Recent content by drtg45

That's what I'm talking about, plugging the values before we get to make the mistake and change the direction in the inequality sign.

That would require foreshadowing of the values of the variables, which means constantly looking back and forth at the known data which in my opinion can be distracting (at least for me) when your mind is working on a different qualitative realm (imagining atoms bouncing around, atomic bonds...

Hey thanks for your reply, I just finished posting something about inequalities in the General Math section, it would be great if you could check it out: https://www.physicsforums.com/showthread.php?t=627753 maybe by doing what I describe in there the problems brought about by the minus...

So I was brainstorming:bugeye: trying to find what I did wrong in this chemistry problem: https://www.physicsforums.com/showthread.php?t=627731 (simple algebra no chemistry knowledge required) And I noticed something peculiar about the process of solving inequalities, let me sum up in a phrase...

For a chemical reaction we have, ΔH=-114.1kJ and ΔS=-146.4J/K ---> ΔS=-146.4·10^{-3}kJ/K. Question: Determine the temperature range at which the reaction is spontaneous. A reaction is spontaneous when ΔG is negative in the equation ΔG=ΔH-TΔS, so I do: ΔG=ΔH-TΔS 0>ΔH-TΔS -ΔH>-TΔS...