DE Science Elementary “5-Minute Prep” ForChanging Matter Changes to Matter > Chemical Changes
Chemical Changes – The Big Ideas • Chemical changes, called reactions, produce substances with different properties than the original substances. • Chemical changes are often difficult to reverse. • Chemical changes can happen quickly or slowly. • Chemical changes to matter can be produced by heating. • Light energy can produce a chemical change in some materials. • Sometimes when two substances combine, energy is released.
Chemical Changes – Prior Knowledge Students have been interacting with matter since birth and have witnessed chemical changes, but the concepts of chemical changes are new to students. It will be helpful for students to review chemical changes with the Fun-damental, Things that Change. It will also be helpful for students if they have: • experience baking something. • observed a log on fire.
Chemical Changes – Common Misconceptions • Conservation of particles does not occur during a chemical change. • Reality: Conservation of mass does occur during chemical changes even though the physical appearance of the substances may have drastically changed. • After chemical change, the original substances are perceived as remaining even though they are altered. • Reality: The chemical changes has produced a new substance with different properties than the original substances.
Chemical Changes – Using DE Science Content When you close this presentation, you can review the following recommended resources for Chemical Changes. • Exploration: Chemical Changes • Reading Passage: Keep it in the Dark • Video: Chemical Changes • Video: Chemical Reactions Use the PowerPoint version of this presentation for hyperlinks to these resources or you can get to them through the browser or search feature.
Chemical Changes – Instructional Ideas • Perform a demonstration of pouring a liquid and a solid together for a chemical reaction. (Vinegar and baking soda will produce a reaction.) • Have each student write a demo memo in their student science notebooks of what they have just observed, what type of reaction occurred, and why.
Chemical Changes – Instructional Ideas • Use a chemical changes KWL chart with the class. • Have the class complete what they Know about chemical changes. • Then, perform brief demonstrations of at least one chemical change and ask the students to complete Want to know column of the chart. • Use the answers to guide your instruction for various lessons on chemical changes, which might include completing the Exploration: Chemical Changes either individually or in pairs of students. • Finally, as the class concludes each lesson, students should summarize in one sentence what they have Learned and write it in the last column of the KWL chart.
State standards: If you wish to review your state standards regarding Chemical Changes, click here to get to the curriculum standards search feature of DES. http://discoveryeducation.com/forward/curriculum.cfm You can click on any standard to see what resources are available to teach it. Additional Information: For additional content, check the Extend section within the concept.