Chemical Reactions & Equations Transitional Reasoning Practice

Questions

1. 1.

   An environmental chemist investigates two chemical treatments designed to process industrial wastewater. In Treatment 1, solid zinc metal is added to an effluent containing dissolved tin(II) chloride, causing metallic tin to plate onto the zinc as zinc chloride dissolves into the solution. In Treatment 2, aqueous potassium sulfate is mixed into a separate stream containing dissolved barium nitrate, immediately producing an insoluble precipitate of barium sulfate alongside dissolved potassium nitrate. Based on these chemical transformations, which of the following correctly classifies Treatment 1 and Treatment 2, respectively?

   • A) Treatment 1: Double replacement; Treatment 2: Single replacement
   • B) Treatment 1: Synthesis; Treatment 2: Double replacement
   • C) Treatment 1: Single replacement; Treatment 2: Double replacement
   • D) Treatment 1: Single replacement; Treatment 2: Decomposition
2. 2.

   An aerospace technician monitors two independent chemical stages in an enclosed life-support and heating module. In Stage 1, solid sodium chlorate ($\text{NaClO}_3$) is heated to undergo breakdown into solid sodium chloride and oxygen gas. In Stage 2, methane gas ($\text{CH}_4$) combines rapidly with oxygen gas at elevated temperature, generating carbon dioxide, water vapor, and thermal energy. Based on these observed transformations, how are the reactions in Stage 1 and Stage 2 correctly classified?

   • A) Synthesis and double replacement
   • B) Single replacement and synthesis
   • C) Double replacement and decomposition
   • D) Decomposition and combustion
3. 3.

   In an analytical laboratory, a chemist conducts two separate trials to evaluate chemical transformations. In Experiment X, liquid ethanol is ignited in the presence of excess oxygen gas, releasing heat while forming carbon dioxide and water vapor. In Experiment Y, solid calcium metal is added to dilute hydrochloric acid, producing vigorous effervescence of hydrogen gas and leaving dissolved calcium chloride in the vessel. Based on these observations, how are the reactions in Experiment X and Experiment Y correctly classified?

   • A) Experiment X is a synthesis reaction, and Experiment Y is a double replacement reaction.
   • B) Experiment X is a decomposition reaction, and Experiment Y is a synthesis reaction.
   • C) Experiment X is a combustion reaction, and Experiment Y is a single replacement reaction.
   • D) Experiment X is a double replacement reaction, and Experiment Y is a decomposition reaction.
4. 4.

   During an industrial material-processing demonstration, an engineer monitors two closed reaction chambers. In Chamber 1, magnesium oxide powder reacts with carbon dioxide gas under controlled pressure to form solid magnesium carbonate as the sole resulting compound. In Chamber 2, mixing clear aqueous solutions of lead(II) nitrate and potassium iodide immediately produces a vibrant yellow solid precipitate along with a dissolved spectator salt. Based on these observations, how are Reaction 1 and Reaction 2 correctly classified?

   • A) Reaction 1 is a combustion reaction; Reaction 2 is a single replacement reaction.
   • B) Reaction 1 is a decomposition reaction; Reaction 2 is a synthesis reaction.
   • C) Reaction 1 is a double replacement reaction; Reaction 2 is a single replacement reaction.
   • D) Reaction 1 is a synthesis reaction; Reaction 2 is a double replacement reaction.
5. 5.

   In a laboratory investigation, a student heats a sample of solid copper(II) carbonate, which breaks down into black solid copper(II) oxide and carbon dioxide gas. Next, the student places a clean iron nail into a blue aqueous copper(II) sulfate solution, observing that metallic copper deposits onto the nail as iron(II) sulfate forms in the solution. Based on these experimental observations, which option correctly classifies the reaction in the first procedure and the reaction in the second procedure, respectively?

   • A) Synthesis and double replacement
   • B) Combustion and single replacement
   • C) Decomposition and single replacement
   • D) Decomposition and double replacement

Answers and step-by-step solutions appear after you finish the test.