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On page 320 of the textbook it says, "A Note on Good Practice: Note the sign on the answer; always show the sign explicitly for the change in a quantity, even if it is positive." You wouldn't get marked wrong if you didn't have the positive sign though.
This would especially help when applying Le Chatelier's Principle as exothermic and endothermic reactions can shift the equilibrium of a system as well as in Electrochemistry where voltage of a battery should always be positive (it would be a good way to double check that you identified the correct cathode or anode). So as stated above, it would generally be very useful to use the (+) to indicate heat/energy loss or heat/energy gained so that it is more explicit.
204918982 wrote:So should we always put a + sign on positive answers for change calculations on tests/exams?
I would say yes, since the examples we have done in class and the solutions in the manual all include the + sign for positive answers.
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