In a chemical process, the atoms that make up the original substances are regrouped into different molecules, and these new substances have different properties from those of the reactants. Substances react chemically in characteristic ways.Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.Science knowledge is based upon logical and conceptual connections between evidence and explanations.ĭisciplinary Core Ideas PS1.A: Structure and Properties of Matter.
Scientific Knowledge is Based on Empirical Evidence
The performance expectation above was developed using the following elements from the NRC document A Framework for K-12 Science Education:Īnalyzing data in 6–8 builds on K–5 and progresses to extending quantitative analysis to investigations, distinguishing between correlation and causation, and basic statistical techniques of data and error analysis. Students who demonstrate understanding can:Īnalyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
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