Download Deconstructed HS-PS1-2

Moving NGSS to Instruction
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What is the intent of the performance expectation/learning?
What are the key concepts for learning?
What will students need to know or do to show mastery?
HS-PS1-2
Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms,
trends in the periodic table, and knowledge of the patterns of chemical properties.[Clarification Statement: Examples of chemical reactions
could include the reaction of sodium and chlorine, of carbon and oxygen, or of carbon and hydrogen.] [Assessment Boundary: Assessment is limited
to chemical reactions involving main group elements and combustion reactions.]
Knowledge
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Know and apply rules governing chemical
reactions.
Reasoning AND Skill/Performance*
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Distinguish between how element properties progress
among families (vertical/patterns) compared to across
families (horizontal/trend) on the periodic table.
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Determine an element’s valence state by identifying the
number of electrons in the outer shell rather than
number of electrons needed to fill the shell.
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Understand types of chemical bond and how
they form.
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Explain how valence states of atoms
determined.
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Identify rules for writing empirical chemical
formulas.
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Construct a balanced chemical equation, meaning an
equation with not net charge.
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Recognize that balanced chemical equations
represent conservation of matter.
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Apply knowledge of valence electrons to develop
balanced chemical equations.
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Know the structure of the periodic table.
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Recognize basic atomic structure.
Draw conclusions/determine the chemical properties of
an element (reactivity, electronegativity, valence, etc.)
based on its position on the periodic table.
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Know that electrons are organized in orbital
shells in accordance with a known set of rules.
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Understand that electronegativity describes
the tendency of an element to attract electrons
to it.
*Refers to type of target
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