题目

糕点疏松剂的主要成分中含有碳酸氢钠，某化学兴趣小组对碳酸氢钠的化学性质进行探究。 【探究实验一】碳酸氢钠溶液的酸碱性：用pH试纸测得碳酸氢钠溶液的pH约为10，由此得出结论是碳酸氢钠溶液呈____________。 【探究实验二】碳酸氢钠能否与酸反应：取少量固体放入试管中，滴加足量的稀盐酸，现象为______________。结论：碳酸氢钠能与酸反应。 【探究实验三】碳酸氢钠的热稳定性：取一定量的碳酸氢钠放在铜片上加热，如右图所示： (1)加热一1根据短文内容和首字母提示，把所缺单词填写在短文后面相应的横线上，使句意完整。 It's very important for us to keep h__1.____in our everyday life. Here is some a___2.__for you. First, you should have healthy diet. Different food helps us in different w___3.___. You should eat more fruit and vegetables instead o___4.__hamburgers, Beijing roast duck and so on. If you choose the right food, you can have healthy eating habits. Second, doing exercise is good f_5.___your health. For example, climbing mountains, riding bikes or swimming. Third, you should s___6.__at least eight hours a day and you shouldn't work or study too hard. Finally, remember that s _7.___is bad for your health, so don't smoke, you will become m__8._healthier.