Yes it could but it depends how old it is. But you shouldn't eat anything that is old.
It is cocoa beans that have been harvested and roasted and then ground into a very thin, pure powder called cocoa powder. It is almost always unsweetened.
It's very doubtful it will make you sick. However, the baking powder will be useless in the recipe if it has reached (or surpassed) the expiration date.
There is no need to freeze cocoa powder; it will keep for a very long time in a tightly covered tin.
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).
it smells very weird
You cannot; they are very different things. Cocoa butter is a pure solid fat, not unlike unfractionated coconut oil. It is the primary constituent of (good) white chocolate (along with sugar). Cocoa butter is not at all chocolatey in taste; it's white in colour and commonly used in moisturisers. Cocoa powder is the chocolate part of the cocoa bean, usually used for baking. Cocoa powder and cocoa butter both have very different properties and uses; they are not interchangeable.
yes eat a lot of them and you will be very healthy
If you mean the packages of cocoa that is made for hot chocolate, no. If you mean the brown cocoa powder made by Hershey's, yes. You have to add more sugar because it's very bitter.
It is very simple to make an at home hot chocolate mix. One would need to add sugar, cocoa powder, water and milk to a mug. The solution has to be warmed and hot chocolate is prepared.
Not necessarily. White Chocolate is made by using cocoa butter but not the cocoa solids. There is milk in it, but more sugar is added to make up the bulk. Dark chocolate can be either milk chocolate (chocolate made with milk, but with cocoa solids as well as cocoa butter) or plain chcocolate (chocolate made with cocoa solids and cocoa butter but without milk). If you add white chocolate to milk chocolate then the result will be a very sweet milk chocolate. If you add white chocolate to plain chocolate, the result will be a milk chocolate
Cocoa beans and coffee beans are two totally different products. They are used to make two very different foods (chocolate and coffee), look different, are grown / harvested diffeernt, taste, and smell different.
YES