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职场办公室 on MSN
16 天
新高考背景下实验教学如何落实学科核心素养培育
引导学生捕捉“意外”,发展批判性思维、提高科学探究与创新意识在“补铁剂中铁元素价态的检验”实验教学中,为检验是否有Fe2+,学生进行了以下实验:补铁口服液中加入少量NaOH溶液,观察现象;补铁口服液中加入少量酸性KMnO4溶液,观察现象;补铁口服液中 ...
高考网
25 天
2025年高考对高中化学学习的要求
涉及下列反应: (2)用Na2S2O3标准溶液滴定I2时(反应④)选用的指示剂是_____。 (3)取b0mL待测液,用硫酸使溶液酸化,再用浓度为a1mol·的KmnO4标准溶液滴定其中的H2O2,耗用的KMnO4体积为b1mL(反应①,滴定过程中KmnO4不与过氧乙酸反应)。 另取b0mL待测液 ...
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