Overview
This lecture introduces the concept of reaction rate in chemistry, illustrated by the reaction between magnesium ribbon and hydrochloric acid.
Demonstration: Magnesium and Hydrochloric Acid
- A one molar (1 M) solution of hydrochloric acid (HCl) is used in the experiment.
- A small piece of magnesium ribbon is dropped into the HCl solution.
- The reaction produces visible fizzing, indicating a chemical reaction is occurring.
- The fizzing is due to the production of a gas as the reaction proceeds.
Introduction to Reaction Rate
- Reaction rate refers to how quickly a chemical reaction occurs.
- Observing the speed of fizzing provides a visual clue about the rate of the reaction.
- Reaction rate can be measured by tracking how fast reactants are consumed or products are formed.
Key Terms & Definitions
- Reaction Rate — The speed at which reactants are converted to products in a chemical reaction.
- Hydrochloric Acid (HCl) — A strong acid used in the demonstration.
- Magnesium Ribbon — A strip of magnesium metal that reacts with HCl.
- Product Gas — The fizzing observed is the release of a gas (typically hydrogen) as a product.
Action Items / Next Steps
- Review the concept of reaction rate and observe similar reactions in your laboratory manual.
- Read the upcoming chapter on factors affecting reaction rates.