Because the mix together evenly and no lumps.
Using a sifter when baking helps the flour become more lightly distributed through out the batter so it does not get clumped up when mixing it together.
nope
Actually, unbleached flour is what you buy.Unsifted means that you don't need to sift the flour. Some recipes call for sifted flour, some don't say to do anything - that would be unsifted.
That depends on what kind of cake your baking. . .
Self raising flour makes the cake rise, but if you don't have any you can use plain flour and baking powder which has the same effect. 225g plain flour and 4 teaspoons baking powder, will transform it into self raising flour.
Yes, beautifully too. You can use a flour sifter, or a basket strainer with a handle, these are both smaller in size. Put your confectioner (powdered) sugar into this, hold over the cake and gently sift the sifter or shake the basket strainer around it. MAKE SURE YOUR CAKE IS COMPLETELY COOLED. Very important. Or it melts like snow flakes.
Follow the recipe for the amount of baking powder to use whether your using regular flour or cake flour. Neither of them have baking powder, unless it is "self rising" which means leavening is included.
you add 1 teaspoon of baking powder to every cup of plain flour
Not every recipe calls for baking soda, but for the ones that do it interacts with the flour to rise and expand the cookies or cake.
No. Self raising flour already has baking soda mixed into it (which is another leavening agent used in cake baking)
Bisquick contains baking soda and baking powder, so no. Also, the gluten level is different in cake flour compared to the flour used in bisquick.
Whole meal can be used in cake baking. But it produces a heaver, less tender cake than white cake flour.
Generally you can, yes.