MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances

interact to determine if a chemical reaction has occurred.  [

Clarification Statement: Examples of

reactions could include burning sugar or steel wool, fat reacting with sodium hydroxide, and mixing zinc

with hydrogen chloride.] [Assessment boundary: Assessment is limited to analysis of the following

properties: density, melting point, boiling point, solubility, flammability, and odor.]

MS-PS1-5. Develop and use a model to describe how the total number of atoms does not change in a

chemical reaction, and thus mass is conserved.

[Clarification Statement: Emphasis is on law of

conservation of matter and on physical models or drawings, including digital forms, that represent

atoms.] [Assessment Boundary: Assessment does not include the use of atomic masses, balancing

symbolic equations, or intermolecular forces.]