Atoms and Chemical Formulas

A combination of symbols and numbers that represent the number and types of elements (atoms) present in a compound, NaCl is an example.

• chemical formula

• coefficient

• reactant

• compound

Tags

NGSS.MS-PS1-1

What do we call a chemical substance made up of 2 or more different atoms?

• formula

• atom

• subscript

• molecule

Tags

NGSS.MS-PS1-1

What do we call a substance consisting of a single atom and identified by a capital letter?

• coefficient

• element

• compound

• molecule

Formulas written on the left side of the arrow symbol and are the starting substances or ingredients in a chemical reaction.

• subscript

• coefficient

• reactant

• product

A small number to the right of a symbol that is written below the normal line of letters to show how many atoms of an element are present in a substance.

• subscript

• coefficient

• reactant

• compound

A combination of symbols and chemical formulas used to describe what happens in a chemical reaction. It can include plus signs and an arrow.

• chemical formula

• chemical equation

• chemical reaction

• physical change

Tags

NGSS.MS-PS1-5

A number written in front of a chemical formula to show how many molecules of that substance are present.

• chemical formula

• coefficient

• reactant

• compound

An arrow symbol that shows a reaction has taken place.

• yield

• compound

• precipitate

• product

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Formulas written on the right side of the arrow symbol and are the new substances formed in a chemical reaction.

• subscript

• coefficient

• reactant

• product

The smallest unit of an element.

• atom

• element

• molecule

• compound

Tags

NGSS.MS-PS1-1