Self-rising Flour
yes enriched flour can be substituted for all purpose flour in a cake
yes
In general, yes.
That is approximately 8 cups of flour.
All-purpose flour can be used as a substitute for cornstarch.
yes
yes
yes. They are the same thing. Plain flour is an Australian term where all-purpose is the American.
the difference between the two are that self rising has yeast in it. so all you have to do is get some yeast and mix it with the flour.
yes you can adjust the water
Yes :)