论文部分内容阅读
图表型计算题作为中考化学中难度大、综合性强的压轴题,是近年来各省市使用频率很高且具有新意、需不断完善改进的题型。它能考查学生通过图表中的数据和信息从多方位比较分析、判断数据的有效性、真实性的能力。可以说对能力的要求更高、更能展现出学生的思维轨迹。例1.在烧杯中加入 NaCl 和 NaHCO_3的固体混合物10.0g,再加入68.9g 稀盐酸后恰好完全反应。反应过程中用精密仪器测得烧杯连同药品的总质量(m)与反应时间(t)的关系如图1所示。烧杯连同药品起始总质量为165.0g。反应的化学方程式为:
Chart calculation problems as a senior high school entrance examination in the difficult chemistry, comprehensive strong finale, is the high frequency of use in various provinces and cities in recent years and has something new, need to constantly improve the type of question. It examines the ability of students to compare data from multiple sources in a chart to determine the validity and authenticity of the data. It can be said that the ability to require higher, more to show the students’ thinking track. Example 1. 10.0 g of a solid mixture of NaCl and NaHCO 3 was added to a beaker, and exactly 68.4 g of dilute hydrochloric acid was added thereto. The reaction process with a precision instrument measured beaker with the total mass of the drug (m) and the reaction time (t) of the relationship shown in Figure 1. The initial mass of beaker together with the drug was 165.0g. The chemical equation of the reaction is: