Only after a serious analysis (chemical and physical) of the powder.
I think it could be Barium sulphate if its a powder
Manganese dioxide (MnO2) is a black powder.
Yes
No, it is a mixture.
A green powder is likely a mixture if it is composed of different substances that can be physically separated. If the powder has a uniform composition and cannot be separated into different components by physical means, it is likely a compound. Chemical analysis and tests can also help determine if the green powder is a compound or mixture.
Sulfur is an element.
Chili powder is amixture not a compound; the principal ingredient is capsaicin.
A mixture.
It is, it's sodium bicarbonate
Yes, the word milk powder is a compound noun, but it is a separated compound noun.A separated compound can be hyphened when used to describe another noun (a noun as an adjective called an attributive noun). Examples:Please pick up a package of milk powder.The milk-powder granules are in big clumps.
Talcum powder is covalent. It is composed of metals AND non-metals, which makes it covalent.
Sulfur is an element.