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Reaction Rate Lab Results and Catalysts

Students share their data and draw conclusions from the antacid tablet experiments and learn how catalysts affect reaction rates. The teacher discusses the behavior of gases at the macro and molecular level.

Students share their data and draw conclusions from the antacid tablet experiments and learn how catalysts affect reaction rates. The teacher discusses the behavior of gases at the macro and molecular level.

Premiere Date: August 28, 2016 | Runtime: 00:05:11

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Unit 9C Note Taking Guide & Segment Questions
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Crosscutting Concepts

Cause and Effect

Mechanism and explanation. Events have causes, sometimes simple, sometimes multifaceted. A major activity of science is investigating and explaining causal relationships and the mechanisms by which they are mediated. Such mechanisms can then be tested across given contexts and used to predict and explain events in new contexts.

Science & Engineering Practices

Analyzing and Interpreting Data

Once collected, data must be presented in a form that can reveal any patterns and relationships and that allows results to be communicated to others. Because raw data as such have little meaning, a major practice of scientists is to organize and interpret data through tabulating, graphing, or statistical analysis. Such analysis can bring out the meaning of data—and their relevance—so that they may be used as evidence.
Engineers, too, make decisions based on evidence that a given design will work; they rarely rely on trial and error. Engineers often analyze a design by creating a model or prototype and collecting extensive data on how it performs, including under extreme conditions. Analysis of this kind of data not only informs design decisions and enables the prediction or assessment of performance but also helps define or clarify problems, determine economic feasibility, evaluate alternatives, and investigate failures. (NRC Framework, 2012, p. 61-62)

Vocabulary

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. 

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.cConstruct an explanation of the effects of a catalyst on chemical reactions and apply it to everyday examples.

SC5Obtain, evaluate, and communicate information about the Kinetic Molecular Theory to model atomic and molecular motion in chemical and physical processes.

SC5.aPlan and carry out an investigation to calculate the amount of heat absorbed or released by chemical or physical processes. (Clarification statement: Calculation of the enthalpy, heat change, and Hess’s Law are addressed in this element.)

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