Question

When a piece of clean magnesium ribbon is heated, it burns with a dazzling white flame, Magnesium oxide is formed and heat energy is liberated. This reaction is an example for

• A. Photochemical reaction
• B. Photochemical reaction and Endothermic reaction
• C. Exothermic reaction
• D. Photochemical Exothermic reaction reaction &Exothermic reaction

Answer 1

Answer:

C. Exothermic reaction

• An exothermic reaction is a chemical process that releases energy, typically in the form of heat, light, or sound.

• This energy release causes the temperature of the surroundings to increase.

• In an exothermic reaction, the energy content of the products is lower than that of the reactants. The difference in energy is released into the environment.

Magnesium Burning as an Example

• The burning of magnesium ribbon in air is a classic example of an exothermic reaction.

• When magnesium (Mg) reacts with oxygen (O₂) from the air, it forms magnesium oxide (MgO).

• The chemical equation for this reaction is: 2Mg(s) + O2(g) → 2MgO(s) + Heat

• The reaction is characterized by the emission of a dazzling white light and a significant amount of heat, indicating the release of energy.