化學反應快慢

化學反應快慢

第二節     化學反應的快慢學案

學習目標：

1、學會描述化學反應速率以及其表示方法，學會用化學反應速率進行簡單的計算。

2、認識影響化學反應速率的因素，并應用化學反應速率說明生產生活中的實際問題。

3、通過對影響速率的因素的探究，初步體會半定量實驗方案的設計

本節知識框架：

主動學習：

一、化學反應的快慢

學點一、化學反應速率：（閱讀教材p40，回答下列問題）

1、定義：                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

2、表達式：                                   

（用v表示化學反應速率，△c表示濃度的變化量，△t表示時間的變化量）

3、推斷單位：________________________________

[練習]：

1、在一個容器里，某氣體反應物a的濃度為1.6mol/l，5min后測得這種氣體反應物a的濃度為1.4mol/l，則用反應物a表示該反應的化學反應速率為