Chemical Reactions and Stoichiometry

A model of a chemical reaction is shown. Which substance is the limiting reagent in the chemical reaction?

• Substance A

• Substance B

• Substance C

• Substance D

The products of the reaction CaF₂ + Br₂ → CaBr₂ + F₂ are formed by reacting calcium fluoride with bromine. If equal moles of each reactant were present, what would be the limiting reactant?

• F₂

• CaBr₂

• Br₂

• There is no limiting reactant.

Tags

NGSS.HS-PS1-7

For the equation SnO₂ + 2H₂ → Sn + 2H₂O, tin (IV) oxide reacts with excess hydrogen to produce tin and water. What is the limiting reactant?

• SnO₂

• H₂

• Sn

• H₂O

Tags

NGSS.HS-PS1-7

Which of the following is true of a limiting reagent? I. It is a reactant II. It limits the amount of product formed III. It determines the maximum amount of product formed.

• I only

• II only

• I and II

• I, II, and III

Which of the following methods can be used to determine the limiting reagent in an equation?

I. Compare the number of liters in each reactant

II. Compare the number moles of each reactant

III. Compare the amount of product each reactant will form

• I only

• II only

• I and III

• II and III

Iron and chlorine react to form iron(III) chloride as shown in this chemical equation: 2Fe + 3Cl₂ → 2FeCl₃ How many grams of chlorine gas are needed to react with 45.2 grams of iron?

• 32.0 grams

• 86.0 grams

• 64.0 grams

• 96.0 grams

Tags

NGSS.HS-PS1-7

• 12.6 grams

• 23.4 grams

• 28.9 grams

• 37.8 grams

Tags

NGSS.HS-PS1-7

• 3.0 mol

• 6.0 mol

• 12.0 mol

• 24.0 mol

A scientist fills a large, tightly sealed balloon with 75,000 mL of helium at STP. Using significant figures, how many moles of helium are contained within the balloon?

• 3.3 moles of helium

• 3,348 moles of helium

• 18 moles of helium

• 3.348 moles of helium

Tags

NGSS.HS-PS1-7