All cakes should be refeidgerated eventually. None should be left out for mroe than a few hours, less if they are in heat or direct sunlight.
No refrigerating a cake will not make it dry. However, the cake must be properly covered, or it will get dry whether or not it is refrigerated.
No
Buttermilk has a different acidity than whole milk. If used in a cake mix that calls for whole or 2% milk, a teaspoon of baking soda should be added to balance the acid in the buttermilk.
one is heavier than the other
You can substitute buttermilk as a nice, tasty alternative. So is mayonnaise.
Your cake does not have to be fully cooled to store it. Make sure you wrap it well, and you can leave it on the counter or place it in the fridge.
The cake won't come out properly. However, for every cup of buttermilk in your recipe, put 1 tablespoon of vinegar in a measuring cup, and then pour milk in the cup until you have a total of 1 cup of liquid.
Buttermilk is actually an acid base. (vinegar+milk). If you use them interchangeably you may create an awesome science experiment (baking soda/powder) but not a Yummy cake!
It can be done, but it's not the best. The texture will be different, and the taste will be extremely off.
The cake will be very dry and will crumble and fall apart after baking.
No, your cake will have a strange texture. You can substitute mayo or apple sauce for oil though. You could even use butter, but I am guessing you are trying to get a low fat recipe?
take it out of the oven and leave on a raised surface. leave for as long as it takes to cool down. Ten to 15 minutes should be plenty.