A student recently asked us why we don't take into account NaI dissolving into Na+ and I- when calculating molality, which is a great question! NaI is indeed a soluble compound, but the trick is not to confuse molality with normality. Molality is defined as the number of moles of the entire compound...

A student recently asked us about the solution to the following question: "A certain theater has an equal number of blue and yellow lights. One of the star performers provides the lighting crew with lighting specifications for a performance. For the opening act, the performer wants 40% of the blue l...

A student recently asked us about how NS PCAT exams are scored. Since every exam is unique, every Pearson and Next Step PCAT exam has a unique scoring scale tailored to student performance on that exam. The Next Step scoring scales were developed based on the distribution of student scores on each e...

murphyrachel63, that's a great question. You should assume that most chemistry equations and formulas will not be provided for you on the test, so it's a good idea to start committing them to memory. Rather than try to memorize them by brute force, however, I recommend using these equations as much ...

Hi Rachel, I'm glad you've asked! To review this set, you will need to submit the QBank after you have completed the number of questions you wish to answer. I recommend not looking at the solutions for the unanswered questions, and then you can take the remaining questions on a new "attempt" wheneve...

A student recently asked us about the statement, "The document was also subject to internal and external peer reviews" in paragraph 4. This refers to the review process for the international guidelines on tularemia, both internally within the development group, and externally outside this group. Whi...

A student recently asked us if the Next Step PCAT exams vary or progress in difficulty. This is a great question, and it's one we get asked a lot! All of the Next Step PCAT exams are designed to be representative of the official PCAT in terms of content, difficulty, and scoring, so the exams should ...

A student recently asked us how to determine the reaction rate for the following question: "Which of the following is the rate constant for Reaction 2?" To answer this question, we have to turn to Table 1 presented in the passage, which presents the reaction rate at different concentrations of O2 an...

Meiosis:

A student recently asked us this question about mitosis and meiosis: "During mitosis, the number of chromosomes stays the same, but the number of sister chromatids changes. So when we say we have 46 chromosomes, does that mean there are about 92 sister chromatids (after S phase and before anaphase)?...