What is a molecule?

• A group of two or more atoms held together by chemical bonds

• A mixture of different elements

• A single atom

• A compound with multiple chemical bonds

Which of the following is an example of a molecule?

• Oxygen

• Carbon dioxide

• Sodium chloride

• Water

What is a compound?

• A mixture of different elements

• A substance that contains two or more different elements with chemical bonds

• A group of two or more atoms held together by chemical bonds

• A single atom

Which of the following is an example of a compound?

• Nitrogen

• Oxygen

• Sodium chloride

• Helium

What is the formula for water?

• O2

• H2O

• HO

• H2

What is the formula for carbon dioxide?

• CO

• C2O

• CO2

• C2O2

What is the formula for sulfuric acid?

• SO4

• HSO4

• H2SO4

• H2S

Which type of bond forms large substances rather than molecules?

• Ionic bond

• Hydrogen bond

• Metallic bond

• Covalent bond

What is a mixture?

• A single substance with chemical bonds

• Two or more substances physically mixed together

• A compound with multiple chemical bonds

• Two or more substances chemically combined together

How can mixtures be easily separated?

• Using chemical reactions

• By adding more substances

• Using physical methods like filtration, crystallization, or distillation

• By heating to high temperatures