【題目】水中溶解碳酸鈉粉末，溶液溫度升高，下列解釋正確的是（ ）

A.溶解過程只放熱不吸熱

B.溶解過程只吸熱不放熱

C.溶解過程不吸熱不放熱

D.溶解過程既吸收熱量也放出熱量，只是放出的熱量大于吸收的熱量

【答案】D

【解析】

試題分析：任何物質(zhì)的溶解都包含著吸熱和放熱兩個過程，如果放出的熱量大于吸收的熱量，溶液溫度升高；如果放出的熱量小于吸收的熱量，溶液溫度降低；如果放出熱量等于吸收的熱量，溶液溫度不變。碳酸鈉溶于水，溶液溫度升高，說明溶解過程中放出的熱量大于吸收的熱量，故D正確。

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