Black.
Black.
Black.
Black.
Black.
metal
Potassium although sometimes it can look purple
Cobalt is a silvery gray metal. A link is provided.
Potassium permanganate is colored because it absorbs light in the visible range of the electromagnetic spectrum. The permanganate ion is the source of the color, as a ligand-to-metal charge transfer takes place between the oxygen's p orbitals and the empty d-orbitals on the metal. This charge transfer takes place when a photon of light is absorbed, which leads to the purple color of the compound.
The only [element I know of that's purple in its elemental form is iodine. Transition metal ions can be purple as well (for example, Mn +7 is responsible for the color of potassium permanganate).
Iodine is a purple-black non metal that changes to a deep purple gas when heated.
The metal absorbs the thermal energy before it can build up in the paper enough to ignite. The paper will eventually burn when the metal itself absorbs enough energy to ignite the paper.
It is metal because it absorbs heat and the heat heats up whatever you are cooking
Palladium sheets
since metal is a good conductor of heat, it absorbs the heat and the spoon increases the temperature
Metal absorbs a great deal of heat from the sun. A metal house would quickly turn into an oven inside.
Well, I think metal absorbs the most heat. As, it is the best conductor of heat hope this helps a little! :D