24 Task Cards with Reading Passage align with NGSS Physical Science (2-PS1-4and PS1.B) on Chemical Reactions and Material Changes. These cover the basics of how changes in matter can be reversible and irreversible. This is an excellent introduction to the basic ideas of Chemistry and Chemical Reactions.Heating and cooling a substance may cause changes that can be observed. Sometimes these changes are reversible, and sometimes they are not. Examples, boiling water, cooking an egg, or baking cook