%Yield, Filtration, Limiting and Excess reagent Quiz

1. What is a limiting reagent?

• any reactant used up first in a reaction.
• any reactant left over at the end of a reaction.
• the maximum amount of product formed from a given amount of reactant.
• the purity of the reactant.

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
• 7

When 12 moles of O₂ reacts with 6 moles of C₁₀H₈, what is the limiting reactant?  
1 C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen
• C₁₀H₈
• Water
• Carbon Dioxide

Tags

NGSS.HS-PS1-7

8Fe + S₈ --> 8FeS

If 7.62 g Fe react with 8.67 g S₈, what is the limiting reactant?

• Fe

• S₈

• FeS

• none

4NH₃ + 5O₂ --> 4NO + 6H₂O

How many grams of NO are formed if 6.30 g of ammonia react with 1.80 g of oxygen?

• 0.270 g

• 0.0450 g

• 1.35 g

• 11.1 g

SO₂ + PCl₅ --> SOCl₂ + POCl₃

How much SOCl₂ is produced when 16.2 g SO₂ react with 13.7 g PCl_5?

• 7.83 g

• 30.1 g

• 26.4 g

• 19.8 g

Identify the limiting reagent when 6.00 moles HCl combines with 5.00 moles Mg to form MgCl₂.
 
1 Mg +  2 HCl --> 1 MgCl₂  +  1 H₂   
 

• Mg
• H₂
• MgCl₂
• HCl

Tags

NGSS.HS-PS1-7

C₃H₈ + 5O₂ --> 3CO₂ + 4H₂O

How much carbon dioxide is produced when 3.0 g of propane is burned in 2.1 g of oxygen?

• 1.7 g

• 0.035 g

• 2.9 g

• 9.0 g

You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich.  If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?

• bread
• jelly
• peanut butter
• sandwich

Tags

NGSS.HS-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.