Nextstep diagnostic #1 C/P

[akimhaneul]

For this question, I am guessing that no matter what the drug to polymer ratio is, the lag floating time can solely be determined by density of the polymer? Can anyone explain why this is the case? thanks!

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[wizzed101]

According to the passage, the key factor to increase floating time is the amount of air trapped in micro-pores/volume. I assume that the amount of air trapped is proportional to the amount of polymer added, which might be very wrong because polymers have many different nano structures.

............and you don't have that information: need molecular weight/ info about how the polymers trap air in the first place.

I don't think the writer of the test knows what he/she is talking about.

 

[akimhaneul]

According to the passage, the key factor to increase floating time is the amount of air trapped in micro-pores/volume. I assume that the amount of air trapped is proportional to the amount of polymer added, which might be very wrong because polymers have many different nano structures.

............and you don't have that information: need molecular weight/ info about how the polymers trap air in the first place.

I don't think the writer of the test knows what he/she is talking about.

Why would you need the molecular weight info? Can't you just use density to solve this problem?

Here is the rest of the passage..not sure if it helps.

Thanks for your help!!

 

[wizzed101]

This is why:

Substance A has a density of 0.3 g/ml. How many moles of A contain within 1 ml of A?

And yes the additional info help! I didn't know what the heck "floating lag times" was and just assumed it was the time the tablet floated in the stomach. Apparently, I was wrong.

Nevertheless, let just assume that the ratios they mentioned are "amount" ratio. According to the table, trial 1 has the least amount of polymer and 3 the most. As per my previous comment, trial 3 should trap the most air and thus will rise the surface the fastest, and trial 1 the slowest of the 3.