Which of the following is a physical change? Sugar dissolving in water

Milk souring

Metal rusting

Paper burning in a fire

sugar dissolving in water

Explanation:

at the end mixing 2 substances and not get a new substance is not a chemical change. the sugar is still sugar even when its in water.

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

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