Elements, Atoms, Molecules and Compounds

Front

What is the basic unit of matter?

Back

An atom is the basic unit of matter.

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 next to each element symbol; if there is no subscript, it means there is only one atom of that element.

Front

What does a subscript in a chemical formula indicate?

Back

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

Front

How many elements are present in the formula C6H12O6?

Back

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

Front

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

Back

The coefficient indicates the number of molecules or moles of the compound.

Front

In the formula 10MgCl2, how many Magnesium atoms are present?

Back

There are 10 Magnesium atoms.

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 symbol for Oxygen?

Back

The chemical symbol for Oxygen is O.