What happens when potassium reacts with fluorine to produce potassium fluoride

What is the independent variable in this investigation? mass volume sample number substance density

Based on its chemical properties, identify the position of each chemical family on the periodic table.

When a chemist collects hydrogen gas over water, she ends up with a mixture of hydrogen and water vapor in her collecting bottle. if the pressure in the collecting bottle is 97.1 kilopascals and the vapor pressure of the water is 3.2 kilopascals, what is the partial pressure of the hydrogen?