Elements and Compounds Flashcard

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H) and oxygen (O).

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. An example is water (H2O), which is made of hydrogen and oxygen.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O.

Front

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

Back

There are 2 hydrogen atoms in one molecule of water (H2O).

Front

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

Back

There is 1 oxygen atom in one molecule of water (H2O).

Front

What is the chemical formula for carbon dioxide?

Back

The chemical formula for carbon dioxide is CO2.

Front

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

Back

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

Front

What is the chemical formula for methane?

Back

The chemical formula for methane is CH4.

Front

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

Back

There are 4 hydrogen atoms in one molecule of methane (CH4).

Front

What is the difference between an element and a compound?

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An element is a single type of atom, while a compound consists of two or more different types of atoms chemically bonded together.