Proper formatting of alkaline earth metal-water reactions

Steps:

• Identify reactants: water reacts separately with calcium or strontium, both group 2 metals.
• Recall equations: Ca + 2H₂O → Ca(OH)₂ + H₂; Sr + 2H₂O → Sr(OH)₂ + H₂.
• Analyze format: choices use | to separate reagent, metal, and product description.
• Select option with water first (reagent), metals second (variable), and strontium-specific product third for separate reactions.

Why D is correct:

• It lists water as initial reagent, calcium or strontium as reacting metals, and "strontium + water" as strontium's specific reaction, matching the formula Sr + 2H₂O → products.

Why the others are wrong:

• A: Starts with metals as primary, uses "calcium + water" product, ignoring strontium's distinct reaction.
• B: Starts with metals, uses "strontium + water" product, failing to prioritize water as reagent.
• C: Uses "calcium + water" product for both metals, not distinguishing strontium's separate reaction.

Final answer: D