Describe why the formation of sand is a physical change

Most of the sand is made up of loose grains and tiny pieces of worn out and disintegrated rocks. This physical break down of different rocks is termed as weathering.

A physical change happens when the physical form of a substance is altered but it does not transform it into another substance.

Therefore, the formation of sand is only a physical change, and not chemical, because weathering only changes the size of loose fragments of rock that make up the sand.

93.2 ml + 3920 ml = 4013 ml total  

(93.2 ml) * (2.03 m) / (4013 ml) = 0.0471 m

the volume in in l of the diluted solution would be 0.0471 m.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate