Mole Ratios, Limiting and Excess Reactant

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

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NGSS.HS-PS1-7

A reactant that remains after a chemical reaction stops

• stoichiometry
• mole ratio
• excess reactant
• limiting reactant

The limiting reactant

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

What is a limiting reactant?

• the reactant that determines how much product can be made
• the reactant that is in excess
• the product that you can make the most of
• the amount of reactants that react with each other

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NGSS.HS-PS1-7

NGSS.HS-PS1-6

The coefficients in a chemical equation represent the

• number of atoms in each compound in a reaction
• relative numbers of moles of reactants and products
• masses, in grams, of all reactants and products
• number of valence electrons involved in the reaction

To determine the limiting reactant in a chemical reaction, one must know the

• amount of product formed
• available amount of one of the reactants
• available amount of each of each reactant
• speed of the reaction

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NGSS.HS-PS1-7

Mole ratios are obtained from the ________________.

• balanced chemical equation
• molar masses
• periodic table
• subscripts

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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

In the equation 2 Al₂O₃ --> 4 Al + 3 O₂, what is the mole ratio of aluminum to oxygen?

• 10:6

• 3:4

• 4:3

• 2:3

Tags

NGSS.HS-PS1-7