The Equilibrium Constant Part I

This segment explains how to calculate the ratio of products to reactants and why this is important in the manufacture of chemicals for business. Students write equilibrium expressions and prepare to calculate equilibrium constant.

This segment explains how to calculate the ratio of products to reactants and why this is important in the manufacture of chemicals for business. Students write equilibrium expressions and prepare to calculate equilibrium constant.

Premiere Date: August 16, 2016 | Runtime: 00:06:22

## Toolkit

Unit 10B Note Taking Guide & Segment Questions

## Crosscutting Concepts

Patterns

Observed patterns of forms and events guide organization and classification, and they prompt questions about relationships and the factors that influence them.

Scale, Proportion, and Quantity

In considering phenomena, it is critical to recognize what is relevant at different measures of size, time, and energy and to recognize how changes in scale, proportion, or quantity affect a system’s structure or performance.

## Science & Engineering Practices

Generating a Hypothesis and Developing a Model

Modeling can begin in the earliest grades, with students’ models progressing from concrete “pictures” and/or physical scale models (e.g., a toy car) to more abstract representations of relevant relationships in later grades, such as a diagram representing forces on a particular object in a system. (NRC Framework, 2012, p. 58)

Using Mathematics and Computational Thinking

Although there are differences in how mathematics and computational thinking are applied in science and in engineering, mathematics often brings these two fields together by enabling engineers to apply the mathematical form of scientific theories and by enabling scientists to use powerful information technologies designed by engineers. Both kinds of professionals can thereby accomplish investigations and analyses and build complex models, which might otherwise be out of the question. (NRC Framework, 2012, p. 65)

## Vocabulary

chemical equilibrium - a state that is reached when the rate of the forward reaction equals the rate of the reverse reaction.

dynamic equilibrium - a state of equilibrium in which two opposing processes occur simultaneously with no net change.

equilibrium - a condition in which all acting influences are canceled by others, resulting in a stable, balanced, or unchanging system.

equilibrium constant (ksubeq) - the ratio of the concentration of products divided by the concentration of reactants.

Le Chatelier's Principle - a principle that states that when the equilibrium of a system is disturbed or stressed, the system adjusts to reestablish equilibrium by minimizing or countering the stress.

static equilibrum - a state of equilibrium in which no movement occurs.

The Haber Process - the process of synthesizing ammonia from nitrogen and hydrogen gases.

## Georgia Standards of Excellence

SC4Obtain, 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.aPlan and carry out an investigation to provide evidence of the effects of changing concentration, temperature, and pressure on chemical reactions. (Clarification statement: Pressure should not be tested experimentally.)

SC4.bConstruct an argument using collision theory and transition state theory to explain the role of activation energy in chemical reactions. (Clarification statement: Reaction coordinate diagrams could be used to visualize graphically changes in energy (direction flow and quantity) during the progress of a chemical reaction.)

SC4.dRefine the design of a chemical system by altering the conditions that would change forward and reverse rates and the amount of products at equilibrium. (Clarification statement: Emphasis is on the application of LeChatelier’s principle.)

## Request Teacher Toolkit

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