Separate physical and chemical changes
Separate physical and chemical changes using supplied evidence and a solved model.
About 25 minutes, plus any extended practice
Open lesson 1Chemical Reactions and Properties
Use particle evidence and material boundaries to reason about reactions.
Before you begin
- Read or listen to supplied scientific descriptions and follow a labeled diagram.
- Use division, fractions, percentages and stated measurement units.
Choose by skill rather than age alone. Read with an adult when useful, revisit a lesson, or explore another grade.
Follow the lesson sequence
Close a reaction mass boundary
Close a reaction mass boundary using supplied evidence and a solved model.
About 25 minutes, plus any extended practice
Open lesson 2Interpret particle rearrangement
Interpret particle rearrangement using supplied evidence and a solved model.
About 25 minutes, plus any extended practice
Open lesson 3Read an energy-change claim
Read an energy-change claim using supplied evidence and a solved model.
About 25 minutes, plus any extended practice
Open lesson 4Review and transfer
After the lessons, try 4 new review cases and a practical task. Each answer has an explanation and a link back to the related lesson.
Open the unit reviewGuest answers are temporary. Keep your own paper or document; this unit does not certify completion or record a school grade.
Topic references
- NGSS topic reference: topic reference — Chemical Reactions and Properties; original supplementary instruction, not a certified alignment claim.
These references informed the topic selection. They do not certify complete standards alignment.