Can somebody name this solid for me???

Question

Yellow sold burns in oxygen with a bright blue flame, producing a misty gas. Gas is soluble in water, and the solution turns indicator red.
What is the solid?
What is the gas created?
Thanks soo much - I have no idea :S
x

Answer 1

Well, it is sulphur. It is yellow at room temperature. Reacting with oxygen produces sulphur dioxide, never sulphur trioxide! SO3 is produced very hardly in factories. SO2 is soluble in water, creating sulfurous acid (H2SO3). You realise it is a nonmetal because if it tuns indicator red, it means that the substance formed by dissolving is an acid (otherwise, it would have been a base).
Good Luck! Louise

Answer 2

When you burn something in oxygen, you are producing the oxide of the original element. Metal oxides are generally solids and when dissolved in water produce a basic solution. Nonmetal oxides are usually gases and when dissolved in water produce acidic solutions.

So, your substance is a nonmetal. Of the nonmetals that are solids, there is only one common one which is a yellow solid, and that is Sulfur. The gas produced is probably sulfur dioxide (SO2) or sulfur trioxide (SO3).