【題目】在盛有一定量水的試管中緩慢加入濃硫酸,用玻璃棒不斷攪拌,溶解后,用手觸摸試管外壁時(shí)感覺(jué)到試管發(fā)燙,主要原因是_________________________________.

【答案】濃硫酸溶于水放熱,使溶液的溫度升高

【解析】

試題分析:物質(zhì)的溶解過(guò)程中伴隨著熱量的變化,有的物質(zhì)溶解時(shí)放熱,有的物質(zhì)溶解時(shí)吸熱,有的物質(zhì)溶解時(shí)溶液溫度幾乎不變。濃硫酸、氫氧化鈉等物質(zhì)溶解時(shí)都是放熱的,所以溶液溫度升高.

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