This performance activity is designed as an assessment for Grade 5 Physical Science 1-4 Next Generation Science Standards for Matter and Its Interactions.
Three substances (1) sodium bicarbonate (baking soda), (2) calcium chloride, and (3) phenol red solution are mixed in a Ziploc® bag. A reaction occurs that causes the substances in the bag to get warm, expand, and change color.
Note: Be sure to use Calcium Chloride CaCl2, not table salt.
5-PS1-4. Students will conduct an investigation to determine whether the mixing of two or more substances results in new substances.
First is a whole class activity as a review of new substances being formed. Then there is an individual assessment in which students conduct tests to discover which substances mixed together form the new substances. They collect data, analyze and interpret the data for evidence then justify the evidence.
Teaching tips, student recording pages, rubric for scoring, Teacher background, Science notes, and answer key are included.
A slideshow of the entire lesson can be viewed under the NGSS Assessments tab at http://scienceandkidsactivities.com