根据下列实验及规象,能量关系正确的是()
A. 钠投入水中,熔化成小球:生成物的总能量高于反应物总能量
B. NaOH 溶液与 $\m...
Mar 19, 2024
根据下列实验及规象,能量关系正确的是()
A. 钠投入水中,熔化成小球:生成物的总能量高于反应物总能量
B. NaOH 溶液与 HCl 溶液混合,溶液温度升高:反应放热
C. 将“ NO2 球”置于热水中,红棕色加深: \mathrm{N}_{2} \mathrm{O}_{4}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}_{2}(\mathrm{~g}) ; \Delta H<0
D. 微热含 2 滴酚唒的 Na2CO3 溶液,红色加深: \mathrm{CO}_{3}^{2-}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{HCO}_{3}^{-}+\mathrm{OH}^{-} ; \Delta H<0
B
Key Concept
Exothermic Reaction
Explanation
When an NaOH solution is mixed with an HCl solution, the reaction is exothermic, meaning it releases heat, which causes the temperature of the solution to rise.