Endothermic Reactions Absorb Energy

Steps:

• Recall endothermic reactions absorb heat from surroundings, increasing system energy (ΔH > 0).
• Identify correct statements: typically, 1 (absorbs heat) and 3 (surroundings cool) align with definition.
• Eliminate pairs with incorrect statements: 2 often confuses with exothermic (releases heat), 4 may misstate bond breaking/forming.
• Confirm A matches valid endothermic traits per thermodynamics.

Why A is correct:

• Statements 1 and 3 match endothermic definition: heat absorption (ΔH positive) cools surroundings.

Why the others are wrong:

• B includes 4, which likely reverses energy flow, violating ΔH > 0.
• C includes 2, typically exothermic trait (heat release).
• D pairs two exothermic-like errors.

Not enough information on exact statements 1–4 for full verification.

Final answer: A