Science STAAR

property of matter that can be observed without changing the composition or identity of the matter

• Physical property

• Periods

• Periodic Table

• Nucleus

• Neutron

a positively charged particle within the atomic nucleus; used to identify an element

• Proton

• Physical property

• Periods

• Periodic Table

• Nucleus

a particle smaller than an atom, such as a proton, neutron, or electron

• Subatomic particle

• Reactivity

• Proton

• Physical property

• Periods

electron(s) located in outer energy level (electron shell)

• Valence electron(s)

• Subatomic particle

• Reactivity

• Proton

• Physical property

the formation of a new substance with different properties; cannot be undone by physical means

• Chemical change

• Valence electron(s)

• Subatomic particle

• Reactivity

• Proton

Tags

NGSS.MS-PS1-2

a representation of a chemical reaction by symbols and numbers

• Chemical equation

• Chemical change

• Valence electron(s)

• Subatomic particle

• Reactivity

Tags

NGSS.MS-PS1-1

a representation of a molecule or compound in which the elements are represented by their symbols and subscripts represent the number of atoms of each element

• Chemical formula

• Chemical equation

• Chemical change

• Valence electron(s)

• Subatomic particle

Tags

NGSS.MS-PS1-1

a change caused by the interaction of two or more substances (reactants) resulting in the formation of new substances (products)

• Chemical reaction

• Chemical formula

• Chemical equation

• Chemical change

• Valence electron(s)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

the number placed in front of a chemical formula in a chemical equation; represents the number of molecules of that substance

• Coefficient

• Chemical reaction

• Chemical formula

• Chemical equation

• Chemical change

Tags

NGSS.MS-PS1-5

a substance made of two or more elements

• Compound

• Coefficient

• Chemical reaction

• Chemical formula

• Chemical equation

Tags

NGSS.MS-PS1-1