Question 7 The chemical equation below shows what happens when methane and oxygen react to form carbon dioxide and water.
CH4 + 202 - CO2 + 2H20
Using the chemical equation, how many elements are involved in this chemical reaction?

High-pressure liquid chromatography (hplc) is a method used in chemistry and biochemistry to purify chemical substances. the pressures used in this procedure range from around 500 kilopascals (500,000 pa) to about 60,000 kpa (60,000,000 pa). it is often convenient to know the pressure in torr. if an hplc procedure is running at a pressure of 1.03×108 pa , what is its running pressure in torr?