Question

Which of the following is a physical observation?

a)Burns in oxygen temperature
b)melts at 76C
c)forms a white precipitate
d)decomposes in air e)cooks at high

Answer 1

A physical observation refers to something that can be directly observed or measured without changing the substance being observed.Option (b),'melts at 76C', is an example of a physical observation.

Step-by-step explanation:

A physical observation refers to something that can be directly observed or measured without changing the substance being observed. Option (b), 'melts at 76C', is an example of a physical observation because it describes a change in state (solid to liquid) at a specific temperature. The other options, (a) burns in oxygen temperature, (c) forms a white precipitate, (d) decomposes in air, and (e) cooks at high, describe chemical reactions or processes, which are not considered physical observations.