Atoms and molecules

Avagadro's Constant

• 6.022*10²³

• 6.022*10^-23

• 6.023 *10²⁴

• 6.022*10

The chemical symbol for sodium is

• So

• Ium

• Na

• Ns

What is an element?

• A pure substance that cannot be broken down.

• Two atoms bonded together.

• Two or more different types of atoms bonded together.

• An molecule with an unequal distribution of charge.

What are atoms composed of?

• Protons and electrons.

• Protons, neutrons, and electrons.

• Neutrons and electrons.

• Ions, elements, and compounds.

What is a molecule?

• two elements bonded together (sharing electrons)

• a mixture of different substances

• smallest individual particles

• salt mixed in water

Which of the following is a chemical formula?

• H₂SO₄

• Si

• Hg

• C

What is the chemical symbol for the element mercury?

• Hg

• Merc

• MeC

• MY

How many total atoms are there in 2HNO₃?

• 2
• 6
• 8
• 10

What is the total number of atoms in an ammonia (NH₃) molecule?

• 1
• 2
• 3
• 4

What is the chemical symbol of the element Hydrogen?

• Hy

• H

• Hydro

• Hg