Elements and Compounds

The smallest particle of matter is

• element

• cell

• atom

• compound

Anything that has mass and takes up space is called ____

Answer explanation

Matter is everything!!! All solids, liquids, and gases

An element is a ____ that is made up of only one type of atom.

• pure substance

• mixture

• compound

• chemical

A(n) ___ is a substance made of two or more elements that are chemically combined in a fixed ratio.

• element

• compound

• atom

• nucleus

Tags

NGSS.MS-PS1-1

Is water (H₂O) an element or compound?

Answer explanation

Water is a compound because it contains two different elements - hydrogen and oxygen.

Tags

NGSS.MS-PS1-1

How are elements and compounds different?

• Elements are pure substances but compounds are not.

• Elements are always larger units of matter, and compounds are smaller.

• Compounds are represented by chemical symbols of one letter, while elements are represented by symbols of two letters.

• A compound is represented by a chemical formula, while elements are represented by a chemical symbol.

Hydrogen is considered an element, while hydrogen peroxide is considered a compound. This is because hydrogen peroxide is....

• a liquid

• used for cleaning wounds

• made of two different elements

• useful to humans

Tags

NGSS.MS-PS1-1

An element consists of how many types of atoms?

Compounds are formed when

• two or more atoms bond together

• atoms break apart

• one atom exists

• more than two atoms mix together

Tags

NGSS.MS-PS1-1

Is this an element, atom, or compound?

• element

• atom

• compound

Answer explanation

This is compound carbon dioxide, which is the gas we breathe out and the gas I made in class yesterday in the demo. It is made of two elements: carbon and oxygen.