Natural Science Exam 2 Questions with Latest Update
Water - ANSWER-most abundant substance on the SURFace of the planet oceans cover 70% of the planets surface Why is water important? - ANSWER--Maintains climate -Dilutes pollutants -Essential to ALL life - Most living things are composed by water (weight) Trees-60% Most animals/humans 65-70% Surface Tension - ANSWER--observed by the "skin" that forms on the surface of water due to molecular bond (STICKINESS) - water striders and spiders can travel on this Capillarity - ANSWER-the ability of water to move upward against GRAVITY in small pores or tubes ex: transpiration Solvent - ANSWER--Water DISSOLVES more compounds than any other liquid - nutrients can be carried through tissues -waste can be removed from systems - water is easily polluted by water soluble wastes ex: acids, salts, toxic metals Coolant - ANSWER--a lot of energy required to change from one physical state to another - allows water to store HEAT (heat capacity) - when it does change, it removes heat and is cooled by EVAPORATION ex: car engines/ thermoelectric power plants like coal and gas Water expands upon freezing -Water is less dense when frozen which is why ice floats -Why is it important to aquatic life? - ANSWER- What recreation does water provide humans? End of Chapter 4 - ANSWER-swimming, boating, fishing etc...
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- 16 de abril de 2024
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