Is this investigation a controlled experiment or an observational study? Explain your answer

If you open the bottle of perfume then nothing but the smell will come out of it and yes it is a type of gas smell because it’s say it in english so i can understand better and you

Neither model is able to show the reactivity of potassium.

Reaction type : double replacement hcl + lioh = h2o + licl

Answersublimation;