2 sentences

1. 这些基的化学性质各不相同。

   zhè​xiē jī de huà​xué xìng​zhì gè bù xiāng​tóng.

   The chemical properties of these functional groups are all different.

   Source: Dong Chinese Dictionary

2. 由于化学性质活泼，这种元素在自然界中很少以单质形式存在。

   yóu​yú huà​xué xìng​zhì huó​po, zhè zhǒng yuán​sù zài zì​rán​jiè zhōng hěn shǎo yǐ dān​zhì xíng​shì cún​zài.

   Due to its high chemical reactivity, this element is rarely found in nature in its pure form.

   Source: Dong Chinese Dictionary