When does a chemical reaction stop?

When the limiting reactant is used up

When the excess reactant is used up

Look at the "Before" picture of your given reactants. Balance the equation and determine from the picture which reactant is your limiting reactant.

The reactants run out at the same time.

What is percent yield?

The ratio of the actual yield to the theoretical yield, multiplied by 100%.

The percentage of the reactant that remains unreacted.

The percentage of the product that decomposes during the reaction.

The ratio of the theoretical reactant to the theoretical yield, multiplied by 100%.

What happens to the excess reagent after the reaction has gone to completion?

It remains in the reaction mixture.

It continues to react until it is also consumed.

It is automatically converted into the product.

In a reaction where A reacts with B to form C, if increasing the amount of A does not increase the amount of C produced, what does this indicate about A?

A is not involved in the reaction.

A is completely consumed before B.

Using the diagram, determine the limiting reactant. (The product formed is water.)

none of the reactant are limiting

Review on Stoichiometry Quiz

34 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

CH₄ + 2O₂ --> 2H₂O + CO₂What is the mass of CO₂ can be produced when 35g of O₂ reacts?

1.09 g

24.1 g

28.2 g

44.0 g

N₂ + 3 H₂ → 2 NH₃
How many moles of NH₃ can be formed from 1.00 mole of H₂?

4.00 moles

0.333 moles

0.667moles

6.00 moles

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from 6 moles H₂?

4 moles Fe

6 moles Fe

9 moles Fe

2 moles Fe

The limiting reactant

slows the reaction down

is used up first

is the reactant that is left over

controls the speed of the reaction

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

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

6.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

N₂ + 3H₂ → 2NH₃
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

6

2

3

1

7.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

1.16%

116%

85%

76%

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Review on Stoichiometry

CH₄ + 2O₂ --> 2H₂O + CO₂What is the mass of CO₂ can be produced when 35g of O₂ reacts?

N₂ + 3 H₂ → 2 NH₃
How many moles of NH₃ can be formed from 1.00 mole of H₂?

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from 6 moles H₂?

The limiting 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?

N₂ + 3H₂ → 2NH₃
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

A reaction was predicted to produce 32.4 grams of a compound. When the product was measured, there were only 26.1 grams made. What is the percent yield?

H₂ + Cl₂ → 2 HCl
Which is the limiting reactant if equal grams of H₂ and Cl₂ react? (if this is hard for you to imagine, make up a number for your grams and work the problem!)

N₂ + 3 H₂ → 2 NH₃
Which is the limiting reactant if equal moles of N₂ and H₂ react? (if this is hard for you to imagine, make up a number for moles and work the problems!)

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Review on Stoichiometry

CH4 + 2O2 --> 2H2O + CO2What is the mass of CO2 can be produced when 35g of O2 reacts?

N2 + 3 H2 → 2 NH3How many moles of NH3 can be formed from 1.00 mole of H2?

Using the following equation:Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)How many moles of iron can be made from 6 moles H2?

The limiting reactant

1 Cheese + 2 Bread --> 1 Grilled cheeseHow many grilled cheeses can you make with 26 slices of bread and 14 pieces of cheese?

N2 + 3H2 → 2NH3 How many moles of hydrogen are needed to react with 2 moles of nitrogen?

Theoretical yield = 73gActual yield = 62gCalculate the percent yield.

A reaction was predicted to produce 32.4 grams of a compound. When the product was measured, there were only 26.1 grams made. What is the percent yield?

H2 + Cl2 → 2 HClWhich is the limiting reactant if equal grams of H2 and Cl2 react? (if this is hard for you to imagine, make up a number for your grams and work the problem!)

N2 + 3 H2 → 2 NH3Which is the limiting reactant if equal moles of N2 and H2 react? (if this is hard for you to imagine, make up a number for moles and work the problems!)

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CH₄ + 2O₂ --> 2H₂O + CO₂What is the mass of CO₂ can be produced when 35g of O₂ reacts?

N₂ + 3 H₂ → 2 NH₃
How many moles of NH₃ can be formed from 1.00 mole of H₂?

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from 6 moles H₂?

1 Cheese + 2 Bread --> 1 Grilled cheese
How many grilled cheeses can you make with 26 slices of bread and 14 pieces of cheese?

N₂ + 3H₂ → 2NH₃
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

H₂ + Cl₂ → 2 HCl
Which is the limiting reactant if equal grams of H₂ and Cl₂ react? (if this is hard for you to imagine, make up a number for your grams and work the problem!)

N₂ + 3 H₂ → 2 NH₃
Which is the limiting reactant if equal moles of N₂ and H₂ react? (if this is hard for you to imagine, make up a number for moles and work the problems!)