CH-1257
Exothermic and endothermic reactions
Chemistry · Secondary 4 · Hard · Exothermic and endothermic reactions
A student measures the temperature change when 50.0 cm³ of 1.0 mol/dm³ hydrochloric acid reacts with excess solid magnesium. The temperature rises from 25.0 °C to 32.0 °C.
Which statement best explains this observation?
Which statement best explains this observation?
- The reaction is exothermic because it releases heat to the solution.
- The reaction is endothermic because it absorbs heat from the solution.
- The reaction is exothermic because it absorbs heat from the surroundings.
- The reaction is endothermic because it releases heat to the surroundings.
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