Counting Atoms

Front

What is a subscript in a chemical formula?

Back

A small number below an element symbol that indicates the number of atoms of that element in a molecule.

Front

If there is no subscript next to an element symbol, how many atoms of that element are present?

Back

Only 1 atom.

Front

Which of the following is NOT a compound: H2Cr, Cr3, OH, PNi?

Back

Cr3 is NOT a compound.

Front

How many atoms of Oxygen are in the compound H2O?

Back

1 atom of Oxygen.

Front

How many TOTAL atoms are in the compound H2C3O4N5?

Back

14 total atoms.

Front

What does the formula H2O represent?

Back

Water, consisting of 2 hydrogen atoms and 1 oxygen atom.

Front

What is the significance of the coefficients in a chemical formula?

Back

Coefficients indicate the number of molecules or moles of a compound.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What does the term 'molecule' refer to?

Back

A molecule is a group of two or more atoms bonded together.

Front

How do you determine the number of atoms in a compound like C6H12O6?

Back

Add the subscripts: 6 (C) + 12 (H) + 6 (O) = 24 total atoms.