Limiting Reactants and Excess in Reactions

The video tutorial explains the concept of limiting reactants using metaphors and real-life examples. It covers the stoichiometry involved in determining limiting and excess reactants, and the amount of product formed. The tutorial includes a lab example with glycerol and potassium permanganate, a molecular level explanation, and practice problems using both moles and mass. The video aims to help students understand how to calculate limiting reactants and excess reactants in chemical reactions.

What is the limiting reactant in the sandwich metaphor if you have 19 pieces of bread and 2 slices of salami?

• Both are limiting

• Neither is limiting

• Bread

• Salami

In the lab example, which reactant was found to be in excess?

• Neither was in excess

• Both were in excess

• Potassium permanganate

• Glycerol

When hydrogen and oxygen react to form water, which reactant is in excess if more hydrogen is added?

• Neither is in excess

• Oxygen

• Both are in excess

• Hydrogen

In the smoothie recipe example, what is the limiting reactant if you have 180 bananas and 512 strawberries?

• Bananas

• Neither is limiting

• Strawberries

• Both are limiting

How many smoothies can be made with 180 bananas and 512 strawberries?

• 64

• 72

• 80

• 60

In the first practice problem, how many moles of ammonia can be produced from 21 moles of hydrogen and 8 moles of nitrogen?

• 20 moles

• 16 moles

• 14 moles

• 18 moles

Which reactant is limiting in the reaction between aluminum and hydrochloric acid?

• Both are limiting

• Aluminum

• Neither is limiting

• Hydrochloric acid

How much aluminum is left over in the reaction with hydrochloric acid?

• 5.2 grams

• 4.5 grams

• 3.8 grams

• 6.0 grams

In the final practice problem, what is the limiting reactant when reacting 60.1 grams of oxygen with 15 grams of ammonia?

• Oxygen

• Ammonia

• Both are limiting

• Neither is limiting

How much water is produced in the reaction between oxygen and ammonia?

• 30.0 grams

• 27.5 grams

• 25.0 grams

• 23.8 grams