Chemistry Quiz: Elements and Molecules

What is an element?

• A type of molecule

• A fundamental substance that cannot be broken down

• A mixture of different substances

• A compound made of two or more atoms

How many known elements are there currently?

• 100

• 150

• 92

• 118

What is the atomic number of an element?

• The number of molecules in a compound

• The number of neutrons in the nucleus

• The number of protons in the nucleus

• The total number of electrons

Which of the following is a liquid at room temperature?

• Iron

• Helium

• Oxygen

• Water

What is the symbol for sodium?

• Sd

• S

• So

• Na

Which state of matter has tightly packed particles?

• Solid

• Gas

• Liquid

• Plasma

What are the three main subatomic particles?

• Solids, Liquids, Gases

• Hydrogen, Oxygen, Carbon

• Atoms, Molecules, Compounds

• Protons, Neutrons, Electrons

What is a molecule?

• A single atom

• A group of two or more atoms bonded together

• A mixture of different compounds

• A type of element

What is atomicity?

• The total mass of an element

• The number of atoms in a molecule

• The arrangement of electrons

• The number of protons in an atom

Which of the following is a diatomic molecule?

• H2O

• CO2

• O2

• NaCl