Asample that cannot be seperated into 2 or more substances by physical means is

The answer is a pure substance.

Pure substance can also be divided into compounds or elements, they both cannot be separated by physical methods. And elements, cannot be further separated by chemical methods. Physical methods may include distillation, crystallization, evaporation etc.

Compunds are made up of 2 or more elements chemically combined together, though it can be separated using chemical methods such as heat or electricity.

But as these both compounds and elements cannot be separated by physical methods, they're called pure substance. Unlike mixtures, which can be separated using physical methods.

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i

Maybe you should get some from your teacher and learn more so you can get your grades up and maybe study a bit more