Mention any two uses of oxygen gas.​

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Reaction rate depends on how many molecules are coming into contact with each other with enough energy to react. increasing the temperature of the reactants will increase -

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?