Review- Elements, compounds, chemical formulas

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements and numbers to indicate the quantity of each element.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript in a chemical formula indicates the number of atoms of the element that are present in one molecule of the compound.

Front

What is the difference between an element and a compound?

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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, representing the smallest fundamental unit of a chemical compound.

Front

What is the chemical formula for carbon dioxide?

Back

The chemical formula for carbon dioxide is CO2, which indicates it consists of one carbon atom and two oxygen atoms.

Front

How many atoms are in one molecule of glucose (C6H12O6)?

Back

One molecule of glucose consists of 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

Front

What is the significance of the number in front of a chemical formula (e.g., 2 in 2H2O)?

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The number in front of a chemical formula indicates how many molecules of that compound are present.

Front

What is the chemical formula for 2-heptanone?

Back

The chemical formula for 2-heptanone is C7H14O.

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How many hydrogen atoms are in one molecule of 2-heptanone (C7H14O)?

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One molecule of 2-heptanone contains 14 hydrogen atoms.

Front

What is the chemical formula for phosphoric acid?

Back

The chemical formula for phosphoric acid is H3PO4.