AP BIOLOGY

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BIOCHEMISTRY

PROPERTIES OF WATER

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Maria, after finding no cold sodas in the refrigerator, placed a can of soda in the freezer. She then proceeded to check her social networking site and forgot about the soda. Later that evening her brother went to get some ice and it was brown. Maria’s soda can had split open. What is the best explanation for what happened?
A
As the water cooled, it adhered to the can, causing it to split
B
When the water froze, the space between hydrogen molecules expanded
C
When the water froze, it weakened the molecular bonds in the aluminum can
D
As the water cooled, the surface tension of the water decreased and the can collapsed
Explanation: 

Detailed explanation-1: -What do you predict might happen if water had a low specific heat instead? A. Flooding would occur and animals would be forced to migrate.

Detailed explanation-2: -Finally, the high specific heat of water makes it resistant to temperature change, allowing life forms to maintain relatively constant internal temperatures. The high specific heat and surface tension of water contribute to its high boiling point, helping to keep it in liquid form for most biological processes.

Detailed explanation-3: -The transparency of water is important for organisms that live in water. Because water is transparent, sunlight can pass through it. Sunlight is needed by water plants and other water organisms for photosynthesis.

Detailed explanation-4: -Water has a high specific heat capacity-it absorbs a lot of heat before it begins to get hot. You may not know how that affects you, but the specific heat of water has a huge role to play in the Earth’s climate and helps determine the habitability of many places around the globe.

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