SCIENCE
Pure Substance
Which statement is correct about pure substances?
A. Compounds are easily distinguishable.
B. Elements are commonly found in nature.
C. Compounds are always composed.
D. Pure substances always form two or more phases.
ANSWER:
C. Compounds are always composed.
Statement A is obviously false. Not all compounds are easy to distinguish, like methane, that is only visible through infrared camera.
Statement B is false, as well. Technetium (Tc | 43) is a synthesized element, that is absent on Earth's environment, as human did this element.
Statement C is correct, because compounds are truly being composed or made by mixing different elements.
Statement D can be true, but actually false, because pure substances doesn't have no phases at all.
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