Cutting, melting, bending, or crushing are examples of what kind of change?

those are all physical changes and most physical changes can be undone like crushing a pice of metal you can flatten it back out you anwser is physical change

Explanation:

It is a physical change because it can be reversed back and no new subtances is dormed.

answer; ///(u-235); ///is the correct

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally