大学MOOC 材料科学基础（上）(西北工业大学)1449912170 最新慕课完整章节测试答案

第一章原子结构及键合测验

1、单选题：
‎Ionic bonding is formed by (  )‌
选项：
A: valence electron transfer‍
B: shared electron pair
C: free electron and cation
D: attraction of the electric dipoles
答案: 【 valence electron transfer‍】

2、单选题：
​Covalent bonding is formed by ( )​
选项：
A: shared electron pair
B: valence electron transfer
C: free electron and cation
D: attraction of the electric dipoles
答案: 【 shared electron pair】

3、单选题：
‏Metallic bonding is formed by (  )‍
选项：
A: free electron and cation
B: valence electron transfer 
C: shared electron pair
D: attraction of the electric dipoles
答案: 【 free electron and cation】

4、多选题：
​Crystals which are mainly formed by metallic bonding‎
选项：
A: hardness is either high or low 
B: solid conductive 
C: liquid conductive
D: high melting point
E: poor plasticity 
答案: 【 hardness is either high or low ;
solid conductive ;
liquid conductive】

5、多选题：
‏Crystals which are mainly formed by ionic bonding:​
选项：
A: high melting point
B: poor plasticity 
C: low hardness 
D: solid conductive 
E: liquid non-conductive 
答案: 【 high melting point;
poor plasticity 】

6、判断题：
‎Molecular bonds are directional.‏
选项：
A: 正确
B: 错误
答案: 【 错误】

7、判断题：
‍Hydrogen bonding is directional.‎
选项：
A: 正确
B: 错误
答案: 【 正确】

8、判断题：
‍Generally speaking, the bonding energy of ionic bonding is stronger than that of covalent bonding.  ‏
选项：
A: 正确
B: 错误
答案: 【 正确】

9、判断题：
‏Covalent bonding is directional. ‎
选项：
A: 正确
B: 错误
答案: 【 正确】

10、判断题：
‍The bonding energy of metallic bonding varies greatly. ‎
选项：
A: 正确
B: 错误
答案: 【 正确】

11、判断题：
‌Metallic bonding is directional.​
选项：
A: 正确
B: 错误
答案: 【 错误】

第二章晶体的结构一测验

1、多选题：
‎Cubic crystal system includes：​‎​
选项：
A: simple cubic
B: face-centered cubic
C: body-centered cubic
D: base-centered cubic
答案: 【 simple cubic;
face-centered cubic;
body-centered cubic】

2、多选题：
​Orthorhombic crystal system includes:‌
选项：
A: simple orthorhombic
B: base-centered orthorhombic
C: face-centered orthorhombic
D: body-centered orthorhombic
答案: 【 simple orthorhombic;
base-centered orthorhombic;