Fill in the blanks

1、填空题：
An atom is the smallest__1__ of a chemical element.‌‎‌
答案: 【 particle】

2、填空题：
Atoms are composed of subatomic particles, including protons,__2__ , and electrons.‏​‏
答案: 【 neutrons】

3、填空题：
One of the most well-known __3___forms in the world is water.‎​‎
答案: 【 molecular】

4、填空题：
Dalton recognized that the structure of atoms in a particular element or compound is__4_.‍​‍
答案: 【 uniform】

5、填空题：
Amedeo Avogadro (1776-1856), an Italian physicist, was the first scientist to__5_ the distinction between atoms and molecules.‏‍‏
答案: 【 clarify】

Quiz for Lecture 2

1、填空题：
Read the list of common organic chemicals below and try to put them in the right categories. Write its number in the right place. ‍shampoo‍gasoline‍perfume‍drug‍paint‍plastic‍paper‍fertilizer‍wood‍coal‍cleaning solvent‍vitamin‍soap‍natural gas‍moth ball‍insect repellent‍nail polish remover‍‍Category 1  insectifuge _____________________. ‍‎‍‎‍
答案: 【 15##%_YZPRLFH_%##16】

2、填空题：
‏Category 2 fuel _____________________‌
答案: 【 2##%_YZPRLFH_%##10##%_YZPRLFH_%##14】

3、填空题：
‏Category 3 home maintenance _____________________ ‎
答案: 【 6##%_YZPRLFH_%##9##%_YZPRLFH_%##11】

4、填空题：
‍Category 4 health product ___________________‌
答案: 【 4##%_YZPRLFH_%##12】

5、填空题：
‍Category 5 personal care ______________________ ​
答案: 【 1##%_YZPRLFH_%##2##%_YZPRLFH_%##13##%_YZPRLFH_%##17】

6、填空题：
‌Category 6 others ______________________‍
答案: 【 7##%_YZPRLFH_%##8】

Quiz for Lecture 3

1、填空题：
‍Read Text A and complete the table with the brief information in Text A.​‍​Time​Chemist(s)​Major achievement(s)​1823​Michel   Chevreul​‍  ​‍                                 (                                                                                                                      )​
答案: 【 showed the process of saponification】

2、填空题：
Time‍Chemist(s)‍Major achievement(s)‍‌ ‍Friedrich Wöhler‍‌ ‍‌‍                                   (                                                                                                                      )
答案: 【 1828; produced the organic chemical urea (carbamide), a constituent of urine, from the inorganic ammonium cyanate NH4CNO】

3、填空题：
Time‏Chemist(s)‏Major achievement(s)‏1856‏ ‏ ‏‌‏‌                             (                                                                                                                      )‏
答案: 【 William Henry Perkin: manufactured the