DO NOW #27: LIMITING REACTANTS/%YIELD

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃.  If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

• AlCl3
• Cl2
• Al

Tags

NGSS.MS-PS1-5

When does a chemical reaction stop?

• When the lab is finished
• When the excess reactant is used up
• When the limiting reactant is used up
• Chemical reactions never stop

What is the limiting reactant if 10 moles of NH₃  react  with 30.0 moles of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

• NH₃
• NO
• N₂
• water

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

1 Cheese + 2 Bread --> 1 grilled cheese

How many grilled cheeses can you make with 26 slices of bread and 14 pieces of cheese?

• 14

• 13

• 26

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈ what is the limiting reactant?  C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen
• C₁₀H₈
• Water
• Carbon Dioxide

Tags

NGSS.MS-PS1-5

1 Body + 4 Tires --> 1 car
How many cars can you make with 92 tires and 34 bodies? 

• 23
• 34
• 68
• 46

What is the conversion factor that allows you to convert from substance A to substance B?

• Mole ratio

• Avogadro's number

• 22.4 L

• the mass of the substance

Which mole ratio is correct for the given chemical equation?

2N₂ (g) + 5O₂ (g) -----> 2N₂O₅ (g)

• 2 mol N₂ to 5 mol N₂O₅

• 2 mol N₂ to 2 mol N₂O₅

• 5 mol O₂ to 2 mol NO₂

• None are correct.

Tags

NGSS.HS-PS1-7

The excess reactant is not completely used up during the reaction.

• True

• False

Tags

NGSS.HS-PS1-7