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 do you count the number of elements in a chemical formula?

Back

Count the different chemical symbols present in the formula. Each unique symbol represents a different element.

Front

What do subscripts in a chemical formula indicate?

Back

Subscripts indicate the number of atoms of the element that are present in the molecule.

Front

What is the total number of atoms in a molecule represented by the formula H2O?

Back

There are 3 atoms in total: 2 Hydrogen atoms and 1 Oxygen atom.

Front

How many different elements are in the formula C6H12O6?

Back

There are 3 different elements: Carbon (C), Hydrogen (H), and Oxygen (O).

Front

What is the difference between coefficients and subscripts in a chemical formula?

Back

Coefficients indicate the number of molecules, while subscripts indicate the number of atoms of each element in a molecule.

Front

How many atoms of Oxygen are in the formula H2SO4?

Back

There are 4 Oxygen atoms in H2SO4.

Front

If a chemical formula has a subscript of 3 next to an element, what does that mean?

Back

It means there are 3 atoms of that element in the molecule.

Front

What is the total number of atoms in the formula NaHCO3?

Back

There are 4 atoms in total: 1 Sodium (Na), 1 Hydrogen (H), 1 Carbon (C), and 3 Oxygen (O) atoms.

Front

How many atoms are in the formula C2H5OH?

Back

There are 9 atoms in total: 2 Carbon (C), 6 Hydrogen (H), and 1 Oxygen (O) atom.