Balance the following chemical equation: BF3(s)+Li2SO3(s)—> LiF(s)+B2(SO3)3(s)

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution?

Do polar molecules have ionic bonds?