高一上
oss to let him go home earlier that day. The young man asked his boss, “ Let_ me go home earlier today.” Ⅲ .单句改错 his laziness he often fails in his exams. Because → Because of if they don’t know each
make a journey 15. make up one’s mind 下决心,决定 , keep in mind, 记住 Eg: I can’t make up my mind whether to go or not. We have made up our mind to finish the work before dark. make up one’s mind
He climbed up to the top of the hill with difficulty. 7. I am not very good at municating with people. municate with sb. municate sth to sb munication:n . Parents should often __________ with their
be afraid of sb/sth 担心(害怕)„ be afraid to do sth 不敢做某事 be afraid that 担心 I’m afraid„ 恐怕„(用于推测某种令人不愉快的事情) I’m afraid so. 恐怕是这样 I’m afraid not. 恐怕是这样 through 仔细检查,审查 Our teacher goes through our
g the Tangshan quake.(Turn to page 27, ex2) T: here are some more work for you. You can work in groups. T: Let’s watch some pictures, and paring the old Tangshan, the Tangshan after quake, and the
help of the notes, students should be able to retell the interview with their own words. The purpose of this step is to give the students some language input, develop their notetaking skill, and give
me in China: Nanhaizi Milu Park in Beijing ③ South China tiger: Problem: too much hunting in the 1950s Improvement: About 30 – 60 after being left in peace with no hunting Home in China: B aishanzu
子或离子要克服分子或离子之 间的引力,需要向外界吸收热量,这是一个物理过程(物理变化)。 另一个过程则是溶质分子或离子和水分子又结合成水合分子或水合离子的过程,这种过程放出热量是一个化学过程。 小结: 扩散的过程 水合过程 溶解中的变化 物理变化(物理过程) 化学变化(化学过程) 溶解中的能量变化 吸热 放热 在溶解时: ①当扩散过程吸收热量>水合过程 放出的热量时,则总体表现为吸热。
解平衡 结晶和溶解是相反的过程,但在一定条件下,这两个过程是同时进行的。 可逆过程: 在一定条件下,既可正向也可逆向进行的过程。 吸收能量 吸收能量 放出能量 放出能量 固态 液态 气态 溶解速率 结晶速率;溶质 不断溶解 ,溶液是 不饱和溶液 溶解速率 结晶速率;溶质 不断结晶析出 ,溶液是 过饱和溶液 溶解速率 = 结晶速率;溶质 量保持不变,不再减少 /增加 ,溶液是 饱和溶
5)研究对象:一定压强下,在敞口容器中发生的反应所放出或吸收的热量 (6)反应热产生的原因 (7).反应热表示方法 ①当生成物释放的总能量大于反应物吸收的总能量时,反应为放热反应, AH为 “ ”或 0 ②当生成物释放的总能量小于反应物吸收的总能量时,反应是吸热反应, AH为“ +”或 0 第二课时 [复习提问 ]什么是化学反应热 ?如何表示 ?如何准确地描述物质间的化学反应及其能量变化