# Segment A: Reaction Rates

Unit 9 introduces kinetics and looks at how molecular motion affects gases. Students learn about collision theory and reaction rates. The teacher demonstrates how substances react with each other, using an antacid tablet immersed in water. The students design their own antacid tablet experiment to determine which conditions create the fastest rate of reaction.

## Segment A: Reaction Rates

Segment A: Reaction Rates

Unit 9 introduces kinetics and looks at how molecular motion affects gases. Students learn about collision theory and reaction rates. The teacher demonstrates how substances react with each other, using an antacid tablet immersed in water. The students design their own antacid tablet experiment to determine which conditions create the fastest rate of reaction.

### Science

SC4

Obtain, evaluate, and communicate information about how to refine the design of a chemical system by applying engineering principles to manipulate the factors that affect a chemical reaction.

SC4.a

Plan and carry out an investigation to provide evidence of the effects of changing concentration, temperature, and pressure on chemical reactions.

SC4.b

Construct an argument using collision theory and transition state theory to explain the role of activation energy in chemical reactions.

SC5

Obtain, evaluate, and communicate information about the Kinetic Molecular Theory to model atomic and molecular motion in chemical and physical processes.

SC5.a

Plan and carry out an investigation to calculate the amount of heat absorbed or released by chemical or physical processes.

activation energy - the minimum amount of energy that reactants must possess in order to undergo a specific reaction.

catalyst - a substance that provides a lower energy pathway for reactants to convert to products without getting used up or changing itself.

collision theory - a theory that states that particles must collide in order to react.

effective collision - collisions that result in a successful reaction.

ideal gas - gas that follows the behavior described by kinetic molecular theory.

ineffective collision - collisions that do not result in a successful reaction.

kinetic energy - the energy of motion.

kinetic molecular theory - A theory of the thermodynamic behavior of matter, especially the relationships among pressure, volume, and temperature in gases, based on the dependence of temperature on the kinetic energy of the particles of a substance.

reaction rate - the change in concentration of a reactant or product over time.

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