6th Grade Science Guide

6.2: Matter & Energy 3 Dimensions & Progressions

Unit 3

with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms. ●​ Solids may be formed from molecules, or they may be extended structures with repeating subunits (e.g., crystals). ●​ Gases and liquids are made of molecules or inert atoms that are moving about relative to each other. ●​ In a liquid, the molecules are constantly in contact with others; in a gas, they are widely spaced except when they happen to collide. In a solid, atoms are closely spaced and may vibrate in position but do not change relative locations. ●​ The changes of state that occur with variations in temperature or pressure can be described and predicted using these models of matter.

models. ●​ SEP 3: Planning and carrying out investigations. Cross Cutting Concepts ●​ CCC 2: Cause and effect ●​ CCC 3: Scale,

proportion and quantity

K-12 LEARNING SEQUENCE

K-2

3-5

9-12

●​ Matter exists as different substances that have observable different properties. ●​ Different properties are suited to different purposes. ●​ Objects can be built up from smaller parts.

●​ Because matter exists as particles that are

●​ The sub-atomic structural model and interactions between electric charges at the atomic scale can be used to explain the structure and interactions of matter, including chemical reactions and nuclear processes. ●​ Repeating patterns of the periodic table reflect patterns of outer electrons. A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy to take the molecule apart.

too small to see, matter is always

conserved even if it seems to disappear. ●​ Measurements of a variety of observable properties can be used to identify particular materials.