Stoichiometry Practice Test

A reactant in a chemical reaction that is used up first is the _____________.

• theoretical yield

• actual yield

• limited reactant

• excess reactant

The calculated product in a chemical reaction of the limited reactant is the _____________.

• theoretical yield

• actual yield

• limited reactant

• excess reactant

Tags

NGSS.HS-PS1-7

The true amount of the product produced in the chemical reaction during a lab setting.

• limited reactant

• actual yield

• percent yield

• theoretical yield

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-7

A reactant that remains after a chemical reaction stops

• stoichiometry
• mole ratio
• excess reactant
• limiting reactant

Tags

NGSS.HS-PS1-7

Balance this equation:

H₂ + Cl₂ ---> HCl

• It is balanced.

• H₂ + Cl₂ ---> 2HCl

• 3H₂ + Cl₂ ---> 6HCl

• H₂ + 3Cl₂ ---> 6HCl

Tags

NGSS.HS-PS1-7

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation?   P₄O₁₀ + 6 H₂O --> 4 H₃PO₄ 

• 6:4
• 4:6
• 1:3
• 3:1

Tags

NGSS.HS-PS1-7

Using the balanced equation in question 1,
Mg(s)   +   2HCl(aq)  -->   MgCl₂(aq)   + H₂(g)
How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂?

• 3.8 moles
• 15 moles
• 7.5 moles
• 23 moles

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.HS-PS1-7

SO₂ + PCl₅ --> SOCl₂ + POCl₃

What is the theoretical yield of SOCl₂ when 16.2g SO₂ react with 13.7g PCl_5?  (The equation is already balanced.)

Molar Mass: SO₂ = 64.07 g/mol & PCl₅ = 208.24 g/mol

& SOCl₂ = 118.97 g/mol

• 7.83g

• 30.1g

• 26.4g

• 19.8g 

Tags

NGSS.HS-PS1-7

SO₂ + PCl₅ --> SOCl₂ + POCl₃

How many grams are are left of the excess reactant when when 16.2g SO₂ reacts with 13.7g PCl₅?

Molar Mass: SO₂ = 64.07 g/mol & PCl₅ = 208.24 g/mol

& SOCl₂ = 118.97 g/mol

• 7.8 g

• 12.0 g

• 30.1 g

• 4.3 g

Tags

NGSS.HS-PS1-7