Indications

[Courtney McHargue 1I]

Are there any characteristics of a reaction that would hint at the value of delta G being positive/negative or larger/smaller?

[Jessica Chen 1F]

Since the equation to calculate for delta G is delta G = delta H - T(delta S), a small/negative delta H (enthalpy), large/positive T (temperature), and a large/positive S (entropy) would make for a very small/negative delta G.
The opposites would make delta G larger (more nonspontaneous).

[megan blatt 2B]

If a reaction is spontaneous, then delta G is negative. A very negative change in enthalpy (exothermic reaction) will likely cause delta G to be negative. A very positive change in entropy would likely also make delta G negative. Like the previous comment said, the opposite would then make delta G more positive and not spontaneous.

[Emily Kennedy 4L]

if you look in the txtbook there is a chart that does a good job of outlining this