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You use cocoa powder to make brownies.
No.
Cocoa powder can be used on its own to flavor cakes, pies, brownies and cookies. Three tablespoons of cocoa plus 1 tablespoon butter, shortening or oil can be substituted for one square of unsweetened baking chocolate in almost any recipe.
Mealted Chocolate
Baking powder accelerates electrons and cocoa powder slows them
The taste of baking power is a bitter taste not that far from vinegar. Baking powder is an acid, so its sour. I wouldn't recommend tasting it.
Baking soda is required to leaven the baked product. Either baking soda or baking powder would need to be included in the batter regardless of the use of cocoa powder.
Yes . Measurements in baking must be followed very closely.
Usually yes. Some recipes specify "baking" cocoa powder just so that nobody gets confused and uses "drinking chocolate mix" instead (since this contains sugar and milk powder which would throw off the recipe).
Not really. Nescafe is ground coffee powder, not cocoa powder.
See the related link, "Brownie Recipe" below.
Not generally -- because there is unsweetened (baking chocolate). The best thing to substitute is cocoa powder and butter/oil/shortening. For each ounce of baking chocolate substitute 3 tablespoons of cocoa powder and 1 tablespoon of butter (or oil/shortening).