2025-2026 Unit 2

a change in matter that produces a new substance

• physical change

• chemical change

• reactant

• atom

Tags

NGSS.MS-PS1-2

change that alters the physical properties of a substance without changing its identity

• chemical change

• physical change

• element

• product

Tags

NGSS.MS-PS1-4

a representation of a chemical reaction using chemical symbols, numbers, and a symbol →

• chemical equation

• physical change

• law of conservation of mass

• conserve

substances formed during a chemical reaction, found on the right side of the equation

• product

• reactant

• element

• atom

substances that react in a chemical reaction, found on the left side of the equation

• product

• reactant

• conserve

• chemical reaction

the smallest unit of matter that retains the chemical identity of an element

• atom

• element

• physical change

• conserve

a pure substance composed of the same type of atom throughout

• element

• law of conservation of mass

• physical change

• reactant

the rearrangement of atoms to form new substances with different properties

• chemical reaction

• physical change

• product

• atom

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

matter is not created or destroyed, only rearranged

• law of conservation of mass

• chemical change

• element

• product

Tags

NGSS.MS-PS1-5

to remain unchanged or constant

• conserve

• reactant

• atom

• element

Tags

NGSS.MS-PS1-5