Atoms, Elements, Molecules, Compounds

Front

What is the definition of an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is a substance formed when two or more elements chemically bond together.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements.

Tags

NGSS.MS-PS1-1

Front

Is H2O a molecule or a compound?

Back

H2O is both a molecule and a compound.

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NGSS.MS-PS1-1

Front

What does it mean for a substance to be a compound?

Back

A compound is a substance formed from two or more different elements that are chemically bonded.

Tags

NGSS.MS-PS1-1

Front

Can a molecule be made up of only one type of atom?

Back

Yes, a molecule can consist of only one type of atom, such as O2 (oxygen gas), which is a molecule but not a compound.

Tags

NGSS.MS-PS1-1

Front

What is the significance of the ball and stick model in chemistry?

Back

The ball and stick model visually represents the arrangement of atoms in a molecule and the bonds between them.

Tags

NGSS.MS-PS1-1

Front

What does the 'stick' in a ball and stick model represent?

Back

The 'stick' represents the chemical bonds or attractions between atoms.

Front

Are all molecules also compounds?

Back

No, not all molecules are compounds; only those that consist of two or more different elements are compounds.

Tags

NGSS.MS-PS1-1

Front

What is an example of a compound?

Back

An example of a compound is sodium chloride (NaCl), which is formed from sodium and chlorine.

Tags

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