RB Chem Unit 6: Stoichiometry

Bubbles, color change, precipitate, heat release and mass change are all signs of what?

• physical change
• chemical change
• stoichiometry
• sludge

Avogadro's Number is

• 6.02 x 10²³
• 6.02 x 10²²
• 6.02 x 10²¹
• 6.02 x 10²⁰

A number of particles are measured in this unit.

• grams
• dozen
• years
• moles

When solving for molar mass, what tool in chemistry do you use?

• balance
• microwave
• periodic table
• ruler

The molar mass is the same as what other number?

• atomic number
• number of protons
• number of isotopes
• atomic mass

Use your Periodic table:
What is the molar mass of OXYGEN?

• 58
• 32
• 16
• 18

Use your Periodic table:
What is the molar mass of CO₂?

• 12
• 28
• 44
• 63

Use your Periodic table:
What is the molar mass of MgO?

• 12
• 28
• 44
• 63

Use your Periodic table:
What is the molar mass of N₂O₅?

• 100
• 110
• 108
• 109

What is the percent of Hydrogen in H₂O?

• 88%
• 100%
• 11%
• 89%