How would you separate salt & sand, taking into account the fact that salt is soluble in water and sand is not?

When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas? c7h16o(g) + o2(g) → co2(g) + h2o(g) -1 -5 -8 -16 -21

When the volume and number of particles of a gas are constant which of the following is also constant

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?