Atoms vs Molecules: Key Concepts and Differences

What is the smallest unit of a wall?

• Cement

• Brick

• Sand

• Paint

Which of the following is the smallest unit of a number?

• Sentence

• Word

• Letter

• Digit

What are the smallest units of salt?

• Oxygen and Nitrogen

• Sodium and Chlorine

• Hydrogen and Helium

• Carbon and Hydrogen

Which elements are the smallest units of sugar?

• Sodium and Chlorine

• Carbon, Hydrogen, and Oxygen

• Oxygen and Nitrogen

• Hydrogen and Helium

What is the smallest unit of any matter called?

• Atom

• Molecule

• Compound

• Element

Atoms are different from one another due to the number of what?

• Protons

• Nuclei

• Neutrons

• Electrons

What is formed when two or more atoms combine chemically?

• Element

• Compound

• Atom

• Molecule

Which of the following is a molecule of water?

• O2

• CO2

• NH3

• H2O

How many atoms of oxygen are in a molecule of carbon dioxide?

• Three

• Four

• One

• Two

What is the smallest unit of any metal?

• Atom

• Molecule

• Compound

• Element