A student sees tiny bubbles clinging to the inside of an unopened plastic bottle
ID: 535299 • Letter: A
Question
A student sees tiny bubbles clinging to the inside of an unopened plastic bottle full of carbonated soft drink. The student opens the bottle, and hears a loud hiss as gas under pressure escapes from the bottle. Rock candy is formed when excess sugar is dissolved in hot water followed by crystallization. A student wants to make two batches of rock candy. He finds an unopened box of "cane sugar" in the pantry. He starts preparing batch A by dissolving sugar in 500 mL of hot water(70 degree C). He keeps adding sugar dissolves in the hot water. He cools the solution to room temperature. He prepares batch B by dissolving sugar in 500 mL of water at room temperature until no more sugar in 500 mL of water at room temperature until no more sugar is dissolved. He lets the solution sit at room temperature. The bubbles will shrink, and some may vanish. The bubbles will grown, and more may appear. The bubbles wont change. I need more information to predict what will happen to the bubbles. It is likely that more rock candy will be formed in batch A. It is likely that less rock candy will be formed in batch A. It is likely that no rock candy will be formed in either batch. I need more information to predict which batch is more likely to form rock candy.Explanation / Answer
The first part answer is B. The bubbles will grow, and more may appear .
Bubbles in the bottle indicate the presence of vaccum at that particular place . Since the aerated carbonated drinks are packaged under high pressure, the opening of bottle will release pressure and the gas escapes out of the fluid leaving empty spaces/ vaccum , due to which more bubbles will be seen , which will then eventually settle down .
The second part answer is A. More rock candy will be formed in batch A.
Since the batch A was formed by taking the hot water , more sugar must have dissolved into it as compared to the water at room temperature . The dissolution / solubility increases on increase in temperature. So more recrystallisation will occur in batch A , hence more rock candy.
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