Atoms and Molecules

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

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Front

What is a molecule?

Back

A group of two or more atoms bonded together.

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Front

What is a compound?

Back

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

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Front

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

Back

2 (Hydrogen and Oxygen).

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Front

How many atoms are in a molecule of methane (CH4)?

Back

5 (1 Carbon atom and 4 Hydrogen atoms).

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Front

Is carbon dioxide (CO2) a molecule or a compound?

Back

It is both a molecule and a compound.

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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.

Front

What does the 'H' in H2O represent?

Back

Hydrogen, which is one of the elements in water.

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Front

What does the 'O' in H2O represent?

Back

Oxygen, which is the other element in water.

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Front

Can a molecule be made of the same type of atoms?

Back

Yes, for example, O2 (oxygen gas) is a molecule made of two oxygen atoms.

Tags

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