Elements vs. Compounds

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together. Compounds have unique properties that differ from the individual elements.

Front

How can you identify an element from its chemical formula?

Back

If the chemical formula consists of only one type of atom (e.g., He, O₂), it is an element.

Front

How can you identify a compound from its chemical formula?

Back

If the chemical formula contains two or more different types of atoms (e.g., Na₂O, H₂O), it is a compound.

Front

What is the chemical formula for a diatomic element?

Back

Diatomic elements consist of two atoms of the same element bonded together, such as O₂ (oxygen) or N₂ (nitrogen).

Front

What is the significance of subscripts in a chemical formula?

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Subscripts indicate the number of atoms of each element in a compound. For example, in H₂O, the subscript '2' indicates there are two hydrogen atoms.

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What is the difference between a molecule and a compound?

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A molecule is a group of two or more atoms bonded together, which can be of the same or different elements. A compound is specifically a molecule that contains at least two different elements.

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How many elements are in the compound F₃CO₂?

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There are three different elements in F₃CO₂: fluorine (F), carbon (C), and oxygen (O).

Front

What is a pure substance?

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A pure substance is a material that has a constant composition and consistent properties throughout. Elements and compounds are both considered pure substances.

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Can a compound be broken down into simpler substances?

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Yes, compounds can be broken down into their constituent elements or simpler compounds through chemical reactions.