Lesson 4

Lesson Objectives...

• Conduct an investigation to produce data to serve as the basis for evidence to determine which combinations (patterns) of substances in a bath bomb cause bubbles of gas to appear (effect). 

• Construct and present a written and oral argument supported by citing empirical evidence and scientific reasoning that only certain combinations (patterns) of substances (water, baking soda, and citric) result (cause) in the formation of a gas (effect). 

• Apply scientific ideas and evidence (patterns in properties) to co-construct an explanation that the substance(s) in the gas bubbles must be a different substance(s) than the water, baking soda, or citric acid.

Resources for Lesson 4...

Preparing for our Investigation

Watch the video to understand how to set up the investigation you will be completing.

Combination of Ingredients (Substances) Investigation

Watch the video to record observations while combining different substances from a bath bomb.  Which combination of substances in a bath bomb produces a gas? 

What we figured out this lesson...

• Citric acid and baking soda are the only substances from the bath bomb that, when combined with water, cause gas bubbles to form.

• The gas(es) in the bubbles are substance(s) that are different from any of the substances we started with.