Chemical Formulas and Reactions

One or two letters used to represent an element

• Atomic Mass

• Symbol(s)

• Atomic Number

• Name

When substances interact to form one or more NEW substances with different properties than the original substances.

• chemical reaction

• physical reaction

• reactant

• product

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A combination of chemical formulas used to describe what happens in a chemical reaction.

• chemical formula

• arrow

• chemical equation

• coefficient

Tags

NGSS.MS-PS1-5

Formulas written on the LEFT side of the arrow symbol (→) are the starting substances in a chemical reaction.

• Reactant

• "Yields"

• Product

• Subscript

Formulas written on the RIGHT side of the arrow symbol (→) are the new substances formed in a chemical reaction.

• Reactant

• "Yields"

• Product

• Atom

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

An arrow symbol that shows a reaction has taken place.

• Reactant

• Product

• "Yields"

• Coefficient

A ______________ is a substance composed of two or more elements chemically combined and in a definite proportion

• product

• element

• atom

• compound

A change in which the characteristics of a substance are only changed physically and the original properties stay the same.

• physical change

• chemical change

• compound

• coefficient

A change in which a substance (or substances) is changed into one or more new substances with different properties than the original substances

• physical change

• chemical change

• compound

• chemical formula

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

unexpected color-change is a sign of a

• physical change
• reactant
• chemical change
• yield

Tags

NGSS.MS-PS1-2