AP BIOLOGY

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BIOCHEMISTRY

PROPERTIES OF WATER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Reading Passage:One of the things that makes our planet special is the presence of liquid water. Water is fundamental for all life; without it every living thing would die. It covers about 70% of Earth’s surface and it makes up 65-75% of our bodies (82% of our blood is water). Even though water seems boring-no color, taste, or smell-it has amazing properties that make it necessary for supporting life.The chemical composition of water is H2O-two hydrogen atoms and one oxygen atom. Water has special properties because of the way these atoms bond together to form a water molecule, and the way the molecules interact with each other. The special arrangenment leads to water being a polar molecule. Question:Water is defined as a polar molecule because ____
A
it contains two hydrogen atoms for each oxygen atom.
B
it has a charge.
C
different parts of the molecule have slightly different charges.
D
it does not have a charge.
Explanation: 

Detailed explanation-1: -Around 60 percent of our body is made up of water and we can only live three to five days without fluids. Water plays many important roles in the body including flushing waste from the body, regulating body temperature, transportation of nutrients and is necessary for digestion.

Detailed explanation-2: -Water’s extensive capability to dissolve a variety of molecules has earned it the designation of “universal solvent, ” and it is this ability that makes water such an invaluable life-sustaining force. On a biological level, water’s role as a solvent helps cells transport and use substances like oxygen or nutrients.

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.

Detailed explanation-4: -Physical properties of water Water is a colourless and tasteless liquid. The molecules of water have extensive hydrogen bonds resulting in unusual properties in the condensed form. This also leads to high melting and boiling points.

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