Yes, grind well in a blender. Double check your measurements after you do.
Granulated sugar shouldn't be used as a substitute where powdered sugar is specified in a recipe; granulated sugar will be too coarse.
yes yes
You should be able to substitute granulated sugar doe castor sugar without any significant detriment to the resulting product.
Most sugar bought for home use is granulated, so it pours freely. Therefore, it will fill a jar and take on the shape of the jar. Sugar cubes are solid cubes, so there will be a lot of spaces between the solid cubes.
Confectioner's Sugar (powdered sugar) has a completely different consistency and quality than granulated sugar. You cannot substitute one for the other.
rwgular sugar is granulated sugar. the other kind is confectioner's sugar, or powdered sugar
Caster sugar has finer granules than regular (or "granulated") sugar. For cupcakes, you should be able to use regular sugar instead of castor without any detriment to the final product.
If you don't mind having crunchy icing.
You use granulated sugar unless otherwise noted.
it is better to use sugar cubes
Yes, you can use caster sugar instead of granulated sugar. However, be careful on the measurements. Use a little less caster sugar. Caster sugar is finer granulated sugar. It is not as fine as powdered sugar, but it is in between granulated and powder. Caster sugar dissolves more easily,so it is very beneficial in making meringues.
Yes you can but you may be comrpromising flavour depending on what your are making.