Structure of Matter

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the chemical formula for methane?

Back

The chemical formula for methane is CH₄.

Front

What is the importance of the periodic table in chemistry?

Back

The periodic table organizes elements based on their atomic number and properties, helping to predict chemical behavior.

Front

How many atoms are in a molecule of NaCl?

Back

A molecule of NaCl contains one sodium atom and one chlorine atom.

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 hydrogen atoms are in 2CH₄?

Back

There are 8 hydrogen atoms in 2CH₄ (2 x 4 = 8).

Front

What is a molecule?

Back

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

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is made up of two or more atoms bonded together.

Front

What is the significance of the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes, reflecting the mass of protons and neutrons.

Front

What is a chemical bond?

Back

A chemical bond is a lasting attraction between atoms that enables the formation of chemical compounds.