AP BIOLOGY

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BIOCHEMISTRY

PROPERTIES OF WATER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Reading Passage:Water molecules have unusual chemical and physical properties. Water can exist in all three states of matter at the same time:liquid, gas, and solid. Imagine that you’re sitting in your hot tub (filled with liquid water) watching the steam (gas) rise from the surface as you enjoy a cold drink from a glass filled with ice (solid) cubes. Very few other chemical substances can exist in all these physical states in this close of a temperature range. It is no wonder why water is essential for life. Its special properties make water the single most important molecule in plant life.Question:Which of the following properties of water enables water molecules to stick to one another?
A
Water expands as it freezes.
B
Water is an excellent solvent.
C
Water exhibits cohesive behavior.
D
Water is able to moderate temperature.
Explanation: 

Detailed explanation-1: -Because water seems so ubiquitous, many people are unaware of the unusual and unique properties of water, including: Boiling Point and Freezing Point. Surface Tension, Heat of Vaporization, and Vapor Pressure.

Detailed explanation-2: -Under normal conditions, water exists as a liquid. When water gets freezes to 0 °C, it will turn into ice, a solid form of water. Whereas when water gets heated to 100 °C, it will turn into water vapour, gaseous state.

Detailed explanation-3: -Unique properties of water Water molecules are polar, with partial positive charges on the hydrogens, a partial negative charge on the oxygen, and a bent overall structure. This is because oxygen is more electronegative, meaning that it is better than hydrogen at attracting electrons. Water is an excellent solvent.

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