How is the scientific method similar to or different from superstition, guessing, intuition, hope?

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?