Stoichiometry

What is stoichiometry?

• The study of how the quantities of reactants and products are related in chemical reactions
• The study of the speed of reactions
• The study of how chemical reactions occur
• The study of types of reactions

Stoichiometry is based on the law of conservation of

• charge
• mass
• reactants
• volume

Tags

NGSS.HS-PS1-7

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

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

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

When two substances react to form products, the reactant which is used up is called the_____.

• excess reactant
• limiting reactant
• catalytic reactant
• determining reactant

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

What is Avogadro's Number?

• 602,000
• 23 x 10⁶
• 10 x 10²³
• 6.02 x 10²³

How many grams are in 7.8 moles of NaCl?

• 476grams
• 460 grams
• 452 grams
• 462 grams

Tags

NGSS.HS-PS1-7

How many moles of gas are in 56 L at standard temperature and pressure (STP)?

• 1.5 mol
• 2.0 mol
• 2.5 mol
• 2.25 mol