Stoichiometry

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield
• mole ratio
• actual yield
• percentage yield

Tags

NGSS.HS-PS1-7

What is the measured amount of a product obtained from a chemical reaction?

• mole ratio
• theoretical yield
• percentage yield
• actual yield

Tags

NGSS.HS-PS1-7

Mole ratios are obtained from the

• balanced chemical equation

• periodic table

• molar mass

• reactant's electron configuration

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

The limiting reactant

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

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

• spectator reagent

• limiting reagent

• excess reagent

• catalyst

What is the first thing you must do to solve a stoichiometry problem?

• write a balanced equation

• panic without a periodic table

• write a balanced electron configuration

• count the number of molecules in the equation

Tags

NGSS.HS-PS1-7

The equation for percent yield is:

• (theoretical/experimental) X 100

• (experimental/theoretical) X 100

• (experimental - theoretical)/ theoretical X 100

• (theoretical - experimental)/ theoretical X 100

True or False. You must convert grams to moles to do stoichiometry.

• True
• False

Tags

NGSS.HS-PS1-7

Balance Equation:

2 KClO₃ → 2 KCl + 3 O₂

How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol

• 20.1 mol

• 10.1 mol

• 4.5 mol