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将下列各种物质（在标准大气压下） 吸热后首先发生的变化（温度或状态）填在题后的线上：

（1）0℃的水______；              （2）0℃的冰______；

（3）冰水混合物______；           （4）100℃的水______．

答案

（1）中0℃的水是液体，故其吸热后，首先是温度升高；（2）中0℃的冰是固态，且冰的熔点是0℃，故其在吸热后，就会开始熔化，且温度不升高；（3）中冰水混合物的温度是0℃，且冰的熔点是0℃，故其在吸热后，继续熔化且温度不升高；由于在标准大气压下水的沸点是100℃，故（4）中100℃的水吸热后就会开始沸腾．

故答案为：（1）温度升高；（2）开始熔化；（3）继续熔化；（4）开始沸腾．

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