BIO 1305 Lecture Notes - Lecture 3: Molecular Mass, Molar Concentration, Unified Atomic Mass Unit

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16 Sep 2017
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Water is the only common substance to exist in the natural environment in all three physical states of matter. Wate(cid:396)"s u(cid:374)i(cid:395)ue emergent properties help make earth suitable for life. The structure of the water molecule allows it to interact with other molecules. Concept 3. 1: polar covalent bonds in water molecules result in hydrogen bonding. In the water molecule, the electrons of the polar covalent bonds spend more time near the oxygen than the hydrogen. The water molecule is thus a polar molecule: Polarity allows water molecules to form hydrogen bonds with each other. Concept 3. 2: four emergent properties of (cid:449)ate(cid:396) (cid:272)o(cid:374)t(cid:396)i(cid:271)ute to ea(cid:396)th"s suita(cid:271)ility fo(cid:396) life. Fou(cid:396) of (cid:449)ate(cid:396)"s p(cid:396)ope(cid:396)ties that fa(cid:272)ilitate a(cid:374) e(cid:374)(cid:448)i(cid:396)o(cid:374)(cid:373)e(cid:374)t fo(cid:396) life a(cid:396)e. Collectively, hydrogen bonds hold water molecules together, a phenomenon called cohesion. Cohesion helps the transport of water against gravity in plants. Adhesion is an attraction between different substances, for example, between water and plant cell walls.

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