Question

What makes elements and compounds different from mixtures? Elements and compounds-

a). have a constant composition
b). are made of gases
c). will not change when heated
d). conduct electric current

Answer 1

a). have a constant composition

Step-by-step explanation:

Let's take water, a compound, as an example. Regardless of how much water you have, there will be one oxygen molecule every two hydrogen molecules. It has a constant composition. The same case is with elements. You'll have a constant amount of atoms per mole. Meanwhile, in mixtures, the composition of everything mixed together is not constant as it is not equal everytime.

Besides, the rest of the choices do not even make sense in the first place...