how can you tell by hitting a body with a plastic rod if it has a crystalline or amorphous composition

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

Cucl2 + 2nano3 cu(no3)2 + 2nacl what is the percent yield of nacl if 31.0 g of cucl2 reacts with excess nano3 to produce 21.2 g of nacl? 49.7% 58.4% 63.6% 78.7%

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.