Ch. 12.1 - The Arithmetic of Equations

Ch. 12.1

The Arithmetic of Equations

Multiple Choice

An apple pie needs 10 large apples, 2 crusts (top and bottom), and 1 tablespoon of cinnamon. Select the balanced equation that fits this situation.

• Ap₁₀ + Cr₂ + Ci --> Pi

• 10Ap + 2Cr + Ci --> Pi

• Ap + Cr + Ci --> Pi

• 10Ap + Cr₂ + 2Ci --> Pi

Multiple Choice

Two moles of potassium chloride and three moles of oxygena re produced from the decomposition of two moles of potassium chlorate, KClO₃(s). Select the balanced equation for this reaction.

• 2KClO₃ --> 2KCl + 3O₂

• 2KCl + 3O₂ --> 2KClO₃

• KClO₃ --> KCl + O₂

• KCl + O₂ --> KClO₃

Multiple Choice

Balance the following equation.

C₂H₂(g) + O₂(g) --> CO₂(g) + H₂O(g)

• C₂H₂(g) + O₂(g) --> 2CO₂(g) + H₂O(g)

• C₂H₂(g) + 2.5O₂(g) --> 2CO₂(g) + H₂O(g)

• C₂H₂(g) + O₂(g) --> CO₂(g) + H₂O(g)

• 2C₂H₂(g) + 5O₂(g) --> 4CO₂(g) + 2H₂O(g)

Multiple Choice

Interpret the balanced equation in terms of moles.

2C₂H₂(g) + 5O₂(g) --> 4CO₂(g) + 2H₂O(g)

• 1mol C₂H₂ + 2.5mol O₂ --> 2mol CO₂ + 1mol H₂O

• 2mol C₂H₂ + 5mol O₂ --> 4mol CO₂ + 2mol H₂O

• 52g C₂H₂ + 160g O₂ --> 176g CO₂ + 36g H₂O

• 1mol C₂H₂ + 1mol O₂ --> 1mol CO₂ + 1mol H₂O

Multiple Choice

Two molecules of hydrogen react with one molecule of oxygen to produce two moles of water. Select the balanced equation for this reaction.

• H₂ + O₂ --> H₂O

• 2H + O --> 2H₂O

• 2H₂ + O₂ --> 2H₂O

• H + O₂ --> H₂O