| 1 | 乙烯 | 乙烯 | yǐ xī | yi3 xi1 | ethylene; vinyl | | |
| 2 | 苧烯 | 薴烯 | níng xī | ning2 xi1 | (chemistry) limonene | | |
| 3 | 聚苯乙烯 | 聚苯乙烯 | jù běn yǐ xī | ju4 ben3 yi3 xi1 | polystyrene | | |
| 4 | 萜烯 | 萜烯 | tiē xī | tie1 xi1 | terpene (chemistry) | | |
| 5 | 四氯乙烯 | 四氯乙烯 | sì lǜ yǐ xī | si4 lu:4 yi3 xi1 | tetrachloroethylene | | |
| 6 | 石墨烯 | 石墨烯 | shí mò xī | shi2 mo4 xi1 | graphene | | |
| 7 | 玉米赤霉烯酮 | 玉米赤霉烯酮 | yù mǐ chì méi xī tóng | yu4 mi3 chi4 mei2 xi1 tong2 | zearalenone | | |
| 8 | 氯乙烯 | 氯乙烯 | lǜ yǐ xī | lu:4 yi3 xi1 | chloroethylene; vinyl chloride C2H3Cl; chloroethylene | | |
| 9 | 莰烯 | 莰烯 | kǎn xī | kan3 xi1 | camphene C10H16 | | |
| 10 | 聚乙烯 | 聚乙烯 | jù yǐ xī | ju4 yi3 xi1 | polythene; polyethylene | | |
| 11 | 聚四氟乙烯 | 聚四氟乙烯 | jù sì fú yǐ xī | ju4 si4 fu2 yi3 xi1 | polytetrafluoroethylene (PTFE), trademarked as Teflon | | |
| 12 | 聚氯乙烯 | 聚氯乙烯 | jù lǜ yǐ xī | ju4 lu:4 yi3 xi1 | polyvinyl chloride (PVC) | | |
| 13 | 聚丙烯 | 聚丙烯 | jù bǐng xī | ju4 bing3 xi1 | polypropylene | | |
| 14 | 白三烯 | 白三烯 | bái sān xī | bai2 san1 xi1 | leukotriene (biochemistry) | | |
| 15 | 环戊烯 | 環戊烯 | huán wù xī | huan2 wu4 xi1 | cyclopentene C5H8 (ring of five carbon atoms) | | |
| 16 | 丁烯 | 丁烯 | dīng xī | ding1 xi1 | butene or butylene C4H8 | | |
| 17 | 丁二烯 | 丁二烯 | dīng èr xī | ding1 er4 xi1 | butadiene C4H6; biethylene | | |
| 18 | 氮烯 | 氮烯 | dàn xī | dan4 xi1 | nitrene (chemistry) | | |
| 19 | 单端孢霉烯类毒素中毒症 | 單端孢霉烯類毒素中毒症 | dān duān bāo méi xī lèi dú sù zhōng dú zhèng | dan1 duan1 bao1 mei2 xi1 lei4 du2 su4 zhong1 du2 zheng4 | trichothecenes toxicosis | | |
| 20 | 单端孢霉烯类毒素 | 單端孢霉烯類毒素 | dān duān bāo méi xī lèi dú sù | dan1 duan1 bao1 mei2 xi1 lei4 du2 su4 | trichothecenes (TS, T-2) | | |
| 21 | 丙烯酸酯 | 丙烯酸酯 | bǐng xī suān zhǐ | bing3 xi1 suan1 zhi3 | acrylic ester | | |
| 22 | 丙烯酸 | 丙烯酸 | bǐng xī suān | bing3 xi1 suan1 | acrylic acid C3H4O2 | | |
| 23 | 丙烯醛 | 丙烯醛 | bǐng xī quán | bing3 xi1 quan2 | acrolein CH2CHCHO | | |
| 24 | 丙烯腈 | 丙烯腈 | bǐng xī jīng | bing3 xi1 jing1 | acrylo-nitrile | | |
| 25 | 丙烯 | 丙烯 | bǐng xī | bing3 xi1 | propylene C3H6 | | |