Chemical Reactions Quiz

What is the purpose of balancing a chemical equation?

• To determine the products of the reaction

• To ensure the equation follows the law of conservation of mass

• To calculate the energy change of the reaction

• To determine the rate of the reaction

Which of the following is a balanced chemical equation?

• 2 H2 + O2 -> 2 H2O

• H2 + O2 -> H2O

• H2 + O2 -> 2 H2O

• 2 H2 + O2 -> H2O

What is the driving force behind a precipitation reaction?

• Formation of a gas

• Formation of a weak electrolyte

• Formation of an insoluble solid

• Formation of water

Which of the following is a strong electrolyte?

• Sucrose

• NaCl

• HC2H3O2

• NH3

What is the oxidation number of sulfur in H2S?

• -2

• +2

• -1

• +1

What is the product of the decomposition reaction 2H2O -> 2H2 + O2?

• 2H2O

• 2H2

• O2

• H2O

What type of reaction is BaCl2 + K2SO4 -> BaSO4 + 2KCl?

• Combustion

• Combination

• Decomposition

• Exchange

What is the driving force behind a precipitation reaction?

• Formation of a gas

• Formation of a weak electrolyte

• Formation of an insoluble solid

• Formation of water

What is the net ionic equation for the reaction between HClO4 and KOH?

• HClO4 + KOH -> KClO4 + H2O

• H+ + OH- -> H2O

• HClO4 + OH- -> ClO4- + H2O

• H+ + KOH -> H2O + K+

Which of the following is a characteristic of combustion reactions?

• React with oxygen

• Produce light and heat

• Yield CO2 and H2O

• All of the above