一、物理与化学学科知识的综合这类题目根据化学反应、化学计算与压力、压强、浮力、杠杆平衡条件等知识渗透.例1在一台较灵敏的托盘秤上放有一只密封的吸滤瓶,瓶嘴紧扎小气球,如图1所示,设法使试管中的盐酸与小苏打(NaHCO_3)发生化学反应,使瓶内气体不断增加,当气球的体积大到一定程度时,化学反应完毕,发现托盘秤的示 First, the synthesis of knowledge of the discipline of physics and chemistry These topics are based on knowledge of chemical reactions, chemical calculations and pressure, pressure, buoyancy, and leverage balance conditions. Example 1 A sealed suction filter is placed on a relatively sensitive pallet scale. The bottle and the bottle mouth tightly squeezing a small balloon, as shown in Figure 1, managed to make the hydrochloric acid in the test tube chemically react with baking soda (NaHCO 3 ) to increase the gas in the bottle. When the volume of the balloon is large enough, the chemical reaction is complete. , found the display of the tray scale