Stoichiometry Unit Test

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation
• Panic
• Write an Unbalanced Equation
• Avogadro's Number

2H₂   +   O₂  →  2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles
• 8 moles
• 16 moles
• 2 moles

Tags

NGSS.HS-PS1-7

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6
• 2
• 3
• 1

In the reaction 2 H₂ + O₂ → 2 H₂O what is the mole ratio of oxygen to water?

• 1:2
• 2:1
• 3:4
• 4:3

Tags

NGSS.HS-PS1-7

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?

• 3mol Mg / 2 mol Fe

• 2 mol Mg / 3 mol Fe

• 1 mol Fe / 2 mol Fe

• 3 mol MgO / 2 mol Fe

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of Fe₂O₃ to moles Fe?

• 3mol Mg / 2 mol Fe
• 2 mol Mg/ 3 mol Fe
• 1 mol Fe₂O₃/ 2 mol Fe
• 3 mol MgO / 2 mol Fe

The coefficients in a chemical reaction represent the

• masses, in grams, of all reactions and products

• relative numbers of moles of reactants and products

• number of atoms in each compound in a reaction

• number of valence electrons involved in the reaction

A balanced chemical equation allows one to determine the

• mole ratio of any two substances in the reaction

• energy released in the reaction

• electron configuration of all elements in the reaction

• mechanism involved in the reaction

To balance a chemical equation, it may be necessary to adjust the

• coefficients

• subscripts

• formulas of the products

• number of products

A chemical equation is balanced when the

• coefficients of the reactants equal the coefficients of the products

• subscripts of the reactants equal the subscripts of the products

• products and reactants are the same chemicals

• same number of each kind of atom appears in the reactants and in the products

Tags

NGSS.HS-PS1-7