Stoichiometry

In a chemical reaction, the mass of reactants ___.

• is less than the mass of products

• is greater than the mass of products

• has no relationship to the mass of products

• is equal to the mass of products

Tags

NGSS.HS-PS1-7

Which of the following is a CORRECT interpretation of the balanced equation shown below?

• 22.4 L P₄ + 22.4 L O₂ -> 22.4 L P₂O₅

• 1 mol P₄ + 5 mol O₂ -> 2 mol P₂O₅

• 1 g P₄ + 5 g O₂ -> 2 g P₂O₅

• none of these

Tags

NGSS.HS-PS1-7

Which of the following is true about the total number of reactants and the total number of products in this reaction?

• 27 atoms of reactants chemically change into 34 atoms of products

• 27 liters of reactants chemically change into 34 liters of products

• 27 grams of reactants chemically change into 34 grams of products

• 27 moles of reactants chemically change into 34 moles of products

Tags

NGSS.HS-PS1-7

What is conserved during a chemical reaction?

• only mass

• only mass and moles

• only mass, moles, and volume

• only mass and volume

Tags

NGSS.HS-PS1-7

In the reaction below, what is the mole ratio of Cl₂ to AlCl₃?

• 2:2

• 1:2

• 3:2

• 2:3

Tags

NGSS.HS-PS1-7

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

• determining reagent

• excess reagent

• reactive reagent

• limiting reagent

The amount of product that could form during a reaction calculated from a balanced equation is

• unbelievable yield

• theoretical yield

• actual yield

• percent yield

The amount of product that forms when a reaction is carried out in the laboratory is known as the __.

• actual yield

• theoretical yield

• percent yield

• minimum yield

Given the following reaction, if copper remains after the lab is completed, what is the limiting reagent?

• Cu

• Ag

• CuNO₃

• AgNO₃

Tags

NGSS.HS-PS1-7

Given the following reaction, if copper remains after the lab is completed, what is the excess reagent?

• Cu

• Ag

• CuNO₃

• AgNO₃