I made ScienceFix.com to share my favorite demos that I do in my middle school science classes.  

Contact Me
Search ScienceFix.com
Media that I like...
  • Something Funny Happened on the Way to the Moon
    Something Funny Happened on the Way to the Moon
    by Sara Howard
  • NOVA - Origins
    NOVA - Origins
    starring Neil Degrasse Tyson
  • Human Body: Pushing the Limits
    Human Body: Pushing the Limits
    starring Bray Poor
« Video Demo: Colorful Water Electrolysis | Main | The Reverse Balloon »

Reaction Bag

This is a lesson that I got from another teacher, who I think got it from Science Gems. My eighth graders have to learn what chemical reactions are and how to recognize them. Our textbook describes 5 types of evidence that a chemical occurred. They are color change, temperature change, gas production, precipitation and change in properties (like smell , taste, texture, etc.). In this lesson students have to look for which types of evidence occur when calcium chloride, sodium bicarbonate, and phenol red solution are mixed together. What is really cool about this lesson is that students get to feel the reaction. The chemical reaction takes place in a sealed plastic bag. It inflates because carbon dioxide gas is produced, it gets very hot, it changes from a red color to a yellow color (the carbon dioxide makes the liquid acidic), and the smell at the end is a chalk smell (calcium carbonate). Download the student handout and view the quicktime video (or Google Video) and pictures on how the lesson works.

Materials needed

Tips: Emphasize to the students to feel the solid chemicals immediately after all chemicals are mixed together so they are able to sense the temperature change.

PrintView Printer Friendly Version

EmailEmail Article to Friend

References (8)

References allow you to track sources for this article, as well as articles that were written in response to this article.
  • Response
  • Response
  • Response
    Happy Hug Day Wishes | Happy Hug Day Messages for Him / Her | Happy Hug Day SMS in English, Hindi | Happy Hug Day 2016 Quotes for ...
  • Response
    Response: The Atlantic
    Jean Knight Archives
  • Response
    When I am in school these chemical reaction look good to me because that the first time in lab. And seeing different types of chemicals and when any two chemical we get another chemical. There I enjoyed very much being in chemistry lab. In later on it became my favorite subject ...
  • Response
  • Response
    Response: Buy Degree
    In science subject teacher teach learners with theory and then describe everything with practical by which they can easily fathom it, but day to day higher study is more expensive to the learner cause of it mostly guys had to leave it, but now they have an opportunity to continue higher ...
  • Response
    Response: bug out bag

Reader Comments

There are no comments for this journal entry. To create a new comment, use the form below.

PostPost a New Comment

Enter your information below to add a new comment.

My response is on my own website »
Author Email (optional):
Author URL (optional):
Some HTML allowed: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <code> <em> <i> <strike> <strong>