Understanding Atoms and Elements

What are the basic building blocks of all matter?

• Molecules

• Atoms

• Compounds

• Cells

Which of the following is made up of only one type of atom?

• Water

• Air

• Gold

• Salt

What is the chemical formula for water?

• H2O

• O2

• CO2

• NaCl

What does the term 'microscopic' refer to?

• Something visible to the naked eye

• Something very large

• Something very small

• Something invisible

What does 'macroscopic' mean?

• Invisible

• Visible to the naked eye

• Visible only with a microscope

• Extremely small