Effervescent

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Effervescence Experiments
6th grade lesson plan
Tim Braunsdorf and Doug Martin
NISMEC July 2010

Standard/Indicator
12. Investigate how the temperature and acidity of a solution influences the reaction rates, such as those involved in food spoilage.

Objective
Students will be able to describe the effects of the temperature of a solution on reaction rates and support their thinking using data from the investigation.

Guiding Question
How does the temperature of a solution affect a reaction rate?

Pre-planning
This lesson will have students investigating the effect of temperature on a simple chemical reaction, effervescent tablets bubbling in water. (Be sure to use uncoated tablets.) The students will design an experiment to test their hypotheses and gather data to create and support their conclusions. We will provide students with warm water, cold water, and room-temperature tap water. Students will have access to various probes, including the temperature probe. We expect students will measure the temperature of the different samples of water before adding the tablets. We will have a discussion with students about what they think those bubbles are prior to letting them design and conduct their experiments. Some may choose to measure CO2 as well, after this discussion.

Students will need to have a background in how to use these probes. In particular, if they want to use the CO2 gas sensor, they need to know that it takes some time to return to normal after a significant rise in CO2. They also need to know that it cannot be submersed in liquid or get wet.

GI Matrix

DLearner engages in scientific questions (From local to global questions.) ALearner gives priority to evidence
ALearner formulates answers based upon evidence
CLearner connects learning to other scientific information ALearner communicates and justifies conclusions

The Lesson

Hook/Anticipatory Set
We will have 2 test tubes, one with cold water and one...
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