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“3+X”跨学科综合试题,是命题者以中学各学科知识为基础,将相关学科的知识点有机地渗透、交叉、融合,构成一定情境的知识网络题,它更能体现出相关学科知识的相互联系、相互作用、相互促进的科学发展总趋势,为培养学生应用知识的意识、实践能力与创新精神奠定了基础。本文就物理知识在解决化学问题中的应用举例如下,供参考。 1.运用密度概念,分析某些现象例1 在一烧杯中盛有100mL2mol·L-1的硫酸溶液,同时有一表面光滑的塑料小球悬浮于溶液中央,如图1所示。向该烧杯中缓慢注入0.4mol·L-1的氢氧化钡溶液至恰好完全反应,在此实验过程中,烧杯里能观察到的实验现象是:(1)_(2)_。
The “3+X” interdisciplinary comprehensive test questions are based on the subject knowledge of the middle school, and organically infiltrate, cross and integrate the knowledge of relevant disciplines, and constitute a knowledge network problem in a certain situation. It can better reflect the relevant disciplines. The general trend of scientific development in the mutual connection, interaction, and mutual promotion of knowledge has laid the foundation for cultivating students’ awareness of applied knowledge, practical ability, and innovative spirit. This article gives examples of the application of physical knowledge in solving chemical problems as follows. 1. Using the concept of density to analyze certain phenomena Example 1 In a beaker there is 100 mL of 2 mol·L-1 sulfuric acid solution, with a smooth plastic pellet suspended in the middle of the solution, as shown in Figure 1. Slowly inject 0.4 mol·L-1 yttrium hydroxide solution into the beaker until it completely reacts. During this experiment, the observed experimental phenomena in the beaker are: (1)_(2)_.