I would like to help but what are the solutions?
Answer:
You should not use an open flame to heat the solvent and the solvent should be heat in a stoppered flask to vapour away from the open flame
Explanation:
Control is something that remains the same or constant through an experiment. And an experiment group is the group you test the one change on. (Also called the dependent variable)
Answer: Tungsten. This requires a lot of energy. Molecules are held together by covalent bonds, which are strong.
