Counting Atoms

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the number and type of atoms in a molecule using symbols and numbers.

Front

How many elements are in the formula C6H12O6?

Back

3 (Carbon, Hydrogen, and Oxygen)

Front

What does the subscript in a chemical formula indicate?

Back

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

Front

How many total atoms are in the formula H2SO4?

Back

7 (2 Hydrogen, 1 Sulfur, 4 Oxygen)

Front

What is the total number of atoms in 4NH3?

Back

16 (4 x (1 Nitrogen + 3 Hydrogen) = 16 total atoms)

Front

Which element has the greatest number of atoms in AgNO3?

Back

Oxygen (3 Oxygen atoms)

Front

How many Carbon atoms are in the formula CO?

Back

1 Carbon atom.

Front

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

Back

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

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 is the formula for calculating the total number of atoms in a molecule?

Back

Add the number of atoms of each element in the chemical formula.