发布网友 发布时间:2024-10-21 21:36
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热心网友 时间:2024-11-04 05:54
Essay on Water
Introction
Water is an essential ingredient for the existence of life as we know it. Biochemical processes occur in aqueous environments, many of which use water. Water also plays a significant role in the process of photosynthesis .Photosynthesis is the most basic and significant chemical reaction on earth, providing the primary nutrients, directly or indirectly, for all living organisms and is the primary source of atmospheric oxygen. Without water and its unique and unusual properties, life as we know it on earth would not exist. Water is the only substance naturally present on the earth that exists in three distinct states -solid, liquid, and gas. Many of the unique properties in the take for granted include the three physical phases, transparency, universal solvents, density behavior and temperature, high specific heat, high heat of vaporization, viscosity, surface tension and low compressibility. To understand why these properties exist in water and why they are essential to life on earth it is important to look at the shape and bonding patterns of the molecule because the uniqueness of water is a direct result of its shape and bonding patterns.
热心网友 时间:2024-11-04 05:54
水的研究学问可大,物理性质可发电,化学H2O可分解氢和养,是地球有生所必须。英语可以简单点,拿一杯水放点食盐,一会儿食盐不见了,哪去了。说明水是一种溶剂,可以溶解其它物质。热心网友 时间:2024-11-04 05:55
看看科学书,有图,就是不知道是哪一本那一页