Luminol is used in a preliminary test for ___?

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

Margaret wants to make an orange flavored drink by stirring powdered drink mix into a glass of water. she doesn't like drinks that have small clumps of powdered solid in them, so she wants the drink to be a perfect solution. what factors should margaret not consider when deciding how much powder to add to her glass of water?

What is the molar mass of a gas that has density of 2.054 g/l