Chemical Reactions & Equations Original Scenario-Based Download PDF

Questions

1. 1.

   To reinforce the outer hull of an oceanographic exploration vessel operating near superheated abyssal vents, an automated maintenance drone synthesizes a resilient mineral barrier by fusing elemental iron filings with molten sulfur according to the equation $\text{Fe}(s) + \text{S}(s) \rightarrow \text{FeS}(s)$. Based on the nature of the reactants and the formation of a single compound, which primary type of chemical reaction does this fabrication process represent?

   • A) Decomposition reaction
   • B) Synthesis reaction
   • C) Single replacement reaction
   • D) Double replacement reaction
2. 2.

   To melt through subterranean glacial barriers on a subzero exoplanet, an automated thermal probe ignites a pressurized stream of liquid ethanol with pure oxygen inside an insulated chamber. The exothermic process releases immense heat along with gaseous carbon dioxide and water vapor according to the equation $\text{C}_2\text{H}_5\text{OH}(l) + 3\text{O}_2(g) \rightarrow 2\text{CO}_2(g) + 3\text{H}_2\text{O}(g)$. Based on the reactants consumed and products generated, which primary class of chemical reaction powers this thermal drilling system?

   • A) Decomposition
   • B) Single replacement
   • C) Synthesis
   • D) Combustion
3. 3.

   During an emergency deep-space depressurization event, an autonomous rescue pod activates its solid-state chemical oxygen generator to replenish the life-support atmosphere. Inside the sealed canister, solid sodium chlorate breaks down under rapid thermal ignition to form solid sodium chloride and gaseous oxygen according to the equation $2\text{NaClO}_3(s) \rightarrow 2\text{NaCl}(s) + 3\text{O}_2(g)$. Based on this chemical transformation, which primary type of reaction describes this life-saving process?

   • A) Synthesis reaction
   • B) Decomposition reaction
   • C) Single replacement reaction
   • D) Combustion reaction
4. 4.

   An autonomous mining rover exploring an acidic extraterrestrial lake bed precipitates dissolved silver from silver nitrate runoff by lowering sacrificial copper coils into the basin. The process forms aqueous copper(II) nitrate while plating bright crystals of metallic silver onto the coils according to the equation $\text{Cu}(s) + 2\text{AgNO}_3(aq) \rightarrow \text{Cu(NO}_3)_2(aq) + 2\text{Ag}(s)$. Which type of chemical reaction does this automated metal recovery process represent?

   • A) Single replacement
   • B) Double replacement
   • C) Synthesis
   • D) Decomposition
5. 5.

   To prevent critical equipment corrosion in an off-world orbital greenhouse, automated environmental scrubbers neutralize toxic hydrogen sulfide gas by bubbling it through aqueous copper(II) sulfate. The reaction produces a dense black precipitate of copper(II) sulfide and leaves sulfuric acid dissolved in the recycling bath according to the equation $\text{H}_2\text{S}(g) + \text{CuSO}_4(aq) \rightarrow \text{CuS}(s) + \text{H}_2\text{SO}_4(aq)$. Which type of chemical reaction does this life-support purification process represent?

   • A) Synthesis reaction
   • B) Decomposition reaction
   • C) Single replacement reaction
   • D) Double replacement reaction