Practice Test for Mol

Stoichiometry is ____________ (choose all correct answers)

• A way to convert quantities of reactants & products within a

  chemical reaction.

• The best way to determine amount of substances

  involved in chemical reactions if at least 1 quantity

  from the reaction is known.

• The best way to determine the type of chemical reaction that has occurred.

• A way for conversions from a reactant or product to

  another reactant or product in the equation.

There are numerous units that can be used with stoichiometry conversions. Which units does this presentation cover (choose all correct units).

• gallons

• grams

• joules

• moles

If 2 mol of HCl react, how many moles of H₂ are obtained?

_____ moles H₂

If 4 mol of HCl react, how many mol of hydrogen gas are produced?

________________ moles of H₂

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)  
12.00 moles of NaClO₃ will produce how many grams of O₂?

• 256 g of O₂
• 576 g of O₂
• 288 g O₂

Tags

NGSS.HS-PS1-7

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O
 What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 13.8 g O₂
• 3.86 mol of O₂
• 124 g O₂

Tags

NGSS.HS-PS1-7

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

• 82%
• 0.82%
• 10.1 %
• 100%

Tags

NGSS.HS-PS1-7

4 Al + 3 O₂ –> 2 Al₂O₃  How much aluminum would be needed to completely react with 45 grams of O₂?

• 1.05 moles
• 3.75 moles
• 1.875 grams
• 1.875 moles

Tags

NGSS.HS-PS1-7

Actual yield must be determined by

• experiments
• calculations
• theoretical yield
• estimation

What is the theoretical yield?

• the maximum amount of product from a reaction
• the amount of product recovered from a lab experiment
• amount of product that causes the reaction to stop
• the amount of product needed to reverse the reaction

Tags

NGSS.HS-PS1-7