D is the only choice here that is appropriate given neutrons' lack of charge
Because if you have a liquid then you need a glass to keep it together and when it is a solid it is already together so you don't need to do anything
The number is 25. The square root of 25 is 5 and 5x2 is 10 and then 10+5 is 15
First, you mix the salt and sand with water, so the salt dissolves. Next, you filter the sand out, so you have the slat water and sand separated. Then, you evaporate the water, leaving the salt behind.
