Disciplinary Core Idea (DCI)

PS1 Matter and its Interactions – PS1.A Structure of Matter

• (3rd-5th) Because matter exists as particles that are too small to see, the matter is always conserved even if it seems to disappear. Measurements of a variety of observable properties can be used to identify particular materials.
• (6th-8th) The fact that matter is composed of atoms and molecules can be used to explain the properties of substances, diversity of materials, states of matter, phase changes, and conservation of matter.

Science & Engineering Practice (SEP) 

Asking Questions and Defining Problems

• (3rd-5th) Ask questions that can be investigated and predict reasonable outcomes based on patterns such as cause and effect relationships

Planning and Carrying Out Investigations

• (6th-8th) Conduct an investigation and/or evaluate and/or revise the experimental design to produce data to serve as the basis for evidence that meets the goals of the investigation.

Crosscutting Concept (CCC)

Structure and Function

• (3rd-5th) Different materials have different substructures, which can sometimes be observed.
• (6th-8th) Structures can be designed to serve particular functions by taking into account the properties of different materials, and how materials can be shaped and used.