Question 1

The limiting reactant is a reactant that

Accepted Answer

is used up first.

Answer

speeds up the rate of a reaction.

Answer

the reactant that is left over.

Question 2

Use the equation 2Na + Cl2 --> 2NaCl.  If 2 moles of sodium and 2 moles of chlorine gas reacts with each other, which is the limiting reactant?

Accepted Answer

Na

Answer

NaCl

Answer

Cl2

Question 3

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

Accepted Answer

oxygen

Answer

H2O

Answer

CO2

Answer

C10H8

Question 4

N2  + 3H2   -->  2 NH3  If 20g of nitrogen gas reacts with 10g of hydrogen gas, which would be the limiting reactant?

Accepted Answer

nitrogen gas

Answer

hydrogen gas

Answer

ammonia

Question 5

C3H8   +    5O2  -->  4H2O  +   3CO2. Which is the limiting reactant?

Accepted Answer

propane C3H8

Answer

carbon dioxide

Answer

oxygen gas

Answer

water

Question 6

4FeCl3 + 3O2 --> 2Fe2O3 + 6Cl2.  How many moles of chlorine gas can be produced from 4 moles of iron (III) chloride and 4 moles of oxygen gas? (Hint: Identify the limiting reagent first.)

Accepted Answer

6

Answer

12

Answer

8

Answer

24

Question 7

4FeCl3 + 3O2 --> 2Fe2O3 + 6Cl2.  How many moles of iron (III) oxide can be produced from 5 moles of iron (III) chloride and 6 moles of oxygen gas? (Hint: Identify the limiting reagent first.)

Accepted Answer

2.5

Answer

6

Answer

4

Answer

3

Question 8

Zinc and sulphur react to form zinc sulphide according to the equation.

______ Zn   +    S   --------->    ZnS

If  25.0 g of zinc and 30.0 g of sulphur are mixed, 
   which chemical is the limiting reactant?

Accepted Answer

Zn

Answer

ZnS

Answer

S

Question 9

Ca   +    S   --------->    CaS

If  32.0 g of calcium and 37.0 g of sulfur are mixed, 
   which chemical is the limiting reactant?

Accepted Answer

Ca

Answer

S

Answer

CaS

Question 10

The reactant that is not completely used up in a chemical reaction is called the __________ .

Accepted Answer

excess reactant

Answer

limiting reactant

Answer

catalyst

Answer

spectator ion

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