Counting Atoms

Front

What does the subscript in a chemical formula tell you?

Back

It tells you how many atoms of that element are present.

Front

Which chemical formula correctly displays 1 atom of Ni, and 2 atoms of F?

Back

NiF₂

Front

Molecules that are made of more than one type of atom are called?

Back

Compounds.

Front

How many carbon atoms are in the formula 2Na₂CO₃?

Back

2

Front

A subscript is the small number below a(n) ________ that tells the number of _______ of that element.

Back

element symbol; atoms.

Front

What is a chemical formula?

Back

A representation of a substance using symbols for its constituent elements.

Front

What does the coefficient in a chemical formula indicate?

Back

It indicates the number of molecules or moles of that compound.

Front

What is the difference between an element and a compound?

Back

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.

Front

What is the significance of parentheses in a chemical formula?

Back

Parentheses indicate that the atoms inside are grouped together and the subscript outside applies to all atoms within the parentheses.

Front

How do you determine the total number of atoms in a chemical formula?

Back

Add the number of atoms of each element, taking into account the coefficients and subscripts.