Black powder
Carbon
Black powder is a compound composed of potassium nitrate, sulfur, and charcoal. It is not an element because it is made up of multiple atoms of different elements chemically bonded together.
Black powder is a mixture, not an element. It consists of potassium nitrate, charcoal and sulfur in the ratio 75:15:10. It is used in fireworks and was once used to propel bullets in guns(still used with some antique guns).
Sulfur powder is an element.
Boron is typically found in an amorphous brown or black powder form. It does not have a distinct color in its natural state.
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The element you are referring to is iodine. In its solid form, iodine appears as a hard, black, shiny material. When heated, it sublimes directly from a solid to a gas, turning into a brownish-purple vapor. As the vapor cools, it forms brownish powder deposits.
Sulfur is an element.
Manganese dioxide (MnO2) is a black powder.
Black powder absorbs moisture from the atmosphere
Bonding powder is not a chemical element.