Counting Atoms

Front

What is the definition of an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is a molecule?

Back

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

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

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

Back

Count the subscripts in the formula; if there is no subscript, it is assumed to be 1.

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

What is the chemical formula for water?

Back

H2O, which indicates 2 hydrogen atoms and 1 oxygen atom.

Front

How many elements are present in the chemical formula H2SO4?

Back

There are 3 elements: Hydrogen (H), Sulfur (S), and Oxygen (O).

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 chemical formula for glucose?

Back

C6H12O6.

Front

How many more oxygen atoms are in MgSO4 compared to magnesium?

Back

There are 3 more oxygen atoms than magnesium in MgSO4.