All molecules are compounds, but not all compounds are molecules.

• TRUE

• FALSE

Tags

NGSS.MS-PS1-1

Two or more different atoms that are chemically combined form a ____.

Tags

NGSS.MS-PS1-1

A ____ ____ is made of only one kind of particle and has a fixed structure. Examples are an individual element or a molecule like H2O because their formulas are always the same.

• mixed substance
• elemental compound
• compound mixture
• pure substance

Pure substances cannot be broken down into anything simpler.

• TRUE

• FALSE

Extended structures are unique because they

• are complicated

• have a specific ratio of atoms

• don't have a specific ratio of atoms

• contain atoms

Tags

NGSS.MS-PS1-1

Select all compounds from the list below.

• HCl

• C6H12O6

• Br2

• O3

Tags

NGSS.MS-PS1-1

A varied number of one or more kinds of atom bonded together in a large network is called a(n) ____.

• Molecule

• Compound

• Extended Structure

• Life Cycle

Tags

NGSS.MS-PS1-1

Salt and diamond are examples of extended structures.

• True

• False

Tags

NGSS.MS-PS1-1

The more compact (denser) the atoms in a substance are, the more likely it is a liquid.

• TRUE

• FALSE

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-4

The polymer polyethylene is made of ______ known as ethylene.

• Polymers

• Perimeters

• Mermaids

• Monomers

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-3