Definition. Moyamoya is the Japanese word for âpuff of smokeâ, which is how the tangled blood vessels caused by the blocked arteries at the base of the brain appear on angiography.Moyamoya disease is a rare, progressive cerebrovascular disorder that generally affects children, although it can affect adults.oyamoya is the Japanese word for âpuff of smokeâ, which is how the tangled blood vessels caused by the blocked arteries at the base of the brain appear on angiography.
Antimony trisulfide is a gray solid. It reacts with hydrochloric acid to make hydrogen sulfide and an antimony(III) compound. It dissolves in potassium hydroxide. It burns in air to make antimony(III) oxide and sulfur dioxide. It is a reducing agent. Occurrence. Stibnite is the mineral form of antimony trisulfide. Preparation. Antimony trisulfide is made in the laboratory by reacting any antimony(III) compound with hydrogen sulfide. Uses. Antimony trisulfide is used in cosmetics; in this area it is called kohl. It is used in pyrotechnics to make a glitter effect.
Antimony is also what is known as a semimetal, which refers to the way in which it conducts energy â bismuth and arsenic are both semimetals as well. Other metalloids include silicon, germanium, and boron. Ad. Antimony in its stable form is a blue-white metallic element, with an atomic mass of 121.76g/mol. It melts at 1167Â°F (630Â°C) and makes a rather effective semiconductor.