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Limiting and Excess Reagents

Authored by Mona Blieble

Chemistry

11th Grade

Used 11+ times

Limiting and Excess Reagents
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9 questions

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1.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

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

2.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

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

3.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

The limiting reactant . . .

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

4.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

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
None

5.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

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.

6.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

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

7.

MULTIPLE CHOICE QUESTION

15 mins • 1 pt

4. If the quantities of reactants are given in units other than moles, what is the first step for determining the amount of product?

Determine the amount of product from the given amount of limiting reagent.
Convert each given quantity of reactant to moles.
Identify the limiting reagent.

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