichiometry tells us how many oxygen atoms combine with each magnesium atom to form magnesium oxide, thereby explaining the increased mass in the product.

Atomic Theory

Atomic theory provides the framework for understanding that all matter is made of atoms, each with a characteristic mass. When magnesium burns, its atoms chemically combine with oxygen atoms from the atmosphere; the added oxygen, which has its own atomic mass, contributes to the overall mass of the resulting magnesium oxide. Thus, the comparison between the mass of magnesium and the mass in magnesium oxide can be explained by the fact that atoms combine in fixed proportions based on their individual masses.

Conservation of Mass

This concept states that during a chemical reaction, the total mass of the reactants must equal the total mass of the products. Even though magnesium burns and transforms into magnesium oxide, any increase in mass in the product compared to the magnesium alone is due to the oxygen that has combined with it, rather than any loss or gain in mass overall.

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