A student investigates the nature of an unknown substance. He decided to heat up a sample of a blue-green powder and eventually it turned into a colorless gas and a black solid. All these materials are substances. What was the nature of the original substance?
A. Mixture, because it is homogenous.
B. Mixture, because the material contains two or more substance.
C. Compound, because heating the sample produced two different substances.
D. Element, because the original sample can be further divided into simpler substance.
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ANSWER: A. Mixture, because it is homogeneous
EXPLANATION: