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gladu [14]
3 years ago
5

A student puts a glass of water in the freezer. Later, he notices ice forming on the surface of the water. Which property of wat

er best explains why ice forms on its surface?
A. Ice has more surface tension than liquid water.
B. Ice is less dense than liquid water.
C. Ice has a lower freezing point than liquid water.
D. Ice is more cohesive than liquid water.
E. Ice can dissolve more oxygen than liquid water.
Chemistry
2 answers:
Blababa [14]3 years ago
6 0

Answer: Option (C) is the correct answer.

Explanation:

When a glass of water is held in the refrigerator then kinetic energy of water molecules starts to decrease as there is less temperature in the freezer.

As a result, the water starts to convert into ice because kinetic energy of water molecules converts into potential energy.

Thus, we can conclude that out of the given options, the property ice has a lower freezing point than liquid water best explains why ice forms on its surface.

Karolina [17]3 years ago
4 0
C.ice has a lower freezing point than liquid water

hope this helps
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Answer:

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During preparatory phase glucose is converted into fructose-1,6-bisphosphate. Till this time the carbon numbering remains the same i.e. if we will label carbon at 6th position of glucose, its position will remian the same in fructose-1,6-bisphosphate that means the labeled carbon will still remain at 6th position.

When fructose-1,6-bisphosphate is further catalyzed with the help of enzyme aldolase it is cleaved into two 3 carbon intermediates which are glyceraldehyde 3-phosphate (GAP) and dihyroxyacetone  phosphate (DHAP).  In this conversion, the first three carbons of fructose-1,6-bisphosphate become carbons of DHAP while the last three carbons of fructose-1,6-bisphosphate will become carbons of GAP. It simply means that GAP will acquire the last carbon of fructose-1,6-bisphosphate which is labeled. Now the last carbon of GAP which has phosphate will be labeled.  

<u>(2) Pay-off phase</u>

During this phase, GAP is dehydrogenated into 1,3-bisphosphoglycerate (BPG) with the help of enzyme glyceraldehyde 3-phosphate dehydrogenase. This oxidation is coupled to phosphorylation of C1 of GAP and this is the reason why 1,3-bisphosphoglycerate has phosphates at 2 positions i.e. at position 1 in which phosphate is newly added and position 3rd which already had labeled carbon.

It is pertinent to mention here that<u> BPG has a mixed anhydride and the bond at C1 is a very high energy bond.</u> In the next step, this high energy bond is hydrolyzed into a carboxylic acid with the help of enzyme phosphoglycerate kinase and the final product is 3-phosphoglycerate. Hence, the carbon with low energy phosphate i.e. the carbon at 3rd position remains labeled.

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3 years ago
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3 years ago
a 6.7 volume of air, initially at 23 degrees celsius and .98 atm, is compressed to 2.7 L while heated to 125 degrees celsius. Wh
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Data:

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Answer:

True

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