Professor Bill Tyson introduces the concept of molecules, explaining how atoms join to form them. He distinguishes between simple and compound substances, using oxygen and water as examples. The video also covers covalent bonds, where atoms share electrons to form substances. The session concludes with a call to action for viewers to like the video and follow the channel.

What is formed when two or more atoms join together?

• A molecule

• A compound

• A mixture

• An element

Which of the following is a simple substance?

• Salt

• Oxygen

• Water

• Carbon dioxide

What is a compound substance?

• A substance that cannot be broken down

• A substance made of different types of atoms

• A substance that is always a gas

• A substance made of one type of atom

How do atoms form a covalent bond?

• By transferring electrons

• By gaining electrons

• By sharing electrons

• By losing electrons

What do atoms love to share in a covalent bond?

• Protons

• Nuclei

• Electrons

• Neutrons

Why do atoms need to unite and share?

• To become more stable

• To become less reactive

• To become something bigger

• To become smaller