Atoms and Molecules Quiz

What is the smallest particle of an element?

• Molecule

• Atom

• Compound

• Electron

Why is it difficult to see an individual atom?

• They are hidden inside molecules

• They move too fast

• They are transparent

• They are too small to be seen even with a microscope

What is a molecule?

• A single atom

• A particle smaller than an atom

• Two or more atoms chemically bonded together

• A type of element

What is the chemical formula for water?

• O2H

• HO2

• H2O

• H2

What are pure gold bars made of?

• Gold and oxygen atoms

• Gold and carbon atoms

• Only gold atoms

• A mixture of gold and silver atoms

What is the difference between an atom and a molecule?

• An atom is larger than a molecule

• An atom is the smallest particle of an element, while a molecule is made of two or more atoms chemically bonded together

• A molecule is smaller than an atom

• An atom is made of molecules

What is the chemical formula for carbon dioxide?

• CO

• C2O

• C2O2

• CO2

What is the main component of the air we breathe?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Hydrogen

What is the chemical symbol for sodium?

• Na

• So

• Sn

• Sa