Imagine a chemist is trying to establish whether a piece of rock is from s meteorite

In which phase(s) do the molecules take the shape of the container?

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

When hydrogen peroxide (h2o2) is added to potassium iodide (ki) solution, the hydrogen peroxide decomposes into water (h2o) and oxygen (o2). the chemical equation for the decomposition reaction is: 2h2o2—> 2h2o + o2. what is the role of the potassium iodide in this reaction? a. reactant. b. product. c. precipitate. d. catalyst.