Confusing Dr. Collins Answers

[PoopsMagee]

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So after going through the Dr. Collins review material, I've noticed a few things:

1. It seems to be a much more manageable and relevant set of materials than Kaplan.

2. The emphasis on numerous practice tests seems to equal much more retained information than just reading the facts/materials.

3. It desperately needs a proofreader, as there are countless typos, misspellings, and seemingly wrong answers provided that slightly detract from the overall credibility

After coming across a few questions with strange answers, I decided the best place to clear things up would be here, since everyone seems to be so helpful and knowledgeable on the various subjects. I'll just post this one strange question/answer for now, but will be coming back with others that I found puzzling if I still can't figure them out.

My first hurdle is a question that goes like this:
Q: Solution I: pH=2, Solution II: pH=7, Solution III: pH=10.
Which of the above solutions would turn blue litmus red?

A) I B) II C) III D) I and II

Now A is the correct answer, and this was the answer I chose (despite being slightly tempted by D...). However in the explanation for the solutions there is a single sentence that says: "both I and II are acidic"

ooookay.... So is this a typo? While I'm aware that pH of 7 is neutral, would it still turn blue litmus paper red? I know this is a tiny detail but it's really been bugging me

Any help would be appreciated!

 

[harmonidrum]

So after going through the Dr. Collins review material, I've noticed a few things:

1. It seems to be a much more manageable and relevant set of materials than Kaplan.

2. The emphasis on numerous practice tests seems to equal much more retained information than just reading the facts/materials.

3. It desperately needs a proofreader, as there are countless typos, misspellings, and seemingly wrong answers provided that slightly detract from the overall credibility

After coming across a few questions with strange answers, I decided the best place to clear things up would be here, since everyone seems to be so helpful and knowledgeable on the various subjects. I'll just post this one strange question/answer for now, but will be coming back with others that I found puzzling if I still can't figure them out.

My first hurdle is a question that goes like this:
Q: Solution I: pH=2, Solution II: pH=7, Solution III: pH=10.
Which of the above solutions would turn blue litmus red?

A) I B) II C) III D) I and II

Now A is the correct answer, and this was the answer I chose (despite being slightly tempted by D...). However in the explanation for the solutions there is a single sentence that says: "both I and II are acidic"

ooookay.... So is this a typo? While I'm aware that pH of 7 is neutral, would it still turn blue litmus paper red? I know this is a tiny detail but it's really been bugging me

Any help would be appreciated!

No, the color change only occurs under a pH of 4.5.

 

[Bigj5768]

So after going through the Dr. Collins review material, I've noticed a few things:

1. It seems to be a much more manageable and relevant set of materials than Kaplan.

2. The emphasis on numerous practice tests seems to equal much more retained information than just reading the facts/materials.

3. It desperately needs a proofreader, as there are countless typos, misspellings, and seemingly wrong answers provided that slightly detract from the overall credibility

After coming across a few questions with strange answers, I decided the best place to clear things up would be here, since everyone seems to be so helpful and knowledgeable on the various subjects. I'll just post this one strange question/answer for now, but will be coming back with others that I found puzzling if I still can't figure them out.

My first hurdle is a question that goes like this:
Q: Solution I: pH=2, Solution II: pH=7, Solution III: pH=10.
Which of the above solutions would turn blue litmus red?

A) I B) II C) III D) I and II

Now A is the correct answer, and this was the answer I chose (despite being slightly tempted by D...). However in the explanation for the solutions there is a single sentence that says: "both I and II are acidic"

ooookay.... So is this a typo? While I'm aware that pH of 7 is neutral, would it still turn blue litmus paper red? I know this is a tiny detail but it's really been bugging me

Any help would be appreciated!

pH of 7 is definitely neutral. It is 1. how did you get your Dr. Collins material?

 

[PoopsMagee]

Thanks harmonidrum that's exactly what I was lookin for! 👍

I ordered these straight from pcatprepclass.com bigj. I wanted to be sure they were the up to date questions since I kinda only have one shot at it.

So since you guys were so helpful, I've got another question about one of the problems:

Q: For a gas in a closed container its pressure is found to be 400 N/m^2 at 27 degrees C. If the temperature were raised to 54 degrees C, what would the pressure become?

A) 800 N/m^2 B) 436 N/m^2 C) 200 N/m^2 D) 427 N/m^2

The answer key says the correct answer is B.... This has got to be a typo right? I worked it out twice using P1/T1 = P2/T2 and came up with 800 N/m^2 both times.... Am I using the wrong formula or am I completely missing something?

Thanks again!

 

[gotgame740]

I'm pretty sure you have to use Kelvin for your temperature calculations

 

[PoopsMagee]

WOW^^ Don't I feel stupid! and with good reason!

Thanks for the help gotgame! I'm sure it was hard to respond to with a straight face it seems painfully obvious now.

No dumb questions right? Just dumb people 😀

 

[simplyme01]

I was wondering the same thing but I will now remember to convert to kelvin first so thank u!

 

[PoopsMagee]

^^^ That's great I'm glad I wasn't the only one 🙂

So, moving right along...

Q: Element Atomic # Mass #
.......a.........17...........35
........b.........6............14
........c.........17..........35
........d..........7...........14

Which two of the above elements are isotopes?

A) b + d B) a + c C) a + b D) c + d


The answer provided is B, which is elements a & c.

I was under the impression that isotopes are atoms with the same number of protons but different numbers of neutrons, hence different mass numbers... is it possible one of those Mass #s was supposed to be 34 or 36, or will a question like this actually show up on the PCAT and just expect you to choose the "most correct" answer? (meaning the elements with the same number of protons)

Thanks as always 😎

 

[Pharmrx12]

Could they (a & c) be considered isotopes with different charges for the same element? Although the charge would change the number of electrons! It may just be a trick question.

 

[PoopsMagee]

Could they (a & c) be considered isotopes with different charges for the same element? Although the charge would change the number of electrons! It may just be a trick question.

Hmm that's a good call I hadn't thought about that. I'm sure you're right it wouldn't be the first time one of these questions had been unnecessarily tricky.
Thanks!

 

[gotgame740]

WOW^^ Don't I feel stupid! and with good reason!

Thanks for the help gotgame! I'm sure it was hard to respond to with a straight face it seems painfully obvious now.

No dumb questions right? Just dumb people 😀

we all make mistakes

I was wondering the same thing but I will now remember to convert to kelvin first so thank u!

no problem!

 

[CR9]

nvm i forgot to convert it to kelvin

 

[JonPrePharmD]

^^^ That's great I'm glad I wasn't the only one 🙂

So, moving right along...

Q: Element Atomic # Mass #
.......a.........17...........35
........b.........6............14
........c.........17..........35
........d..........7...........14

Which two of the above elements are isotopes?

A) b + d B) a + c C) a + b D) c + d


The answer provided is B, which is elements a & c.

I was under the impression that isotopes are atoms with the same number of protons but different numbers of neutrons, hence different mass numbers... is it possible one of those Mass #s was supposed to be 34 or 36, or will a question like this actually show up on the PCAT and just expect you to choose the "most correct" answer? (meaning the elements with the same number of protons)

Thanks as always 😎

Same # protons, Same # electrons, thus same atomic #.

Mass number must change due to an addition or subtraction of neutrons forming an isotope.

I noticed that question as well...Many typos throughout his stuff but I can assure you it is a fraction of how many are in kaplan books.