中美课程

首页 /国际课程 /中美课程 /正文

AP化学实验课程

发布时间：2016-04-12 浏览次数：1348

AP化学实验课程是AP化学课程的一个重要组成部分，AP课程明确要求实验课成所占的比例和课时比例，不止在化学实验课程中，甚至在AP化学考试中也屡次出现实验题。像2006年5月的question #5 以及其他一些free response 和multiple-choice题目中都又涉及到。2007的question#2, #3, #5 or #6也都是基于化学实验基本知识和技能的。

根据AP化学考试大纲，我们开设AP课程的同时，也注重实验课程的开发和实施。

本学期我们做过一次化学实验，是关于氯化钠溶液的配制。下附实验教案。

Title: How to make a sodium chloride solution

I.          Teaching Aims:

1.       Knowledge objects:

1)      Understand basic terms: solute, solvent, solution;

2)      Learn how to calculate the mass of solute needed based on the volume and molarity of solution:

2.       Ability Objects:

1)        Learn the basic procedure of making solution;

2)        Learn how to use volumetric flask;

3)        Learn how to make a sodium chloride solution using volumetric flask.

II.       Teaching Key Points:

1)      Let students master the three basic terms: solute, solvent and solution;

2)      Let students master the laboratory skills involved in making chemical solutions.

III.     Teaching Approaches:

1)      Give tutorials before practical to let students know what they need to do;

2)      Give practical to let students make their own sodium chloride solutions by themselves in a two-person group.

IV.     Teaching Procedures:

Step 1 Calculate the weight of sodium chloride needed to make 100 mL of 0.1 M sodium chloride solution.

Formula

The formula for molarity (M) is: moles of solute / 1 liter of solution or gram-molecular masses of solute / 1 liter of solution.

Step 2 Weigh out amount of chemical needed using a balance.

Step 3 Dissolve the sodium chloride in a 50 mL beaker.

Step 4 Transfer the sodium chloride solution in the beaker to a clean, dry 100 ml volumetric flask.

Step 5 Slowly add distilled water to the volumetric flask. Keep adding water until you reach the 100ml mark on the neck of the flask.

Step 6 Put the cap on the volumetric flask and thoroughly mix the solution by inverting the flask several times.

You now have a sodium chloride solution whose molarity is very accurately known.

最新动态

Copyright@2015 南京市金陵中学河西分校国际部 苏ICP备05067371号-1