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TLS Online TPP Program

#Question id: 12807

If Earth's axis of rotation suddenly became perpendicular to the plane of its orbit, the most predictable effect would be

#Unit 10. Ecological Principles
  1. No more night and day. 
  2. A big change in the length of the year.
  3. A cooling of the equator.
  4. A loss of seasonal variation at high latitudes.
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TLS Online TPP Program

#Question id: 373

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the hydroxyl ion (OH-) concentration of a solution of pH 8?
TLS Online TPP Program

#Question id: 374

#Unit 1. Molecules and their Interaction Relevant to Biology

The pH of a sample of blood is 7.4, while gastric juice is pH 1.4.  The blood sample has:
TLS Online TPP Program

#Question id: 375

#Unit 1. Molecules and their Interaction Relevant to Biology

The aqueous solution with the lowest pH is:
TLS Online TPP Program

#Question id: 376

#Unit 1. Molecules and their Interaction Relevant to Biology

Phosphoric acid is tribasic, with pKa of 2.14, 6.86 and 12.4. The ionic form that predominates at pH 3.2 is
TLS Online TPP Program

#Question id: 377

#Unit 1. Molecules and their Interaction Relevant to Biology

The aqueous solution with the highest pH is:
TLS Online TPP Program

#Question id: 378

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statements about buffers is true?