Physical change is changing physically it eg appearance while chemical change is the molecular bonds water is always defined as H2O and not change chemically. Hope this answers your question.
the machine shown in the diagram is called a tramp.
the height of the tramp is 5 and the length is 12
Avogadro's number: 6.02 x 10^23 atoms is present in 1mol of a solid (i.e. 22, 400 cm3)
Hence, in 1 cm3, 6.02 x 10^23 /22400 atoms is present = 2 x 10 ^ 19 atoms.
I believe it would be D a change in direction of motion
<span>Density is entirely unrelated to an object's size. It is a property of a given</span>
