Chemical Reactions

Anything that has mass (weight) and takes up space. Everything around you, like air, water, and rocks, is made of matter.

• Element

• Molecules

• Matter

• Compound

Tags

NGSS.MS-PS1-4

Basic substances that cannot be broken down into simpler substances. They are the building blocks of everything, like oxygen and gold.

• Matter

• Elements

• Atoms

• Molecules

Tags

NGSS.MS-PS1-1

The smallest unit of an element that still has the properties of that element. Atoms are like tiny building blocks of matter.

• Matter

• Elements

• Atoms

• Molecules

Tags

NGSS.MS-PS1-1

Two or more atoms joined together. For example, a molecule of water is made of two hydrogen atoms and one oxygen atom.

• Matter

• Elements

• Atoms

• Molecules

Tags

NGSS.MS-PS1-1

• A substance made when two or more different elements are chemically combined. Water is a compound made of hydrogen and oxygen.

• Compound

• Matter

• Elements

• Molecules

Tags

NGSS.MS-PS1-1

The number of protons in the nucleus of an atom, which determines the element.

• Elements

• Compound

• Molecules

• Atomic Number

A tiny particle in the nucleus (center) of an atom that has a positive charge.

• Proton

• Electron

• Neutron

• Compound

A tiny particle that moves around the nucleus of an atom and has a negative charge.

• Proton

• Electron

• Neutron

• Compound

A tiny particle in the nucleus of an atom that has no charge (neutral).

• Proton

• Electron

• Neutron

• Compound

A way of writing what elements are in a compound and how many atoms of each element there are. For example, the chemical formula for water is H₂O, which shows there are two hydrogen atoms and one oxygen atom.

• Compound

• Chemical Formula

• Mixture

• Atomic Number

Tags

NGSS.MS-PS1-1