1. What Is Different About the Hydrogen Gas Model Compared to the Oxygen

Name ______Period _____ Element/Molecule Models Substance Formula Atom Name Number of Molecule Atoms Models

Hydrogen Gas H2

Oxygen Gas O2

Compound/Molecule Models Salt NaCl

Water H2O

Sodium Oxide Na2O

Sodium NaOH Hydroxide (Lye)

Methane CH4

Carbon CO2 Dioxide

Hydrochloric HCl Acid

1. What is different about the Hydrogen gas model compared to the oxygen gas model? ______2. What do you notice about the structures of the molecules? ______3. What does the formula tell about the molecule? ______4. What do the molecule model diagrams tell about the atoms that make up the molecule? ______5. How does the name of the substance relate to the name/s of the atoms? ______6. If given a formula, how would you know how many of each type of atom to use? ______7. What is the difference between an element molecule and a compound molecule? ______8. What does this show about the scale, proportion, and quantity of molecules? ______9. Water is made from hydrogen and oxygen, but it is very different from those two gases. What does this tell you about properties when atoms form to make molecules? ______10. Give a detailed definition of molecules given the information in the table. ______

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