Elements Molecules and Mixture Review 2024

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together. It can be made up of the same or different types of atoms.

Tags

NGSS.MS-PS1-1

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

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NGSS.MS-PS1-1

Front

Is ozone (O₃) a molecule or a compound?

Back

Ozone (O₃) is a molecule, but it is not a compound because it consists of only one type of element.

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NGSS.MS-PS1-1

Front

How many atoms are in a molecule of water (H₂O)?

Back

A molecule of water (H₂O) contains 3 atoms: 2 hydrogen atoms and 1 oxygen atom.

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NGSS.MS-PS1-1

Front

What does the subscript in a chemical formula indicate?

Back

The subscript in a chemical formula indicates the number of atoms of the element present in the molecule.

Front

How many oxygen atoms are in carbon dioxide (CO₂)?

Back

There are 2 oxygen atoms in carbon dioxide (CO₂).

Tags

NGSS.MS-PS1-1

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded.

Front

Can a molecule be both a compound and a molecule?

Back

Yes, a molecule can be both a compound and a molecule if it consists of two or more different elements.

Front

How many carbon atoms are in the compound C₂H₂?

Back

There are 2 carbon atoms in the compound C₂H₂.

Tags

NGSS.MS-PS1-1

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.