当前位置:首页>学习笔记>【26版物理步步高人教版学习笔记选择性必修第三册第二章4固体

【26版物理步步高人教版学习笔记选择性必修第三册第二章4固体

  • 2026-03-09 16:32:25
【26版物理步步高人教版学习笔记选择性必修第三册第二章4固体

[学习目标]1.知道晶体和非晶体的特点及其区分方法,明确单晶体和多晶体的区别(重点)。2.了解晶体的微观结构,知道晶体和非晶体形状和物理性质不同的原因(难点)。

一、晶体和非晶体

1.观察以下两组图片,说出它们外形上的区别?再用显微镜观察食盐和松香粉末的外形,两者有什么样的差别吗?

2.在玻璃片和云母片上分别涂上一层很薄的石蜡,然后用烧热的钢针去接触玻璃片及云母片未涂蜡的一面,石蜡熔化,如图所示,那么你看到的现象及得出的结论是什么?

________________________________________________________________________________________________________________________________________________________________________________________

1.固体的分类及性质

固体

天然外形

物理性质

(导热性能、

机械强度、

导电性能)

有无确

定熔点

晶体

规则的几何外形,如金刚石、云母、明矾、雪花、食盐、味精等

各向同性或

各向异性

确定

熔点

非晶体

不具有规则的几何外形,如玻璃、松香、沥青、橡胶等

各向

确定的

熔化温度

2.晶体的分类及性质

晶体

构成

物理性质

有无确定熔点

单晶体

大块晶体

各向

有确定熔点

多晶体

构成

各向

有确定熔点

1.常见的金属没有规则的形状,但具有确定的熔点。它们是晶体还是非晶体?

________________________________________________________________________________________________________________________________________________________________________________________2.某人为了检验一块薄片物质是否为晶体,做了一个实验。他以薄片的正中央O为坐标原点,建立xOy平面直角坐标系,在两个坐标轴上分别取两点x1y1,使x1y1O点的距离相等。在x1y1上分别固定一个测温元件,再把一个针状热源放在O点,发现x1点和y1点的温度在缓慢升高,但两点温度的高低没有差异。于是得出结论:这块薄片是非晶体。请说明:以上结论科学吗?为什么?

________________________________________________________________________________________________________________________________________________________________________________________

(1)所有晶体都具有天然、规则的几何外形。()

(2)没有确定的熔化温度的固体一定是非晶体。()

(3)物理性质表现为各向同性的一定是非晶体。()

(4)单晶体的各向异性是指在每一种物理性质上都表现为各向异性。()

(5)某一大块多晶体粉碎成形状相同的颗粒,每个颗粒为一个单晶体。(  )

1 下列关于固体的说法中正确的是(  )

A.晶体熔化时,温度不变,但内能变化

B.单晶体一定是单质,有确定的几何形状,有确定的熔点

C.多晶体没有确定的几何形状,也没有确定的熔点

D.晶体都是各向异性的,而非晶体都是各向同性的

2(2023·唐山市开滦第二中学高二月考)在图甲、乙、丙三种固体薄片上涂上蜡,用烧热的针接触其上一点,蜡熔化的范围如图甲、乙、丙所示,而甲、乙、丙三种固体在熔化过程中温度随加热时间变化的关系如图(b)所示,以下说法正确的是(  )

A.甲为单晶体

B.乙为非晶体

C.丙为多晶体

D.甲、丙为非晶体,乙为晶体

关于晶体和非晶体的两点提醒

1.晶体具有各向异性,并不是只有导热性能上的各向异性,也不是每种晶体在各种物理性质上都会表现出各向异性。例如,云母片在导热性能上表现出各向异性,方铅矿在导电性能上表现出各向异性,方解石在光的折射上表现出各向异性,铜晶体在弹性上表现出各向异性等等。

2.晶体与非晶体在一定的条件下可以相互转化。如非晶态的玻璃经过加热冷却反复处理,可使其结构有序化,变为多晶体;传统的金属晶体经过急冷处理,可制得非晶态金属——金属玻璃。

二、晶体的微观结构

单晶体具有规则的几何外形,物理性质方面表现为各向异性,而非晶体没有规则的几何外形,并且物理性质方面表现为各向同性。产生这些不同的根本原因是什么呢?

通过网盘分享的文件:【学生用书Word版文档】整书等6个文件

链接: https://pan.baidu.com/s/1WrqhWD388uzcm3Z1gXKHEA?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.000433s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000583s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000233s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000291s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000492s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000600s ]
  8. SELECT * FROM `article` WHERE `id` = 473115 LIMIT 1 [ RunTime:0.000397s ]
  9. UPDATE `article` SET `lasttime` = 1773106094 WHERE `id` = 473115 [ RunTime:0.011615s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000299s ]
  11. SELECT * FROM `article` WHERE `id` < 473115 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000542s ]
  12. SELECT * FROM `article` WHERE `id` > 473115 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000487s ]
  13. SELECT * FROM `article` WHERE `id` < 473115 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000691s ]
  14. SELECT * FROM `article` WHERE `id` < 473115 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003258s ]
  15. SELECT * FROM `article` WHERE `id` < 473115 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003734s ]
0.136731s