Bags Of Reaction Lab

A Bagged Chemical Reaction

SSS:
SC.A.1.4.4 The student experiments and determines that the rates of reaction among atoms and molecules depend on the concentration, pressure, andtemperature of the reactants and the presence or absence of catalysts.

Purpose of Lab/Activity:
• Observe the changes associated with a chemical reaction including heat changes, changes in anindicator, bubble of gas released.
• Determine which compounds are reactants and which are products through the use of a chemical equation.
• Use indicators in order to identify whethera solution is acidic or basic.

Prerequisite: Prior to this activity the student should be able to:
• Identify the reactants and the products of a chemical reaction
• Describe thechanges that can evidence that a reaction has taken place.

Materials (individual or per group):
• Safety goggles & Lab apron
• Calcium chloride pellets (CaCl2)
• Baking soda,sodium bicarbonate (NaHCO3)
• Phenol red solution (acid/base indicator solution)
• Measuring cup or graduated cylinder
• 2 plastic teaspoons
• Plastic cup
• 1-gallonZiploc-type bag
• 2 twist ties or rubber bands
• Water

Procedures: Day of Activity
|Before activity: |What the teacher will do:|
| |Help clarify misconceptions:|
| |Lead students to acknowledge that when a chemical reaction takes place new substances are formed as particles are rearranged. |
||Guide a class discussion on identifying types of evidence that a chemical reaction has taken place. Many students think that all|
| |chemical reactions are exothermic....