Chemistry Check-in

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What is the Periodic Table of Elements?

Back

A tabular arrangement of chemical elements, organized by their atomic number, electron configuration, and recurring chemical properties.

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What is a compound?

Back

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

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What is a molecule?

Back

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

Front

What does atomic mass represent?

Back

The weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

How many protons does an element have if its atomic number is 8?

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8 protons, which corresponds to the element Oxygen (O).

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What is the difference between an element and a compound?

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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 bonded together.

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What is the atomic number of an element?

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The number of protons in the nucleus of an atom, which determines the element's identity.

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What is water (H2O) an example of?

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A compound, because it is made up of two different elements: hydrogen and oxygen.

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What is carbon dioxide (CO2)?

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A compound made of one carbon atom and two oxygen atoms, commonly produced during respiration.

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What is ammonia (NH3)?

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A compound consisting of one nitrogen atom and three hydrogen atoms, often used in fertilizers.