Which uses of iron are due to its chemical properties? Select two options.

producing colored sparks in fireworks
changing from liquid to gas at 2,862°C
rusting in the presence of water and oxygen
changing from solid to liquid if heated to 1,538°C
conducting electricity and heat

List four observations that indicate that a chemical reaction may be taking place

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

What can be found in the ionosphere