Defining Stoichiometry

You have 4.0 grams of AgNO3 and 3.5 grams of NaCl. Identify the limiting reactant in the following equation:
AgNO₃ + NaCl →AgCl + NaNO₃

• AgNO3
• NaCl
• AgCl
• NaNO3

Tags

NGSS.HS-PS1-7

What is the equation for percent yield?

• (Hypothetical yield)/(Actual yield)
• (Actual Yield)/(Hypothetical yield)

                                                                                                                                  Balance the equation: 
___Cr(OH)₃ + ___HClO₄ ⟶ ___Cr(ClO₄)₃ + ___H₂O

• 1 ; 3 ; 2 ; 3
• 0 ; 3 ; 0 ; 3
• 3 ; 0 ; 3 ; 0
• it's

Using the following equation:              Al + HCl →AlCl3 + H2              Find the amount of moles of HCl needed to react with 0.87 moles of Al. (Remember to Balance!)

• 2.6 mol HCl
• 3.2 mol HCl
• 2.8 mol HCl
• 2.45 mol HCl

The coefficients in a chemical equation represent the ______.

• Relative number of moles of reactants and products
• Masses in grams of all reactants and products
• Number of atoms of each element in each compound in a reaction
• Number of valence electrons involved in a reaction

Which of the following would not be studied within the topic of stoichiometry?

• The mole ratio of Al to Cl in the compound aluminum chloride
• The mass of carbon produced when a known mass of sucrose decomposes
• The number of moles of hydrogen that will react with a known quantity of oxygen
• The amount of energy required to break the ionic bonds in CaF2

Tags

NGSS.HS-PS1-7

The combustion of propane (C₃H₈) in excess oxygen yields CO₂ and H₂O:                                                                                                          C₃H₈ (g) + 5O₂ (g) --> 3CO₂ (g) + 4H₂O (g) When 2.5 mol O₂ is consumed in the reaction, __________ mol CO2 is produced.

• 1.5  
• 2.5
• 5.0
• 6.0

Tags

NGSS.HS-PS1-7

Calcium carbide (CaC₂) reacts with water to produce acetylene (C₂H₂) : CaC₂ (s) + 2H₂O (g)  Ca(OH)₂ (s) + C₂H₂ (g) Production of 13 g of C₂H₂ requires consumption of __________ g of H₂O.

• 9.0
• 18.0
• 4.5
• 4.8

A balanced chemical equation allows you to determine the ______.

• Mole ration of any two substances in the reaction
• Energy released in the reaction
• Electron configuration of all elements in the reaction
• Reaction mechanism involved in the reaction

Tags

NGSS.HS-PS1-7

What is stoichiometry?

• The study of plants and how they interact with their environments
• Geometrical analysis of solutions
• The study of the QUANTITATIVE relationships between reactants and products in a chemical reaction
• The study of the QUALITATIVE relationships between reactants and products in a chemical reaction