Chemical formula

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a compound using symbols for the elements and numerical subscripts to indicate the number of atoms of each element.

Front

How many elements are represented in the compound Na2CO3?

Back

3

Front

What type of bond is present in calcium chloride (CaCl2)?

Back

Ionic bond.

Front

How many total atoms are in a molecule of sulfur trioxide (SO3)?

Back

4

Front

Which of the following is not a compound: Cl, NaCl, or H2O?

Back

Cl.

Front

How many different elements are present in sodium chloride (NaCl)?

Back

2

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the compound.

Front

What is the difference between an element and a compound?

Back

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 the chemical formula for water?

Back

H2O.

Front

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

Back

Coefficients indicate the number of molecules or moles of a compound in a chemical reaction.