Which cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting?
A. a crystalline solid
B. a sublimation
C. a pure substance
D. an amorphous solid
I think it is A am I right?
anyone?
I don't think it's A.
A is incorrect. Please re-read this question carefully and when you're done, please try again.
what is the correct answer then?????
You are partially correct. Option A, a crystalline solid, cannot be separated into simpler substances by physical or mechanical methods. However, there is another correct answer. The correct answer is C, a pure substance. A pure substance, which includes elements and compounds, cannot be separated into simpler substances by physical or mechanical methods like filtering, boiling, or sifting.
Option B, a sublimation, is a process in which a substance transitions directly from a solid to a gas state without going through the liquid state. Sublimation is not a substance itself, so it is not the correct answer.
Option D, an amorphous solid, can be separated into simpler substances by physical or mechanical methods. Although amorphous solids have a disordered atomic arrangement, they can still be separated by methods like filtration or distillation.